380kV CT-VT calculation_C4_Rev_D 17.12.09
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فرع المنطقة الشرقية
380kV CT/VT SIZING CALCULATION (CROSS BAY C#4)
17.12.2009 D
REVISIONS DRAWN RJP
BY:DATE:-
20.12.08
CHECKED BY:-
JA
DATE:-
22.12.08
OPRG. DEPT BY DATE:-
ENG'G. DEPT. BY:DATE:-
CERTIFIED. BY:DATE:THIS DRAWING IS NOT TO BE USED FOR CONSTRUCTION OF FOR ORDERING MATERIALS UNTIL CERTIFIED AND DATED
AS BUILT BY
DATE DRAWING TITLE
INDEX
380kV CT SIZING CALCULATION ABU-HADRIYAH 380/115kV BSP KHURSANIYAH
A
PLANT
T201
SAUDI ARABIA JOB ORDER NO.
DRAWING NO.
SHEET NO.
REV NO.
EE-086959
01 OF 50
D
3-083300.01 DWG.CONT.SHT.
EE-086950
SEC-ERB CAD-E (2002/03)
DMS
EXCEL
THIS DRAWING AND THE INFORMATION CONTAINED HEREIN ARE THE SOLE PROPERTY OF SAUDI ELECTRICITY CO. NO REPRODUCTION IN FULL OR IN PART SHALL BE OBTAINED FROM THIS DOCUMENT WITHOUT THE WRITTEN CONSENT OF ITS OWNER.
RJP
JA
RJP
REVISED AS PER SEC COMMENTS DATED 06.12.2009 ON REVISED CT CALCULATION.
25.06.2009 C
PG
الشركة السعودية للكهرباء
Eastern Region Branch
URD
REVISED AS PER SEC COMMENTS DATED 03.06.2009 ON REVISED CT CALCULATION.
JA
CERT'D
RJP
JA
APPR'D CHK'D DESCRIPTION
REVISED AS PER BASE DESIGN REVIEW MEETING DATED 16.03.09 & 17.03.09
BY
PG
DATE
03.04.2009 B
NO.
Saudi Electricity Company
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
INDEX SR. NO.
DESCRIPTION
SHEET NO.
1.0
GENERAL DESIGN CRITERIA FOR CT CALCULATION
1
1.1
SYSTEM DESIGN DATA
1
1.2 1.3 1.3
DESIGN BASIS AND REFERENCES FOR CT CALCULATION
1
CT LEAD RESISTANCE CALCULATION
2
2.0
CT CALCULATION FOR THE FOLLOWING CT's.
3
2.1
CT: 810 B1.C1 :- BF PROTECTION (RAICA)
3
2.2
CT: 810 B1.C2 :- OHL FEEDER SET-1 PROTECTION (REL 531)
5
2.3
CT: 810 B1.C3 :- OHL FEEDER SET-2 PROTECTION (7SA522)
12 16
2.4
CT: 810 B1.C4 :- METERING
14
2.5
CT: 810 F.C3 :- SPARE
15
2.6
CT: 810 F.C2 :- BUS-BAR PROTECTION MAIN-2 (MFAC14)
16
2.7
CT: 810 F.C1 :- BUS-BAR PROTECTION MAIN-1 (MCAG 14)
20
2.8
CT: 811 B1.C1 :- BF PROTECTION (RAICA)
24
2.9
CT: 811 B1.C2 :- OHL FEEDER SET-1 PROTECTION (RED 670)
25
2.10
CT: 811 B1.C3 :- OHL FEEDER SET-2 PROTECTION (MiCOM P546)
31
2.11
CT: 811 B1.C4 :- METERING
34
2.12
CT: 811 B2.C4 :- METERING
35
2.13
CT: 811 B2.C3 :- OHL FEEDER SET-2 PROTECTION (7SA522)
35
2.14
CT: 811 B2.C2 :-OHL FEEDER SET-1 PROTECTION (REL 531)
36
2.15
CT: 811 B2.C1 :- SPARE
36
2.16
CT: 812 F.C1 :- BUS-BAR PROTECTION MAIN-1 (MCAG 14)
37
2.17
CT: 812 F.C2 :- BUS-BAR PROTECTION MAIN-2 (MFAC14)
38
2.18
CT: 812 F.C3 :- SPARE
39
2.19
CT: 812 B2.C4 :- METERING
40
2.20
CT: 812 B2.C3 :- OHL FEEDER SET-2 PROTECTION (7SA522)
40
2.21
CT: 812 B2.C2 :- OHL FEEDER SET-1 PROTECTION (REL 531)
41
2.22
CT: 812 B2.C1 :- BF PROTECTION
41
BAY NUMBER: CROSS BAY C4
ABU-HADRIYAH CONTRACT No. 3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP 3.00
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
LINE VT SIZING CALCULATION
42
BUS-1 VT SIZING CALCULATION
47
BUS-2 VT SIZING CALCULATION
49
ATTACHMENTS: ANNEXURE-1 CT REQUIREMENT OF RELAY ANNEXURE-2 VA REQUIREMENT OF RELAY ANNEXURE-3 SAUDI CABLE CATALOGUE ANNEXURE-4 380kV GIS CT DATA FROM AREVA ANNEXURE-4A 380kV GIS DATA SCHEDULE FROM AREVA ANNEXURE-5 MANIFA SUBSTATION ELECTRICAL LAYOUT ANNEXURE-6 380kV RELAYING & METERING ONE LINE DIAGRAM ANNEXURE-7 LINE PARAMETER ANNEXURE-8 380kV CVT DATA SCHEDULE ANNEXURE-9 M&I METROSIL CATALOGUE
BAY NUMBER: CROSS BAY C4
ABU-HADRIYAH CONTRACT No. 3-083300.01
PROJECT: ABU-HADRIYAH 380/115 kV BSP
DOCUMENT TITLE:
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
1.0 GENERAL DESIGN CRITERIA FOR CT SIZING CALCULATION 1.1 System Design Data: 1.1.1 System Voltage in kV
380kV
1.1.2 380kV system X/R Ratio
> 17
(As per 32-TMSS-02, sh. No. 31 of 53, Annexure-4A)
1.1.3 380kV Maximum 3 pahse fault level
63000
Amps
1.1.4 380kV Maximum P-E fault level
63000 :
Amps
1.1.5 Design Fault level (CB Interr. capacity)
63kA
(As per 32-TMSS-02, sh. No. 31 of 53, Annexure-4A)
1.2 DESIGN BASIS AND REFERENCES FOR CT CALCULATION : 1.2.1 CT secondary excitation limiting emf and other parameters of CT's are calculated at adopted tap setting, as shown in relaying & metering one line diagram. 1.2.2 Lead length considered is 500 meters including safety margin. Refer to the attached Abuhadriyah substation electrical layout (dwg. No. EA-009912). Refer Annexure 5 sheet 2. Thus we have ensured that assumed 500m length is not exceeded by any actual length. 500m is also used as basis for any future modifications for normal S/S life time of 35years. 1.2.3 Safety margin of 20% is considered for protection class CT and 25% for metering class CT in the formulae for CT calculation as a general and where-ever applicable relay manufacturer's recommendation is followed. 1.2.4 CT specification is considered as per PTS 07EN307 part'F', Appendix-VII and GIS vendor data. 1.2.5 Zs (source Impedance) is calculated based on CB Interrupting capacity. The Line Impedance value will be added to Zs to derive the fault current (PF & EF) at zone1 end for CT excitation limiting EMF calculation. Only one way is considered for PF zone1 Ual calculation and 2 way CT lead length is considered for EF zone1 Ual calculation. CT Calculation for close in fault is done for 3 phase fault level 63kA. We also have assumed 3km long line in view of any future modifications in the 380kV system, 1.2.6 Annexure-1: CT requirement of relay Annexure-2: VA burden requirement of relay Annexure-3: Saudi cable catalogue for CT lead resistance calculation Annexure-4: CT data from 380kV GIS vendor (TOSHIBA) Annexure-4A: Data Schedule for 380kV GIS Annexure-5: Abu-hadriyah substation electrical Layout drawing for CT/VT cable route length (dwg. No. EA-009912) Annexure-6: 380kV Relaying & Metering one line diagram for cross bay C4. Annexure-7: Line parameters Annexure-8: 380kV GIS Data schedule-CCVT Annexure-9: M&I Metrosil catalogue
BAY NUMBER:
Sheet No.
CROSS BAY C4
1 of 50
ABU-HADRIYAH CONTRACT No. 3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
1.3 CT LEAD RESISTANCE CALCULATION : CT secondary lead size considered is 6 sq.mm. 0
0
6 sq.mm copper cable resistance at 20 C is 3.08 ohms/km.i.e Rdc at 20 C = 3.08 ohm/km (Refer Annexure-3) Rdc at 75ºC = R20(1+α20(T2-T1)); α at 20ºC = 0.004,Where α= temperature co-efficient of resistance. Hence, Rdc at 75ºC = 3.08(1+0.004(75-20)); =
3.76
ohm/km
Consider a distance from 380kV GIS CT to relay panel as per layout attached with considerable (Refer Annexure-5) safe margin = 500 meter, Lead resistance calculated is, =
3.76 x 0.5
=
1.88
ohms for 500 meters
BAY NUMBER:
Sheet No.
CROSS BAY C4
2 of 50
ABU-HADRIYAH CONTRACT No. 3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.0 CT CALCULATION AS PER RELAY/INSTRUMENT MANUFACTURER'S RECOMMENDATION 2.1 CT: 810 B1.C1
Protection
:
BF protection (50BF)
Core
:
CT: 810 B1.C1
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms
<
3.1 Ohms at 2000A tap.
Knee point voltage, Vk
Vk >
3700 V at 2000A tap
CT excitation current at 2000A tap in mA
Ie <
75
Thermal rating factor
200%
Application : CB Fail Protection (50BF) Relay Type / Make: "RAICA", ABB,(50BF)
CT CALCULATION: 2.1.1 CT Vk requirement: For
2000
A
=
2000
amps
Turn ratio
=
1/2000
Is =
Nominal ( rated) CT secondary Current
=
1
amps
IF
Maximum short circuit current
=
63000
amps
IF sec =
CT Secondary short circuit current in Amps.
=
31.5
amps
RCT =
Internal CT secondary resistance
=
3.1
ohms
RL =
Lead Resistance =2 L x Rpkm / 1000
=
1.88
ohms
RL =
Lead resistance of cable.
=
1.88
Ohms
RL =
1.88
ohms.
=
0.15
VA
=
0.15
ohms
Vk
Knee point voltage
IP T
= Nominal ( rated) CT primary Current =
=
=For 6 sq.mm copper cable, RL= 0.00308 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)) Consider length of cable = 500 meters. RRAICA= RRAICA=
Relay Burden (Refer Annexure-2, Sh. No. 6) Relay resistance = RB / Is
2
=
2
(0.15/1 )
BAY NUMBER:
Sheet No.
CROSS BAY C4
3 of 50
ABU-HADRIYAH CONTRACT No. 3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
Note: Maximum Relay burdens occur for 1ph-G fault when both phase & ground BFP O/C relay units are in series. 2x BFP Relay Fault Detectors = Total=
0.30
Ohms
0.30
ohms
Ground o/c relay
0.15
ohms
phase o/c relay
[1ph-G loop] [3ph]
BFP fault detectors come once main protection operates & initiate BFP. Worst case relay operation (fatest) is ½ cycle & hence @ maximum peak during fully offset. CT Requirement considering 20% margin.
General formulae: Vkrequired > 1.2xOffset for DC x Ifsecondaryx (Connected burden)
Vkrequired > 1.2x2xIf x ( RCT + 2RL + 2x(RRAICA )) > 1.2x2x31.5 x ( 3.1 + 3.76 + 2x(0.15)) > 541.296
Volts
Since CT rated knee point voltage is 3700V which is greater than 541.3 volts, CT is adequate.
BAY NUMBER:
Sheet No.
CROSS BAY C4
4 of 50
ABU-HADRIYAH CONTRACT No. 3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.2 CT: 810 B1.C2
Protection
:
OHL feeder protection Set-1 (87L-1,21-1)
Core
:
CT: 810 B1.C2
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms
<
3.1 Ohms at 2000A tap.
Knee point voltage, Vk
Vk >
3700 V at 2000A tap
CT excitation current at 2000A tap in mA
Ie <
75
Thermal rating factor
200%
Application : OHL feeder protection Set-1 (87L-1,21-1) Relay Type / Make: "REL 531", ABB
2.2.1 Line Data: (Refer Annexure-7 attached) Line length as per annexure attached =
44.485
km
(Annexure-7)
Line parameter for Abu-hadriyah Al-fadhili line. Refer Annexure-7 for Line parameters. Z1 =
0.00054+j 0.0098 p.u
Base MVA = 100
Z0 =
0.00645+j 0.03112 p.u
Base kV = 380 2
Base Impedance calculated = (BasekV )
= 1444
ohms
= 151.9
amps
Base MVA Base Current calculated = (Base MVA) √3 x Base kV
Zline in ohms calculated; (Base Impedance x p.u Impedance)
R1=
0.794 ohms
X1=
14.15 ohms
R0=
9.314 ohms
X0=
44.94 ohms
X/R =
17
sin(tan-1(X/R)) =
0.998
cos(tan-1(X/R)) =
0.059
BAY NUMBER:
Sheet No.
CROSS BAY C4
5 of 50
Phase volt.= 219393.1
Volts
Phase Curr.= 63000
Amperes
ABU-HADRIYAH CONTRACT No. 3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.2.2 Source impedance: Xs = (Ph vol/Ph cu)xsin(tan-1(X/R))
Rs = (Ph vol/Ph cu)xcos(tan-1(X/R))
= 380000 x sin(tan-1(X/R))
= 380000 x cos(tan-1(X/R))
Sqrt.(3)x63000 = Zs=
3.48
Sqrt.(3)x63000
ohms
0.2 + j 3.48
=
0.20
ohms
ohms
2.2.3 Line impedance: X1 full Line: Line length x Reactance value/km =
14.1512
X0 full Line: Line length x Reactance value/km
ohms
=
R1 full Line: Line length x Resistance value/km
Z1 line
=
0.7942
ohms
=
0.7942 + j 14.15
ohms
44.93728
ohms
R0 full Line: Line length x Resistance value/km =
9.3138
Z0 line = 9.3 + j 44.94
ohms ohms
2.2.4 THREE PHASE FAULT CONDITION Close in Fault Fault current =
63
X/R =
17
kA
Source Imp. Z1=Z2=Z0 0.2 = + j 3.48
ohms
Through fault current at the end of the line: For 44.485 Km line Impedance calculated : (Rs + R1) + j(Xs+X1) (Positive sequence)
= (0.2+0.794) + j (3.48+14.15) = 0.994+j17.63
ZT1 = 17.66 Phase fault current =
ohms ohms
Ph. Volt / Ph. Imp. =
380000 Sqrt.(3)x17.63
= 12424.57 Phase fault X/R
=
Amps
17.63 0.994
=
17.74
BAY NUMBER:
Sheet No.
CROSS BAY C4
6 of 50
ABU-HADRIYAH CONTRACT No. 3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
380 kV CT/VT SIZING CALCULATION
DOCUMENT NUMBER: EA-086959
Fault current calculation at the end of zone1 fault i.e 80% of line length: For 44.485 Km line Impedance calculated : (Rs+0.8R1) + j(Xs+0.8X1) (Positive sequence)
= (0.2+0.635) + j (3.48+11.32) = 0.84+j14.8
ZT1 = 14.82 Phase fault current =
ohms
Ph. Volt / Ph. Imp. =
380000 Sqrt.(3)x14.82
= 14800.04 Phase fault X/R
=
Amps
14.82 0.835
= 17.75
2.2.5 SINGLE PHASE-GROUND FAULT CONDITION: Through fault current at the end of the line: For 44.485 Km line Impedance calculated : (3Rs+2R1+R0) + (Loop Impedance)
j(3Xs+2X1+X0) = 11.5+j83.79
ZT1 = 84.39 Earth fault current =
ohms ohms
Ph. Volt / Ph. Imp. =
380000 Sqrt.(3)x84.39
I0 Earth fault X/R
= 2599.62 =
Amps
83.79 11.5
3I0
=
7.29
=
7798.87
Amps
BAY NUMBER:
Sheet No.
CROSS BAY C4
7 of 50
ABU-HADRIYAH CONTRACT No. 3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
Fault current calculation at the end of zone1 fault i.e 80% of line length: For 44.485 Km line Impedance calculated : (3Rs+0.8x2R1+R0) + (Loop Impedance)
j(3Xs+0.8x2X1+X0) = 9.32+j69.12
ZT1 = 69.75 Earth fault current =
ohms ohms
Ph. Volt / Ph. Imp. =
380000 Sqrt.(3)x69.75
= 3145.62 Earth fault X/R
=
Amps
69.12 9.32
3I0=
=
7.42
=
9436.869326
Amps
2.2.6 CT Requirement : ( As per Annexure-1, Sh. No.20,21)
Eal Eal Eal Eal
> Ealreq > Ealreq > Ealreq > Ealreq
= {I kmax x I sn} / Ipn x 0.5 x (RCT + RL + SR / Ir
2
Equation-1
)
2
Equation-2
= 2 x {Ikmax x I sn} / Ipn x (RCT + RL + SR / Ir ) 2
Equation-3
= 0.12 x f x Isn x(RCT + RL + SR / Ir ) = (Imin sat x CT factor x Ir) / 100 x (RCT + RL + SR / Ir
2
Equation-4
)
Where, Ikmax =
Maximum Primary fundamental frequency fault current for internal close-in faults (A)
Itfdb =
Maximum Primary fundamental frequency fault current for external faults (A) that passes through two CT's (A). Here for one and half breaker scheme Ikmax is equal to Itfdb.
Ipn =
The rated primary CT current (A)
Isn =
The rated secondary CT current (A)
Ir =
The rated current of the protection IED (A)
SR =
The burden of IED 670 a current input channel (VA). SR = 0.25 VA/channel.
f=
system frequeny in Hz.
Imin sat= Saturation detector min current ( 100 - 1000% Of Ir) and set at 500% CT factor = set current scalling factor (0.4 - 1.0)
Where,
For
Ealreq=
Required secondary e.m.f.
Eal =
Rated equivalent secondary e.m.f.= Vk
I K max =
Maximum short circuit current-Three phase
2000
amps
=
3700
volts
=
63000
amps
BAY NUMBER:
Sheet No.
CROSS BAY C4
8 of 50
ABU-HADRIYAH CONTRACT No. 3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
Itfdb =
Maximum Primary fault current for external faults (A)
=
63000
amps
I pn =
Nominal ( rated) CT primary Current
=
2000
amps
I sn =
Nominal ( rated) CT secondary Current
=
1
amps
RCT =
CT secondary winding resistance
=
3.1
ohms
RB
=
Burden of relay
=
0.25
ohms
RL
=
Lead resistance of cable. =For 6 sq.mm copper cable, RL= 3.08 ohm/kmeter at 20ºC.
Ir f
= =
α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1))
RL
1.88
Consider length of cable = 500 meters.
2RL =
3.76
ohms
Protection terminal rated Current
=
1
amps
System Frequency
=
60
Hz
=
17
.= ( 17 / 2x 3.14x 60) x 1000
=
45.09
msec
Burden value for TFR (Refer Annexure-2,Sh. No.7)
=
0.01
VA
=
0.26
VA
Imin Sat=
Sat saturation detector min current
X/R =
System ratio
Tp
Primary time constant, (L/R)
=
L/R = (X/(2x 3.14x f )/R
RTFR =
Hence, total VA burden including TFR.
Voltage developed across CT as per ABB relay catalogue. At 2000/1 A tap Considering 20% margin
Eal
> Ealreq = {I kmax x I sn} / Ipn x 0.5 x (RCT + RL + SR / Ir
2
Equation-1
)
As per REL 531 relay requirement, the factor 0.5( for Tc less than 120ms) is replaced with 0.53 & 0.54 for primary time constant of 200ms and 300ms respectively.
Ealreq = 63000 x 1 x 0.5 x ( 3.1+ 1.88 + 0.27/1^2 )
=
82.5
volts
=
99.0
volts
2000 With 20% extra margin Ealreq
BAY NUMBER:
Sheet No.
CROSS BAY C4
9 of 50
ABU-HADRIYAH CONTRACT No. 3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
Eal
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
> Ealreq = 2 x {Ikmax x I sn} / Ipn x (RCT + RL + SR / Ir
2
EA-086959
Equation-2
)
As per REL 531 relay requirement, the factor 2 ( for Tc less than 120ms) is replaced with 2.32 & 2.5 for primary time constant of 200ms and 300ms respectively.
Ealreq = 63000 x 1 x 2 x ( 3.1+ 1.88 + 0.27/1^2 )
=
330.1
volts
=
396.1
volts
2000 With 20% extra margin Ealreq
Eal
> Ealreq = 0.12 x f x Isn x (RCT + RL + SR / Ir
2
Equation-3
)
2
Ealreq = 0.12 x 50 x 1x(3.1+ 1.88 +0.27/1 )
=
31.4
volts
With 20% extra margin Ealreq
=
37.7
volts
Eal
> Ealreq
= (Imin sat x CT factor x Ir) / 100 x (RCT + RL + SR / Ir 2 )
2
Ealreq = 500 x 1 x 1x(3.1+ 1.88 +0.27/1 )
Equation-4
=
26.2
volts
=
31.4
volts
100 With 20% extra margin Ealreq
Since CT rated knee point voltage is 3700V which is greater than the required value, the proposed CT is adequate.
The Voltage developed across the CT secondary for distance protection (21L) feature as per ABB catalogue. (Refer Annexure-1 Sh. No. 22 ) Requirement -1 At 2000/1 A tap Eal
> Ealreq = {I kmax x I sn} / Ipn x a x (RCT + RL + SR / Ir 2 )
Equation-5
a' = 2 for primary time constant less than 50msec. With 20% extra margin Ealreq = 63000 x 1.2 x 2 x ( 3.1+ 1.88 + 0.27/1^2 )
=
538.3
volts
2000
BAY NUMBER:
Sheet No.
ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
10 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
Requirement -2 Eal
> Ealreq = Ikzone1x 7 x (Isn / Ipn) x (RCT + RL + SR / Ir
2
Equation-6
)
k' = 7 for primary time constant greater than 30 msec. Ikzone1= Maximum primary fundamental fault current at the end of zone 1 reach. Considering 80% of actual line length
=
14800.04 Amps
(Refer above fault current calculation at the end of zone1 reach considering actual line length) At 2000/1 A tap and with 20% extra margin 2
=
Ealreq = 14800 x 1.2 x 7 x ( 3.1+ 1.88 +0.27/1 )
442.58038 volts
2000 Since CT rated knee point voltage is 3700V which is greater than the required value, the proposed CT is adequate.
BAY NUMBER:
Sheet No.
ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
11 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.3 CT: 810 B1.C3
Protection
:
OHL feeder protn. -Set-2 (87L-2,21-2)
Core
:
CT: 810 B1.C3
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms
<
3.1 Ohms at 2000A tap.
Knee point voltage, Vk
Vk >
3700 V at 2000A tap
CT excitation current at 2000A tap in mA
Ie <
75
Thermal rating factor
200%
Application : OHL feeder protection - Set-2 (87L-2,21-2) Relay Type/make : ''7SA522 ", Siemens.
2.3.1 CT Calculation Where
For
Vk =
Knee point voltage of CT
RB =
Resistance of relay 7SA522
Rr =
Relay resistance
RCT =
CT secondary winding resistance
RL =
Lead resistance of cable.
2000
amps
3700
Volts
=
0.05
ohms
=
3.1
ohms
For 6 sq.mm copper cable, RL= 3.08 ohm/kmeter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1))
RL =
1.88
ohms
Consider length of cable = 500 meters.
2RL=
3.76
ohms
IP =
Nominal ( rated) CT primary Current
=
2000
amps
IS =
Nominal ( rated) CT secondary Current
=
1
amps
ISCC max = Maximum short circuit current-Three phase
=
63000
amps
VK
CT knee point voltage specified
=
3700
volts
X/R =
System ratio
=
17
If
Maximum value of through fault current for =
31.50
( I f )x( X/R) =
535.5
=
stability ( multiple of Is) = I
Tp
=
SCC max
/ IP
Primary time constant, (L/R) L/R = (X/(2x 3.14x f )/R .= ( 17 / 2x 3.14x 60) x 1000
=
45.09
msec
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PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
The CT should meet the following Vk requirement as per Siemens publication. ( Refer Annexure-1 Sh. No. 24 )
Vk 1
>
{Ktd(a)xIssc max(close-in fault)/1.3xIpn} x Isn x (RB + RCT +RL)
For close-in fault
Vk 2
>
{Ktd(b)xIssc max(zone-1 end fault)/1.3xIpn} x Isn x (RB + RCT +RL)
For zone-1 end fault
Ktd(a) = 2' for primary time constants less than 50ms Ktd(b) = 5' for primary time constants less than 50ms Vk1 =
Accuracy limiting voltage for close in fault in volts
Vk2 =
Accuracy limiting voltage for end of zone 1 line fault in volts
IFZ1 =
Maximum secondary fault current for end of zone 1 fault in amps. Considering actual line length as a worst case, primary fault current (A) calculated is equal 14800.04 Amps. Hence, CT secondary fault current =
14800.04 2000 =
RB
=
7.40
Amps.
Relay burden
CT requirement for close-in fault condition: Vk 1
>
{Ktd(a)xIssc max(close-in fault)/1.3xIpn} x Isn x (RB + RCT +RL)
= {2 x 63000/1.3x2000} x (0.05 + 3.1 + 1.88)
=
244
volts
Vk 2 with 20 % margin
=
293
volts
Peak voltage
=
413.7
Vpeak
CT requirement for zone1 fault condition: Vk 2
>
{Ktd(b)xIssc max(zone-1 end fault)/1.3xIpn} x Isn x (RB + RCT +RL)
= {5 x 14800/1.3x2000} x (0.05 + 3.1 + 1.88)
=
143
volts
Vk 2 with 20 % margin
=
172
volts
Peak voltage
=
243.0
Vpeak
Since CT rated knee point voltage is 3700V which is greater than the required value, the proposed CT is adequate.
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PROJECT: ABU-HADRIYAH 380/115 kV BSP
DOCUMENT TITLE:
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.4 CT: 810 B1.C4
Protection
:
Metering
Core
:
CT: 810 B1.C4
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
0.2
VA Burden
50
VA
Thermal rating factor
200%
Application : Metering Burden Calculation (Refer Annexure-2) a
LCP Ammeter
b
0.5 VA
Revenue metering panel ABB, ALPHA A3R
c
d
(Assumed)
1E-04 VA
( Refer Annexure-1 Sh. No. 18 )
Watt transducer, , AREVA, ISTAT300
1 VA
( Refer Annexure-1 Sh. No. 13 )
Var transducer, AREVA, ISTAT300
1 VA
( Refer Annexure-1 Sh. No. 13 )
Mosaic panel
Watt meter, PML ION6200
0.5 VA
(Assumed)
Var meter PML ION6200
0.5 VA
(Assumed)
DSM
0.1 VA
(Assumed)
Cabling loop (500 meters) For 4 sq.mm copper cable, RL= 0.00461 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)); Consider length of wire = 500 meters.
RL
=
2.812 Ohms
2RL
=
5.624 VA
Total connected burden, PBC =
9.224 VA
Considering 25% safe margin, connected VA equals to=
11.53 VA
CT Rated burden = 50VA
The total connected burden is less than the CT rated burden i.e 50VA. Hence the CT is adequate.
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PROJECT: ABU-HADRIYAH 380/115 kV BSP
DOCUMENT TITLE:
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.5 CT: 810 F.C3
Protection
:
Spare
Core
:
CT: 810 F.C3
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms
<
4.65 Ohms at 3000A tap.
Knee point voltage, Vk
Vk >
5550 V at 3000A tap
CT excitation current at 3000A tap in mA
Ie <
50
Thermal rating factor
200%
Application : Spare
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PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.6 CT: 810 F.C2
Protection
:
Bus-bar protection (87M2)
Core
:
CT: 810 F.C2
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms <
4.65 Ohms at 3000A tap.
Knee point voltage, Vk
Vk >
5550 V at 3000A tap
CT excitation current at 3000A tap in mA
Ie <
50
Thermal rating factor
200%
NOTE: Typical bus-bar protection CT's core detail for adjacent cross bay's(3 nos. including future bays) are shown below.
Protection
:
Bus-bar protection (87M2)
Core
:
Core 2
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms <
4.65 Ohms at 3000A tap.
Knee point voltage, Vk
Vk >
5550 V at 3000A tap
CT excitation current at 3000A tap in mA
Ie <
50
Thermal rating factor
200%
Application : Bus-Bar Protection-Main-2 (87M2) Relay Type / Make: "MFAC14", AREVA (Setting range: 25V-325V)
2.6.1 CT Calculation The setting voltage is determined by the following relationship. (Refer Annexure-1, Sh. No.11) 1.2 x If x ( RCT + 2 x RL )
Vs >
(20% additional margin is taken)
Where IP
=
For
3000
Nominal ( rated) CT primary Current
3000
amps
1
amps
63000
amps
IS
=
Nominal ( rated) CT secondary Current
IF
=
Maximum Fault Current
=
CT secondary fault current
=
21
amps
4.65
ohms
If
=
RCT =
Internal CT secondary resistance
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DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
RL =
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
Lead resistance of cable.
EA-086959
=
1.88
Ohms
RL =
1.88
ohms.
=
5550
Volts
=For 6 sq.mm copper cable, RL= 0.00308 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)) Consider length of cable = 500 meters. Vk =
Specified knee point voltage
Calculation of relay setting voltage: Vs >
1.2 x If x ( RCT + 2 x RL )
Vs >
1.2 x 21 x (4.65 + 3.76 )
Vs >
211.932
Hence select Vs
=
275
Vrms
Peak voltage
=
388.91
Vpeak
Hence, select a metrosil with setting range 25V- 325V and set at 275 volts.
2.6.2 Metrosil requirement For this relay Metrosil proposed by the manufacturer has the following parameters. C
=
900
β
=
0.25
The current drawn by metrosil at relay setting voltage is given by formulae below. Irms drawn= where
0.52((√2xV')/C))1/β V' = voltage in (RMS Sine)
Metrosil recommended for 25-325V relay range @ 2kVrms Irms drawn= =
0.52x((√2x2000)/900)1/0.25 50.72
A rms
At voltage setting Vs = 275V, Metrosil draws about 18mA
%Error
=
(0.018 / Ifs ) x 100
=
(0.018 / 21 ) x 100
=
0.086%
Error introduce by metrosil at voltage setting Vs = 275V is 0.086% only.
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DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
Metrosil selection:
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
(Refer Annexure-8)
To limit voltage to 2kVrms, select metrosil same as recommended by MFAC 14 for Vs = 275V C
=
900
β
=
0.25
As per M&I materials catalogue attached, for the above 'C' and 'β' characteristics, the recommended metrosil type is 600A/S1/S1088. We recommend standard metrosil as per AREVA recommandation only as the relay & scheme is by AREVA. CT secondary fault current calculated as above =
21
Amps.
Hence, Metrosil withstanding capability is greater than CT secondary current.
2.6.3 Determination of primary fault current setting: At 3000/1 A tap Taking Primary fault currrent setting as 1% of maximum fault current i.e 63000 Amps. 1% of bus-bar fault current
=
630
amps
Primary Fault current setting Calculation The primary operating current or fault setting calculated as Ip=
{ n Im+ Ir +IM+IV}xT
Ip
=
Primary fault setting
n
=
number of CTs in parallel including 3 future bays
Im
=
exciting current of each CT at the relay circuit setting voltage
=
8.0 0.005
Amps
90000.0
ohms
Current in MVTP11 relay, (Vs/RMVTP31)
0.003
Amps
current in metrosil at the relay circuit setting voltage
0.018
Amps
0.03
Amps
RMVTP31 =
Resistance of CT supervision relay MVTP 31(Assumed)
IV IM
= =
Ir = Relay operating current as per MFAC manual for setting range 25-325V Where relay setting voltage is low then current in non linear resistor is ignored. Primary fault setting (Ip) =
{n Im+ Ir +IM+IV}xT =
273.167
This current is too small as compared to 63kA i.e 0.43% of 63kA. It is observed that the primary operating current is less than 630A. Hence, an external shunt resistor (Rsh) needs to be connected inorder to get a primary operating current 630A.
Select shunt resistor to get primary operating current of say 742 Amps. Ip =
{ nIe+ Ir +IM+(Vs/Rsh)+IV}xT
742 =
{8x0.005+0.03+0.018+(275/Rsh)+0.003} x3000
0.156
The value of external shunt resistor required is calculated as
Rsh =
1759.7
ohms
As per AREVA MCAG14 catalogue attached Annexure-2 sheet no. 4 Select a resistor 2700 ohms and set at 1760 ohms with the short time current rating (1 seconds) of 1.3 Amps.
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DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.6.4 Shunt resistor Wattage calculation: Current in shunt resistor at setting voltage Vs =275 Volts;= 275 Shunt resistor Wattage = 0.16x0.16x1760 45.06
Watts.
=
0.16
Amps.
1759.7
Watts.
Hence, select a shunt resistor of 50 watts. Hence, Primary operating current calculated = Primary fault setting (Ip) =
{n Im+ Ir +IM+IV+IRsh}T =
742.0
Amps.
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PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.7 CT: 810 F.C1
Protection
:
Bus-bar protection (87M1)
Core
:
CT: 810 F.C1
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms <
4.65 Ohms at 3000A tap.
Knee point voltage, Vk
5550 V at 3000A tap
Vk >
CT excitation current at 3000A tap in mA Iex <
50
Thermal rating factor
200%
NOTE: Typical bus-bar protection CT's core detail for adjacent cross bay's(3 nos. including future bays) are shown below.
Protection
:
Bus-bar protection (87M1)
Core
:
Core 1
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms < Knee point voltage, Vk CT excitation current at 3000A tap in mA
4.65 Ohms at 3000A tap. Vk >
Ie <
Thermal rating factor
5550 V at 3000A tap 50 200%
Application : Bus-Bar Protection-Main-1 (87M1) Relay Type / Make: "MCAG 14", AREVA (Setting range: 20%-80% of 1A)
2.7.1 CT Requirement Where
For Knee point voltage
Vk Vs
=
3000
A
5550
volts
amps
Setting Voltage
IP
= Nominal ( rated) CT primary Current
=
3000
T
= Turn ratio
=
1/3000
Is
= Nominal ( rated) CT secondary Current
=
1
amps
Maximum short circuit current
=
63000
amps
CT secondary fault current in amps.
=
21
amps
IF If
= =
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DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
RCT
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
= Internal CT secondary resistance
EA-086959
=
4.65
ohms
=
1.88
Ohms
RL =
1.88
ohms.
RB-MCAG =Relay Burden
=
1.00
VA
RRMCAG = Relay resistance = RB / Is 2
=
1.00
ohms
RL
= Lead resistance of cable. =For 6 sq.mm copper cable, RL= 0.00308 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)) Consider length of cable = 500 meters.
The setting voltage Vs shall be calculated in order to ensure the stability of the protection in regard with the maximum through fault current If . The setting voltage is determined by the following eqn. Vs >
1.2 x If x ( RCT + 2 x RL )
Vs >
1.2 x 21 x (4.65 + 3.76 )
Vs >
211.932
(Refer Annexure-1, Sh.No.8)
Hence, select Vs same as Main-2 protection = Peak voltage
=
275
Vrms
388.91
Vpeak
2.7.2 Voltage Llimiting Resistor- Metrosiles: (Refer MCAG 14 sheet attached) To establish the requirement for a Metrosil the peak voltage needs to exceed 3kV. Hence V rms needs to be exceeded is equal to (Vpk/ root2) = VPK =
( 2 VK ( V f -VK))
Where
VPK =
2.12 kV
1/2
Peak voltage of the voltage wave form.
Vf =
If x Tx(RCT+2RL+Rsr+RRMCAG)
Where Vf VPK =
=
Maximum voltage in absence of saturation ( 2x5550x (28547.6- 5550))
1/2
=
28547.6
=
15977.28 volts
=
15.98
volts
kVolts
VPK is 15.98kV which is more than 3kV hence Metrosiles are required.
Therefore select metrosil to limit the secondary voltage to 3kV peak.
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ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
Metrosil requirement For this relay Metrosil proposed by the manufacturer has the following parameters. C
=
900
β
=
0.25
The current drawn by metrosil at relay setting voltage is given by formulae below. 0.52((√2xV')/C))1/β
Irms drawn= where
V' = voltage in (RMS Sine)
Metrosil recommended for 25-325V relay range @ 2kVrms 0.52x((√2x2000)/900)1/0.25
Irms drawn= =
50.72
A rms
At voltage setting Vs = 275V, Metrosil draws about 18mA
%Error
=
(0.018 / Ifs ) x 100
=
(0.018 / 21 ) x 100
=
0.387%
Error introduce by metrosil at voltage setting Vs = 275V is 0.086% only.
Metrosil selection:
(Refer Annexure-9)
To limit voltage to 2kVrms, select metrosil same as recommended by MCAG14 for Vs = 275V C
=
900
β
=
0.25
As per M&I materials catalogue attached, for the above 'C' and 'β' characteristics, the recommended metrosil type is 600A/S1/S1088. We recommend standard metrosil as per AREVA recommandation only as the relay & scheme is by AREVA. CT secondary fault current calculated as above =
21
Amps.
Hence, Metrosil withstanding capability is greater than CT secondary current.
2.7.3 Determination of primary fault current setting: Taking Primary fault currrent setting as 1% of maximum fault current i.e 63000 Amps. 1% of bus-bar fault current
=
630
amps
Primary Fault current setting Calculation The primary operating current or fault setting calculated as Ip=
{ n Im+ Ir +IM+IV}xT
Ip
=
Primary fault setting
n
=
number of CTs in parallel including 3 future bays
Im
=
exciting current of each CT at the relay circuit setting voltage
RMVTP31 =
=
Resistance of CT supervision relay MVTP 31(Assumed)
8.0 0.005
Amps
90000.0
ohms
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DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
IV IM Ir
= = =
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
Current in MVTP11 relay, (Vs/RMVTP31)
0.003
Amps
current in metrosil at the relay circuit setting voltage (Assumed) '=
0.018
Amps
Relay setting current
0.20
Amps
Where relay setting voltage is low then current in non linear resistor is ignored. = Primary fault setting (Ip) =
{ n Im+ Ir +IM+IV}xT {(8x0.005)+0.2+0.018+0.003}x3000 =
783.2
Amps.
2.7.4 Determination of stabilising resistor Rsr: (Refer MCAG 14 Manual attached, Annex-1, Sh. No.10) Relay circuit Voltage
Vs =
Relay setting current,
Is =
275.00 Volts 0.20 Amps
Relay burden at 275V setting is considered as 1VA, Stabilising resistor required, Rsr =
(Vs/Ir) - (Relay burden)/(Ir^2)
Rs=
= 1350.00 ohms
Select a resistor of range (0 -1500 ohms),0.31A continous,1.36A/3sec,1.8A/1sec as per MCAG 14 Manual.
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PROJECT: ABU-HADRIYAH 380/115 kV BSP
DOCUMENT TITLE:
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.8 CT: 811 B1.C1
Protection
:
CB fail protection
Core
:
CT: 811 B1.C1
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms
<
3.1 Ohms at 2000A tap.
Knee point voltage, Vk
Vk >
3700 V at 2000A tap
CT excitation current at 2000A tap in mA
Ie <
75
Thermal rating factor
200%
Application : CB Fail Protection (50BF) Relay Type / Make: "RAICA", ABB,(50BF) CT calculation same as CT: 810 B1.C1. Refer above CT: 810 B1.C1 for detailed calculation.
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DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.9 CT: 811 B1.C2
Protection
:
OHL feeder protn. -Set-1 (87L-1,21-1)
Core
:
CT: 811 B1.C2
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms
<
3.1 Ohms at 2000A tap.
Knee point voltage, Vk
Vk >
3700 V at 2000A tap
CT excitation current at 2000A tap in mA
Ie <
75
Thermal rating factor
200%
Application : OHL feeder protection Set-1 (87L-1,21-1) Relay Type / Make: "RED 670", ABB 2.9.1 Line Data: (Refer Annexure-7 attached) Line length as per annexure attached = Z1 =
0.00055+j 0.0108 p.u
Z0 =
0.00545+j 0.0322 p.u
50
km
Base MVA = 100 Base kV = 380 2
Base Impedance calculated = (BasekV )
= 1444
ohms
= 151.9
amps
Base MVA Base Current calculated = (Base MVA) √3 x Base kV
Zline in ohms calculated; (Base Impedance x p.u Impedance)
R1=
0.794 ohms
X1=
15.6
ohms
R0=
7.87
ohms
X0=
46.5
ohms
X/R =
17
sin(tan-1(X/R)) =
0.998
cos(tan-1(X/R)) =
0.059
Phase volt.= 219393.1
Volts
Phase Curr.= 63000
Amperes
2.9.2 Source impedance: Xs = (Ph vol/Ph cu)xsin(tan-1(X/R)) = 380000 x sin(tan-1(X/R))
Rs = (Ph vol/Ph cu)xcos(tan-1(X/R)) = 380000 x cos(tan-1(X/R))
Sqrt.(3)x63000 = Zs=
3.48 0.2 + j 3.48
ohms
Sqrt.(3)x63000 =
0.20
ohms
ohms
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DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.9.3 Line impedance: X1 full Line: Line length x Reactance value/km =
15.5952
X0 full Line: Line length x Reactance value/km
ohms
=
R1 full Line: Line length x Resistance value/km
Z1 line
=
0.7942
ohms
=
0.7942 + j 15.6
ohms
46.4968
ohms
R0 full Line: Line length x Resistance value/km =
7.8698
Z0 line = 7.8698 + j 46.5
ohms ohms
2.9.4 THREE PHASE FAULT CONDITION Close in Fault Fault current =
63
X/R =
17
kA
Source Imp. Z1=Z2=Z0 0.2 = + j 3.48
ohms
Through fault current at the end of the line: 1) For 50 Km line Impedance calculated : (Rs + R1) + j(Xs+X1) (Positive sequence)
= (0.2+0.794) + j (3.48+15.6) = 0.994+j19.08
ZT1 = 19.11 Phase fault current =
ohms ohms
Ph. Volt / Ph. Imp. =
380000 Sqrt.(3)x19.11
= 11483.02 Phase fault X/R
=
Amps
19.08 0.994
=
19.20
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ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
26 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
380 kV CT/VT SIZING CALCULATION
DOCUMENT NUMBER: EA-086959
Fault current calculation at the end of zone1 fault i.e 80% of line length: 1) For 50 Km line Impedance calculated : (Rs+0.8R1) + j(Xs+0.8X1) (Positive sequence)
= (0.2+0.635) + j (3.48+12.5) = 0.84+j16
ZT1 = 16.02 Phase fault current =
ohms
Ph. Volt / Ph. Imp. =
380000 Sqrt.(3)x16.02
= 13693.21 Phase fault X/R
=
Amps
15.98 0.835
=
19.14
2.9.5 SINGLE PHASE-GROUND FAULT CONDITION: Through fault current at the end of the line: 1) For 50 Km line Impedance calculated : (3Rs+2R1+R0) + (Loop Impedance)
j(3Xs+2X1+X0) = 10.08+j88.12
ZT1 = 88.69 Earth fault current =
ohms ohms
Ph. Volt / Ph. Imp. =
380000 Sqrt.(3)x88.69
I0 Earth fault X/R
= 2473.58 =
Amps
88.12 10.08
3I0
=
8.74
=
7420.73
Amps
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ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
27 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
Fault current calculation at the end of zone1 fault i.e 80% of line length: 1) For 50 Km line Impedance calculated : (3Rs+0.8x2R1+R0) + (Loop Impedance)
j(3Xs+0.8x2X1+X0) = 8.18+j72.5
ZT1 = 72.96 Earth fault current =
ohms ohms
Ph. Volt / Ph. Imp. =
380000 Sqrt.(3)x72.96
= 3007.03 Earth fault X/R
=
Amps
72.50 8.18
3I0=
=
8.86
=
9021.097278
Amps
2.9.6 CT Requirement : ( As per Annexure-1, Sh. No.2)
Eal Eal Eal
> Ealreq > Ealreq > Ealreq
= {I kmax x I sn} / Ipn x (RCT + RL + SR / Ir 2 )
Equation-1 2
Equation-2
= 2 x {I tmax x I sn} / Ipn x (RCT + RL + SR / Ir ) = Itfdb x (Isn / Ipn) x (RCT + RL + SR / Ir
2
Equation-3
)
Where, Ikmax =
Maximum Primary fundamental frequency fault current for internal close-in faults (A)
Itfdb =
Maximum Primary fundamental frequency fault current for external faults (A) that passes through two CT's (A). Here for one and half breaker scheme Ikmax is equal to Itfdb.
Ipn =
The rated primary CT current (A)
Isn =
The rated secondary CT current (A)
Ir =
The rated current of the protection IED (A)
SR =
The burden of IED 670 a current input channel (VA). SR = 0.25 VA/channel.
Where,
For
2000
amps
Ealreq=
Required secondary e.m.f.
Eal =
Rated equivalent secondary e.m.f.= Vk
=
3700
volts
I K max =
Maximum short circuit current-Three phase
=
63000
amps
Itfdb =
Maximum Primary fault current for external faults (A)
=
63000
amps
I pn =
Nominal ( rated) CT primary Current
=
2000
amps
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3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
I sn =
Nominal ( rated) CT secondary Current
=
1
amps
RCT =
CT secondary winding resistance
=
3.1
ohms
RB
=
Burden of relay
=
0.25
ohms
RL
=
Lead resistance of cable. =For 6 sq.mm copper cable, RL= 3.08 ohm/kmeter at 20ºC.
Ir f
= =
α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1))
RL
1.88
Consider length of cable = 500 meters.
2RL =
3.76
ohms
Protection terminal rated Current
=
1
amps
System Frequency
=
60
Hz
=
17
.= ( 17 / 2x 3.14x 60) x 1000
=
45.09
msec
Burden value for TFR (Refer Annexure-2,Sh. No.7)
=
0.01
VA
=
0.26
VA
Imin Sat=
Sat saturation detector min current
X/R =
System ratio
Tp
Primary time constant, (L/R)
=
L/R = (X/(2x 3.14x f )/R
RTFR =
Hence, total VA burden includong TFR
Voltage developed across CT as per ABB relay catalogue (Refer Annexure-1 Sh. No.2 ) At 2000/1 A tap Considering 20% margin Eal
> Ealreq = {I kmax x I sn} / Ipn x (RCT + RL + SR / Ir
2
Equation-1
)
Ealreq = 63000 x 1 x ( 3.1+ 1.88 + 0.26/1^2 )
=
224.3
volts
=
269.1
volts
2000 With 20% extra margin Ealreq
Eal
> Ealreq = 2 x {I tmax x I sn} / Ipn x (RCT + RL + SR / Ir 2 )
Ealreq = 63000 x 1 x 2 x ( 3.1+ 1.88 + 0.26/1^2 )
Equation-2
=
448.6
volts
=
538.3
volts
2000 With 20% extra margin Ealreq
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ABU-HADRIYAH CONTRACT No.
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3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
At 2000/1 A tap Eal
> Ealreq = Itfdb x (Isn / Ipn) x (RCT + RL + SR / Ir
2
Equation-3
)
Ealreq = 63000 x 1x(3.1+ 1.88 +0.26/12 )
=
224.3
volts
=
269.1
volts
2000 With 20% extra margin Ealreq
Since CT rated knee point voltage is 3700V which is greater than the required value, the proposed CT is adequate.
The Voltage developed across the CT secondary for distance protection (21L) feature as per ABB catalogue. (Refer Annexure-1 Sh. No. 3 ) Requirement -1 At 2000/1 A tap Eal
> Ealreq = {I kmax x I sn} / Ipn x a x (RCT + RL + SR / Ir
2
Equation-5
)
a' = 2 for primary time constant less than 50msec. With 20% extra margin Ealreq = 63000 x 1.2 x 2 x ( 3.1+ 1.88 + 0.26/1^2 )
=
538.3
volts
2000
Requirement -2 Eal
> Ealreq = Ikzone1x k x (Isn / Ipn) x (RCT + RL + SR / Ir 2 )
Equation-6
k' = 6 for primary time constant greater than 30 msec. Ikzone1= Maximum primary fundamental fault current at the end of zone 1 reach. At 2000/1 A tap and with 20% extra margin Ealreq = 13693.21 x 1.2 x 6 x ( 3.1+ 1.88 +0.26/12 )
=
350.98
volts
2000 Since CT rated knee point voltage is 3700V which is greater than the required value, the proposed CT is adequate.
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ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
30 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.10 CT: 811 B1.C3
Protection
:
OHL feeder protn. -Set-2 (87L-2,21-2)
Core
:
CT: 811 B1.C3
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms <
3.1 Ohms at 2000A tap.
Knee point voltage, Vk
Vk >
3700 V at 2000A tap
CT excitation current at 2000A tap in mA
Ie <
75
Thermal rating factor
200%
Application : OHL feeder protection - Set-2 (87L-2,21-2) Relay Type/make : ''MiCOM P546", Areva. 2.10.1 CT Calculation Where
For
Vk =
Knee point voltage of CT
RB =
Resistance of relay P543
Rr =
Relay resistance
RCT =
CT secondary winding resistance
RL =
Lead resistance of cable.
2000
amps
3700
Volts
=
0.04
ohms
=
3.1
ohms
For 6 sq.mm copper cable, RL= 3.08 ohm/kmeter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1))
RL =
1.88
ohms
Consider length of cable = 500 meters.
2RL=
3.76
ohms
IP =
Nominal ( rated) CT primary Current
=
2000
amps
IS =
Nominal ( rated) CT secondary Current
=
1
amps
ISCC max = Maximum short circuit current-Three phase
=
63000
amps
VK
CT knee point voltage specified
=
3700
volts
X/R =
System ratio
=
17
If
Maximum value of through fault current for =
31.50
( I f )x( X/R) =
535.5
=
stability ( multiple of Is) = I
SCC max
/ IP
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ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
31 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
The CT should meet the following Vk requirement as per Areva publication. ( Refer Annexure-1 Sh. No. 5 - 6 )
Vk1
>
K xI n x (RB + RCT +RL)
(equation -1) for through fault condition
Vk 2
>
KRPA xIFZ1 x (1+X/R)x(RB + RCT +RL+Rr)
(equation -2) for zone1 fault condition
Vk3
>
Kmax x IFmax x (RB + RCT +RL+Rr)
(equation -3) for close-up fault
Vk1 =
Accuracy limiting voltage for line through fault condition in volts
Vk2 =
Accuracy limiting voltage for end of zone 1 line fault in volts
Vk2 =
Accuracy limiting voltage for close in fault in volts
IFZ1 =
Maximum secondary fault current for end of zone 1 fault in amps. For 50kM line length , primary fault current (A) calculated is equal to = Amps. Hence, CT secondary fault current =
13693.21
13693.21 2000 =
6.85
Amps.
KRPA =
Fixed dimensioning factor for zone 1 fault and always
=
0.6
(Refer Annex-1, Sh. No. 7)
Kmax =
Fixed dimensioning factor for close in fault and always =
1.4
(Refer Annex-1, Sh. No. 7)
RB
Relay burden
=
Where K is dimensioning factor and depends upon the maximum value of through fault current(as a multiple of In) and primary system X/R ratio. For three end current differential schemes relay set at Is1=20%, Is2=2In, K1=30% and K2=100%, K' is calculated as below.
(Refer Annex-1, Sh. No. 6)
For through fault condition the fault current and X/R calculated above are IF =
11483.02
Amps. (Primary);
CT secondary fault currect calculated =
X/R =
19.20
5.74
If x X/R = 110.24 If, If x X/R < 1000xIn, K> 40 + 0.35 x (If x X/R) K> 40 + 0.35x(110.24) K> 78.584 As per AREVA relay catalogue, K > 78.584
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ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
32 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
CT requirement for through fault condition: K x I n x ( RB + RCT +2RL )
Vk = .=
78.584 x 1 x ( 0.04 + 3.1 + 3.76 )
=
542
volts
Vk with 20 % margin
=
651
volts
Peak voltage
=
920.2
=
415
volts
Vk 2 with 20 % margin
=
498
volts
Peak voltage
=
704.8
=
221
volts
Vk 2 with 20 % margin
=
266
volts
Peak voltage
=
375.7
Vpeak
CT requirement for zone1 fault condition: Vk 2
>
KRPA xIFZ1 x (1+X/R)x(RB + RCT +RL+Rr)
= 0.6 x6.85 x (1+19.14) x (0.04 + 3.1 + 1.88)
Vpeak
CT requirement for close-up fault condition: Vk3
>
Kmax x IFmax x (RB + RCT +RL+Rr)
= 1.4 x 63000/2000 x (0.04 + 3.1 + 1.88)
Vpeak
Since, the CT rated knee point voltage is greater than the calculated value, the proposed CT is adequate.
BAY NUMBER:
Sheet No.
ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
33 of 50
3-083300.01
PROJECT: ABU-HADRIYAH 380/115 kV BSP
DOCUMENT TITLE:
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.11 CT: 811 B1.C4
Protection
:
Metering
Core
:
CT: 811 B1.C4
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
0.2
VA Burden
50
VA
Thermal rating factor
200%
Application : Metering Burden Calculation (Refer Annexure-2) a
LCP Ammeter
b
3.2 VA
(Refer Annex-2, Sh. No. 8)
Mosaic panel Watt transducer, , AREVA, ISTAT300 Var transducer, AREVA, ISTAT300
d
(Assumed)
Energy metering panel NEXUS/1262
c
0.5 VA
1 VA
(Refer Annex-2, Sh. No. 13)
1 VA
(Refer Annex-2, Sh. No. 13)
Watt meter, PML ION6200
0.5 VA
(Assumed)
Var meter PML ION6200
0.5 VA
(Assumed)
DSM
0.1 VA
(Assumed)
Cabling loop (500 meters) For 4 sq.mm copper cable, RL= 0.00461 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)); Consider length of wire = 500 meters.
RL
=
2.812 Ohms
2RL
=
5.624 VA
Total connected burden, PBC =
12.42 VA
Considering 25% safe margin, connected VA equals to=
15.53 VA
CT Rated burden = 50VA
The total connected burden is less than the CT rated burden i.e 50VA. Hence the CT is adequate.
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ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
34 of 50
3-083300.01
PROJECT: ABU-HADRIYAH 380/115 kV BSP
DOCUMENT TITLE:
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.12 CT: 811 B2.C4
Protection
:
Metering
Core
:
CT: 811 B2.C4
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
0.2
VA Burden
50 VA
Thermal rating factor
200%
Application : Metering CT calculation same as CT: 810 B1.C4. Refer above CT: 810 B1.C4 for detailed calculation.
2.13 CT: 811 B2.C3
Protection
:
OHL feeder protn. -Set-2 (87L-2,21-2)
Core
:
CT: 811 B2.C3
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms <
3.1 Ohms at 2000A tap.
Knee point voltage, Vk
Vk >
3700 V at 2000A tap
CT excitation current at 2000A tap in mA
Ie <
75
Thermal rating factor
200%
Application : OHL feeder protection - Set-2 (87L-2,21-2) Relay Type/make : ''7SA522", Siemens. CT calculation same as CT: 810 B1.C3. Refer above CT: 810 B1.C3 for detailed calculation.
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35 of 50
3-083300.01
PROJECT: ABU-HADRIYAH 380/115 kV BSP
DOCUMENT TITLE:
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.14 CT: 811 B2.C2
Protection
:
OHL feeder protn. Set-1 (87L-1,21-1)
Core
:
CT: 811 B2.C2
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms <
3.1 Ohms at 2000A tap.
Knee point voltage, Vk
Vk >
3700 V at 2000A tap
CT excitation current at 2000A tap in mA
Ie <
75
Thermal rating factor
200%
Application : OHL feeder protection Set-1 (87L-1,21-1) Relay Type / Make: "REL 531", ABB CT calculation same as CT: 810 B1.C2. Refer above CT: 810 B1.C2 for detailed calculation.
2.15 CT: 811 B2.C1
Protection
:
spare
Core
:
CT: 811 B2.C1
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms <
4.65 Ohms at 3000A tap.
Knee point voltage, Vk
Vk >
5550 V at 3000A tap
CT excitation current at 3000A tap in mA
Ie <
50
Thermal rating factor
200%
Application : spare
BAY NUMBER:
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ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
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3-083300.01
PROJECT: ABU-HADRIYAH 380/115 kV BSP
DOCUMENT TITLE:
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.16 CT: 812 F.C1
Protection
:
Bus-bar protection (87M1)
Core
:
CT: 812 F.C1
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms <
4.65 Ohms at 3000A tap.
Knee point voltage, Vk
Vk >
5550 V at 3000A tap
CT excitation current at 3000A tap in mA
Iex <
50
Thermal rating factor
200%
NOTE: Typical bus-bar protection CT's core detail for adjacent cross bay's(3 nos. including future bays) are shown below.
Protection
:
Bus-bar protection (87M1)
Core
:
Core 1
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms
<
4.65 Ohms at 3000A tap.
Knee point voltage, Vk
Vk >
5550 V at 3000A tap
CT excitation current at 3000A tap in mA
Ie <
50
Thermal rating factor
200%
Application : Bus-Bar Protection-Main-1 (87M1) Relay Type / Make: "MCAG 14", AREVA (Setting range: 20%-80% of 1A) CT calculation same as above for 87M1. Refer above CT: 810 F.C1 for detailed calculation.
BAY NUMBER:
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3-083300.01
PROJECT: ABU-HADRIYAH 380/115 kV BSP
DOCUMENT TITLE:
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.17 CT: 812 F.C2
Protection
:
Bus-bar protection (87M2)
Core
:
CT: 812 F.C2
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms <
4.65 Ohms at 3000A tap.
Knee point voltage, Vk
Vk >
5550 V at 3000A tap
CT excitation current at 3000A tap in mA
Iex <
50
Thermal rating factor
200%
NOTE: Typical bus-bar protection CT's core detail for adjacent cross bay's(3 nos. including future bays) are shown below.
Protection
:
Bus-bar protection (87M2)
Core
:
Core 2
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms
<
4.65 Ohms at 3000A tap.
Knee point voltage, Vk
Vk >
5550 V at 3000A tap
CT excitation current at 3000A tap in mA
Ie <
50
Thermal rating factor
200%
Application : Bus-Bar Protection-Main-2 (87M2) Relay Type / Make: "MFAC 14", AREVA (Setting range: 25V-325V) CT calculation same as above CT: 810 F.C2. Refer above CT: 810 F.C2 for detailed calculation.
BAY NUMBER:
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ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
38 of 50
3-083300.01
PROJECT: ABU-HADRIYAH 380/115 kV BSP
DOCUMENT TITLE:
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.18 CT: 812 F.C3
Protection
:
Spare
Core
:
CT: 812 F.C3
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms
<
4.65 Ohms at 3000A tap.
Knee point voltage, Vk
Vk >
5550 V at 3000A tap
CT excitation current at 3000A tap in mA
Iex <
50
Thermal rating factor
200%
Application: Spare
BAY NUMBER:
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ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
39 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.19 CT: 812 B2.C4
Protection
:
Metering
Core
:
CT: 812 B2.C4
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
0.2
VA Burden
50
Thermal rating factor
200%
VA
Application : Metering CT calculation same as CT: 811 B1.C4. Refer above CT: 811 B1.C4 for detailed calculation.
2.20 CT: 812 B2.C3
Protection
:
OHL feeder protn. -Set-2 (87L-2,21-2)
Core
:
CT: 812 B2.C3
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms
<
3.1 Ohms at 2000A tap.
Knee point voltage, Vk
Vk >
3700 V at 2000A tap
CT excitation current at 2000A tap in mA
Ie <
75
Thermal rating factor
200%
Application : OHL feeder protection - Set-2 (87L-2,21-2) Relay Type/make : ''MiCOM P546", Areva. CT calculation same as CT: 811 B1.C3. Refer above CT: 811 B1.C3 for detailed calculation.
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CROSS BAY C4
40 of 50
3-083300.01
PROJECT: ABU-HADRIYAH 380/115 kV BSP
DOCUMENT TITLE:
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
2.21 CT: 812 B2.C2
Protection
:
OHL feeder protn. Set-1 (87L-1,21-1)
Core
:
CT: 812 B2.C2
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms ) <
3.1 Ohms at 2000A tap.
Knee point voltage, Vk
Vk >
3700 V at 2000A tap
CT excitation current at 2000A tap in mA
Ie <
75
Thermal rating factor
200%
Application : OHL feeder protection Set-1 (87L-1,21-1) Relay Type / Make: "RED 670", ABB CT calculation same as CT: 811 B1.C2. Refer above CT: 811 B1.C2 for detailed calculation.
2.22 CT: 812 B2.C1
Protection
:
BF protection (50BF)
Core
:
CT: 812 B2.C1
CT Ratio
:
3000-2500-2000-1500-1250-1000-750 /1A
Class of Accuracy
:
TPS
CT Secondary resistance at 75º C, RCT ohms <
3.1 Ohms at 2000A tap.
Knee point voltage, Vk
Vk >
3700 V at 2000A tap
CT excitation current at 2000A tap in mA
Ie <
75
Thermal rating factor
200%
Application : CB Fail Protection (50BF) Relay Type / Make: "RAICA", ABB,(50BF) CT calculation same as CT: 810 B1.C1. Refer above CT: 810 B1.C1 for detailed calculation.
BAY NUMBER:
Sheet No.
ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
41 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
380kV VT SIZING CALCULATION
3
3.1 VT LEAD RESISTANCE CALCULATION : VT secondary lead size considered is 4 sq.mm. 4 sq.mm copper cable resistance at 200C is 4.61 ohms/km.i.e Rdc at 200C = 4.61 ohm/km Rdc at 75ºC = R20(1+α20(T2-T1)); α at 20ºC = 0.004,Where α= temperature co-efficient of resistance. Hence, Rdc at 75ºC = 4.61(1+0.004(75-20)); =
5.62
ohm/km
Consider a distance from 380kV GIS CT to relay panel as per layout attached with considerable safe margin = 500 meter, Lead resistance calculated is, =
5.62 x 0.5
=
2.81
ohms for 500 meters
380kV ABU HADRIYAH- MANIFA LINE-2 CCVT Details : Core-1
Core-2
380kV/√3/110V/√3-110V
380kV/√3/110V/√3-110V
Class
:
0.2/3P
0.2/3P
VA Burden
:
100
100
Vector group :
Star-Star
Star-Star
Voltage Factor :
1.2 Cont.,
1.2 Cont.,
1.9 for 30 sec
1.9 for 30 sec
VT Ratio
:
Calculation of VT burden : Calculation of Lead burden: RL
= Lead resistance of wire.
For 4 sq.mm copper cable, RL= 0.00461 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)), RL=
2.81
Calculation of Lead current at rated burden :(IVT) =
ohms
0.1939 Amperes
Lead current is calculated considering Total VA burden. Hence, Lead current calculated =100/63.5 RB= Lead burden, 2xRLx (IVT^2)
0.19
= =
Amperes 0.2112 VA
RB= (2 x 2.81 x 0.1939 x 0.1939)
BAY NUMBER:
Sheet No.
ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
42 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
Core-1 : Relays / Instruments
Relay type Quantity Unit burden
Total burden (VA)
FFR (98L) A811/A812
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
Line set-1 protection
RED670
1
0.1
0.1
(Annexure-2 Sh. No.2)
Transient Fault Recorder
TR2000
1
0.01
0.01
(Annexure-2 Sh. No.7)
FFR (98) (Meas.) for set-1 protection
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98) (Ref.) for set-2 protection
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98) (Ref.) for Energy meter
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98L2) (Ref.) for 25AR
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
1
0.2
0.2
1
2
2
DSM FFR (98) 25AR/A811 FOR AF-2
RXBA 4
Total VA
=
Hence, total required burden of VT (Meters/relays plus lead burden)
=
Assumed (Annexure-2 Sh. No.9)
12.31
VA per phase
12.52
VA
.= (VA Connected + VA Lead) The Burden calculated considering 25% safety margin =
15.7
VA
Since, the connected burden is less than 100VA,the VT burden is adequate.
BAY NUMBER:
Sheet No.
ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
43 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
Core-2: Relays / Instruments
Relay type
Quantity Unit burden
Total burden (VA)
25MC/A811
KVAS100
1
0.02
0.02
(Annexure-2 Sh. No.10)
25MC/A812
KVAS100
1
0.02
0.02
(Annexure-2 Sh. No.10)
FFR (98L) (Meas.) A811/A812
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98) (Ref.) for set-1 protection
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98) (Meas.) for 67N-2
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
MICOMP546
1
0.02
0.02
(Annexure-2 Sh. No.3)
25AR / A812
KVAS100
1
0.02
0.02
(Annexure-2 Sh. No.10)
25AR / A811
KVAS100
1
0.02
0.02
(Annexure-2 Sh. No.10)
FFR (98L2) (Meas.) / 25AR
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98B2) (Meas.) / A812
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98) (Meas.) / A811
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
25AR / A811 FOR AF-2
KVAS100
1
0.02
0.02
(Annexure-2 Sh. No.10)
(27L2), Under voltage relay
RAEDA1
3
4.4
13.2
(Annexure-2 Sh. No. 11)
Voltage transducer for SCADA
ISTAT300
1
0.1
0.1
(Annexure-2 Sh. No. 13)
Watt meter Watt transducer for SCADA
ISTAT300
1
0.1
0.1
(Annexure-2 Sh. No. 13)
Var meter Var transducer for SCADA
ISTAT300
1
0.1
0.1
(Annexure-2 Sh. No. 13)
Voltmeter, PML
ION6200
1
0.5
0.5
Assumed
Wattmeter, PML
ION6200
1
0.5
0.5
Assumed
VARmeter, PML
ION6200
1
0.5
0.5
Assumed
Nexus/1262
1
5+3.2
8.2
(Annexure-2 Sh. No. 8)
Under voltage relay
RAEDA1
1
4.4
4.4
(Annexure-2 Sh. No. 11)
FFR (98) (Meas.) for revenue meter
RXBA 4
1
2
2
Under voltage relay
RAEDA1
1
4.4
4.4
(Annexure-2 Sh. No. 11)
Voltmeter
ION6200
1
0.5
0.5
Assumed
Line set-2 protection
Transducer Panel
Energy metering panel Energy meter
(Annexure-2 Sh. No.9)
LCP
Total VA
=
Hence, total required burden of VT (Meters/relays plus lead burden)
=
46.62
VA per phase
46.83
VA
.= (VA Connected + VA Lead) The Burden calculated considering 25% safety margin =
58.5
VA
Since, the connected burden is less than 100VA,the provided VT burden is adequate.
BAY NUMBER:
Sheet No.
ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
44 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
3.3 380kV ABU HADRIYAH- AL-FADHILI LINE-2 CCVT Details : Core-1
Core-2
380kV/√3/110V/√3-110V
380kV/√3/110V/√3-110V
Class
:
0.2/3P
0.2/3P
VA Burden
:
100
100
Vector group :
Star-Star
Star-Star
Voltage Factor :
1.2 Cont.,
1.2 Cont.,
1.9 for 30 sec
1.9 for 30 sec
VT Ratio
:
Calculation of VT burden : Calculation of Lead burden: RL
= Lead resistance of wire.
For 4 sq.mm copper cable, RL= 0.00461 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)), RL=
2.81
Calculation of Lead current at rated burden :(IVT) =
ohms
0.1954 Amperes
Lead current is calculated considering Total VA burden. Hence, Lead current calculated =100/63.5 RB= Lead burden, 2xRLx (IVT^2)
0.20
= =
Amperes 0.2147 VA
RB= (2 x 2.81 x 0.1954 x 0.1954)
Core-1 : Relays / Instruments
Relay type
Quantity Unit burden
Total burden (VA)
FFR 98-25AR/A811 FOR MAIN-2
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
Line set-1 protection
REL 531
1
0.2
0.2
(Annexure-2 Sh. No.15)
Transient Fault Recorder
TR2000
1
0.01
0.01
(Annexure-2 Sh. No.7)
FFR (98) (Meas.) for 67N-1
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98) (Ref.) for 67N-2
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98) (Ref.) for Energy meter
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98L2) (Ref.) for 25AR
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
1
0.2
0.2
1
2
2
DSM FFR (98L) (Ref.) for 25MC 810
RXBA 4
Total VA
=
Hence, total required burden of VT (Meters/relays plus lead burden)
=
Assumed (Annexure-2 Sh. No.9)
12.41
VA per phase
12.62
VA
.= (VA Connected + VA Lead) The Burden calculated considering 25% safety margin =
15.8
VA
Since, the connected burden is less than 100VA,the VT burden is adequate.
BAY NUMBER:
Sheet No.
ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
45 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
Core-2: Relays / Instruments
Relay type
Quantity Unit burden
Total burden (VA)
25MC/A811
RASC
1
0.25
0.25
(Annexure-2 Sh. No.17)
25MC/A810
RASC
1
0.25
0.25
(Annexure-2 Sh. No.17)
FFR (98L) (Meas.) A810/A811
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98) (Ref.) for 67N-1
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98) (Meas.) for 67N-2
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
Line set-2 protection
7SA522
1
0.1
0.1
(Annexure-2 Sh. No.16)
25AR / A810
RASC
1
0.25
0.25
(Annexure-2 Sh. No.17)
25AR / A811 FOR MAIN-2
RASC
1
0.25
0.25
(Annexure-2 Sh. No.17)
27-L2 Under voltage relay
RAEDA1
3
4.4
13.2
(Annexure-2 Sh. No. 11)
FFR (98B1) (Meas.) /A810
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
Voltage transducer for SCADA
ISTAT300
1
0.1
0.1
(Annexure-2 Sh. No.13)
Watt meter Watt transducer for SCADA
ISTAT300
1
0.1
0.1
(Annexure-2 Sh. No.13)
Var meter Var transducer for SCADA
ISTAT300
1
0.1
0.1
(Annexure-2 Sh. No.13)
Voltmeter
PML
1
0.5
0.5
Assumed
Wattmeter
PML
1
0.5
0.5
Assumed
VARmeter
PML
1
0.5
0.5
Assumed
Revenue meter
ELESTER
1
0.0173
0.0173
(Annexure-2 Sh. No. 18)
Under voltage relay
RAEDA1
1
4.4
4.4
(Annexure-2 Sh. No. 11)
FFR (98) (Meas.) for revenue meter
RXBA 4
1
2
2
FVS-UDC12
1
4.4
4.4
Assumed
PML
1
0.5
0.5
Assumed
Transducer Panel
Revenue metering panel
(Annexure-2 Sh. No.9)
LCP Under voltage relay Voltmeter
Total VA
=
Hence, total required burden of VT (Meters/relays plus lead burden)
=
35.42
VA per phase
35.63
VA
.= (VA Connected + VA Lead) The Burden calculated considering 25% safety margin =
44.5
VA
Since, the connected burden is less than 100VA,the provided VT burden is adequate.
BAY NUMBER:
Sheet No.
ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
46 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
3.4 380kV BUS1-VT
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
(Refer Annexure-4A)
VT Details : Core-1
Core-2
380kV/√3/110V/√3-110V
380kV/√3/110V/√3-110V
Class
:
0.2/3P
0.2/3P
VA Burden
:
100
100
Vector group :
Star-Star
Star-Star
Voltage Factor :
1.2 Cont.,
1.2 Cont.,
1.9 for 30 sec
1.9 for 30 sec
VT Ratio
:
Calculation of VT burden : Calculation of Lead burden: RL
= Lead resistance of wire.
For 4 sq.mm copper cable, RL= 0.00461 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)), RL=
2.81
Calculation of Lead current at rated burden :(IVT) =
ohms
0.0945 Amperes
Lead current is calculated considering Total VA burden. Hence, Lead current calculated =100/63.5 RB= Lead burden, 2xRLx (IVT^2)
0.09
= =
Amperes 0.0502 VA
RB= (2 x 2.81 x 0.0945 x 0.0945)
Core-1 : Relays / Instruments
Relay type
Quantity Unit burden
Total burden (VA)
FFR (98B1) (Meas.) 25AR/810
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98B1) (Meas.) 25AR/807
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98B1)-25MC/A810
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
Total VA
=
Hence, total required burden of VT (Meters/relays plus lead burden)
=
6 VA per phase 6.05 VA
.= (VA Connected + VA Lead) Considering 25% safety margin for any additional FFR relay required. The Burden calculated considering 25% safety margin =
7.6
VA
Since, the connected burden is less than 100VA,the VT burden is adequate.
BAY NUMBER:
Sheet No.
ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
47 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
Core-2: Relays / Instruments
Relay type
Quantity Unit burden
Total burden (VA)
25MC/A804
RASC
1
0.25
0.25
(Annexure-2 Sh. No.17)
25MC/A807
KVAS100
1
0.02
0.02
(Annexure-2 Sh. No.10)
25MC/A810
RASC
1
0.25
0.25
(Annexure-2 Sh. No.17)
98B1-25MC/810
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
98B1-25AR/807
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
98B1-25AR/810
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
25AR / A807
RASC
1
0.25
0.25
(Annexure-2 Sh. No.17)
25AR / A810
RASC
1
0.25
0.25
(Annexure-2 Sh. No.17)
TR2000
1
0.01
0.01
(Annexure-2 Sh. No.7)
1
0.2
0.2
Assumed
ISTAT300
1
0.1
0.1
(Annexure-2 Sh. No.13)
PML
1
0.5
0.5
Assumed
PML
1
0.5
0.5
Assumed
Transient Fault Recorder DSM Transducer panel Voltage transducer for SCADA Voltmeter LCC Voltmeter Total VA
=
Hence, total required burden of VT (Meters/relays plus lead burden)
=
8.33 VA per phase 8.38 VA
.= (VA Connected + VA Lead) Considering 25% safety margin for any additional FFR relay required. The Burden calculated considering 25% safety margin =
10.5
VA
Since, the connected burden is less than 100VA,the provided VT burden is adequate.
BAY NUMBER:
Sheet No.
ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
48 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
3.5 380kV BUS2-VT VT Details :
(Refer Annexure-4A) Core-1
Core-2
380kV/√3/110V/√3-110V
380kV/√3/110V/√3-110V
Class
:
0.2/3P
0.2/3P
VA Burden
:
100
100
Vector group :
Star-Star
Star-Star
Voltage Factor :
1.2 Cont.,
1.2 Cont.,
1.9 for 30 sec
1.9 for 30 sec
VT Ratio
:
Calculation of VT burden : Calculation of Lead burden: RL
= Lead resistance of wire.
For 4 sq.mm copper cable, RL= 0.00461 ohm/meter at 20ºC. α at 20ºC = 0.004, RL at 75ºC = RL(1+α20(T2-T1)), RL=
2.81
Calculation of Lead current at rated burden :(IVT) =
ohms
0.0945 Amperes
Lead current is calculated considering Total VA burden. Hence, Lead current calculated =100/63.5 RB= Lead burden, 2xRLx (IVT^2)
0.09
= =
Amperes 0.0502 VA
RB= (2 x 2.81 x 0.0945 x 0.0945)
Core-1 : Relays / Instruments
Relay type
Quantity Unit burden
Total burden (VA)
FFR (98B2) (Meas.) 25AR/806
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98B2) (Meas.) 25AR/812
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
FFR (98B2)-25MC/A812
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
Total VA
=
Hence, total required burden of VT (Meters/relays plus lead burden)
=
6 VA per phase 6.05 VA
.= (VA Connected + VA Lead) Considering 25% safety margin for any additional FFR relay required. The Burden calculated considering 25% safety margin =
7.6
VA
Since, the connected burden is less than 100VA,the VT burden is adequate.
BAY NUMBER:
Sheet No.
ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
49 of 50
3-083300.01
PROJECT:
DOCUMENT TITLE:
ABU-HADRIYAH 380/115 kV BSP
DOCUMENT NUMBER:
380 kV CT/VT SIZING CALCULATION
EA-086959
Core-2: Relays / Instruments
Relay type
Quantity Unit burden
Total burden (VA)
25MC/A806
RASC
1
0.25
0.25
(Annexure-2 Sh. No.17)
25MC/A809
RASC
1
0.25
0.25
(Annexure-2 Sh. No.17)
25MC/A812
KVAS100
1
0.02
0.02
(Annexure-2 Sh. No.10)
98B2-25MC/812
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
98B2-25AR/806
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
98B2-25AR/812
RXBA 4
1
2
2
(Annexure-2 Sh. No.9)
25AR / A806
RASC
1
0.25
0.25
(Annexure-2 Sh. No.17)
25AR / A812
KVAS100
1
0.02
0.02
(Annexure-2 Sh. No.10)
TR2000
1
0.01
0.01
(Annexure-2 Sh. No.7)
1
0.2
0.2
Assumed
ISTAT300
1
0.1
0.1
(Annexure-2 Sh. No.13)
PML
1
0.5
0.5
Assumed
PML
1
0.5
0.5
Assumed
Transient Fault Recorder DSM Transducer panel Voltage transducer for SCADA Voltmeter LCC Voltmeter Total VA
=
Hence, total required burden of VT (Meters/relays plus lead burden)
=
8.1 VA per phase 8.15 VA
.= (VA Connected + VA Lead) Considering 25% safety margin for any additional FFR relay required. The Burden calculated considering 25% safety margin =
10.2
VA
Since, the connected burden is less than 100VA,the provided VT burden is adequate.
BAY NUMBER:
Sheet No.
ABU-HADRIYAH CONTRACT No.
CROSS BAY C4
50 of 50
3-083300.01
ANNEXURE-1 CT requirements of relay Sr No.
Description
Make
Type
Page No.
1
Line differential protection main-1
ABB
RED670
2
2
Line differential protection main-2
AREVA
MICOMP546
5
3
Busbar differential protection
AREVA
MCAG14
8
4
Busbar differential protection
AREVA
MFAC14
11
5
CT circuit supervision relay
AREVA
MVTP11
15
6
Breaker failure protection relay
ABB
RAICA
16
7
Transient fault recorder
ROCHESTER
TR2000
17
8
Line differential protection main-1
ABB
REL531
20
9
Line differential protection main-2
SIEMENS
7SA522
24
Annexure-: CT Requirement of Relay
Page 1
Annexure-: CT Requirement of Relay
Page 2
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Page 4
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Page 7
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Page 9
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Page 23
Annexure-: CT Requirement of Relay
Page 24
ANNEXURE-2 VA burden requirements of relay Sr No.
Description
Make
Type
Page No.
1
Line differential protection main-1
ABB
RED670
2
2
Line differential protection main-2
AREVA
MICOMP546
3
3
Busbar differential protection
AREVA
MCAG4
4
4
CT circuit supervision relay
AREVA
MVTP11
5
5
Breaker failure protection relay
ABB
RAICA
6
6
Transient fault recorder
ROCHESTER
TR2000
7
7
Energy Meter
Electro Ind.
NEXUS1262
8
8
Fuse failure relay
ABB
RXBA4
9
9
Synchro check relay
AREVA
KVAS100
10
10
Undervoltage relay
ABB
RAEDA1
11
11
Line differential protection main-1
ABB
REL531
12
12
Transducer
AREVA
ISTAT300
13
13
Line differential protection main-1
ABB
REL531
14
14
Line differential protection main-2
SIEMENS
7SA522
16
15
Synchro check relay
ABB
RASC
17
16
Revenue Meter
ELSTER
A3 ALPHA
18
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ANNEXURE-3 SAUDI CABLE CATALOGUE
ANNEXURE-4 380kV GIS CT DATA
Ref.No. NA40034NA40034-D020 Date : 9 May, May, 2006 Rev.2 5 Aug. 2009 Rev.3 12 Aug.,2009 Rev.4 18 Aug.,2009
TECHNICAL SPECIFICATION FOR CT
Project : Contract No. : Specification :
New 380/115kV ABU HADRIYAH BSP 30531099/00 380kV 63kA 3150/2000A GIS
1. Applicable Standard - IEC 60044-1, IEC 60044-6 2. Ratings - Symmetric short circuit (Ith) : 63kA rms - Dynamic short circuit (Idyn) : 163.8kA peak - Continuous thermal current rating factor : 2.0
1) GCB A810 Specification Location
Current Ratio
Adopted
Class
Ual
Side
Side
Burden
Kssc
K
Rb
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