Cable Sizing Cwph

TCE CONSULTING ENGINEERS LIMITED TCE-M2-EL-CA-D-2160

CABLE SIZING CALCULATIONS

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BHAVANAGAR ENERGY COMPANY LIMITED, BHAVANAGAR 2 X 250 MW TPP CABLE SIZING CALCULATIONS

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TCE FORM 020 R0

By

KYP

Project

TATA CONSULTING ENGINEERS LIMITED

Date 22.07.2010 Chkd.GBK

Client

BECL, BHAVANAGAR

Date

Job No. 5403A

Office DB

2 X 250 MW TPP

Doc No. Subject

Dept.

EL

CABLE SIZING

Sh. No.

1

of

2 Rev. No.

0

CABLE SIZING CALCULATION (6.6 kV H.V SIDE) REMARKS

1 FEEDER DATA 1.1 Incoming / Outgoing & Designation

Incoming

1.2 Rating, 3 PH

kVA

1.3 Voltage

kV

12000 6.600

1.4 Power Factor (p.f)

0.8

1.5 Efficiency (Effy)

0.9 Earthed / Unearthed (Amp.)

1.6 Type of Earthing 1.7

(a) Current IFL

kVA

1049.73

3 * kV kW (Motor)

(b) Current IFL

Solidly Earthed.

(Amp.)

3 * kV * Effy. * p.f 1.8 Type of Protection (CB / Fuse / MCB / MCCB)

CB

1.9 (a) 3 Phase - Fault Current (Ish)

kA

40

(b) Fault Clearing Time (t)

( Secs)

0.5

1.10 Estimated Length (L)

m

500

1.11 Permissible Voltage drop (a) Running

%

5

%

15

(b) Starting 2 LAYING CONDITIONS

2.1 Ambient Temperature

Tray/

Buried

Trench/

in

Air

ground

Deg. C

Refer TCE design guide

Duct

Derating

Refer cable

Factor

catalogue.

45

0.86 1.00

2.2 Grouping / Spacing with other cables

1

2.3 Thermal Resistivity

Deg.C cm /W

200

2.4 Depth of Burial

mm

750

2.5 Overall Derating Factor

ODF

Value of k (Amp./ sq.mm)

3 TYPE OF CABLE TO BE USED (To be

1.00 0.860

Marked)

Al (Cond.)

Cu (Cond.)

3.1 PVC

75

112

3.2 XLPE (a) 22 / 33 kV

94

140

(b) 11 kV

94

140

(c) 6.6 kV

94

140

(d) 415V

94

140

3.3

4 CABLE SIZING 4.1 Based on Full Load Current (a) Cable rating required

(I / ODF)

1220.61

Amp.

(b) Cable for above rating

Type XLPE 1 CORE

Size (Sq.mm.) No.of runs 800

4.2 Based on Short Circuit Current (For breaker protected feeders only) (a)

Ish * t k

= Area of cond.

Sq. mm 300.897

2

For Contactor Controlled Feeder (b) (HT only) I2t of cable chosen shall be 1.5*I2t of associated fuse

Sq. mm

4.3 Estimated Cable Size ( Higher of 4.1 & 4.2 )

Sq. mm

-

400 5 CHECK FOR VOLTAGE DROP 5.1 Cable Size 5.2 R (at cond. temp) X  5.3

5.4

3 * I FL ( R Cos + X Sin ) * L kV*10000

800

Sq. mm ohm/ph./kM

0.047

ohm/ph./kM

0.091

Load Angle

36.86

% Drop 0.635

3 * ISTG ( R Cos + X Sin  ) * L % Drop kV*10000

(Refer Note - 1 below) 5.5 Is the voltage drop within permissible limits? (If not select higher size of cable and check for voltage drop) Cable Size considering Voltage 5.6 Drop 6.0 RECOMMENDED CABLE SIZE (Higher of 4.3 and 5.6)

4.572 Yes / No YES Sq. mm Type XLPE 1 CORE

NOTE: 1) Load angle shall correspond to starting condition of Motor.

800 Size (Sq.mm) No. of Runs 800

2

By

KYP

Project

TATA CONSULTING ENGINEERS LIMITED

Date 22.07.2010 Chkd.GBK

Client

BECL, BHAVANAGAR

Date

Job No. 5403A

Office DB

2 X 250 MW TPP

Doc No. Subject

Dept.

EL

CABLE SIZING

Sh. No.

1

of

2 Rev. No.

0

CABLE SIZING CALCULATION (6.6 kV H.V SIDE) REMARKS

1 FEEDER DATA 1.1 Incoming / Outgoing & Designation

Incoming

1.2 Rating, 3 PH

kVA

1.3 Voltage

kV

2500 6.600

1.4 Power Factor (p.f)

0.8

1.5 Efficiency (Effy)

0.9 Earthed / Unearthed (Amp.)

1.6 Type of Earthing 1.7

(a) Current IFL

kVA

218.69

3 * kV kW (Motor)

(b) Current IFL

Solidly Earthed.

(Amp.)

3 * kV * Effy. * p.f 1.8 Type of Protection (CB / Fuse / MCB / MCCB)

CB

1.9 (a) 3 Phase - Fault Current (Ish)

kA

40

(b) Fault Clearing Time (t)

( Secs)

0.16

1.10 Estimated Length (L)

m

50

1.11 Permissible Voltage drop (a) Running

%

5

%

15

(b) Starting 2 LAYING CONDITIONS

2.1 Ambient Temperature

Tray/

Buried

Trench/

in

Air

ground

Deg. C

Refer TCE design guide

Duct

Derating

Refer cable

Factor

catalogue.

45

0.86 1.00

2.2 Grouping / Spacing with other cables

1

2.3 Thermal Resistivity

Deg.C cm /W

200

2.4 Depth of Burial

mm

750

2.5 Overall Derating Factor

ODF

Value of k (Amp./ sq.mm)

3 TYPE OF CABLE TO BE USED (To be

1.00 0.860

Marked)

Al (Cond.)

Cu (Cond.)

3.1 PVC

75

112

3.2 XLPE (a) 22 / 33 kV

94

140

(b) 11 kV

94

140

(c) 6.6 kV

94

140

(d) 415V

94

140

3.3

4 CABLE SIZING 4.1 Based on Full Load Current (a) Cable rating required

(I / ODF)

254.29

Amp.

(b) Cable for above rating

Type XLPE 3 CORE

Size (Sq.mm.) No.of runs 185

4.2 Based on Short Circuit Current (For breaker protected feeders only) (a)

Ish * t k

= Area of cond.

Sq. mm 170.213

1

For Contactor Controlled Feeder (b) (HT only) I2t of cable chosen shall be 1.5*I2t of associated fuse

Sq. mm

4.3 Estimated Cable Size ( Higher of 4.1 & 4.2 )

Sq. mm

-

185 5 CHECK FOR VOLTAGE DROP 5.1 Cable Size 5.2 R (at cond. temp) X  5.3

5.4

3 * I FL ( R Cos + X Sin ) * L kV*10000 3 * ISTG ( R Cos + X Sin  ) * L kV*10000

(Refer Note - 1 below) 5.5 Is the voltage drop within permissible limits? (If not select higher size of cable and check for voltage drop) Cable Size considering Voltage 5.6 Drop 6.0 RECOMMENDED CABLE SIZE (Higher of 4.3 and 5.6)

Sq. mm

185

ohm/ph./kM

0.21

ohm/ph./kM

0.0969

Load Angle

36.86

% Drop 0.065 % Drop Yes / No YES Sq. mm Type XLPE 3 CORE

NOTE: 1) Load angle shall correspond to starting condition of Motor.

185 Size (Sq.mm) No. of Runs 185

1

By

KYP

Project

TATA CONSULTING ENGINEERS LIMITED

Date 22.07.2010 Chkd.GBK

Client

BECL, BHAVANAGAR

Date

Job No. 5403A

Office DB

2 X 250 MW TPP

Doc No. Subject

Dept.

EL

CABLE SIZING

Sh. No.

1

of

2 Rev. No.

0

CABLE SIZING CALCULATION (6.6 kV H.V SIDE) REMARKS

1 FEEDER DATA 1.1 Incoming / Outgoing & Designation

Incoming

1.2 Rating, 3 PH

kW

1.3 Voltage

kV

1500 6.600

1.4 Power Factor (p.f)

0.85

1.5 Efficiency (Effy)

0.95 Earthed / Unearthed (Amp.)

1.6 Type of Earthing 1.7

(a) Current IFL

kVA 3 * kV kW (Motor)

(b) Current IFL

Solidly Earthed.

(Amp.) 162.50

3 * kV * Effy. * p.f 1.8 Type of Protection (CB / Fuse / MCB / MCCB)

CB

1.9 (a) 3 Phase - Fault Current (Ish)

kA

40

(b) Fault Clearing Time (t)

( Secs)

0.16

1.10 Estimated Length (L)

m

50

1.11 Permissible Voltage drop (a) Running

%

5

%

15

(b) Starting 2 LAYING CONDITIONS

2.1 Ambient Temperature

Tray/

Buried

Trench/

in

Air

ground

Deg. C

Refer TCE design guide

Duct

Derating

Refer cable

Factor

catalogue.

45

0.86 1.00

2.2 Grouping / Spacing with other cables

1

2.3 Thermal Resistivity

Deg.C cm /W

200

2.4 Depth of Burial

mm

750

2.5 Overall Derating Factor

ODF

Value of k (Amp./ sq.mm)

3 TYPE OF CABLE TO BE USED (To be

1.00 0.860

Marked)

Al (Cond.)

Cu (Cond.)

3.1 PVC

75

112

3.2 XLPE (a) 22 / 33 kV

94

140

(b) 11 kV

94

140

(c) 6.6 kV

94

140

(d) 415V

94

140

3.3

4 CABLE SIZING 4.1 Based on Full Load Current (a) Cable rating required

(I / ODF)

188.95

Amp.

(b) Cable for above rating

Type XLPE 3 CORE

Size (Sq.mm.) No.of runs 95

4.2 Based on Short Circuit Current (For breaker protected feeders only) (a)

Ish * t k

= Area of cond.

Sq. mm 170.213

1

For Contactor Controlled Feeder (b) (HT only) I2t of cable chosen shall be 1.5*I2t of associated fuse

Sq. mm

4.3 Estimated Cable Size ( Higher of 4.1 & 4.2 )

Sq. mm

-

185 5 CHECK FOR VOLTAGE DROP 5.1 Cable Size 5.2 R (at cond. temp) X  5.3

5.4

3 * I FL ( R Cos + X Sin ) * L kV*10000 3 * ISTG ( R Cos + X Sin  ) * L kV*10000

(Refer Note - 1 below) 5.5 Is the voltage drop within permissible limits? (If not select higher size of cable and check for voltage drop) Cable Size considering Voltage 5.6 Drop 6.0 RECOMMENDED CABLE SIZE (Higher of 4.3 and 5.6)

Sq. mm

185

ohm/ph./kM

0.21

ohm/ph./kM

0.089

Load Angle

36.86

% Drop 0.047 % Drop 0.340 Yes / No YES Sq. mm Type XLPE 3 CORE

NOTE: 1) Load angle shall correspond to starting condition of Motor.

185 Size (Sq.mm) No. of Runs 185

3

By

KYP

Project

TATA CONSULTING ENGINEERS LIMITED

Date 22.07.2010 Chkd.GBK

Client

BECL, BHAVANAGAR

Date

Job No. 5403A

Office DB

2 X 250 MW TPP

Doc No. Subject

Dept.

EL

CABLE SIZING

Sh. No.

1

of

2 Rev. No.

0

CABLE SIZING CALCULATION (6.6 kV H.V SIDE) REMARKS

1 FEEDER DATA 1.1 Incoming / Outgoing & Designation

Incoming

1.2 Rating, 3 PH

kW

350

1.3 Voltage

kV

6.600

1.4 Power Factor (p.f)

0.85

1.5 Efficiency (Effy)

0.95 Earthed / Unearthed (Amp.)

1.6 Type of Earthing 1.7

(a) Current IFL

kVA 3 * kV kW (Motor)

(b) Current IFL

Solidly Earthed.

(Amp.) 37.92

3 * kV * Effy. * p.f 1.8 Type of Protection (CB / Fuse / MCB / MCCB)

CB

1.9 (a) 3 Phase - Fault Current (Ish)

kA

40

(b) Fault Clearing Time (t)

( Secs)

0.16

1.10 Estimated Length (L)

m

100

1.11 Permissible Voltage drop (a) Running

%

5

%

15

(b) Starting 2 LAYING CONDITIONS

2.1 Ambient Temperature

Tray/

Buried

Trench/

in

Air

ground

Deg. C

Refer TCE design guide

Duct

Derating

Refer cable

Factor

catalogue.

45

0.86 1.00

2.2 Grouping / Spacing with other cables

1

2.3 Thermal Resistivity

Deg.C cm /W

200

2.4 Depth of Burial

mm

750

2.5 Overall Derating Factor

ODF

Value of k (Amp./ sq.mm)

3 TYPE OF CABLE TO BE USED (To be

1.00 0.860

Marked)

Al (Cond.)

Cu (Cond.)

3.1 PVC

75

112

3.2 XLPE (a) 22 / 33 kV

94

140

(b) 11 kV

94

140

(c) 6.6 kV

94

140

(d) 415V

94

140

3.3

4 CABLE SIZING 4.1 Based on Full Load Current (a) Cable rating required

(I / ODF)

(b) Cable for above rating

44.09

Amp.

Ish * t k

= Area of cond. Type XLPE 3 CORE

Size (Sq.mm.) No.of runs 35

4.2 Based on Short Circuit Current (For breaker protected feeders only) (a)

Sq. mm 170.213

1

For Contactor Controlled Feeder (b) (HT only) I2t of cable chosen shall be 1.5*I2t of associated fuse

Sq. mm

4.3 Estimated Cable Size ( Higher of 4.1 & 4.2 )

Sq. mm

-

185 5 CHECK FOR VOLTAGE DROP 5.1 Cable Size 5.2 R (at cond. temp) X  5.3

5.4

Sq. mm

185

ohm/ph./kM

0.21

ohm/ph./kM

0.089

Load Angle

36.86

3 * I FL ( R Cos + X Sin ) * L % Drop kV*10000

0.022

3 * ISTG ( R Cos + X Sin  ) * L % Drop kV*10000

(Refer Note - 1 below) 5.5 Is the voltage drop within permissible limits? (If not select higher size of cable and check for voltage drop) Cable Size considering Voltage 5.6 Drop 6.0 RECOMMENDED CABLE SIZE (Higher of 4.3 and 5.6)

0.159 Yes / No YES Sq. mm Type XLPE 3 CORE

NOTE: 1) Load angle shall correspond to starting condition of Motor.

240 Size (Sq.mm) No. of Runs 185

1

By

KYP

Project

TATA CONSULTING ENGINEERS LIMITED

Date 22.07.2010 Chkd.GBK

Client

BECL, BHAVANAGAR

Date

Job No. 5403A

Office DB

Doc No. Subject

Dept.

EL

Sh. No.

CABLE SIZING CALCULATION (6.6 kV H.V SIDE) 1 FEEDER DATA 1.1 Incoming / Outgoing & Designation

Incoming

1.2 Rating, 3 PH

kVA

1.3 Voltage

kV

1200 0.415

1.4 Power Factor (p.f)

0.8

1.5 Efficiency (Effy)

0.9 Earthed / Unearthed (Amp.)

1.6 Type of Earthing 1.7 (a) Current IFL (b) Current IFL

kVA

Solidly Earthed. 1669.45

3 * kV kW (Motor)

(Amp.)

3 * kV * Effy. * p.f 1.8 Type of Protection (CB / Fuse / MCB / MCCB)

CB

1.9 (a) 3 Phase - Fault Current (Ish)

kA

50

( Secs)

0.16

1.10 Estimated Length (L)

m

500

1.11 Permissible Voltage drop (a) Running

%

5

%

15

(b) Fault Clearing Time (t)

(b) Starting 2 LAYING CONDITIONS

2.1 Ambient Temperature

Tray/

Buried

Trench/

in

Air

ground

Deg. C

Duct

45

2.2 Grouping / Spacing with other cables 2.3 Thermal Resistivity

Deg.C cm /W

200

2.4 Depth of Burial

mm

750

2.5 Overall Derating Factor

ODF

3 TYPE OF CABLE TO BE USED (To be

Marked)

Value of k (Amp./ sq.mm) Al (Cond.)

3.1 PVC

75

3.2 XLPE (a) 22 / 33 kV

94

3.3

(b) 11 kV

94

(c) 6.6 kV

94

(d) 415V

94

4 CABLE SIZING 4.1 Based on Full Load Current (a) Cable rating required

(I / ODF)

1854.94

Amp.

(b) Cable for above rating

Size (Sq.mm.)

Type XLPE 1 CORE

1000

4.2 Based on Short Circuit Current (For breaker protected feeders only) (a)

Ish * t k

= Area of cond.

Sq. mm 212.766

For Contactor Controlled Feeder (b) (HT only) I2t of cable chosen shall be 1.5*I2t of associated fuse

Sq. mm

4.3 Estimated Cable Size ( Higher of 4.1 & 4.2 )

Sq. mm

-

185 5 CHECK FOR VOLTAGE DROP 5.1 Cable Size 5.2 R (at cond. temp) X  5.3

5.4

3 * I FL ( R Cos + X Sin ) * L kV*10000

Sq. mm

800

ohm/ph./kM

0.0444

ohm/ph./kM

0.081

Load Angle

36.86

% Drop 2.931

3 * ISTG ( R Cos + X Sin  ) * L % Drop kV*10000

(Refer Note - 1 below) 5.5 Is the voltage drop within permissible limits? (If not select higher size of cable and check for voltage drop)

Yes / No YES

Cable Size considering Voltage Drop 6.0 RECOMMENDED CABLE SIZE (Higher of 4.3 and 5.6)

5.6

Sq. mm Type

185 Size (Sq.mm)

XLPE 3 CORE

185

NOTE: 1) Load angle shall correspond to starting condition of Motor.

2 X 250 MW TPP Doc No. Subject

CABLE SIZING 1

of

2 Rev. No.

0

REMARKS

00

y Earthed.

9.45

CB

0 Refer TCE design guide

16

00

5

5 Derating

Refer cable

Factor

catalogue.

0.90 1 1.00 1.00 0.900

Amp./ sq.mm) Cu (Cond.)

112 140 140 140 140

4.94

.766

-

85

No.of runs 10

No. of Runs 1

By

KYP

Project

TATA CONSULTING ENGINEERS LIMITED

Date 22.07.2010 Chkd.GBK

Client

BECL, BHAVANAGAR

Date

Job No. 5403A

Office DB

Doc No. Subject

Dept.

EL

Sh. No.

CABLE SIZING CALCULATION (6.6 kV H.V SIDE) 1 FEEDER DATA 1.1 Incoming / Outgoing & Designation

Incoming

1.2 Rating, 3 PH

kVA

1.3 Voltage

kV

11000 6.600

1.4 Power Factor (p.f)

0.8

1.5 Efficiency (Effy)

0.9 Earthed / Unearthed (Amp.)

1.6 Type of Earthing 1.7 (a) Current IFL (b) Current IFL

kVA

Solidly Earthed. 962.25

3 * kV kW (Motor)

(Amp.)

3 * kV * Effy. * p.f 1.8 Type of Protection (CB / Fuse / MCB / MCCB)

CB

1.9 (a) 3 Phase - Fault Current (Ish)

kA

40

( Secs)

0.5

1.10 Estimated Length (L)

m

500

1.11 Permissible Voltage drop (a) Running

%

5

%

15

(b) Fault Clearing Time (t)

(b) Starting 2 LAYING CONDITIONS

2.1 Ambient Temperature

Tray/

Buried

Trench/

in

Air

ground

Deg. C

Duct

45

2.2 Grouping / Spacing with other cables 2.3 Thermal Resistivity

Deg.C cm /W

200

2.4 Depth of Burial

mm

750

2.5 Overall Derating Factor

ODF

3 TYPE OF CABLE TO BE USED (To be

Marked)

Value of k (Amp./ sq.mm) Al (Cond.)

3.1 PVC

75

3.2 XLPE (a) 22 / 33 kV

94

3.3

(b) 11 kV

94

(c) 6.6 kV

94

(d) 415V

94

4 CABLE SIZING 4.1 Based on Full Load Current (a) Cable rating required

(I / ODF)

1118.90

Amp.

(b) Cable for above rating

Size (Sq.mm.)

Type XLPE 1 CORE

630

4.2 Based on Short Circuit Current (For breaker protected feeders only) (a)

Ish * t k

= Area of cond.

Sq. mm 300.897

For Contactor Controlled Feeder (b) (HT only) I2t of cable chosen shall be 1.5*I2t of associated fuse

Sq. mm

4.3 Estimated Cable Size ( Higher of 4.1 & 4.2 )

Sq. mm

-

400 5 CHECK FOR VOLTAGE DROP 5.1 Cable Size 5.2 R (at cond. temp) X  5.3

5.4

Sq. mm

630

ohm/ph./kM

0.06

ohm/ph./kM

0.093

Load Angle

36.86

3 * I FL ( R Cos + X Sin ) * L % Drop kV*10000

0.437

3 * ISTG ( R Cos + X Sin  ) * L % Drop kV*10000

(Refer Note - 1 below) 5.5 Is the voltage drop within permissible limits? (If not select higher size of cable and check for voltage drop)

Yes / No YES

Cable Size considering Voltage Drop 6.0 RECOMMENDED CABLE SIZE (Higher of 4.3 and 5.6)

5.6

Sq. mm Type

630 Size (Sq.mm)

XLPE 1 CORE

630

NOTE: 1) Load angle shall correspond to starting condition of Motor.

2 X 250 MW TPP Doc No. Subject

CABLE SIZING 1

of

2 Rev. No.

0

REMARKS

000

y Earthed.

2.25

CB

0 Refer TCE design guide

.5

00

5

5 Derating

Refer cable

Factor

catalogue.

0.86 1 1.00 1.00 0.860

Amp./ sq.mm) Cu (Cond.)

112 140 140 140 140

8.90

.897

-

00

No.of runs 3

No. of Runs 3