Frega Test Procedure

FREGA TEST PROCEDURE FOR DISTANCE RELAY OHMEGA RELAY 1. SELECT FREGA ICON

2. CLICK CONNECT THEN SELECT DISTANCE ICON

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3. FILL IFOMATION AND SELECT PROCED

4. WAITING SOME TIME UP TO LOADING

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5. SELECT CONFIG

6. SELECT FILE THEN NEW TEST WILL SET PREFAULT, MAX FAULT, ZONE TIME (3ZONES) AND CONFIG CONTACT ALSO CAN SELECT COLOUR

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7. SELECT RX RAMP

8. FROM FILE MENU SELECT NEW TEST THEN (IMPORT A REFERNCE GRAPH)

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9. TO CREATE GRAPH SELECT EDIT / CREATE A REFERANCE GRAPH

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10. Should be select circle or other chart according final setting, radius, angle, a and b(will come auto when a value enter) Then click save element , create zone this will give you the next zone after finish click file menu , save as , enter the name for your graph , click file menu then exit

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Important information about graph building:

In case of phase – phase graph building Take the radius = zone setting value /2 and the angle equal line angle • In case of phase – ground graph building Take the radius = zone setting value(1+K0) / 2 and the angle equal comp. Angle , K0= 1/3{(Z0/Z1)-1} REF. OHMEGA MANUAL - Chapter 2 -sheet (4,5) •

Must be Ke value and angle equal zero in configuration

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Example for 132/33 kv s/s 8903 hail al_khotta line M08 Setting from protection engineering division – central:

1- For testing Z1 By FREJA Tester line angle EF comp. Z0/Z1 ratio ZF comp. Angle Z1 PF impedance Z1 EF impedance

65 2.79 75 7.52 7.52

In freja software - graph building: For ph – ph Radius = Z1/2 = 7.52 / 2 = 3.76 radius a

3.76 0

Angle b

65 7.52

For ph – E K0= 1/3{(Z0/Z1)-1} = 1/3(2.79 – 1) = 0.6 Radius = Z1*(1+k0)/2 =6.016 radius a

6.016 0

Angle b

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75 12.032

2- For testing Z2 by FREJA Tester Setting from protection engineering division – central: line angle EF comp. Z0/Z1 ratio ZF comp. Angle Z2 PF impedance Z2 EF impedance

65 2.79 75 11.1 11.1

In freja software - graph building: For ph – ph Radius = Z2/2 = 11.1/ 2 = 5.55 radius 5.55 Angle a 0 b For ph – E K0= 1/3{(Z0/Z1)-1} = 1/3(2.79 – 1) = 0.6 Radius = Z2*(1+k0)/2 = 8.88 radius 8.88 Angle a 0 b

65 11.1

75 17.76

3- For testing Z3 by FREJA Tester Setting from protection engineering division – central: line angle 65 EF comp. Z0/Z1 ratio 2.79 ZF comp. Angle 75 Z3 type Offset MHO Z3 PF impedance (FWD) 22.2 Z3 PF impedance (Rev) 2.21 Z3 EF impedance (FWD) 22.2 Z3 EF impedance (Rev) 2.21

In freja software - graph building: For ph – ph Radius ={ Z3 (FWD) +Z3(Rev) } / 2 = (22.2 +2.21) / 2 = 12.205 radius 12.205 Angle 65 a 2.21 b 22.2 For ph – E K0= 1/3{(Z0/Z1)-1} = 1/3(2.79 – 1) = 0.65 Radius = {Z3 (FWD) +Z3(Rev)} * (1+K0) / 2 = 19.528 a= Z3 EF (Rev) (1+k0)=3.536 , b = Z3 EF (FWD) (1+k0)= = 35.52 radius 19.528 Angle 75 a 3.536 b 35.52

11. Adjust start, stop & step for your wanted No. of RAMP’S Then START

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Time reach In configuration screen adjust zone time tz1=0 , tz2=800msec. , tz3= 1.5 sec.

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Go to Zt screen Import your graph or you can make new graph like the zone reach graph

After finish ---- file – save as , file exit

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Select the phases and Click start after finish click report then print

Eng. Mohammed Deraz ThyssenKrupp Co.

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