Frega Test Procedure
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Transcript of Frega Test Procedure
FREGA TEST PROCEDURE FOR DISTANCE RELAYOHMEGA 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
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click file menu , save as , enter the name for your graph , click file menu then exit
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 M08Setting from protection engineering division – central : 1- For testing Z1 By FREJA Tester
line angle 65EF comp. Z0/Z1 ratio 2.79ZF comp. Angle 75Z1 PF impedance 7.52Z1 EF impedance 7.52
In freja software - graph building:For ph – ph Radius = Z1/2 = 7.52 / 2 = 3.76
radius 3.76 Angle 65a 0 b 7.52
For ph – EK0= 1/3{(Z0/Z1)-1} = 1/3(2.79 – 1) = 0.6 Radius = Z1*(1+k0)/2 =6.016
radius 6.016 Angle 75a 0 b 12.032
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2- For testing Z2 by FREJA TesterSetting from protection engineering division – central:
line angle 65EF comp. Z0/Z1 ratio 2.79ZF comp. Angle 75Z2 PF impedance 11.1Z2 EF impedance 11.1
In freja software - graph building:For ph – ph Radius = Z2/2 = 11.1/ 2 = 5.55
radius 5.55 Angle 65a 0 b 11.1
For ph – EK0= 1/3{(Z0/Z1)-1} = 1/3(2.79 – 1) = 0.6 Radius = Z2*(1+k0)/2 = 8.88
radius 8.88 Angle 75a 0 b 17.76
3- For testing Z3 by FREJA TesterSetting from protection engineering division – central:
line angle 65EF comp. Z0/Z1 ratio 2.79ZF comp. Angle 75Z3 type Offset MHOZ3 PF impedance (FWD) 22.2Z3 PF impedance (Rev) 2.21Z3 EF impedance (FWD) 22.2Z3 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 65a 2.21 b 22.2
For ph – EK0= 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 75a 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 screenImport your graph or you can make new graph like the zone reach graph
After finish ---- file – save as , file exit Select the phases and Click start after finish click report then print
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Eng. Mohammed Deraz ThyssenKrupp Co.
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