T1001

1. B5 Ld Ld G5001 T1001 G B3 B1 L3 L2 L4 L1 L5 B2 B4 T1002 G5002 G L B6

2. BUS_CON.CFG (Fixed file)

3. DEV_IMP.CFG (Fixed file)

4. REAL TIME VALUES FROM SCADABUS_VOL.DAT

5. NSP OUTPUT FROM SCADA DEV_STS.DAT

6. INITIAL CONDITION, ZSC1 & ZSC2 INCLUDES EFFECT OF ZL BUS 1 BUS 2 ZL ZSC1 Z SC2

7. CALCULATE INTERMEDIATE VALUES OF Z1 & Z2 DURING ITERATION EXCLUDING EFFECT OF ZL Z1 & Z2 COMPUTED BY SOLVING THE FOLLOWING NON-LINEAR EQUATION (LOOKS SIMPLE – TRY SOLVING) ZSC1 = Z1 || ZL + Z2 ZSC2 = Z2 || ZL + Z1 WHERE ZSC1, ZSC2, ZL ARE KNOWN COMPLEX PART OF ALGORITHM BUS 1 BUS 2 ZL Z1 Z2

8. ITERATION RESULT, NEW ZSC1 IS COMPUTED INCLUDING THE EFFECT OF ZL DEPENDING UPON LINE STATUS. IF LINE STATUS IS De-Energised, NEW ZSC1=Z1 other wise NEW ZSC1 = Z1 || ZL + Z2 BUS 1 BUS 1 BUS 2 ZL Z SC1 Z1 Z2

9. INITIAL VALUES OF ALL BUS SHORT CIRCUIT IMPEDANCE ARE COMPARED WITH THE CALCULATED VALUES, ON REACHING THE TOLERANCES, COMPUTE SHORT CIRCUIT MVA OF EACH BUSES SHORT-CIRCUIT MVA = KV * KV / ZSC Z1 AND Z2 COMPUTATION IS TAKEN FOR LINE ONLY AS EXAMPLE. IN FINITE ELEMENT METHOD – THE PROCESS IS SAME and REPEATED FOR ALL DEVICES CONNECTED TO THE BUS.

10. SHORT-CIRCUIT LEVEL - TO SCADABUS_SCL.DAT