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This document outlines the methodology for calculating intermediate values of short-circuit impedance (Z1 and Z2) and short-circuit MVA across various buses within a SCADA system. The algorithm incorporates the effects of ZL and performs iterations to refine the results based on the line statuses. Utilizing data from SCADA files, it identifies the impact of bus conditions and computes short-circuit levels, providing a robust process for power system analysis. The finite element method is employed for devices connected to the bus, ensuring accurate and repeatable results.
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B5 Ld Ld G5001 T1001 G B3 B1 L3 L2 L4 L1 L5 B2 B4 T1002 G5002 G L B6
INITIAL CONDITION, ZSC1 & ZSC2 INCLUDES EFFECT OF ZL BUS 1 BUS 2 ZL ZSC1 Z SC2
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
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
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.
