阻抗匹配平衡变压器牵引供电系统的短路分析

SHORT-CIRCUIT ANALYSIS FOR TRACTION POWER SUPPLY SYSTEM WITH IMPEDANCE-MATCHING BALANCE TRANSFORMERS

本文利用阻抗匹配平衡变压器本身的三相──二相系统的变换关系，三相侧ＡＢＣ系统与等效Ｏαβ系统的电压、电流变换关系，以及三相侧ＡＢＣ系统在０１２坐标制下的阻抗与０αβ系统中阻抗的变换关系，推导了在阻抗匹配平衡变压器牵引变电所中，牵引侧母线发生不同形式的短路故障时，短路电流的计算公式。实测结果证实了计算公式的正确性。本文为阻抗匹配平衡变压器牵引变电所中的电气设备的动、热稳定校验，故障分析，继电保护与自动装置的设计与整定提供了基础。

Applying three-phase to two-phase transformation relation of the impedance-matching balance transformer itself, the voltage and current transformation relation between ABC system and its equivalent 0 αβ system at the three-phase side, and the impedance transformation relation between ABC system under 012coordinate and 0 αβsystem, short-circuit current calculation formulae deduced when vqriety kinds of short-circuit failure appear in the traction power substation in which impedance-matching balance transformers are applied. The correctness of the formulae is verified by measured data. The conclusions of the paper are useful for failure analysis, the choosing of electrical equipment, the setting of relay protection and design of automatic control device in traction power supply system.