110 kV特殊内桥双线单主变接线及其备自投运行方式探讨

在110 kV完整内桥双线单主变变电所中，当无主变的母线或其进线到该母线任一点发生永久性故障时，存在投于故障母线的安全隐患，此时可采用桥开关备自投方式、且仅投入无主变母线对有主变母线的自投方式，因此主变只能由同一母线的进线供电。提出一种无主变母线不含母线压变、不含相应进线开关的110 kV特殊内桥双线单主变接线及其110 kV备自投工作原理，针对各类110 kV设备故障分析，表明该方案可消除上述安全隐患，并且可由任一进线供电，便于灵活安排运行方式。

Discussion on Special Wiring of Inner-Bridge Double-Connection Single Main Transformer and the Operation Mode of BZT

In 110 kV complete inner-bridge double-connection substation with single main transformer , when a permanent fault of bus without main transformer or of the incoming line occurs at any point of the bus , there exist security risks in the faulty bus, in which BZT （standby power supply automatic switching ） of bridge-switch should be adopted for the bridge-switch operation mode only reserving power source for the bus with the transformer of BZT. Therefore , the transformer is only supplied by the line with the transformer. The paper suggests a 110 kV special inner-bridge connection substation with single transformer, in which the bus without the transformer containing no potential transformer and the corresponding line switch and the work principle of the 110 kV BZT are proposed. The paper also analyzes various faults in 110 kV devices to show that the scheme can get rid of potential hazards above and the power can be supplied through any incoming line, which is convenient for flexible arrangement of operating modes.