电气化铁路电能计量差错原因分析

Reason Analysis of Electric Energy Metering Error of Electrified Railway

电气化铁路牵引负荷是一种典型的冲击性负荷,基于电气化铁路负荷特点,对电气化铁路电能计量方式进行了分析。针对某电气化铁路牵引变电站电能计量差错问题,结合了向量图和负荷曲线进行分析,查明引起电量计量差错的原因是牵引变电站电能表A相电流极性接反。在停电恢复正确接线后,对该牵引变电站电能表进行现场检验。检验结果显示:电压及电流相序对应,电流极性正确,所得数据满足要求,与理论分析相符,由此验证了分析的正确性。

The traction load of electrified railway is a typical impact load. Based on characteristics of load of electrified railway, the electric energy metering mode of electrified railway is analyzed. Error problem of electric energy metering in a traction substation of electrified railway are analyzed combining with vector graphic and load curve. Reason of the electric energy metering error is found out which is the reversed polarity connection of A phase current of the electric energy meter in the traction substation. After its return to normal connection under power off condition, field detection of the electric energy meter in the traction substation was carried out. Detection results show that phase sequences between voltage and current has been matched and current polarity was correct and all data satisfied requirements which was consistent with theory analysis and thus testified the correctness of analysis.