牵引变电所27.5 kV母线电压特性及监察方法研究

Research on the Characteristics and Monitoring Methods of 27.5 kV Bus Voltage in Traction Substation

研究目的:电气化铁路牵引变电所27.5 kV母线电压是衡量供电能力和进行保护整定的重要参数。实际运行中27.5 kV母线电压互感器发生渐进型故障的现象屡有发生,现有母线电压监察措施不能及时发现最终导致保护动作出口跳闸、整段母线失电,扩大了事故影响范围,因此有必要对牵引变电所27.5 kV母线电压特性及其监察方法进行研究。研究结论:(1)牵引变电所27.5 kV母线电压主要受牵引变压器容量和系统短路容量的影响,其中系统短路容量的影响较大;(2)高铁牵引变电所27.5 kV母线电压具有空载电压较高、波动范围有限的特性,波动范围从最大负荷到空载基本在24~29 kV之间;(3)提出了适用于电气化铁道的27.5 kV母线电压值偏低告警功能和母线电压互感器电压差偏高告警功能的监察方法;(4)本文研究可为尽早识别母线电压异常、保证牵引变电所正常运行提供参考。

Research purposes:The 27.5 kV bus voltage of electrified railway traction substation is an important parameter of the power supply capacity and protection setting.Progressive failure of 27.5 kV bus voltage transformer often occurs in actual operation.But the existing bus voltage monitoring measures can not detect the progressive fault in time,which eventually leads to the protection action outlet tripping and the power loss of the whole bus,expanding the scope of the accident.It is necessary to study the characteristics and monitoring methods of 27.5 kV bus voltage in traction substation.Research conclusions:(1)The 27.5 kV bus voltage of traction substation is mainly affected by the capacity of traction transformer and system short-circuit capacity,of which the system short-circuit capacity has a greater impact.(2)The 27.5 kV bus voltage of high-speed railway traction substation has the characteristics of high no-load voltage and limited fluctuation range.The fluctuation range is basically between 24~29 kV from maximum load to no-load.(3)The monitoring method of 27.5 kV bus voltage value low alarm function and bus voltage transformer voltage difference high alarm function is proposed for electrified railway.(4)The research results in this paper can provide reference for identifying the bus voltage anomaly as soon as possible and ensuring the normal operation of traction substation.