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泵站直流电源输出线路复杂、庞大,直流母线接地可以是常见故障。在直流母线单点接地时,继电保护一般要求不能因此误动。在此案例中,由于综保开关量输入BI门槛电压(起动)值选择较低,直流输出电压调整值较高,控制电缆导线对地分布电容的存在,当直流母线发生正对地故障时,即瞬时触发了事故发生,此干扰信号将联接在直流母线上的所有断路器综保分闸(或合闸)命令使能,导致大批正在正常运行的水泵停机事故。
Pump station DC power output line complexity, huge, DC bus grounding can be a common fault. Single-point grounding in the DC bus, the general requirements of relay protection can not be so malfunctioning. In this case, due to the lower value of BI threshold value (BI), the higher DC output voltage adjustment value, the control cable conductor to the ground distributed capacitance exists, when the DC bus fault occurs directly to the ground, Ie an instantaneous triggering of an accidental signal that enables all breaker tripping (or closing) commands connected to the DC bus to cause a large number of downtime of a functioning pump.