主动扰动技术在停电配电线路相间故障检测中的应用

摘要

提出了一种停电中压配电线路相间故障检测技术.在配电变压器低压侧经电力电子开关接入一逆变电源,馈线停电后,通过控制电力电子开关将逆变电源经配电变压器短时接入,在给停电线路故障相间施加瞬时高压以击穿可能存在的故障点的同时,通过对断路器下游侧暂态电压的检测与分析判定是否存在相间故障.该技术无需通信,既可用于配电线路自适应重合闸,也可用于停电一段时间后的尝试性送电,理论、仿真分析和模拟实验均验证了所提技术的有效性.%A method for detecting the interphase fault of de-energized MV(Middle Voltage) distribution lines is proposed.An inverter is connected to the LV(Low Voltage) side of distribution transformer via an elec tronic power switch.When a feeder is de-energized,the inverted power supply is exerted on the distribution transformer temporarily by controlling the electronic power switch to inject a transient high-voltage into the de-energized lines for disrupting the possible interphase fault.At the same time,the transient voltage at the downstream-side of breaker is measured and analyzed to detect the possible interphase fault.Without communication,the proposed method can be applied to the adaptive reclose of distribution lines as well as the tentative power supply after a temporary power-loss,which is verified by theoretical analysis,simulative analysis and simulation experiment.