CAJ | 학술논문

随着开关柜电压等级的提高，高压部分与低压智能化设备的电磁兼容问题日益突出，断路器开断被认为是中压开关柜中最严重的电磁干扰来源，它可能会造成二次控制设备出现故障，研究开关柜开断对二次智能设备的电磁干扰问题具有重要意义。利用振荡型合成试验回路对10 kV开关柜进行合成开断试验，同时采集了电流互感器输出电流信号，智能操控装置和间隔智能单元输入电流信号。对采集的波形数据进行时频特性分析，得到干扰信号的频带及能量分布情况。结果表明：开关柜开断对电流互感器二次侧、智能操控装置以及间隔智能单元均产生了瞬态电磁干扰，开断燃弧过程的干扰频带主要分布在31.25~62.5 MHz；电弧过零阶段频带主要分布在15.625~31.25 MHz；干扰幅值最大达到正常情况下的4倍。
수착개관거전압등급적제고，고압부분여저압지능화설비적전자겸용문제일익돌출，단로기개단피인위시중압개관거중최엄중적전자간우래원，타가능회조성이차공제설비출현고장，연구개관거개단대이차지능설비적전자간우문제구유중요의의。이용진탕형합성시험회로대10 kV개관거진행합성개단시험，동시채집료전류호감기수출전류신호，지능조공장치화간격지능단원수입전류신호。대채집적파형수거진행시빈특성분석，득도간우신호적빈대급능량분포정황。결과표명：개관거개단대전류호감기이차측、지능조공장치이급간격지능단원균산생료순태전자간우，개단연호과정적간우빈대주요분포재31.25~62.5 MHz；전호과령계단빈대주요분포재15.625~31.25 MHz；간우폭치최대체도정상정황하적4배。
Along with uprating the voltage class of the switchgear the electromagnetic compatibility (EMC) between the high-voltage components and the low-voltage smart devices becomes increasingly prominent, and the breaking of the circuit breaker inside the medium-voltage switch cabinet is regarded as the source of the most severe electromagnetic interference, because it could lead to the failures in the secondary control devices, therefore it is significant to research the electromagnetic interference on secondary smart devices caused by breaking the switchgear. The oscillation mode of synthetic test circuit is used to perform breaking test of 10kV switch cabinet and the acquisition of the output current signal of CT and the input current signals of smart control devices and bay smart units are carried out simultaneously. The time-frequency analysis on the acquired signals is performed to obtain the frequency band and the energy distribution situation of the interference signals. Test results show that the breaking of the switchgear leads to the transient electromagnetic interferences on CT’s secondary side, smart control devices and bay smart units; the interference frequency band during the breaking and arcing process is mainly within the range from 15.625 MHz to 62.5 MHz; the maximum amplitude of the interference is four times as large as its normal value.