摘要
局部放电会加速高压设备绝缘老化,导致设备故障。局放测量是开关设备状态评价的重要依据,通常结合暂态地电压和超声波检测法对开关柜局放检测,存在易受外界信号干扰和难以定位故障等缺点。为此,从暂态地电压形成的机理出发,对暂态地电压的特点进行分析,提出对可疑高压开关柜实施长时间监测,利用天线屏蔽外界干扰信号,从复杂的信号源中辨识开关柜局部放电信号,通过矩阵探头定位法实现局部放电故障定位。实际工作中成功发现并定位故障点,验证了方法的可行性和准确性。
Partial discharge accelerates insulation aging and leads to insulation failure of high voltage equipment.PD test is an important basis for condition evaluation of switchgear. It is usually combined with transient earth voltage and ultrasonic detection methods to detect partial discharge of switchgear,which is vulnerable to external signal interference and difficult to locate the fault. Therefore,based on the formation mechanism of transient earth voltage,this paper analyzes the characteristics of transient earth voltage and proposes a long-term monitoring method for suspicious HV switchgear. The antenna is used to shield the external interference signal,and the switchgear partial discharge signal is identified from complex signal sources,Finally the fault location of partial discharge can be located by the method of matrix probe. The fault location is found and located in the actual working case,which can verify the method is accurate and feasible.
作者
张隆
黄伟华
杨志平
邬益燊
ZHANG Long;HUANG Weihua;YANG Zhiping;WU Yishen(Heyuan Power Supply Bureau,Guangdong Power Grid Corporation,Heyuan 517000,China)
出处
《黑龙江电力》
CAS
2019年第1期68-72,78,共6页
Heilongjiang Electric Power
关键词
暂态地电压
开关柜
绝缘
局部放电
故障定位
transient earth voltage
switchgear
insulation
partial discharge
fault location
