基于35 kV高压开关柜的综合局部放电检测技术

Partial Discharge Test Technology Based on 35 kV High Voltage Switchgear

高压开关柜作为电力系统重要的电气组成设备,其运行的可靠性直接影响电网的运行水平。开关柜在制造和运行过程中,在不停电的情况下通过检测开关柜内设备的局部放电现象,可有效避免因绝缘缺陷引起的电气故障。分析了特高频(UHF)、超声波(AE)、暂态地电压(TEV) 3种局部放电检测原理,利用局部放电检测仪对高压开关柜进行了现场测试,分析了检测波形及图谱,将局部放电检测项目应用在电网日常维护中,有效地降低电气设备故障率,提高电网运行安全可靠性。

As an important electrical equipment in power system,the safety and reliability of high voltage switchgear directly affect the operation level of power grid.In the process of manufacture and operation of switchgear,in order to effectively avoid the occurrence of electrical faults,this paper analyzed three kinds of partial discharge detection principles:ultra-high frequency,ultrasonic and transient earth voltage.The high voltage switchgear was tested by partial discharge detector.The detection waveform and atlas were analyzed in detail,and the partial discharge detection items were applied to the daily maintenance of power grid.It can effectively reduce the faults rate of electrical equipment and improve the safety and reliability of power grid operation.