电气设备局部放电的超声波信号分析研究

Study on Ultrasonic Signal of Partial Discharge of Electrical Equipment

在电力系统中,包含高压开关柜在内的众多电力设备都面临着绝缘故障的威胁,采用局部放电监测可以很好掌握设备的绝缘状态,从而有序进行相应检修。超声波技术是局部放电的一种精确度较高的监测技术,具有较大的应用领域,但基于超声波的局部放电监测存在着难以获取局部放电强度的问题,无法对局部放电信号全面分析,开展了局部放电的超声波监测试验,分析研究开关柜局部放电间隙上施加的电压、超声波传感器与局部放电源之间的距离等因素对超声波信号振幅和频率的影响。

In the power system,many power equipment,including high-voltage switch cabinet,are faced with the threat of insulation failure.The insulation state of equipment can be well mastered by partial discharge monitoring,so that the corresponding maintenance can be carried out in an orderly manner.Ultrasonic technology is a high precision monitoring technology for partial discharge,which has a large application field.However,the partial discharge monitoring based on ultrasonic wave has the problem of difficulty in obtaining partial discharge intensity,and inability to completely analyze the partial discharge signal.This paper carries out the ultrasonic monitoring experiment of partial discharge,analyzing and studying the influence of the voltage applied to the partial discharge gap of the switch cabinet,the distance between the ultrasonic sensor and the local discharge source,etc.on the amplitude and frequency of the ultrasonic signal.