Partial discharges are the major cause of deterioration in the insulation characteristics of switchgears. Therefore, timely detection of partial discharge in switchgear and potential insulation faults is an urgent problem that needs to be addressed in the power supervision industry. In this study, a device was proposed for online monitoring of high-voltage switchgears based on pulse current method and ozone (O₃) detection. The pulse current method obtains the PD signal by monitoring the phase holes on the switch indicator. Occurrence of a partial discharge in a certain phase leads to the production of a discharge pulse, which can be coupled out by a capacitive sensor. The current spectrum and the O₃ produced by partial discharge were processed via fast Fourier transform for accurate diagnosis of the occurrence of partial discharge and its severity in switchgears. The proposed method allows for convenient acquisition of the partial discharge signal, simple installation of the device, and realization with inexpensive sensors.

局部放电是导致开关设备绝缘性能下降的主要原因。因此，及时检测开关设备中的局部放电和潜在的绝缘故障是电力监管行业亟待解决的问题。在这项研究中，提出了一种基于脉冲电流法和臭氧（O ₃）检测在线监测高压开关柜的设备。脉冲电流法通过监视开关指示器上的相孔来获得PD信号。在特定阶段中发生局部放电会导致产生放电脉冲，该放电脉冲可以通过电容传感器耦合出来。当前光谱和O ₃通过快速傅里叶变换对由局部放电产生的气体进行处理，以准确诊断开关柜中局部放电的发生及其严重性。所提出的方法允许方便地获取局部放电信号，设备的简单安装以及利用便宜的传感器来实现。