为实现对固体开关柜内部局部放电的在线监测,获取开关柜内部真实的局部放电量以及评估的绝缘状况,研制了一种固体开关柜局部放电在线检测装置.该装置利用超声波传感器和谐振电路采集发生局部放电时产生的高频信号,将高频信号转换成电压信号;再将电压信号经过数据预处理环节和模数转换后发送到STM32主控芯片;通过函数关系式对采集到的电信号数据进行换算,得到局部放电量的大小并实时显示在LCD屏幕上.若检测到的放电量大于某设定值就自动发出报警,提醒现场电力人员对其进行关注,防止因绝缘损坏导致发生重大电力事故.该装置具有操作简单、信号处理速度快、检测数据实时性高、费用低等特点,适合对中高压设备内部局部放电进行实时监测,方便运行人员对设备进行维保,确保设备的正常运行,对于提高供电可靠性具有重要意义.%In order to realize the on-line monitoring of the partial discharge (PD) inside the solid switchgear,and obtain the real local discharge quantity in the switchgear and to evaluate the insulation condition,an online partial discharge detection device for the solid switchgear is developed.By adopting the ultrasonic sensor and the resonant circuit,the device collects the high frequency signals generates when partial discharge occurs,then the high frequency signal is converted to the voltage signal,and the voltage signal is sent to the STM32 master control chip through the data pre-processing and analog-to-digital conversion.The electrical signal data collected are converted to the partial discharge quantity through the function of the relationship,and finally the amount of the PD value is displayed in real-time on the LCD screen.If the detected PD value is greater than a set value,an alarm will be automatically sent to alert operator to pay attention for preventing power accidents caused by insulation damage.The device features many advantages of simple operation,fast speed signal processing,good real-time performance and low cost.It is suitable for real-time monitoring of the local discharge in the middle and high voltage equipment,so as to facilitate the operation and maintenance of the equipment to ensure the normal operation of equipment.It has a great significance for improving the reliability of power supply.
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