Overvoltage and protection of high voltage capacitor devoltage device

With the development of smart grid, high-voltage metering devices with anti-theft and real-time communication functions have gradually replaced the traditional metering devices, but the power supply of high-voltage metering devices has always been a technical difficulty. Nowadays, the principle of transformer is adopted in most of the power-taking modules, but this method is complex in structure and large in volume, which is not conducive to the device. High-voltage side suspension and operation, and vulnerable to external environmental interference can not be stable and reliable power supply. In order to solve the above problems, a new type of high voltage power supply circuit is developed based on the principle of capacitive voltage divider. Firstly, the high voltage capacitor is used to divide the voltage, and then the single-phase power supply module is designed. Then, based on the analysis of various faults of the power line, the three-phase high voltage on-line power acquisition device is designed. Finally, it is verified by the test. The results show that the device meets the design requirements, cancels the traditional transformer, and provides electric energy for the high-voltage metering device lightly and efficiently.