Abstract:

In order to ensure the stable operation of EAST fast control power supply, a new AC insulation monitoring technique, suitable for the high-frequency and high-voltage working environment of EAST fast control power supply, was presented. The unbalanced bridge of resistance was applied to cause changes in the partial voltage of the resistances by alternately switching, then voltages were collected real-time, and the value of insulation resistance could be calculated. The simulation platform based on Simulink was built to carry out real-time insulation monitoring analysis with ~220V and output of EAST fast control power supply as voltage input, and the waveforms were consistent with the expected. Through experimental verification, the new method can accurately complete the insulation monitoring of 220V AC input, and can work well in the fast control power supply field, where the accuracy of insulation monitoring is achieved.

Key words: EAST fast control power supply, High-frequency and high-voltage, Insulation monitoring, Unbalanced bridge

摘要：

为了保障EAST快控电源系统的稳定运行，提出了一种适用于EAST快控电源的高频高压工作环境的交流绝缘监测技术。此方法利用电阻不平衡桥，通过交替投切电阻造成分压的变化，实时采集电压，计算出绝缘电阻值。搭建了Simulink仿真平台，分别将~220V市电和EAST快控电源输出作为电压输入进行实时绝缘监测仿真分析，波形与预期相符。经过实验验证，新方法能够准确完成220V市电交流输入的绝缘监测，并且在快控电源现场能正常工作，达到绝缘监测的精度要求。

关键词: EAST快控电源, 高频高压, 绝缘监测, 不平衡桥