Anti-interference device and method for partial discharge detection of converter transformer

According to the anti-interference device and method for partial discharge detection of the converter transformer, the knob switches are arranged between the sub-filter circuits of different frequency bands, frequency band switching is achieved, the high-pass filter circuit and the low-pass filter circuit are combined for use, and the anti-interference effect is achieved. The high-pass filtering sub-circuit and the low-pass filtering sub-circuit are arranged to be of a five-order passive filtering circuit structure, external interference in partial discharge detection can be eliminated, it is ensured that partial discharge signals in the converter transformer are not interfered by external signals, and it is ensured that partial discharge detection data are accurate; the method is suitable for partial discharge detection of the converter transformer of a converter station in operation. 本发明提出了一种用于换流变压器局部放电检测的抗干扰装置及方法，通过在不同频段子滤波电路间设置旋钮开关，实现了频带的切换，结合高通滤波电路和低通滤波电路的使用，将高通滤波子电路和所述低通滤波子电路均设置为五阶无源滤波电路结构，能够消除局部放电检测中的外