CAJ | 학술논문

局部放电测量是监测绝缘系统所存缺陷的一种较为常见的非破坏性实验方法。本文以电力变压器为例，说明在局放信号采集过程中，如何利用差动平衡法抑制在变压器的高压端所引入的脉冲干扰信号，使得采集的信号更为可靠。文中描述了差动平衡法的原理，给出了实现移相、调幅、差动放大的电路，并且通过实验数据来比较说明差动平衡法的抗干扰效果。
국부방전측량시감측절연계통소존결함적일충교위상견적비파배성실험방법。본문이전력변압기위례，설명재국방신호채집과정중，여하이용차동평형법억제재변압기적고압단소인입적맥충간우신호，사득채집적신호경위가고。문중묘술료차동평형법적원리，급출료실현이상、조폭、차동방대적전로，병차통과실험수거래비교설명차동평형법적항간우효과。
The measurement of PD is a common non-destructive effect testing method to mornitor the defect existing in the insulation system. The power transformer is taken as an example in this paper to show how to restrain pulse interference led from high voltage side of transformer by using differential balanced method in the process of obtaining the PD signals, therefore making obtained signals more reliable. The principle of differential balanced method is discribed. The circuits of realizing shifting phase, amplitude modulation and differential amplification are presented. The antijamming effect of differential balanced method is compared and illustrated based on the testing data.