变压器综合差动保护系统试验方法探讨

A Discussion on Test Methods for Transformer's Integrated Differential Protective System

采用综合差动保护装置后,变压器联接组别相角差一般通过装置内部程序算法自动校正,变压器各侧电流互感器只要接成星形即可,由此产生了传统变压器差动保护系统试验的新问题。文章从研究试验电源相序对流入综合差动保护装置各侧电流的相角差,以及对装置内部计算差动电流的影响出发,结合综合差动保护装置具备电流测量和自动极性校正的特点,提出了新的系统试验方法。

Since the integrated differential protective system was adopted, the phase angle difference of the transformer＇ s connecting group grade has been automatically corrected by the built-in programming algorithm. The current mutual-inductor of the transformer＇ s each side is to be connected as a star. Thus some new problems appeared in tests on the traditional transformer＇ s differential protective system. Based on effect of the phase sequence of the test power source on phase angle difference caused by the current flown into the integrated differential protective device and on differential current calculation by the inner device, some suggestions are put forward in combination with characteristics of the current measurement and automatic polarity correction of the integrated differential protective device.