负序系统对微机型主变差动保护的影响

The effect of negative sequence system on microprocessor differential protection of main transformer

对于Y/Y/Δ-11接线的变压器微机型差动保护,其各侧电流的角度和变比均可通过软件自动进行补偿。而在负序的一次系统下,若将二次接线人为倒相且按照一般情况进行保护定值整定,则会对差动保护的正常运行产生影响。

For the microprocessor differential protection of Y/Y/Δ-11 wiring transformer, each side of current variable angle and ratio can automatically compensate by software. Under the negative sequence of primary systems, if secondary wiring were artificially phase reversal and set protective constant value according to common situation, which will have effect on normal operation of differential protection.