判断差动保护电流回路正确接线的方法

Method to Determine the Correction of Wiring for Differential Protection Current Loop

差动保护是大型变压器的主保护。由于两侧电流互感器的特性不可能完全一致,互感器的二次接线正确与否将直接影响到设备的安全运行。差动保护电流回路接线是否正确,可通过相量分析法和带负荷检验法进行判断。简要介绍了这两种方法,并举出计算实例。

Differential protection is the primary protection of large transformers. Because the characteris tics of current transformers on both sides can not be exactly the same transformer secondary wiring is correct or not will directly affect the safe operation of equipment. Differential protection circuit wiring is correct, can be compared with the amount of analysis and load test method to judge. These two methods are briefly introduced as well as the calculation example.