【摘要】 就三相三继电器完全星形接线与两相两继电器的不完全星形接线在Y ,d11接线变压器后发生两相短路时的灵敏度进行了分析与探讨 .若采用完全星形接线 ,在任何两相发生相间短路时 ,保护装置的灵敏度均较高 ;而采用不完全星形接线 ,在某两相发生相间短路时 ,保护装置的灵敏度将减小一半 ,但可采取在其公共线上接入第三个电流断电器的方法提高其灵敏度 .更多还原

【Abstract】 The sensitivity is analysed and discussed during two phase short circuit, after Y,d11 transformer,of relays on three phase complete star connection and two phase incomplete star connection.For complete star connection, the sensitivity of protection device is high when any two phase short circuit happens, while for incomplete star connection, the sensityvity is deducted by half. However, a third circuit relay can be used on common lines in order to improve the sensitivity.更多还原