Flammable gas found in the relay indicates some internal fault such as overheating or arcing, whereas air found in the relay may only indicate low oil level or a leak.
3
②检漏继电器采用零序电抗器并不影响选择性漏电保护的实现,而对其可靠工作作用明显;
A feeding switch with a leakage protection function to replace a leakage check relay should not be adopted for practices.