故障相检示电驿

[电] fault phase selector relay

gù zhàng xiāng jiǎn shì diàn yì ㄍㄨˋ ㄓㄤˋ ㄒㄧㄤ ㄐㄧㄢˇ ㄕˋ ㄉㄧㄢˋ ㄧˋ