一个大站电气集中工程,有上千台继电器,几万个线头,如果接错了一个线头,继电器误动,就有可能造成行车事故,影响行车安全。为了校核组合配线是否正确,过去,是由两三个人用电表或电铃,一条线一条线地校核,只要表针一动或电铃一响,就认为配线是正确的。这样,在施工中一条线一条线地核对,需要花费大量时间, A large station electrical concentration project, there are thousands of relays, tens of thousands of thread, if the wrong one thread, the relay malfunction, it may cause traffic accidents, affecting traffic safety. In order to check the correct combination of wiring, in the past, by two or three personal meter or bells, one by one check, as long as a needle or bells ring, it is considered that the wiring is correct. In this way, in the construction of a line to check, it takes a lot of time,