Limited circumstances permanent fault, automatic re-closing devices on the move after the opening relay action Zaitao to identify reasons, be excluded from the power supply.
少数情况属永久性故障，自动重合闸装置动作后靠继电保护动作再跳开，查明原因，予以排除在送电。
2
Relay contacts should be shielded from the coil to minimize induced noise from the relay power supply.
继电器触点和线圈之间应该屏蔽，以使继电器电源引起的感应噪声最小。
3
This paper briefly introduced the important of mine electricity supply security and the problems and solutions of relay.