A kind of tripping and closing monitoring circuit and fault alarm method
A technology of tripping circuit and closing circuit, which is applied in the field of relay protection, can solve the problems of potential safety hazards and the inability to monitor the whole process, and achieve the effect of improving reliability
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Embodiment 1
[0043] In view of this, the embodiment of the present invention proposes a tripping and closing monitoring circuit to monitor the whole process of the tripping circuit and closing circuit during normal operation of the electric equipment, especially to monitor the connection of the pressure plate of the tripping outlet. figure 2 It is a schematic diagram of electrical connection of a tripping and closing monitoring circuit provided by Embodiment 1 of the present invention. refer to figure 2 , The tripping and closing monitoring circuit provided by the embodiment of the present invention includes: a tripping circuit 100, a closing circuit 200 and an alarm circuit 300;
[0044] The trip circuit 100 includes the normally open auxiliary contact BG1 of the circuit breaker, the trip coil TQ, the normally open contact TBJ1 of the trip self-hold relay, the trip self-hold relay coil TBJ, the closing monitoring relay HWJ, the trip contact TJ of the interval protection, the pressure pl...
Embodiment 2
[0058] On the basis of the foregoing embodiments, continue to refer to figure 1 , the first end of the coil TLJ of the closing circuit monitoring relay is electrically connected to the first end e of the closing reset contact ZHJ, the second end of the coil TLJ of the closing circuit monitoring relay is connected to the second end of the closing reset contact ZHJ Terminal f is electrically connected.
[0059] Specifically, the advantage of this setting is that it can ensure that when any point in the trip circuit 200 is disconnected except the closing reset contact ZHJ, the closing circuit monitoring relay HLJ will reset, and the alarm circuit 300 will report "closing circuit disconnected". line" warning signal. The closer the connection points at both ends of the closing circuit monitoring relay HLJ are to the connection points at both ends of the reset contact ZHJ, the more favorable it is to monitor the entire process of the closing circuit 200 .
[0060] Optionally, the ...
Embodiment 3
[0063] image 3 It is a schematic diagram of electrical connection of a tripping and closing monitoring circuit provided by Embodiment 3 of the present invention. refer to image 3 , On the basis of the above-mentioned embodiment, the first end of the coil TLJ of the tripping circuit monitoring relay is electrically connected to the positive terminal 101 of the first power supply, and the second end of the coil TLJ of the closing circuit monitoring relay is connected to the first end c of the pressure plate LP Electrically connected, the second end d of the pressure plate LP is electrically connected to the normally open contact TBJ1 of the tripping self-holding relay.
[0064] Specifically, under normal circumstances, the trip contact TJ of this interval protection is located in the internal plug-in of the protection device, which is not convenient for the connection of the coil TLJ of the trip circuit monitoring relay. Therefore, the first end of the coil TLJ of the trip ci...
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