JPS62182020U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a monitoring circuit for a circuit breaker trip circuit according to one embodiment of this invention, FIG. 2 is a circuit diagram of a monitoring circuit according to another embodiment of this invention, and FIG.
The figure is a circuit diagram of a conventional circuit breaker trip circuit monitoring circuit. In the figure, 1 is a trip contact, 2 is a monitoring auxiliary relay, 3 is a current limiting resistor, 4 is an auxiliary A contact of the circuit breaker, 5 is an auxiliary B contact of the circuit breaker, 6 is a trip coil, 7 is an A contact, 8 is a time-limited relay, 9 is a time-limited a contact, and 10 is a diode. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] (1) A monitoring circuit for a trip circuit of a power circuit breaker, which includes two trip coils connected between both poles of a DC power source to trip the circuit breaker, and these trip coils. circuit means for connecting between both poles of a DC power source so that they operate together; a monitoring auxiliary relay provided for each of the trip coils; and the trip coil and monitoring auxiliary relay. Each of the trip coils and a circuit means for operating these trip coils are connected in series between the two poles of the DC power source when the circuit breaker is closed. In the circuit means, the trip coil and the monitoring auxiliary relay connected in series between the two poles of the DC power source, the magnitude of the current flowing through these series circuits is such that normally only each of the monitoring auxiliary relays is operated. and circuit means connected between both poles of the DC power supply and generating an alarm when at least one of the monitoring auxiliary relays becomes inoperable. Monitoring circuit for device trip circuit. (2) The connection circuit means consists of a series-parallel circuit of auxiliary contacts consisting of two auxiliary A contacts of the circuit breaker connected in series and an auxiliary B contact of the circuit breaker connected in parallel to these, and The means for controlling the magnitude is comprised of a current limiting resistor having a resistance value appropriate to allow a desired current to flow, and the circuit means for operating the trip coil is comprised of a trip contact that closes when the circuit breaker is tripped;
One of the trip contacts is connected to the anode side of the DC power supply, the other is connected to the anode of each of the diodes, and the cathode of each diode is connected between the series-connected auxiliary a contacts of the series-parallel circuits. connected to the respective connection points, and the alarm generating means is a series circuit consisting of a common b contact of two monitoring auxiliary relays connected between both poles of the DC power supply and a time-limit relay, and a time-limit relay of the time-limit relay. A practical use characterized in that two series circuits are constructed between both poles of the DC power source, and the monitoring auxiliary relay, the current control means, the connection circuit means, and the trip coil are successively connected in series. A monitoring circuit for a circuit breaker trip circuit as claimed in claim 1. (3) The connection circuit means consists of a series-parallel circuit of auxiliary contacts consisting of two auxiliary A contacts of the circuit breaker connected in series and an auxiliary B contact of the circuit breaker connected in parallel to these, and The means for controlling the magnitude is comprised of a current limiting resistor having a resistance value appropriate to allow a desired current to flow, and the circuit means for operating the trip coil is comprised of a trip contact that closes when the circuit breaker is tripped;
One of the trip contacts is connected to the anode side of the DC power supply, the other is connected to the anode of each of the diodes, and the cathode of each diode is connected between the series-connected auxiliary a contacts of the series-parallel circuits. connected to the respective connection points, and the alarm generating means is a series circuit consisting of a common b contact of two monitoring auxiliary relays connected between both poles of the DC power supply and a time-limit relay, and a time-limit relay of the time-limit relay. A series-parallel circuit consisting of an a contact, in which the connection circuit means, the monitoring auxiliary relay, and the trip coil are connected in series, and the current control means is connected in parallel with the trip relay, two series-parallel circuits are connected between the DC power supply. A circuit breaker trip circuit monitoring circuit according to claim 1, characterized in that the circuit breaker trip circuit monitoring circuit is constructed as follows.