JPH0583976U - Power breaker control circuit - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the timing difference between the confirmation of the power-on spring accumulation and the completion of energy accumulation. [Structure] An electric spring operating mechanism controls closing and tripping of a power circuit breaker, and the confirmation of the accumulation of the closing spring and the completion of accumulation of electricity are obtained by a limit switch and its operation cam. One of the contacts LSb is used for energy storage confirmation and the other contact LSa is used for energy storage completion so that the operation timings of both contacts do not shift.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a control circuit for a power circuit breaker, and more particularly to an operating mechanism for a limit switch for confirming the energy accumulation of a closing spring and a limit switch for energy accumulation completion.

[0002]

[Prior Art]

 The electric spring operating mechanism of the power circuit breaker has the following operating procedure.

(1) Energy is stored by accumulating the closing spring by the rotational force of the electric motor.

(2) A closing operation is performed by releasing the stored closing spring energy, and at the same time, the breaking spring is stored.

(3) The tripping is performed by the stored breaking spring.

In the course of each operation described above, the operating mechanism takes the following four different stationary states.

(A) Circuit breaker “ON”, closing spring “stored” (B) Circuit breaker “OFF”, closing spring “stored” (C) Circuit breaker “ON”, closing spring “release” (D ) Circuit breaker "off", closing spring "release" In these states, (A), (B), (C) are repeated in this order, but as a special case of circuit breaker (D) It will be in the free tripping state (when the tripping is performed immediately after inputting).

FIG. 2 shows a conventional control circuit, and its time chart is shown in FIG. In FIG. 2, the operating condition of the circuit closing control coil 52C of the circuit breaker includes the closing switch LS1 for confirming the closing of the spring energy, the normally closed contact 52b of the auxiliary switch 52, and the normally closed contact of the pumping prevention relay 94. 94b and a pressure switch locking density switch 63G are provided. The pumping prevention relay 94 is held by itself by turning on the normally open contact 52a of the auxiliary switch 52.

The closing control coil 52T is conditioned on the operation of the auxiliary switch 52, and the electric motor electromagnetic switch 88M is conditioned on the operation of the closing spring energy storage completion limit switch LS2.

In the control operation, at the closed circuit spring release start position Pa shown in FIG. 3, the operating rod of the circuit breaker is in the open position and its contact is in the off state. Then, the energization of the closing control coil 52C starts the energization of the energizing spring, and the contactor of the circuit breaker is turned on and assists immediately before reaching the closing spring release completion position (energy start position) Pb. The contact 52b of the switch is turned off, then 52a is turned on, and the energization of the closing control coil 52C is cut off.

At this time, at the position Pb, the closing spring energy storage confirmation limit switch LS1 is turned off to inhibit the operation of the control coil 52C, and the energy storage completion limit switch LS2 is turned on to cause the electromagnetic opening / closing of the electric motor. Operation of the vessel is started.

After that, when the limit switch LS2 is turned off at the closing spring energy storage completion position Pc, the limit switch LS1 is also turned on, and the circuit breaker preparation for opening is completed.

[0013]

[Problems to be solved by the device]

 In the conventional control circuit, the limit switches LS1 and LS2 are arranged in parallel and operated by one cam so that they operate at the same timing.

Here, from the viewpoint of withstand voltage performance, since the limit switches LS1 and LS2 are arranged in parallel with an insulating plate interposed therebetween, the mounting angles of the limit switches LS1 and LS2 are displaced by the cam operation. May come.

That is, at the time of assembly, the mounting angle is adjusted so that the limit switches LS1 and LS2 are simultaneously operated by one cam, but the mounting angle is displaced by the impact of the cam operation while the opening / closing operation by the cam is repeated. The operation of one limit switch and the operation timing of the other limit switch are deviated.

With respect to this timing deviation, for example, if the closing spring energy storage confirmation limit switch LS1 causes an operation delay, the closing command cannot be issued. Further, when the closing spring energy storage completion limit switch LS2 is delayed in operation, the closing spring energy storage electric motor cannot stop.

It is an object of the present invention to provide a control circuit that prevents the timing difference between the closing spring energy storage confirmation and the energy storage completion.

[0018]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention controls the closing and tripping of a circuit breaker for electric power by an electric spring operating mechanism, and a control to obtain confirmation and completion of accumulation of the closing spring by a limit switch and its operation cam. In the circuit, the limit switch is a bipolar type limit switch, and the energy storage confirmation control is performed by one contact operation of the limit switch, and the energy storage completion control is performed by the other contact operation.

[0019]

[Action]

 One operating rod of a bipolar limit switch is operated by a cam, one contact of the switch is used for confirming energy storage, the other contact is used for energy storage completion, and both contacts are displaced by the impact of the cam. There is no simultaneous timing on / off operation.

[0020]

【Example】

 FIG. 1 is a control circuit diagram showing an embodiment of the present invention. 2 is different from FIG. 2 in that it is replaced with the conventional two single-pole type limit switches LS1 and LS2 to be a single bipolar type limit switch LS, and its normally open contact LSa and normally closed contact LSb are respectively limited switches. It is a point used as LS2 and LS1.

The limit switch LS is operated with a timing adjusted by one cam, and its contacts LSa and LSb operate in the opposite direction at the same timing.

At this time, the contacts LSa and LSb are insulated in the limit switch LS, and the limit switch has only one operating point. As a result, after the assembling adjustment of the operating mechanism, the operating points of the contacts LSa and LSb will not be displaced due to the impact of the opening / closing operation, and no malfunction will occur in the operation.

[0023]

[Effect of the device]

 As described above, according to the present invention, one bipolar limit switch and its operation cam are used to obtain the operation signals for confirming and completing the energy accumulation of the closing spring, so that the operation timing for energy accumulation confirmation and completion can be obtained. It will not be displaced due to the impact of the cam, the malfunction of the circuit breaker will be surely prevented, and the trouble of readjustment will be unnecessary.

[Brief description of drawings]

FIG. 1 is a control circuit diagram showing an embodiment of the present invention.

FIG. 2 is a conventional control circuit diagram.

FIG. 3 is an operation time chart.

[Explanation of symbols]

LSb ... Make-up spring energy storage completion / confirmation limit switch contact for power accumulation confirmation LSa ... Make-up spring energy storage completion / confirmation limit switch energy storage completion contact

Claims (1)

[Scope of utility model registration request] 1. A control circuit for controlling closing and tripping of a circuit breaker for electric power by an electric spring operation mechanism, and confirming the accumulation of a closing spring and completion of accumulation of electricity by a limit switch and its operation cam. A control circuit for a power circuit breaker, which is a bipolar type limit switch, wherein energy saving confirmation control is performed by one contact operation of the limit switch and energy accumulation completion control is performed by the other contact operation.