CN202872319U

CN202872319U - Burnout-proof automatic protection device of a high voltage circuit breaker closing coil

Info

Publication number: CN202872319U
Application number: CN 201220489244
Authority: CN
Inventors: 孙益敏
Original assignee: Jiangxi Copper Co Ltd
Current assignee: Jiangxi Copper Corp; Jiangxi Copper Co Ltd
Priority date: 2012-09-25
Filing date: 2012-09-25
Publication date: 2013-04-10
Anticipated expiration: 2022-09-25

Abstract

The utility model relates to a burnout-proof automatic protection device of a high voltage circuit breaker closing coil. The protection device comprises a circuit breaker, an intermediate relay, and a microcomputer signal controller, wherein a normally closed contact of the intermediate relay is connected with a closing power supply loop of the circuit breaker in series, an auxiliary normally open contact of the circuit breaker is connected with a switching amount input point of the microcomputer signal controller, the switching amount output point of the microcomputer signal controller is connected with an intermediate relay coil; a time delay relay is arranged in the microcomputer signal controller, and the time delay reaction time is set according to the time of different coils for resisting the large current. The coil is effectively prevented from being burnt out due to long-time power on of the closing coil of the circuit breaker.

Description

The anti-automatic safety device that burns of primary cut-out closing coil

Technical field

The utility model relates to a kind of primary cut-out, relates in particular to the large electric current closing coil of primary cut-out protective device.

Background technology

At present, for guaranteeing personal safety, the circuit breaker of Novel high tension switchgear must close door operation.Switchgear product before the new standard generally takes cabinet door perforate mode to transform, and the operations staff can close door operation.But this reforming mode has brought a kind of device security hidden danger.Originally the cabinet door is cancelled with the mechanical interlocking function of circuit breaker, and needs are artificial pushes to locking plate and could close a floodgate, if operating personnel's misoperation, do not push to chain, closing a floodgate just can not be successful, just has so large electric current in the closing coil and switches on for a long time, surpass certain hour, coil is with regard to heating burnout.

Summary of the invention

The purpose of this utility model provides a kind of primary cut-out closing coil prevents burning automatic safety device, prevents that the primary cut-out current coil from burning.

The purpose of this utility model reaches like this: comprise circuit breaker, auxiliary relay, microcomputer signal controller; The auxiliary relay normally closed contact is series at the power switch loop of circuit breaker, and the auxiliary normal opened contact of circuit breaker is connected to microcomputer signal controller switching value input point, and microcomputer signal controller switching value output point connects the auxiliary relay coil; In the microcomputer signal controller time-delay relay is set, the time-delay reaction time can be set according to the large current time that passes through of different coil tolerances.

Can realize the following beneficial effect of the utility model by such scheme: after operating personnel send switching signal by the microcomputer signal controller, microcomputer signal controller internal delay time relay begins timing, within the time of setting, circuit breaker does not close a floodgate, the switching value input point that is the microcomputer signal controller does not receive the switching signal that circuit breaker is assisted normal opened contact, microcomputer signal controller switching value output point sends signal to auxiliary relay, so that auxiliary relay gets the power switch of electric cut-off breaker, thereby prevent the long-time energising of breaker closing coil and cause coil burnout.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model;

Among the figure: 1. circuit breaker, 2. microcomputer signal controller, 3. auxiliary relay, 12. circuit breakers are assisted normal opened contact, 13. breaker closing coils; 21. microcomputer signal controller switching value input point, 22. microcomputer signal controller switching value output points, 31. auxiliary relay coils, 32. auxiliary relay normally closed contacts.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

Microcomputer signal controller 2 itself carries the closing operation signal and receives control and time-delay clocking capability, and the time-delay reaction time can set up on their own in 0-5s.

During use, the time-delay reaction time of supposing microcomputer signal controller 2 is set as 0.5s, the combined floodgate mechanical chain sheet of circuit breaker is not pushed to, can carry out closing operation by microcomputer signal controller 2 so, through after the 0.5s, circuit breaker 1 does not close a floodgate successfully, at this moment, the auxiliary normal opened contact 12 of circuit breaker does not move, microcomputer signal controller 2 detects microcomputer signal controller switching value input point 21 stateless to be changed, microcomputer controller switching value output point 22 closures output signal to auxiliary relay 3, auxiliary relay coil 31 electric after, auxiliary relay normally closed contact 32 disconnects, thereby guarantees that in time disconnection of power switch prevents from burning by large current heating in the breaker closing coil 13.Simultaneously, microcomputer signal controller 2 sends fault-signal.

When normal running, microcomputer signal controller 21 is in sending switching signal 0.5s, circuit breaker 1 closes a floodgate, circuit breaker is assisted normal opened contact 12 closures, microcomputer signal controller switching value input point 21 closures, microcomputer controller switching value output point 22 is not closed, and auxiliary relay coil 31 must not electricity.Auxiliary relay normally closed contact 32 remains closed.Microcomputer signal controller 2 sends switching signal of circuit breaker.

The time-delay reaction time of microcomputer signal controller 2 interior time-delay relays can be set according to the large current time that passes through of different coil tolerances, and scope is 0-5s.

This shows that the utility model has been realized the function of protective circuit breaker closing coil.

Claims

1. a primary cut-out closing coil prevents burning automatic safety device; comprise circuit breaker (1), auxiliary relay (3), microcomputer signal controller (2); it is characterized in that auxiliary relay normally closed contact (32) is series at the power switch loop of circuit breaker; circuit breaker assists normal opened contact (12) to be connected to microcomputer signal controller switching value input point (21), and microcomputer signal controller switching value output point (22) connects auxiliary relay coil (31).

2. described a kind of primary cut-out closing coil prevents burning automatic safety device according to claim 1; it is characterized in that in the microcomputer signal controller (2) time-delay relay being set, the time-delay reaction time can be set according to the large current time that passes through of different coil tolerances.