CN201294375Y

CN201294375Y - On-off coil protector for circuit breaker

Info

Publication number: CN201294375Y
Application number: CNU2008202187205U
Authority: CN
Inventors: 于哲; 李永刚; 马素媛; 赵玉秋
Original assignee: Angang Steel Co Ltd
Current assignee: Angang Steel Co Ltd
Priority date: 2008-10-28
Filing date: 2008-10-28
Publication date: 2009-08-19
Anticipated expiration: 2018-10-28

Abstract

The utility model relates to a circuit breaker brake opening and closing coil protective device, wherein a brake closing loop and a brake opening loop are respectively connected with delay disconnected normally closed contacts in series, and namely a middle relay KAM is connected with a direct current contactor TB, a normally closed (or normally opened) auxiliary contact and a brake closing (or brake opening) coil which are connected with a time relay KT in the brake closing loop and the brake opening loop in series. Thereby, a brake opening operation loop and a brake closing operation loop can be delayed for separating under the condition that a brake opening signal and a brake closing signal do not disappear, a brake opening coil and a brake closing coil can be prevented from burning due to excitation for long time, brake tripping pulses can be sent out for the second time or for multiple times, the switch can be tripped, and accident expansion can be effectively prevented. The connection is simple, the maintenance is convenient, the protective device is safe and reliable, the service life of coils is prolonged, and the protective device has higher economic value.

Description

The circuit-breaker switching on-off coil protector

Technical field

The utility model belongs to the electrical control field, is specifically related to a kind of protective relaying device that is used for the circuit-breaker switching on-off coil.

Background technology

At present; the protective device of conventional type or the protective relaying device of microcomputer type are still adopted in the relaying protection of domestic a lot of electrical power system in substation; because the circuit breaker of some electric substation is aging; cause mechanism's operation to run improperly; when carrying out the backstage remote operation, often will divide, closing coil burns out, and change divide, closing coil not only incur loss through delay give, interruption duration; waste financial resources and material resources, and have a strong impact on normal power supply.

In addition, circuit breaker being carried out the backstage remote operation when unsuccessful, just need carry out secondary operation, but nobody or few personal management because present most of power transformations are done, bring very big difficulty therefore for normal transmission or not operation, often burn out the accident of coil.According to incompletely statistics, general power supply unit all burns out separating brake every year on average or closing coil 8-10 is individual, and the transmission or not time that occasions a delay reaches more than 20 hour.Especially working as the electric power system power supply and fluctuateed, during large-area power-cuts, burn out as cause branch, closing coil because of operation, will be more serious to the influence of producing then.

Summary of the invention

The purpose of this utility model is exactly at the problems referred to above, provides a kind of sensitivity reliable, prevents the protective device that circuit breaker branch, closing coil burn out safely and effectively.

For this reason, technical solution adopted in the utility model is:

A kind of circuit-breaker switching on-off coil protector, comprise breaker closing, opening button SA, normally closed auxiliary contact QF1, closing coil HQ, often drive auxiliary contact QF2, switching winding TQ and D.C. contactor, be characterized in disconnecting normally closed contact in the time-delay of closing circuit, sub-gate circuit difference series direct current contactor; In the closing circuit, the current start auxiliary relay KAM1 that is connected with breaker closing button SA connects with closing circuit D.C. contactor normally closed contact TB1, the normally closed auxiliary contact QF1 of circuit breaker and closing coil HQ successively, and D.C. contactor TB is connected with time relay KT; In the sub-gate circuit, with sub-gate circuit D.C. contactor normally closed contact TB2, circuit breaker often opens auxiliary contact QF2 and switching winding TQ connects, D.C. contactor TB is connected with the time relay KT current start auxiliary relay KAM2 that is connected with breaker open operation button SA successively.

The beneficial effects of the utility model are:

Because connecting respectively to delay time at closing circuit, sub-gate circuit, the utility model disconnects normally closed contact, can minute, under the switching signal situation about not disappearing, time-delay disconnect to divide, the closing operation loop, makes branch, closing coil loss of excitation, avoids operating process branch, the long-time excitation of closing coil and burns out; Especially having an accident, under the unsuccessful situation that once trips, can secondary or repeatedly send the tripping operation pulse, make switch trip, the accident that effectively prevents enlarges.The utility model wiring is simple, is convenient to safeguard, and is safe and reliable, and small investment, instant effect, and can reduce the operating time, improve and are operable to power at extension coil useful life.Only 150 yuan of each relay prices, useful life is at 15-20; More the transducer set switching mechanism then needs about 160,000 yuan, and at every turn only more emat coil just need at least 2 hours, manually reach several thousand yuan of Master Costs, as the formation accident, then loss will be more serious.Therefore, the utlity model has higher economic value.

Description of drawings

Accompanying drawing is a circuit-breaker switching on-off coil protector winding diagram.

Among the figure: SA is breaker closing, cut the lock button, KAM1, KAM2 are respectively closing circuit current start auxiliary relay and sub-gate circuit current start auxiliary relay, TB1, TB2 are respectively the normally closed contact of string at the D.C. contactor TB of closing circuit and sub-gate circuit, QF1, QF2 are respectively the normally closed auxiliary contact in breaker closing loop and sub-gate circuit is often opened auxiliary contact, HQ is a closing coil, TQ is a switching winding, and KT is the time relay.

Embodiment

Below, in conjunction with the accompanying drawings the utility model is further described.By accompanying drawing as seen, the circuit breaker on the normally closed auxiliary contact QF1 of the circuit breaker on the closing circuit of the present utility model, closing coil HQ, the sub-gate circuit is often opened auxiliary contact QF2, switching winding TQ and two breaker closings, opening button SA all are that primary circuit has.The utility model is that connected respectively again on original closing circuit, the sub-gate circuit time-delay of D.C. contactor disconnects normally closed contact, promptly in closing circuit, current start auxiliary relay KAM1 that will be connected with breaker closing button SA and closing circuit D.C. contactor normally closed contact TB1, the normally closed auxiliary contact QF1 of circuit breaker and closing coil HQ are serially connected, and simultaneously D.C. contactor TB are connected with time relay KT.In sub-gate circuit, the current start auxiliary relay KAM2 that will be connected with breaker open operation button SA is with sub-gate circuit D.C. contactor normally closed contact TB2, circuit breaker often opens auxiliary contact QF2 and switching winding TQ connects, and D.C. contactor TB is connected on the time relay KT.

Adopt the above-mentioned mode of connection owing to disconnect normally closed contact in the time-delay of closing, connected respectively on the sub-gate circuit, make it close, under not disappearance of the sub-gate signal situation, time-delay disconnect close, the sub-switching operation loop, make close, switching winding loss of excitation outage and avoid burning out; Even and once tripping operation does not become, can also secondary or repeatedly send the tripping operation pulse, until combined floodgate, the sub-gate circuit disconnection of circuit breaker.

Claims

1, a kind of circuit-breaker switching on-off coil protector, comprise that breaker closing, opening button (SA), the normally closed auxiliary contact of circuit breaker (QF1), closing coil (HQ), circuit breaker often open auxiliary contact (QF2) and switching winding (TQ), it is characterized in that connecting respectively to delay time at closing circuit, sub-gate circuit disconnects normally closed contact; In the closing circuit, the current start auxiliary relay (KAM1) that is connected with breaker closing button (SA) is connected with D.C. contactor normally closed contact (TB1), the normally closed auxiliary contact of circuit breaker (QF1) and closing coil (HQ) successively, and D.C. contactor (TB) is connected with the time relay (KT); In the sub-gate circuit, the current start auxiliary relay (KAM2) that is connected with breaker open operation button (SA) often opens auxiliary contact (QF2) with D.C. contactor normally closed contact (TB2), circuit breaker successively and switching winding (TQ) is connected, and D.C. contactor (TB) is connected with the time relay (KT).