CN205070275U - In put cabinet circuit breaker handcart shutting return circuit of closing a floodgate - Google Patents

Abstract

The utility model provides an in put cabinet circuit breaker handcart shutting return circuit of closing a floodgate, the circuit breaker closing coils HQ of circuit breaker energy storage auxiliary contact NO -contact CN, circuit breaker auxiliary contact normally closed contact DL and the series connection with it of relay normally closed contact KO and series connection with it is prevented jumping including circuit breaker mechanism, its structural feature is: handcart test position auxiliary contact normally closed contact S8 and the handcart operating position auxiliary contact NO -contact S9 between circuit breaker energy storage auxiliary contact NO -contact CN and circuit breaker auxiliary contact normally closed contact DL still concatenate after connecting in parallel. The utility model discloses eliminated and closed a floodgate the shutting return circuit among the prior art to combined floodgate block relay S2's quality and operating condition's reliance to can obviously promote the shutting return circuit reliability of operation of closing a floodgate, simultaneously, can prevent effectively that the handcart propelling movement from insufficient and arouse the accident at the breaker closing in -process to operating position.

Description

A kind of central cabinet circuit breaker handcart closing locking circuit

Technical field

The utility model relates to power distribution network middle-placed switch cabinet auxiliary protection facility, is specifically related to a kind of central cabinet circuit breaker handcart closing locking circuit.

Background technology

In distribution network, middle-placed switch cabinet handcart structure is used widely.If at circuit breaker cart toward in interior propelling movement process, fail completely, fully circuit breaker to be pushed to service position, when causing the loose contact of circuit breaker one-time contact, in switch making process, can atmospherical discharges be caused, cause contact ablation even to explode.Occur to prevent this type of situation, middle-placed switch cabinet is designed with closing locking circuit usually in its switching mechanism (in as Fig. 1 shown in empty frame part), shown in common central cabinet circuit breaker handcart closing locking circuit thickened portion as in-house in Fig. 1 breaker in middle, it is by closing locking relay S2, auxiliary contacts of circuit breaker normally closed contact DL and handcart test position auxiliary contact normally closed contact S8 and handcart work location aided rebroadcast contact normal opened contact S9 composes in series, the operation principle of this kind of closing locking circuit is: when switching mechanism push to service position insufficient time, handcart test position auxiliary contact normally closed contact S8 and handcart work location aided rebroadcast contact normal opened contact S9 is all in off-state, closing locking relay S2 is failure to actuate, closing coil HQ cannot form galvanic circle, circuit breaker cannot electric switch-on, can only be processed by professional maintainer, thus reach the object of Accident prevention generation.

Aforesaid closing locking circuit is when each components and parts are intact, and reliable effect, can effective Accident prevention.But, in actual motion statistics, because closing locking relay S2 is subject to the impact of useful life itself and condition of work (powered for a long time), find the operation of closing locking relay S2 through 5-6, start to occur damaging, thereafter along with passage of time, the probability that closing locking relay S2 scraps damage is increasing, and quantity gets more and more.After closing locking relay S2 damages, if circuit breaker is in a point position, the early warning in time of " control loop template " alarm signal energy, maintainer can process in time; But in electrical network actual motion, the circuit breaker being in standby spacing is in outside point position, and the circuit breaker major part of running status is in closing position.When closing locking relay S2 damages, if circuit breaker is at closing position, will without any signal real-time early warning, process can only be rushed to repair after switch separating brake, and the line segregation enabling " reclosing " function can not overlap in transient fault, cause power supply reliability to reduce, cause power failure and economic loss.

Utility model content

The purpose of this utility model is: for Problems existing in background technology, provide a kind of structure simple, arrange conveniently, effectively can improve functional reliability thus the central cabinet circuit breaker handcart closing locking circuit of safeguard work safety when using.

The technical solution of the utility model is: central cabinet circuit breaker handcart closing locking circuit of the present utility model, comprises breaker mechanism anti-trip relay normally closed contact KO, breaker energy storage auxiliary contact normal opened contact CN, auxiliary contacts of circuit breaker normally closed contact DL and breaker closing coil HQ; Described breaker energy storage auxiliary contact normal opened contact CN connects with breaker mechanism anti-trip relay normally closed contact KO; Breaker closing coil HQ connects with auxiliary contacts of circuit breaker normally closed contact DL; Its design feature is:

Also comprise handcart test position auxiliary contact normally closed contact S8 and handcart work location aided rebroadcast contact normal opened contact S9; After described handcart test position auxiliary contact normally closed contact S8 and the normal opened contact S9 parallel connection of handcart work location aided rebroadcast contact, be serially connected between breaker energy storage auxiliary contact normal opened contact CN and auxiliary contacts of circuit breaker normally closed contact DL.

The utility model has positive effect: central cabinet circuit breaker handcart closing locking circuit of the present utility model, it is by directly sealing in the closing circuit of central cabinet circuit breaker by handcart test position auxiliary contact normally closed contact S8 and handcart work location aided rebroadcast contact normal opened contact S9, eliminate closing locking relay S2, eliminate the quality of closing locking circuit to combined floodgate blocking relay S2 and the dependence of operating state in prior art, thus can obviously promote closing locking circuit reliability of operation; Meanwhile, can effectively prevent handcart from pushing to service position insufficient and cause accident in breaker closing process.

Accompanying drawing explanation

Fig. 1 is the structural representation of a kind of central cabinet circuit breaker handcart closing locking circuit of prior art;

Fig. 2 is the structural representation of central cabinet circuit breaker handcart closing locking circuit of the present utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.

(embodiment 1)

See Fig. 2, the central cabinet circuit breaker handcart closing locking circuit of the present embodiment, it is made up of breaker mechanism anti-trip relay normally closed contact KO, breaker energy storage auxiliary contact normal opened contact CN, handcart test position auxiliary contact normally closed contact S8, handcart work location aided rebroadcast contact normal opened contact S9, auxiliary contacts of circuit breaker normally closed contact DL and breaker closing coil HQ.

Aforesaid breaker energy storage auxiliary contact normal opened contact CN connects with breaker mechanism anti-trip relay normally closed contact KO; Breaker closing coil HQ connects with auxiliary contacts of circuit breaker normally closed contact DL; After handcart test position auxiliary contact normally closed contact S8 and the normal opened contact S9 parallel connection of handcart work location aided rebroadcast contact, be serially connected between breaker energy storage auxiliary contact normal opened contact CN and auxiliary contacts of circuit breaker normally closed contact DL.

The central cabinet circuit breaker handcart closing locking circuit of the present embodiment, it eliminates closing locking relay S2 of the prior art as shown in Figure 1, by directly sealing in handcart test position auxiliary contact normally closed contact S8 in the closing circuit in killer switch mechanism and handcart work location aided rebroadcast contact normal opened contact S9 is achieved.

The central cabinet circuit breaker handcart closing locking circuit of the present embodiment, it is by directly sealing in the closing circuit of central cabinet circuit breaker by handcart test position auxiliary contact normally closed contact S8 and handcart work location aided rebroadcast contact normal opened contact S9, eliminate closing locking relay S2, although the design still relies on the quality of handcart test position auxiliary contact normally closed contact S8 and handcart work location aided rebroadcast contact normal opened contact S9, (this type of auxiliary contact is through practice operation, the stable performance of more than 10 years, substantially damage is had no), but be a cancellation the quality of closing locking circuit to combined floodgate blocking relay S2 and the dependence of operating state in prior art, thus can obviously promote closing locking circuit reliability of operation, meanwhile, can effectively prevent handcart from pushing to service position insufficient and cause accident in breaker closing process.

Above embodiment is the explanation to embodiment of the present utility model; but not to restriction of the present utility model; person skilled in the relevant technique is not when departing from spirit and scope of the present utility model; can also make various conversion and change and obtain corresponding equivalent technical scheme, therefore all equivalent technical schemes all should be included into scope of patent protection of the present utility model.

Claims (1)

1. a central cabinet circuit breaker handcart closing locking circuit, comprises breaker mechanism anti-trip relay normally closed contact KO, breaker energy storage auxiliary contact normal opened contact CN, auxiliary contacts of circuit breaker normally closed contact DL and breaker closing coil HQ; Described breaker energy storage auxiliary contact normal opened contact CN connects with breaker mechanism anti-trip relay normally closed contact KO; Breaker closing coil HQ connects with auxiliary contacts of circuit breaker normally closed contact DL; It is characterized in that:

Also comprise handcart test position auxiliary contact normally closed contact S8 and handcart work location aided rebroadcast contact normal opened contact S9; After described handcart test position auxiliary contact normally closed contact S8 and the normal opened contact S9 parallel connection of handcart work location aided rebroadcast contact, be serially connected between breaker energy storage auxiliary contact normal opened contact CN and auxiliary contacts of circuit breaker normally closed contact DL.