CN201629258U

CN201629258U - Low SF6 gas pressure blocking control loop of high-voltage circuit breaker

Info

Publication number: CN201629258U
Application number: CN2010202604357U
Authority: CN
Inventors: 梁海峰
Original assignee: HENAN ELECTRIC POWER Co LUOHE POWER SUPPLY BRANCH
Current assignee: HENAN ELECTRIC POWER Co LUOHE POWER SUPPLY BRANCH
Priority date: 2010-07-16
Filing date: 2010-07-16
Publication date: 2010-11-10
Anticipated expiration: 2020-07-16

Abstract

The utility model discloses a low SF6 gas pressure blocking control loop of a high-voltage circuit breaker, which comprises a closing loop, an opening loop, an SF6 gas replenishing signal loop and an SF6 gas abnormal blocking loop. The closing loop consists of a closing coil K1, a normally closed contact of a circuit breaker auxiliary switch Q and a closing button SB1, the opening loop consists of an opening coil K2, a normally open contact of the circuit breaker auxiliary switch Q and an opening button SB2, the SF6 gas replenishing signal loop consists of a normally closed contact of an SF6 density relay KD and a signal indicator lamp HL3, and the SF6 gas abnormal blocking loop consists of another normally closed contact of the SF6 density relay and an intermediate relay KL which are in series connection. During working, when an SF6 gas pressure density chamber is filled with gas to meet requirements of arc extinction, the normally closed contact of the density relay KD is opened, when SF6 gas pressure drops and does not meet the requirements of the arc extinction, the normally closed contact of the density relay KD is reset, the intermediate relay KL serially connected with the normally closed contact is electrified, two groups of normally closed contacts of the intermediate relay which are connected in the opening loop and the closing loop are opened, and then the opening loop and the closing loop of the circuit breaker are both switched off so that opening and closing operation can not realized, thereby realizing a low SF6 gas pressure blocking function, and achieving the purpose of protecting the circuit breaker.

Description

Primary cut-out SF 6Air pressure hangs down the locking control loop

Technical field

The utility model relates to the SF in a kind of high-voltage fence ₆The SF of primary cut-out, particularly primary cut-out ₆Air pressure hangs down the locking control loop.

Background technology

Primary cut-out is in operation when carrying out sub-switching operation, and the major loop switch contact disconnects and can produce arc phenomenon, burns out switch easily, and elongated break time.In order to make the reliable separating brake of switch, normally adopt the inert gas SF that has height discreteness and insulating properties and certain density and pressure need be arranged ₆Gas carries out arc extinguishing, to guarantee switch safety.The primary cut-out of extensive use at present utilizes SF exactly ₆The gas arc quenching principle carries out arc extinguishing.But utilize SF ₆The primary cut-out that gas carries out arc extinguishing lacks the locking facility, when circuit breaker is in operation, if inert gas SF6 density in the circuit breaker and pressure are reduced in the time of can not satisfying the arc extinguishing needs, can not in time find again and carries out tonifying Qi so that SF ₆When density and pressure were reduced to certain value, locking can not be realized in the circuit-breaker switching on-off loop.If at this moment circuit breaker is carried out breaking-closing operating, may be owing to the arc extinguishing failure causes equipment explosion, causes serious accident, promptly allow to timely discovery and also will handle, greatly reduce the reliability of power supply, and can bring enormous economic loss by having a power failure after the transfer load.

Summary of the invention

The utility model is in operation when carrying out sub-switching operation and can not locking causes the problem of equipment explosion easily in order to solve present primary cut-out, provides a kind of primary cut-out SF6 air pressure to hang down the locking control loop, thereby realizes SF ₆Air pressure hangs down blocking function, avoids SF ₆Switch circuit when air pressure reduces fault that is short-circuited, and cause switchgear to damage.

The technical problems to be solved in the utility model is achieved through the following technical solutions.

This primary cut-out SF ₆Air pressure hangs down the locking control loop, comprises closing coil K ₁, switching winding K2, auxiliary switch for circuit breaker Q, switch knob SB ₁, opening button SB ₂, SF ₆Density monitor KD two normally-closed contacts and signal lamp HL ₁～HL ₃Described closing coil K ₁, auxiliary switch for circuit breaker Q normally-closed contact and switch knob SB ₁Form closing circuit; Described closing coil K ₁, auxiliary switch for circuit breaker Q normally-closed contact and signal lamp HL ₁Form the sub-gate signal loop; Described switching winding K ₂, auxiliary switch for circuit breaker Q normally opened contact and opening button SB ₂Form sub-gate circuit; Described switching winding K ₂, auxiliary switch for circuit breaker Q normally opened contact and signal lamp HL ₂Form the switching signal loop; Described SF ₆Density monitor KD one normally-closed contact and signal lamp HL ₃Form SF ₆Gas tonifying Qi signal circuit is characterized in: described another SF ₆Density monitor KD normally-closed contact series connection SF ₆The low locking auxiliary relay KL of air pressure forms SF ₆The gas anomaly locked loop, and two groups of normally closed contacts of described auxiliary relay KL are connected respectively insert in closing circuit and the sub-gate circuit.SF in the work ₆Air pressure density chamber is inflated to when satisfying the arc extinguishing needs, SF ₆The normally-closed contact of density monitor KD is opened; Work as SF ₆Air pressure is reduced in the time of can not satisfying the arc extinguishing needs, SF ₆The normally-closed contact of density monitor KD resets, and the auxiliary relay KL of series connection with it connects electricity, and the latter seals in two groups of normally closed contacts of branch, closing circuit and opens, and circuit breaker branch, closing circuit all disconnect and can not carry out breaking-closing operating, thereby have realized SF ₆Air pressure hangs down blocking function, has reached the purpose of protective circuit breaker.

The SF of this primary cut-out ₆Another technical scheme of the low locking control loop of air pressure is the normally opened contact S that is in series with motor spring energy-storage operating mechanism in the closing circuit in such scheme.This measure for fear of circuit breaker contact of auxiliary switch in operating process stuck or other problem appears and cause closing coil long charged cause burning be provided with.

This primary cut-out SF ₆The low locking control loop of air pressure has solved present primary cut-out and has been in operation when carrying out sub-switching operation and can not locking causes the problem of equipment explosion, has realized SF ₆Air pressure hangs down blocking function.When circuit breaker gas leakage or long-play take place caused air pressure to reduce, the operations staff can in time find to handle, and has eliminated SF ₆The danger of the low divide-shut brake of air pressure has improved operation stability of equipment widely.

Description of drawings

Accompanying drawing is an electrical schematic diagram of the present utility model.

Embodiment

Further introduce embodiment of the present utility model below in conjunction with accompanying drawing.

As shown in drawings, the SF of this primary cut-out ₆The low locking control loop of air pressure is mainly by closing coil K ₁, switching winding K ₂, a pair of normally opened contact of auxiliary switch for circuit breaker Q and a pair of normally-closed contact, motor spring energy-storage operating mechanism normally opened contact S, SF ₆The low locking auxiliary relay KL of air pressure and two groups of normally-closed contacts thereof, switch knob SB ₁, opening button SB ₂, signal lamp HL ₁～HL ₃, SF ₆Density monitor normally-closed contact KD and DC power supply (figure be shown with power supply both positive and negative polarity+KM ,-composition such as KM).

Closing coil K ₁, the normally-closed contact of auxiliary switch for circuit breaker Q, motor spring energy-storage operating mechanism normally opened contact S, SF ₆Low locking auxiliary relay KL normally-closed contact of air pressure and switch knob SB ₁Form closing circuit Above-mentioned components and parts remove switch knob SB ₁Outer and signal lamp HL ₁Formed the sub-gate signal loop again Its course of action is that primary cut-out qi of chong channel ascending adversely secret room charges into SF ₆Air pressure is to satisfying the arc extinguishing needs ,SF ₆The density monitor normally-closed contact KDOften be converted to and open.Starter motor spring energy-storage operating mechanism afterwards, its normally opened contact S closure.Press switch knob SB ₁Connect closing circuit, the circuit breaker action is converted to combined floodgate by separating brake, and operating mechanism makes the normally-closed contact of closing circuit auxiliary switch Q disconnect the normally opened contact closure of sub-gate circuit auxiliary switch Q, power connection switching winding K simultaneously ₂, connect the closing contact of auxiliary switch Q to switching signal indicator light HL ₂Light, finish whole making process.

Switching winding K ₂, auxiliary switch for circuit breaker Q normally opened contact ,SF ₆Low locking auxiliary relay KL normally-closed contact of air pressure and opening button SB ₂Form sub-gate circuit; Above-mentioned components and parts remove opening button SB ₂Outer and switching signal indicator light HL ₂Formed the switching signal loop again; Its course of action is, presses opening button SB2, and opening button is passed through SB ₂Button connects SF ₆Air pressure hangs down locking auxiliary relay KL normally-closed contact, auxiliary switch Q closed contact and switching winding K ₂Energized, the circuit breaker action is converted to separating brake by combined floodgate, and sub-gate circuit auxiliary switch Q contact disconnects simultaneously, the closing circuit auxiliary switch Q closing of contact, power supply is by closing coil K ₁The closing contact that connects auxiliary switch Q is to sub-gate signal indicator light HL ₁Light, finish the separating brake process.

SF ₆Density switch relay KD normally-closed contact and signal lamp HL ₃Form SF ₆Gas tonifying Qi signal circuit; Another SF ₆Density monitor KD normally-closed contact series connection SF ₆The low locking auxiliary relay KL of air pressure forms SF ₆The gas anomaly locked loop.

Work as SF ₆Air pressure is reduced to when being not enough to arc extinguishing, SF ₆Density monitor KD normally-closed contact resets SF ₆The low locking auxiliary relay KL of air pressure starts, and two groups of normally closed contacts that its series connection inserts branch, closing circuit are opened, and circuit breaker branch, closing circuit all disconnect and can not carry out breaking-closing operating, thereby have realized SF ₆Air pressure hangs down blocking function, has reached the purpose of protective circuit breaker.

Stuck or other problem occurs and cause long charged causing of closing coil to burn for fear of primary cut-out contact of auxiliary switch in operating process, in closing circuit, sealed in the normally opened contact S of motor spring energy-storage operating mechanism. ?

Claims

1. the SF of a primary cut-out ₆Air pressure hangs down the locking control loop, comprises closing coil K ₁, switching winding K ₂, auxiliary switch for circuit breaker Q, switch knob SB ₁, opening button SB ₂, SF ₆Density monitor KD two normally-closed contacts and signal lamp HL ₁～HL ₃Described closing coil K ₁, auxiliary switch for circuit breaker Q normally-closed contact and switch knob SB ₁Form closing circuit; Described closing coil K ₁, auxiliary switch for circuit breaker Q normally-closed contact and signal lamp HL ₁Form the sub-gate signal loop; Described switching winding K ₂, auxiliary switch for circuit breaker Q normally opened contact and opening button SB ₂Form sub-gate circuit; Described switching winding K ₂, auxiliary switch for circuit breaker Q normally opened contact and signal lamp HL ₂Form the switching signal loop; Described SF ₆Density monitor KD one normally-closed contact and signal lamp HL ₃Form SF ₆Gas tonifying Qi signal circuit is characterized in that: described another SF ₆Density monitor KD normally-closed contact series connection SF ₆The low locking auxiliary relay KL of air pressure forms SF ₆The gas anomaly locked loop, and two groups of normally-closed contacts of described auxiliary relay KL are connected respectively insert in closing circuit and the sub-gate circuit.

2. the SF of primary cut-out according to claim 1 ₆Air pressure hangs down the locking control loop, it is characterized in that: the normally opened contact S that is in series with motor spring energy-storage operating mechanism in the described closing circuit.