CN205303297U

CN205303297U - Gas circulation heating device of SF6 circuit breaker

Info

Publication number: CN205303297U
Application number: CN201521087297.6U
Authority: CN
Inventors: 牛天翔; 闫杰
Original assignee: SHAANXI HENGCHENG POWER TECHNOLOGY Co Ltd
Current assignee: SHAANXI HENGCHENG POWER TECHNOLOGY Co Ltd
Priority date: 2015-12-24
Filing date: 2015-12-24
Publication date: 2016-06-08
Anticipated expiration: 2025-12-24

Abstract

The utility model discloses a gas circulation heating device of SF6 circuit breaker, include the gas holder, heater, air pump and the supplementary jar that feed through with circuit breaker utmost point post, air pump and heater all set up inside the gas holder, and the air pump feeds through with circuit breaker utmost point post, installs first solenoid valve and second solenoid valve in the import of air pump respectively, is equipped with third solenoid valve and fourth solenoid valve on the gas delivery side of pump respectively, and first solenoid valve and fourth solenoid valve are all installed between the import of air pump and export, take the supplementary jar of piston to connect on the gas holder. The utility model discloses the piston that use to remove makes the volume of gas holder change, keeps its pressure unchangeable basically, has created good operating condition for the operation of air pump, but also the size of the supplementary jar of only need change, just can satisfy the not needs of the circuit breaker of equidimension for the product has the commonality, under the prerequisite that does not change circuit breaker structure and maintenance technology condition, heat the system reliably, simple structure, the installation is easy.

Description

A kind of SF6The gas circulating heater of chopper

Technical field

This utility model relates to power accessories field, specifically a kind of SF₆The gas circulating heater of chopper.

Background technology

Along with the development of power equipment manufacturing technology, SF₆Chopper possesses the advantages such as break performance excellence, maintenance workload is little, mechanism is stable because of it, is able to spread, North China primary cut-out SF in power system₆Equipment accounts for more than the 80% of armamentarium. 100% has been reached at the company 35kV having and above chopper oil-free rate.

But along with SF₆Chopper runs the increase of quantity and the time limit, and its latent defect also reveals gradually. SF₆Gas is as insulation and arc-extinguishing medium, its connecting-disconnecting function and SF₆The density of gas is relevant. SF₆Being a kind of macromole gas, liquefaction point is high, under the gas pressure of 0.6MPa, and SF₆Gas liquefaction temperature is-27 DEG C. It is to say, when ambient temperature is down to-27 DEG C, rated pressure is the SF of 0.6MPa₆In breaker body, gas will liquefy in a large number, cause that in arc-chutes, gas density reduces, breaking capacity of breaker declines. Now density monitor warning locking is " (locking) is reported to the police in liquefaction ", and now chopper cannot ensure connecting-disconnecting function.

At extremely frigid zones, winter temperature is very low, SF₆The phenomenon of chopper " low pressure alarming " and " liquefaction warning locking " is very general. For preventing because circuit breaker lock causes the pernicious power grid accident of power supply area large-area power-cuts, each electric company all carried out ensureing the technical measures of chopper cold operation, priority have employed replacing low form density monitor, employing mixes gas, by chopper brownout operation, the many kinds of measures such as chopper low pressure blocking function are cancelled even at cool period, ensure that chopper runs safety, but all without receiving good effect.

In order to solve SF₆Chopper (especially porcelain knob SF₆Chopper) Problems existing in extremely frigid zones is applied, switch manufacturing firm and power department have done a lot of trial, and current relatively common method has following several.

(1) mixing gas is used to replace SF₆Gas, is generally adopted SF₆And N₂Mixing gas as insulation and arc-extinguishing medium. Mixed proportion considers condensing temperature, insulating properties, these 3 factors of arc extinction performance, common are 50%SF₆+ 50%N₂And 60%SF₆+ 40%N₂. Although this method can reduce SF₆The condensing temperature of gas, but bring some problems to chopper maintenance and maintenance. Such as chopper leak detection, makes the sensitivity of leakage detecting instrument, accuracy be affected because its gas concentration changes. When using mixing gas, it is necessary to arc extinguishing nozzle in chopper is transformed, therefore, is not suitable for substantial amounts of online equipment.

(2) low pressure SF is used₆Equipment, this method reduces SF in arc-chutes exactly₆The pressure of gas, under the premise of arc-chutes constancy of volume, reduces pressure and means that reduction gas density, reduce arc extinguishing ability and the insulating capacity of chopper. Owing to insulating capacity reduces, so, in order to ensure the dielectric strength under same electric pressure, it is necessary for increasing safe distance to ensure its safety, the physical size that so certainly will make chopper increases, and therefore, the chopper manufacturing price of low form is far above normal chopper. Obviously this neither optimal way.

(3) breaker body is heated, the power department of domestic extremely frigid zones, including some high-voltage switch gear producers, all did similar trial, at SF₆Chopper installs electric heater additional at lower rod end. Although this heat protocol is simple, but its poor effect, and reason is the longer dimension of pole, and for LW36-126 chopper, height overall 4680mm, wherein pole part height is about 2400mm, SF₆Arc-chutes, on the top of pole, wherein have SF₆Gas is about 10Kg. Pole is not only thin but also high, and central link part is insulated tension pole, is the non-conductor of heat, therefore enough heats can not be transferred to SF₆In air chamber. This method is obviously also undesirable.

Therefore, it is badly in need of researching and developing a set of device that ensure that chopper cold operation.

By repeatedly studying, the work of the chopper interior injection gas at normal temperature reported to the police toward liquefaction during low temperature in the winter time takes a hint, if high-temperature gas is injected SF₆In arc-extinguishing chamber of circuit breaker so that it is temperature raises, and maintains more than condensing temperature, it is possible to solve this problem. On the basis of this thinking, inventor has manufactured and designed SF₆Gas automatic heating device, as illustrated in fig. 1 and 2, its principle is as follows: from arc-extinguishing chamber of circuit breaker 12 air-breathing, opening the first electromagnetic valve the 1, the 3rd electromagnetic valve 3, air pump 5, at this moment, gas is sucked out (from chopper sucking-off cold air) from chopper, gas in air accumulator 7 is heated, close air pump the 5, first electromagnetic valve the 1, the 3rd electromagnetic valve 3, open heater 6, the gas in air accumulator 7 is heated; Inflating to arc-extinguishing chamber of circuit breaker 12, close heater 6, open air pump the 5, second electromagnetic valve the 2, the 4th electromagnetic valve 4, gas is pushed back chopper (hot gas is pushed back chopper). Pass through SF₆The flowing of gas, is sent to heat in arc-extinguishing chamber of circuit breaker 12, makes gas temperature in arc-extinguishing chamber of circuit breaker 12 raise, liquefaction phenomenon does not occur, and therefore, the quantity of the flowing of gas and the gas of flowing, is the key of whole device.

Through test of many times, effect is less desirable, to the SF in chopper₆The effect of gas heating, depends entirely on the efficiency of air pump 5 and the volume of air accumulator 7, and the volume of air accumulator 7 is more big, the gas stored is more many, and the difference of arc-extinguishing chamber of circuit breaker 12 volume is more little, and effect is more good, otherwise effect is just poor, the size of chopper is very big, very heavy.It addition, in order to ensure to make SF₆Gas flows, and we have selected high performance air pump 5, but this air pump is expensive, costly.

For this situation, serious analysis, it is transformed, especially carried out improveing thoroughly to the working environment of air pump so that SF₆Gas can well circulate, it is possible to transmits more heat so that it is have more practical value.

Utility model content

The purpose of this utility model is in that to provide a kind of SF₆The gas circulating heater of chopper, with the problem solving to propose in above-mentioned background technology.

For achieving the above object, this utility model provides following technical scheme:

A kind of SF₆The gas circulating heater of chopper, including the air accumulator connected with circuit breaker polar, heater, air pump and auxiliary tank, described air pump is arranged on inside air accumulator, described heater is arranged on air accumulator inner bottom, described air pump connects with circuit breaker polar, the import of described air pump is separately installed with the first electromagnetic valve and the second electromagnetic valve, described gas delivery side of pump is respectively provided with the 3rd electromagnetic valve and the 4th electromagnetic valve, described first electromagnetic valve and the 4th electromagnetic valve are installed between the import of air pump and outlet, described second electromagnetic valve and the 3rd electromagnetic valve all connect with air accumulator, described auxiliary tank is connected on air accumulator, and is provided with moving piston on auxiliary tank.

As further program of the utility model: described air accumulator and air pump are connected with circuit breaker polar by same pipeline.

Compared with prior art, the beneficial effects of the utility model are: this utility model passes through a transportable piston, makes the volume of air accumulator change, keeps its pressure to be basically unchanged, and the operation for air pump creates good working condition; External hanging type piston auxiliary tank, it is only necessary to change the size of auxiliary tank, it is possible to meet the needs of different size of chopper so that product has versatility; Under the premise not changing breaker structure and maintenance technology condition, reliably system is heated; With SF₆Chopper only one of which junction point, installs easily.

Accompanying drawing explanation

Fig. 1 is SF₆The gas-heating apparatus schematic diagram of chopper.

Fig. 2 is SF₆The internal structure schematic diagram of air accumulator in the gas-heating apparatus of chopper.

Fig. 3 is SF₆The structural representation of the gas circulating heater of chopper.

In figure: 1-the first electromagnetic valve; 2-the second electromagnetic valve; 3-the 3rd electromagnetic valve; 4-the 4th electromagnetic valve; 5-air pump; 6-heater; 7-air accumulator; 8-auxiliary tank; 9-moving piston; 10-circuit breaker polar; 11-pipeline; 12-arc-extinguishing chamber of circuit breaker.

Detailed description of the invention

Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments. Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.

Refer to Fig. 3, in this utility model embodiment, a kind of SF₆The gas circulating heater of chopper, including the air accumulator 7 connected with circuit breaker polar 10, heater 6, air pump 5 and auxiliary tank 8, it is internal that air pump 5 is arranged on air accumulator 7, heater 6 is arranged on air accumulator 7 inner bottom, air pump 5 connects with circuit breaker polar 10, and air accumulator 7 and air pump 5 are connected with circuit breaker polar 10 by same pipeline;The import of air pump 5 is separately installed with the first electromagnetic valve 1 and the second electromagnetic valve 2, the outlet of air pump 5 is respectively provided with the 3rd electromagnetic valve 3 and the 4th electromagnetic valve 4, first electromagnetic valve 1 and the 4th electromagnetic valve 4 are installed between the import of air pump 5 and outlet, and the second electromagnetic valve 2 all connects with air accumulator 7 with the 3rd electromagnetic valve 3; Auxiliary tank 8 is connected on air accumulator 7, and is provided with moving piston 9 on auxiliary tank 8.

The specific works step of this utility model gas circulating heater is as follows:

(1) inflate to chopper side

Second electromagnetic valve the 2, the 4th electromagnetic valve 4 closes, and air pump 5 runs, and gas flows to chopper direction, and heat transmission starts; Chopper one lateral pressure raises, and air accumulator 7 one lateral pressure begins to decline, and moving piston 9, under suction, moves inward, and air accumulator 7 pressure reduces, but the amplitude reduced is only small, and air pump 5 is still in good working condition, can normal operation;

Moving piston 9 reaches the limit of position, stop motion, and chopper and air accumulator 7 pressure differential are rapidly reached the limit, and gas flowing stops, and heat transmits and stops.

(2) air-breathing from chopper

First electromagnetic valve the 1, the 3rd electromagnetic valve 3 closes, and air pump 5 runs, and gas flows to air accumulator 7 side, and air-breathing starts;

Air accumulator 7 one lateral pressure starts to raise, but owing to moving piston 9 is displaced outwardly, volume increases, and it is relatively slow that air accumulator 7 pressure raises, and air pump 5 is in good working condition, it is possible to normal operation;

Moving piston 9 arrives outermost extreme position, stops mobile, and under air pump effect, in air accumulator 7, pressure raises rapidly, reaches the limit condition of operation of air pump 5, and gas flowing stops, and air-breathing stops.

By analyzing above, when air pump 5 is inflated from air accumulator 7 to chopper, outflow along with air accumulator 7 gas, its volume is also progressively reducing so that in air accumulator 7, pressure can keep being basically unchanged, so, significantly improve the working condition of air pump 5, more gas can be carried, carry more heat to arc-extinguishing chamber of circuit breaker, stop SF therein₆Gas, liquefies under extremely cold condition.

It is obvious to a person skilled in the art that this utility model is not limited to the details of above-mentioned one exemplary embodiment, and when without departing substantially from spirit of the present utility model or basic feature, it is possible to realize this utility model in other specific forms. Therefore, no matter from which point, embodiment all should be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims rather than described above, it is intended that all changes in the implication of the equivalency dropping on claim and scope included in this utility model. Any accompanying drawing labelling in claim should be considered as the claim that restriction is involved.

Claims

1. a SF₆The gas circulating heater of chopper, including the air accumulator connected with circuit breaker polar, heater, air pump and auxiliary tank, described air pump is arranged on inside air accumulator, described heater is arranged on air accumulator inner bottom, described air pump connects with circuit breaker polar, it is characterized in that, the import of described air pump is separately installed with the first electromagnetic valve and the second electromagnetic valve, described gas delivery side of pump is respectively provided with the 3rd electromagnetic valve and the 4th electromagnetic valve, described first electromagnetic valve and the 4th electromagnetic valve are installed between the import of air pump and outlet, described second electromagnetic valve and the 3rd electromagnetic valve all connect with air accumulator,Described auxiliary tank is connected on air accumulator, and is provided with moving piston on auxiliary tank.

2. SF according to claim 1₆The gas circulating heater of chopper, it is characterised in that described air accumulator and air pump are connected with circuit breaker polar by same pipeline.