CN101572139A

CN101572139A - Sulfur hexafluoride circuit breaker porcelain bottle and manufacturing process thereof

Info

Publication number: CN101572139A
Application number: CNA2009100436734A
Authority: CN
Inventors: 文作运; 邱水江; 吴金奇
Original assignee: ZHUZHOU GAOTE PORCELAIN FACTORY
Current assignee: ZHUZHOU GAOTE PORCELAIN FACTORY
Priority date: 2009-06-12
Filing date: 2009-06-12
Publication date: 2009-11-04
Anticipated expiration: 2029-06-12
Also published as: CN101572139B

Abstract

The invention relates to a sulfur hexafluoride circuit breaker, in particular to a sulfur hexafluoride circuit breaker porcelain bottle and a manufacturing process thereof. The bottle is obtained by blending and firing hydromica clay, kaolin, feldspar, bonding clay and artificial mullite, wherein concrete components and mixture ratios are: 3.8 to 4.2 percent of K2O and Na2O, 70 to 72 percent of SiO2, 23 to 25 percent of Al2O3, less than 1.0 percent of Fe2O3, and less than 0.1 percent of TiO2. The process comprises a concrete course as follows: proportioning materials; ball-milling the materials; discharging pulp; performing sieving; refining clay; molding clay; drying clay; glazing blanks; firing the blanks; and taking the obtained products out from a kiln. The invention has the advantages that the products of the invention all meet national standard GB772-2005 and product pattern requirements, have mechanical properties completely meeting requirements, are large in margin and free from the phenomenon that porcelain bushings crack during assembly, and are fundamentally improved in air tightness.

Description

A kind of sulfur hexafluoride circuit breaker porcelain bottle and manufacture craft thereof

Technical field

The present invention relates to a kind of sulfur hexafluoride breaker, particularly relate to a kind of sulfur hexafluoride circuit breaker porcelain bottle and manufacturing process thereof.

Background technology

Utilize sulphur hexafluoride (SF ₆) gas is as a kind of circuit breaker of arc-extinguishing medium and dielectric.Be called for short SF ₆Circuit breaker.Sulphur hexafluoride starts from early 1950s as arc-extinguishing medium in the circuit breaker.Because the excellent specific property of this gas makes this circuit breaker single break be much higher than compressed-air circuit breaker and oil-minimum breaker aspect the voltage and current parameter, and does not need high air pressure and considerable series connection fracture number.In 60～seventies, SF ₆Circuit breaker has been widely used in the superhigh pressure bulk power system.Succeeded in developing the SF that 363 kilovolts of single breaks, 550 kilovolts of double break mouths and specified drop-out current reach 80,100 kilo-amperes the beginning of the eighties ₆Circuit breaker.

SF ₆Characteristic: SF ₆Gas is heavier than air 5.135 times, and during an atmospheric pressure, its boiling point is-60 ℃.Below 150 ℃ the time, SF ₆Good chemical inertness is arranged, not with circuit breaker in commonly used metal, plastics and other material generation chemical actions.When resolving into various heterogeneity under the high temperature that large power electric arc causes, the utmost point behind the arc extinction can synthesize again in the short time again.SF ₆In do not have carbon, do not have air to exist, can avoid the contact oxidation.SF ₆Dielectric strength very high, and increasing and increase with pressure.Under 1 atmospheric pressure, SF ₆Dielectric strength approximate 2～3 times of air.When absolute pressure is 3 atmospheric pressure, SF ₆Dielectric strength can meet or exceed insulating oil commonly used.SF ₆Arc extinction performance is good, and in arc control device that simply cut-off, its arc extinguishing energy force rate air is big 100 times.At SF ₆In, when arc current near zero the time, only very high temperature is arranged in the heart, and is non-conductive layer around it at the very little arc column of diameter.Like this, behind the current over-zero, the arc gap dielectric strength is with very fast recovery.

Version: SF ₆Circuit breaker has two kinds of structural arrangement forms.

1. porcelain knob structure: get cordwood system type, series is strong, and available a plurality of identical unit arc control device and strut porcelain bushing are formed the circuit breaker of different electric pressures.China FA4-550 type SF ₆Circuit breaker is the porcelain knob structure, and its rated voltage is 500 kilovolts, and maximum operating voltage is 550 kilovolts.Circuit breaker is made up of three separate single-phase and hydraulic pressure, an electrical control cabinet.Every four arc control device (fracture) by two strut porcelain bushings are in series.Adorning two unit arc control device at each strut porcelain bushing top, is that 120 ° of angle V-arrangements are arranged, all presses shunt capacitor to be arranged horizontally for two.This structural configuration had both been considered the mechanical stress state of structure, looked after the requirement of insulation again.All be filled with the SF of rated pressure in arc control device and the strut porcelain bushing ₆Gas.Porcelain knob breaker uses hydraulic operating mechanism.The control of hydraulic mechanism and executive component and circuit all are located in the control cubicle.The dynamical element of a cover hydraulic mechanism is equipped with in the bottom of every phase circuit breaker, as the hydraulic cylinder etc.Arc control device are by the direct actuating of hydraulic cylinder.Insulating bar is housed in the strut porcelain bushing, and action bars is connected with the hydraulic cylinder.

2. pot type structure: adopted the advantage of box bulk-oil circuit-breaker, circuit breaker and instrument transformer have been fitted together, compact conformation, antiseismic and antifouling ability is strong, but series is relatively poor.China LW-220 type pot type SF ₆The circuit breaker phase structure is as figure.This kind circuit breaker is the three-phase separately loading.Single-phasely form by pedestal, insulating porcelain bushing, current transformer and housing that the single break arc control device are housed.Every be furnished with hydraulic mechanism and a control cubicle mutually, can operate separately, and can carry out three-phase operation by electrical control.Circuit breaker adopts two-way indulging to blow the formula arc control device, during separating brake, by the connecting lever box transmission mechanism, drives the motion of cylinder and moving contact.

The LW3 sulfur hexafluoride breaker is the electrical equipment of new generation of China's nineteen nineties research and development, be widely used in 10KV, 12.5KV, 20KV circuit, play a significant role to improving line security and remote operation, but because insulation is required high mechanical properties and high-air-tightness with porcelain vase, be difficult to domestic a period of time produce, initial stage of development is had to from external import, and the nineties later stage begins to make this series products with high alumina high strength prescription, to substitute import.Use Al ₂O ₃The high alumina high strength prescription of the bauxite preparation of content more than 85%, its Al ₂O ₃Content can be up to 35%～45%, and mechanical strength is very high, owing to contain Fe in the bauxite ₂O ₃, TiO ₂Make and form ferrotitanium spinelle and corundum coarse-grain after the roasting of porcelain spare in the porcelain body, and make porcelain fragility produce microfissure and ferrotitanium fusion hole than big and coarse-grain edge, cause porcelain vase in use to leak air, reflect according to producer, the porcelain vase leak rate that has generally also reaches 1%～3% up to 5%～10%, and bursts apart owing to easily producing in the assembling of porcelain embrittlement.Use producer to require to improve rapidly quality.

Summary of the invention

One of purpose of the present invention just provides a kind of sulfur hexafluoride circuit breaker porcelain bottle, improve the insulator air-tightness, overcome porcelain spare interior microscopic crackle and fusion hole, reduce and overcome open circuit the gas assembling and use in gas leakage, under the prerequisite that guarantees mechanical strength, increase the toughness of porcelain simultaneously, prevent that porcelain spare from bursting apart.

Two of purpose of the present invention just provides a kind of manufacture method of above-mentioned porcelain vase.

Purpose one of the present invention realizes that by following approach it is to adopt hydromica class clay, kaolin, feldspar, bonding clay, the allotment of artificial mullite to fire and form, and concrete component and proportioning are: K ₂O, Na ₂O:3.8～4.2%, SiO ₂: 70～72%, Al ₂O ₃: 23～25%, Fe ₂O ₃: TiO＜1.0%, ₂:＜0.1%.

Purpose two of the present invention realizes by following approach, its specific embodiment is, batching → ball milling → blowing → sieve → pugging → moulding → drying → glazed body → fire → kiln discharge, wherein, in the ball milling operation, the raw material ball grinding rate is strict controlled in 250 orders/time sieve, tails over rate 0.8～1.2%; In the pugging operation, vacuum degree＞0.096Mpa.

Product of the present invention all meets standard GB 772-2005 and product design document requirement; Mechanical performance reaches requirement fully, and nargin is bigger, and the no insulator phenomenon of bursting apart in the assembling; The air-tightness of product obtains fundamental turn for the better.

Embodiment

Describe the specific embodiment of the present invention below in detail.

The present invention adopts the artificial mullite allotment in kaolin, Pingjiang River feldspar, Fujian bonding clay, the Hunan in hydromica class clay, Heng Shan of Liling to fire and forms, and concrete component and proportioning are: K ₂O, Na ₂O:3.8～4.2%, SiO ₂: 70～72%, Al ₂O ₃: 23～25%, Fe ₂O ₃: TiO＜1.0%, ₂:＜0.1%.

Artificial mullite is to adopt flint clay to process the artificial mullite Al that makes ₂O ₃Content is at 63-66%, and its mullite crystal content is at 58-62%.

In the microstructure of insulator base substrate, mullite crystal content is 30～35%, and residual quartz crystal 3 0%, vitreum content 30～35%, gas content are below 5%, and mullite crystal is small, elongated, can't see micro-crack and fusion hole.

Specific embodiment of the present invention is, batching → ball milling → blowing → sieve → pugging → moulding → drying → glazed body → fire → kiln discharge, wherein, in the ball milling operation, the raw material ball grinding rate be strict controlled in 250 orders/time sieve, tail over rate 0.8～1.2%; In the pugging operation, vacuum degree＞0.096Mpa.

The chemical analysis of the prescription of ordinary production is now: K ₂O ₂, Na ₂O:3.9%, SiO ₂: Al 71%, ₂O ₃: Fe 23.5%, ₂O ₃: 0.8%, CaO, MgO:1.5%, TiO ₂: trace.

Claims

1, a kind of sulfur hexafluoride circuit breaker porcelain bottle is characterized in that, it is to adopt hydromica class clay, kaolin, feldspar, bonding clay and the allotment of artificial mullite to fire to form, and its concrete composition and content are: K ₂O, Na ₂O:3.8～4.2%, SiO ₂: 70～72%, Al ₂O ₃: 23～25%, Fe ₂O ₃: TiO＜1.0%, ₂:＜0.1%.

2, a kind of sulfur hexafluoride circuit breaker porcelain bottle according to claim 1 is characterized in that described artificial mullite is to adopt flint clay to process the artificial mullite Al that makes ₂O ₃Content is at 63-66%, and its mullite crystal content is at 58-62%.

3, a kind of sulfur hexafluoride circuit breaker porcelain bottle according to claim 1 is characterized in that in the microstructure of insulator base substrate, and mullite crystal content is 30～35%, residual quartz crystal 3 0%, and vitreum content 30～35%, gas content is below 5%.

4, a kind of manufacture method of making a kind of sulfur hexafluoride circuit breaker porcelain bottle as claimed in claim 1, specific embodiment are that batching → ball milling → blowing → sieve → pugging → moulding → drying → glazed body → fire → kiln discharge is characterized in that described:

A) in the ball milling operation, the raw material ball grinding rate is strict controlled in 250 orders/time sieve, tails over rate 0.8～1.2%;

B) in the pugging operation, vacuum degree＞0.096Mpa.