CN104966647A - Mixed gas filling method of porcelain knob type breaker - Google Patents
Mixed gas filling method of porcelain knob type breaker Download PDFInfo
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- CN104966647A CN104966647A CN201510310556.5A CN201510310556A CN104966647A CN 104966647 A CN104966647 A CN 104966647A CN 201510310556 A CN201510310556 A CN 201510310556A CN 104966647 A CN104966647 A CN 104966647A
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- Prior art keywords
- gas
- circuit breaker
- breaker
- mist
- filling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
Abstract
The invention discloses a mixed gas filling method of a porcelain knob type breaker. Aiming at the technical state in the prior art that extreme microthermal climate in winter causes a low-temperature liquefaction alarm of a breaker and occurrence of a locking failure, thereby seriously threatening safe and stable operation of equipment, according to pressure difference calculation under the same temperature, the method determines each gas content according to the Dalton's law of partial pressure, accurately calculates the content of mixed gas of the porcelain knob type breaker, compares the content with SF6 and CF4 gas volume percentage concentration provided by an equipment manufacturer after filling, and determines whether the content of the mixed gas is qualified till the content meets the standard. The method provided by the invention accurately calculates the content of mixed gas of the porcelain knob type breaker, solves the problem of the content of SF6 and CF4 gases in filling of mixed gas of a porcelain knob type breaker newly put into operation and a gas complementing process of a mixed gas-filling breaker in routine maintenance, guarantees engineering availability, provides a powerful guarantee for safe and stable operation of power grid equipment, and has extensive practical significance.
Description
Technical field
The invention belongs to transmission facility technical field more specifically, more specifically, the present invention relates to a kind of porcelain knob breaker mist methods for filling.
Background technology
SF
6gas, i.e. sulphur hexafluoride T&B, it is the artificial inert gas that France two chemist Moissan and Lebeau synthesized in 1900, and before and after 1940, US military uses it for Manhattan project (core is military).Nineteen forty-seven, provider used.Current SF
6gas is mainly used in power industry.SF
6gas is used for the electric equipment of 4 types as insulation and/or arc extinguishing; SF
6circuit breaker and GIS (refer to sulfur hexafluoride sealed combination electrical equipment here, are called " gas-insulated switchgear " (Gas InsulatedSwitchgear), SF in the world
6load switch equipment, SF
6insulated power pipeline, SF
6transformer and SF
6insulated substations.80% for high pressure power equipment.SF
6gas has good chemical stability and thermal stability, remarkable electrical insulating property and arc extinction performance, and it replaces insulating oil and compressed air completely and becomes unique breaker arc extinguishing medium.
Chemical formula CF
4, tetrafluoromethane (Carbon Tetrafluoride or Tetrafluoromethane), also known as carbon tetrafluoride, perfluocarbon, PFC-14 (R-14), trade name Reflube 14, relative molecular weight 88.00.At normal temperatures, tetrafluoromethane is colourless, odorless, does not fire, water-fast compressibility gas.Boiling point-128 DEG C, fusing point-183.6 DEG C.Fluid density (-130 DEG C) 1.613g/cm
3, critical temperature-45.67 DEG C, critical pressure 3.74MPa, vapour pressure (-150.7 DEG C) 13.33kPa, dielectric constant (25 DEG C, 0.5MPa) 1.0006.Volatility is higher, it is one of the most stable organic compound, 900 degrees Celsius time, do not react with steel, nickel, tungsten, molybdenum, only slowly decompose at carbon arc temperature, be slightly soluble in water, under 25 degrees Celsius and 0.1MPa, its solubility is 0.0015% (weight ratio), but when burning with imflammable gas, can decompose and produce poisonous fluoride, dangerous classification is the 2.2nd class non-flammable compressive gas.
Current outdoor SF
6arc-extinguishing chamber of circuit breaker gas pressure is generally 0.6MPa (relative pressure), then the condensing temperature of its correspondence is about-25 DEG C.When circuit breaker institute installation site is positioned at severe cold areas, easily there is liquefaction phenomenon in winter low temperature, causes circuit breaker to cut-off capacity and sharply reduce, and very easily occurs that breaker arc extinguishing is unsuccessful even to explode in grid switching operation, expansion accident scope, needs to prevent SF in therefore running
6low temperature hydraulic pressure phenomenon.Overhauling company of current Guo Wang Xinjiang power company is responsible for highest voltage level 750kV electrical network in O&M boundary, builds so far and puts into operation 11, distribution south and north Sinkiang.Due to Xinjiang special geological surrounding, easily there is extreme low temperature weather in winter.In 750kV transformer station, occurred a lot of circuit breaker low-temperature liquefaction report to the police, locking fault, as 750kV Wu Bei turns black permanent line, crowization one line with regard to priority there is SF
6gas liquefaction problem.In follow-up new, reconstruction and extension project, circuit breaker low-temperature liquefaction is focal point always, and the stable operation of serious threat device security.In actual motion, once circuit breaker occurs liquefaction because of low temperature, do not have reliable expedient and solve this type of phenomenon, just can thoroughly can only solve after equipment is stopped transport.
The method of current solution circuit breaker low-temperature liquefaction has three kinds, and one adopts hypobaric SF when being product design
6gas is normal inflation.Under the same conditions, SF is reduced
6gas pressure, can make circuit breaker work at lower temperatures, and its cost reduces breaking capacity of breaker, and therefore this type of mode is not suitable for and need tolerates low temperature, high specified drop-out current area.Two is take mixed gas as SF in circuit breaker air chamber
6+ N
2or SF
6+ CF
4as working media, both reduced gas liquefaction temperature, significantly do not reduced breaking capacity of breaker again.Three is adopt SF in air chamber
6gas-heated mode, makes SF in operating condition in the winter time
6gas departs from liquefaction point.Because of porcelain knob breaker design feature, take mode of heating and the indoor dielectric of not bery desirable heat air, practical application effect is poor.The above three kinds of modes of contrast, it is the most feasible that employing fills mist, because of CF
4gas is also strong electronegativity gas, according to practical engineering application effect, considers economy problems etc., adopts SF
6+ CF
4mode is the most effective.But application fills SF
6/ CF
4during gas, with pure SF
6gas filling mode has a great difference, needs to verify SF after inflation
6with CF
4concentration ratio relation, guarantees not because pouring SF more
6gas Shaochong enters CF
4gas, does not have substantive reduction liquefaction point temperature; Again can not because pouring CF more
4gas Shaochong enters SF
6gas and significantly reduce breaking capacity of breaker.The SF filled
6/ CF
4mist has the proportionate relationship determined, and safeguards in strict accordance with proportionate relationship.Consider and pure SF
6gas filling mode is different, is filling SF to circuit breaker
6/ CF
4during mist, how to determine mist partial pressure to ensure to determine strict proportionate relationship.And unify effective methods for filling at present, the anti-low-temperature liquefaction of circuit breaker, the reliable and stable operation of equipment is not just known where to begin yet.
Summary of the invention
For the Xinjiang existed in prior art because extreme low temperature weather in winter makes circuit breaker low-temperature liquefaction report to the police and occur locking fault, the stable operation of serious threat device security; And fill mixed gas SF in the circuit breaker air chamber used now
6+ N
2or SF
6+ CF
4the problem of ununified effective methods for filling.The present invention is intended to propose a kind of porcelain knob breaker mist methods for filling, its method calculates according to the identical temperature downforce difference in front and back, each gas content is determined according to Dalton's law (of partial pressures), accurately calculate porcelain knob breaker mixed gas content, after carrying out filling and equipment manufacturing SF is provided
6with CF
4gas volume percentage concentration compares, and determines that whether mixed gas content is qualified, until meet standard.The method provides powerful guarantee for grid equipment safe and stable operation.
The present invention is achieved through the following technical solutions:
A kind of porcelain knob breaker mist methods for filling, according to the difference of its operational phase, can be divided into following two benches, namely newly put into operation stage circuit breaker inflation and (regular maintenance stage) circuit breaker inflation that puts into operation the stage, and gas filling method comprises the steps:
When circuit breaker newly comes into operation inflation:
(1) the circuit breaker defined pressure value P of circuit breaker current environmental temperature T and correspondence thereof is checked
n.
(2) whether the inflation regime that judgment device manufactory provides meets Dalton's law (of partial pressures), as met, first fills SF
6cF is filled after gas
4gas is until required rated pressure value.
(3), after mist tonifying Qi, the result of implementation according to (2) tests SF again
6with CF
4gas volume percent concentration, provides SF with equipment manufacturing
6with CF
4gas volume percentage concentration compares, and determines whether mixed gas content meets the requirements; If do not meet, then circuit breaker is considered as the stage circuit breaker inflation that puts into operation, inflates, until meet standard according to the aeration step of the stage circuit breaker that puts into operation.
When inflating again after the circuit breaker that newly puts into operation uses, be namely considered as the stage circuit breaker that put into operation, when the stage circuit breaker that put into operation is inflated:
(4) the circuit breaker defined pressure value P of circuit breaker current environmental temperature T and correspondence thereof is accurately calculated
n; SF in test both opens device
6with CF
4gas volume percent concentration, namely uses SF
6gas volume percent concentration measuring instrument measures SF
6concentration, determines K according to this concentration
2%;
(5) from porcelain knob breaker producer data, required make-up gas concentration of volume percent K is accurately obtained
1%, by formula 1. with 2. calculate each gas pressure, determine each gas content according to Dalton's law (of partial pressures), carry out tonifying Qi until rated pressure value according to institute's evaluation;
SF
6gas pressure A=P
m× K
1%-P
n× K
2% 1.
CF
4gas pressure B=P
m× (1-K
1%)-P
n× (1-K
2%) 2.
(6), after mist tonifying Qi, the result of implementation according to (5) tests SF again
6with CF
4gas volume percent concentration, provides SF with equipment manufacturing
6with CF
4gas volume percentage concentration compares, and determines whether mixed gas content meets the requirements; If do not meet, repeat said process, until meet standard.
The beneficial effect that the present invention reaches:
A kind of porcelain knob breaker mist methods for filling of the present invention, calculate according to the identical temperature downforce difference in front and back, determine each gas content according to Dalton's law (of partial pressures), inflate after accurately calculating porcelain knob breaker mixed gas content, after inflation, again test SF
6with CF
4gas volume percent concentration, provides SF with equipment manufacturing
6with CF
4will comparing of gas volume percentage concentration, determine that whether mixed gas content is qualified, until meet standard.Solving Xinjiang because of extreme low temperature weather in winter makes circuit breaker low-temperature liquefaction cisco unity malfunction, the problem of serious threat device security stable operation, solves further in the inflation of the porcelain knob breaker mist that newly puts into operation and regular maintenance and fills SF in the make-up gas process of mist circuit breaker
6and CF
4gas content and proportionate relationship problem, the porcelain knob breaker that the method can be produced for different manufacturers carries out filling and guarantees engineering availability, for grid equipment safety, stable operation provide powerful guarantee.
Accompanying drawing explanation
Fig. 1 is SF in the present invention
6/ CF
4mixture pressure and temperature curve relation schematic diagram.In figure, a is SF
6/ CF
4mist rated pressure bunch, b is SF
6/ CF
4mist alarm pressure bunch, c is SF
6/ CF
4mist locking pressure bunch, e is SF
6/ CF
4mist liquefaction pressure bunch.
Fig. 2 is SF in the present invention
6/ CF
4mixture pressure and temperature curve relation schematic diagram.
Embodiment
1-2 and embodiment with reference to the accompanying drawings, the invention will be further described:
Embodiment one:
A kind of porcelain knob breaker mist methods for filling, according to the difference of its operational phase, can be divided into following two benches, namely newly put into operation stage circuit breaker inflation and (regular maintenance stage) circuit breaker inflation that puts into operation the stage, and gas filling method comprises the steps:
When circuit breaker newly comes into operation inflation:
(1) the circuit breaker defined pressure value P of circuit breaker current environmental temperature T and correspondence thereof is checked
n.
(2) whether the inflation regime that judgment device manufactory provides meets Dalton's law (of partial pressures), as met, first fills SF
6cF is filled after gas
4gas is until required rated pressure value.
(3), after mist tonifying Qi, the result of implementation according to (2) tests SF again
6with CF
4gas volume percent concentration, provides SF with equipment manufacturing
6with CF
4gas volume percentage concentration compares, and determines whether mixed gas content meets the requirements; If do not meet, then circuit breaker is considered as the stage circuit breaker inflation that puts into operation, inflates, until meet standard according to the aeration step of the stage circuit breaker that puts into operation.
When inflating again after the circuit breaker that newly puts into operation uses, be namely considered as the stage circuit breaker that put into operation, when the stage circuit breaker that put into operation is inflated:
(4) the circuit breaker defined pressure value P of circuit breaker current environmental temperature T and correspondence thereof is accurately calculated
n; SF in test both opens device
6with CF
4gas volume percent concentration, namely uses SF
6gas volume percent concentration measuring instrument measures SF6 concentration, determines K according to this concentration and table 1
2%;
(5) from porcelain knob breaker producer data, required make-up gas concentration of volume percent K is accurately obtained
1%, by formula 1. with 2. calculate each gas pressure, determine each gas content according to Dalton's law (of partial pressures), carry out tonifying Qi until rated pressure value according to institute's evaluation;
SF
6gas pressure A=P
m× K
1%-P
n× K
2% 1.
CF
4gas pressure B=P
m× (1-K
1%)-P
n× (1-K
2%) 2.
(6), after mist tonifying Qi, the result of implementation according to (5) tests SF again
6with CF
4gas volume percent concentration, provides SF with equipment manufacturing
6with CF
4gas volume percentage concentration compares, and determines whether mixed gas content meets the requirements.If do not meet, repeat said process, until meet standard.
Embodiment two:
With reference to accompanying drawing 1 or accompanying drawing 2, first set up SF
6/ CF
4mixture pressure and temperature foh curve, according to gas state equation, determine that wherein three known quantities can obtain the 4th unknown quantity, that is have between each parameter and determine mathematical relationship.Therefore, in practical engineering application, when arc-extinguishing chamber of circuit breaker chamber volume is constant, clearly current environmental temperature T need be obtained, according to SF
6/ CF
4mixture pressure and temperature curve relation just can obtain gas pressure intensity P accurately, the SF provided according to equipment manufacturing
6/ CF
4concentration ratio relation, carries out tonifying Qi.
Embodiment three:
See table 1, if the SF in mist
6/ CF
4percent by volume is 0.0%, then only have pure CF
4be introduced in circuit breaker air chamber, instrument display 49.6.Therefore as use SF
6during gas volume percent concentration measuring instrument, need at SF
6/ CF
4mist clearance SF
6gas impossible measure real concentration of volume percent with percent by volume measuring instrument, the SF in fact shown by instrument
6gas is fewer than necessary being, just can obtain correct percent concentration numerical value after therefore measuring with the instrument show value table of comparisons 1.
| Show value | SF 6-Vol.-％ * | Show value | SF 6-Vol.-％ * |
| 49.6 | 0.0 | 75.0 | 50.4 |
| 50.0 | 0.8 | 76.0 | 52.4 |
| 51.0 | 2.8 | 77.0 | 54.4 |
| 52.0 | 4.8 | 78.0 | 56.3 |
| 53.0 | 6.7 | 79.0 | 58.3 |
| 54.0 | 8.7 | 80.0 | 60.3 |
| 55.0 | 10.7 | 81.0 | 62.3 |
| 56.0 | 12.7 | 82.0 | 64.3 |
| 57.0 | 14.7 | 83.0 | 66.3 |
| 58.0 | 16.7 | 84.0 | 68.3 |
| 59.0 | 18.7 | 85.0 | 70.2 |
| 60.0 | 20.6 | 86.0 | 72.2 |
| 61.0 | 22.6 | 87.0 | 74.2 |
| 62.0 | 24.6 | 88.0 | 76.2 |
| 63.0 | 26.6 | 89.0 | 78.2 |
| 64.0 | 28.6 | 90.0 | 80.2 |
| 65.0 | 30.6 | 91.0 | 82.1 |
| 66.0 | 32.6 | 92.0 | 84.1 |
| 67.0 | 34.5 | 93.0 | 86.1 |
| 68.0 | 36.5 | 94.0 | 88.1 |
| 69.0 | 38.5 | 95.0 | 90.1 |
| 70.0 | 40.5 | 96.0 | 92.1 |
| 71.0 | 42.5 | 97.0 | 94.0 |
| 72.0 | 44.4 | 98.0 | 96.0 |
| 73.0 | 46.4 | 99.0 | 98.0 |
| 74.0 | 48.4 | 100.0 | 100.0 |
Table 1: measure SF
6/ CF
4the corresponding conversion table of mist instrument show value
Embodiment four:
SF
6/ CF
4p in supplementary pressure formula needed for each gas
mnormal inflation value when being 20 DEG C, P
nfor current environment T presses down force value, according to SF
6/ CF
4mixture pressure and temperature curve read pressure monitoring numerical value, K
1% is the SF determined
6with CF
4require percentage, K
2% is for using SF
6the concentrations control table 1 of gas volume percent concentration measuring instrument display draws numerical value.Be such as 20 degrees Celsius for current environmental temperature, circuit breaker fills rated pressure P after mist
mfor 0.75MPa, SF
6with CF
4requirement percentage is 51:49, P under current environment
nfor 0.55MPa, measure SF
6/ CF
4during mist, instrument show value is 80, determines SF according to table 1
6gas concentration K
2be 60.3.
Need supplementary SF
6gas: 0.75*51%-0.55*60.3%=0.05MPa.
Need supplementary CF
4gas: 0.75*49%-0.55*39.7%=0.15MPa.
After make-up gas, according to again testing SF
6with CF
4gas volume percent concentration, and provide SF with equipment manufacturing
6with CF
4gas volume percentage concentration compares, and repeated charging process is till meeting manufacturer's standards.Porcelain knob breaker mist methods for filling can be realized by the above, guarantee engineering availability, for grid equipment safe and stable operation provides powerful guarantee.
As mentioned above; the present invention can be realized preferably; the above embodiments are only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection range that the present invention determines.
Claims (4)
1. a porcelain knob breaker mist methods for filling, the difference that porcelain knob breaker mist fills according to operational phase can be divided into newly put into operation stage circuit breaker inflation and the stage circuit breaker inflation two benches that put into operation, it is characterized in that, gas filling method comprises the steps:
When circuit breaker newly comes into operation inflation:
(1) the circuit breaker defined pressure value P of circuit breaker current environmental temperature T and correspondence thereof is checked
n;
(2) whether the inflation regime that judgment device manufactory provides meets Dalton's law (of partial pressures), as met, first fills SF
6cF is filled after gas
4gas is until required rated pressure value;
(3), after mist tonifying Qi, the result of implementation according to above-mentioned steps (2) tests SF again
6with CF
4gas volume percent concentration, provides SF with equipment manufacturing
6with CF
4gas volume percentage concentration compares, and determines whether mixed gas content meets the requirements; If do not meet, then circuit breaker is considered as the stage circuit breaker inflation that puts into operation, inflates, until meet standard according to the aeration step of the stage circuit breaker that puts into operation;
When inflating again after the circuit breaker that newly puts into operation uses, be namely considered as the stage circuit breaker that put into operation, when the stage circuit breaker that put into operation is inflated:
(4) the circuit breaker defined pressure value P of circuit breaker current environmental temperature T and correspondence thereof is accurately calculated
n; SF in test both opens device
6with CF
4gas volume percent concentration, namely uses SF
6gas volume percent concentration measuring instrument measures SF6 concentration and determines K
2%;
(5) from porcelain knob breaker producer data, required make-up gas concentration of volume percent K is accurately obtained
1%, by formula 1. with 2. calculate each gas pressure, determine each gas content according to Dalton's law (of partial pressures), carry out tonifying Qi until rated pressure value according to institute's evaluation;
SF
6gas pressure A=P
m× K
1%-P
n× K
2% 1.,
CF
4gas pressure B=P
m× (1-K
1%)-P
n× (1-K
2%) 2.;
(6), after mist tonifying Qi, the result of implementation according to above-mentioned steps (5) tests SF again
6with CF
4gas volume percent concentration, provides SF with equipment manufacturing
6with CF
4gas volume percentage concentration compares, and determines whether mixed gas content meets the requirements; If do not meet, repeat said process, until meet standard.
2. porcelain knob breaker mist methods for filling as claimed in claim 1, it is characterized in that, described current environmental temperature T checks circuit breaker defined force value corresponding to current environmental temperature T.
3. porcelain knob breaker mist methods for filling as claimed in claim 1, it is characterized in that, the described regular maintenance stage fills in mist circuit breaker make-up gas, determines to answer make-up gas force value, SF in test both opens device according to claim 2
6with CF
4gas volume percent concentration, carries out tonifying Qi.
4. porcelain knob breaker mist methods for filling as claimed in claim 1, it is characterized in that, described stage of newly putting into operation circuit breaker fills in mist, whether meeting Dalton's law (of partial pressures), as met, first filling SF according to the inflation regime that equipment manufacturing provides
6cF is filled after gas
4gas is until rated pressure value.
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|---|---|---|---|
| CN201510310556.5A CN104966647B (en) | 2015-06-08 | 2015-06-08 | A kind of porcelain knob breaker mixed gas methods for filling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510310556.5A CN104966647B (en) | 2015-06-08 | 2015-06-08 | A kind of porcelain knob breaker mixed gas methods for filling |
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| Publication Number | Publication Date |
|---|---|
| CN104966647A true CN104966647A (en) | 2015-10-07 |
| CN104966647B CN104966647B (en) | 2017-08-11 |
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ID=54220672
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109711078A (en) * | 2018-12-29 | 2019-05-03 | 云南电网有限责任公司电力科学研究院 | A kind of breaker contact system in short-term in tolerance course thermal stability calculation method |
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2015
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|---|---|
| CN104966647B (en) | 2017-08-11 |
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