CN106595761A - Sulfur hexafluoride and nitrogen mixed gas decomposition product detection system and detection method therefor - Google Patents
Sulfur hexafluoride and nitrogen mixed gas decomposition product detection system and detection method therefor Download PDFInfo
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- CN106595761A CN106595761A CN201611128950.8A CN201611128950A CN106595761A CN 106595761 A CN106595761 A CN 106595761A CN 201611128950 A CN201611128950 A CN 201611128950A CN 106595761 A CN106595761 A CN 106595761A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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Abstract
A sulfur hexafluoride and nitrogen mixed gas decomposition product detection system is disclosed and comprises a main control unit, a display unit, a gas inlet pipeline, a gas outlet pipeline, a first detection gas passageway and a second detection gas passageway, wherein the first detection gas passageway and the second detection gas passageway are arranged in parallel; a gas inlet opening of the gas inlet pipeline is provided with a gas inlet pipe connecting head equipped with a flow control valve, gas inlet openings of the first detection gas passageway and the second detection gas passageway are connected with a gas outlet opening of the gas inlet pipeline, and gas outlet openings of the first detection gas passageway and the second detection gas passageway are connected with a gas inlet opening of the gas outlet pipeline; the first detection gas passageway is provided with decomposition product, a temperature sensing unit and a flow sensing unit; the second detection gas passageway is provided with a purity sensing unit and a pressure sensing unit. The sulfur hexafluoride and nitrogen mixed gas decomposition product detection system is aimed at detecting content of all components of decomposition product gas in mixed gas; an embedded algorithm comprising cross-removing operation, flow compensation operation, temperature compensation and the like is adopted; content of all components of the decomposition product gas in the mixed gas is obtained.
Description
Technical field
The invention belongs to high voltage electric equipment insulation technology field, more particularly to a kind of sulfur hexafluoride and nitrogen mixed gas
Catabolite detecting system and its detection method.
Background technology
China has been begun to sulfur hexafluoride (SF in 20 century 70s6) mixed gas grinding as dielectric
Study carefully, the mixed gas of consideration at that time replace high-purity SF6The main cause of gas is, SF6Gas has many weak points, such as:Price
Costliness, it is more sensitive to field uniformity, and easily liquefy under low temperature, it is not suitable for northern frore area and uses.But
The SF of same pressure in uniform field6The dielectric strength of mixed gas does not have high-purity SF6The dielectric strength of gas is high, is difficult to meet existing
Field use requirement, most High-Voltage Insulation equipment of state are still using high-purity SF still6As gas-insulated medium.
With expanding economy, international community's increasingly attaching importance to environmental protection and energy-saving and emission-reduction, in this context, SF6Gas
Greenhouse is gradually taken seriously.Pass through within 1997《The Kyoto Protocol》By SF6It is classified as one of global 6 kinds of greenhouse gases.Various countries
Scientist and power department expand substantial amounts of mixed gas research, expect with SF6/N2Mixed gas replace pure SF6Gas, makees
For the insulating gas of switchgear, to reduce SF6Usage amount, SF is reduced from source6The greenhouse effect of discharge.
From the point of view of current every research and application, SF6/N2Mixed gas have good application prospect.China enters at this stage
Capable every experimental study shows, SF6/N2The mixed gas poisonous substance not new in electric discharge is generated, and to electrode surface defect
Sensitivity it is less；From the point of view of application, using SF6/N2Arc extinguishing, dielectric of the mixed gas as chopper .ABB,
Application has been obtained in electric corporation of the foreign countries such as Siemens.
With SF6/N2Mixed gas gradually substitute SF6Pure gas as switchgear insulating gas, SF in mixed gas6Gas
The catabolite concentration analysis of body, SF6Gas purity detection, SF6Schedule has also been put in the research of the problems such as micro- water detection.
Although SF6/N2Mixed gas in physicochemical characteristicss with high-purity SF6It is similar, but calculate in catabolite gas analyses
There is very big difference in method, if still continuing to use high-purity SF6SF under gas6Catabolite testing equipment and algorithm, as a result can cause
Than larger measurement error, it is impossible to meet related GB measuring requirement.If such equipment is installed to SF6/N2Mixed gas
On high pressure equipment, the parameters measurement of the lighter's mixed gas is inaccurate, there will be severe the feelings such as equipment malfunction work, false alarm
Condition, seriously threatens SF6The safe operation of switchgear.
The content of the invention
The present invention is in order to solve weak point of the prior art, there is provided a kind of sulfur hexafluoride and nitrogen mixed gas decompose
Product detection system and its detection method, the system can realize SF6/N2The accurate measurement of mixed gas catabolite content, it is full
Monitoring, inspection demand under sufficient similar application environment, the running status of pilot switch equipment.
To solve above-mentioned technical problem, the present invention is adopted the following technical scheme that：Sulfur hexafluoride and nitrogen mixed gas decompose
Product detection system, including main control unit, display unit, air inlet pipeline, outlet pipe, the first detection gas circuit and the second detection gas
Road, the first detection gas circuit and the second detection gas circuit are arranged in parallel, and the air inlet of air inlet pipeline is provided with the air inlet with flow control valve
The air inlet of pipe joint, the first detection gas circuit and the second detection gas circuit is connected with the gas outlet of air inlet pipeline, the first detection gas circuit
It is connected with the air inlet of outlet pipe with the gas outlet of the second detection gas circuit；
Catabolite and temperature sensing unit and flow sensing unit are provided with first detection gas circuit, are set in the second detection gas circuit
Be equipped with purity sensing unit and pressure sensitive unit, main control unit by cable respectively with display unit, catabolite and temperature
The connection of sensing unit, purity sensing unit, flow sensing unit and pressure sensitive unit.
The monitoring method of sulfur hexafluoride and nitrogen mixed gas catabolite detecting system, comprises the following steps：
1）Air inlet pipe joint is connected on high-tension switch gear, it is ensured that sealing is tight；
2）Catabolite and temperature sensing unit, purity sensing unit, flow sensing unit and pressure sensitive unit are obtained respectively
Gas temperature, catabolite primary signal amount, the concentration change of mixed gas, the flow of mixed gas and gas circuit internal pressure letter
Then data are uploaded to main control unit by digital signal or analogue signal, by main control unit by this is polynary multiple by number amount
Hop algorithm calculates SF6/N2Catabolite each component content in mixed gas；
3）Shown the SF of mixed gas again by display unit in real time6Concentration, catabolite content, temperature value, and SF can be preserved6/N2
The SF of mixed gas6The parameters such as purity, catabolite content, in case carry out checking, study, together by historical query function in the future
When provide condition prompting function always according to respective standard file, remind the running status of the current high pressure equipment of user.
Step 3）The concrete calculating process of middle multiple elements design algorithm is：
Pure SF in theory6Gas and pure N2In gas, catabolite each component content adopts formula（1）Calculated,
（1）
Wherein：
, pure SF6Under background, certain density purity sensing unit response value
, SF in gaseous mixture6Volume content（v/v）%
, pure N2Under background, certain density purity sensing unit response value
, N in gaseous mixture2Volume content（v/v）%
, temperature, flow-compensated coefficient, whereinFor distinguishing different gas types, such as：SO2、H2S, CO,pFor
Temperature, flow parameter
From pure SF6Gas and pure N2The state equation of gas sets out, and has carefully analyzed the difference of real gas and ideal gases, root
According to Ge Lahanmu laws, the basic Diffusion Law of catabolite each component in mixed gas is analyzed, and by different power
Anharmonic ratio, carries out crossing operation and dynamic compensation, finally obtains calculation mixed gas catabolite each component content；
According to Ge Lahanmu laws, equality of temperature is same to depress N2Middle catabolite gas diffusion velocity is SF6Middle catabolite gas
2.28 times of bulk diffusion speed, so as to cause N under equal conditions2In catabolite sensor response quautity and SF6Middle catabolite
Sensor response quautity there is also similarity relation, but its proportionate relationship is also not quite similar for different components, through a large amount of height
Temperature experiment, difference SF6The catabolite gas experiment of lower specific components, finite concentration SF6, volume content is 30% different component
Catabolite gas experiment, and to data confluence analysiss, consider each factor, according to formula（1）Obtain arbitrary proportion
SF6/N2The multiple elements design formula of catabolite content in gaseous mixture：
（2）
Wherein：
, it is sensor raw signals penalty coefficient
, it is the response quautity of the different sensors of catabolite sensing unit
, temperature, flow-compensated coefficient
, different catabolite gases are represented, for example：SO2、H2S、CO
p, it is temperature, flow parameter.
Using above-mentioned technical proposal, calculate through substantial amounts of test and data statisticss, the present invention is explored a set of conscientiously may be used
Capable SF6The measuring method of catabolite concentration analysis in mixed gas, and SF is have developed according to the method6/N2Mixed gas point
Solution product detection system.The purpose of the present invention is to detect catabolite gas each component content in mixed gas, the system purity
SF in sensing unit detection mixed gas6Volume content, catabolite sensing unit test catabolite primary signal and ring
Border temperature, last each signal send into main control unit, and by embedding algorithm（Comprising going intersection, flow-compensated, temperature-compensating etc.）,
Obtain the content of catabolite gas each component in mixed gas.The present invention is from physics meaning angle, foundation many experiments number
According to analysis and specific multiple elements design backoff algorithm, by a certain specific SF of individual calibration6Catabolite measurement work(under concentration
Can, you can for detecting arbitrary proportion SF6With N2Catabolite content in mixed gas, is especially suitable for 3:Under 7 this ratio
SF6/N2The measurement function of mixed gas catabolite.
Description of the drawings
Fig. 1 is the structural representation of the present invention.
Specific embodiment
As shown in figure 1, the sulfur hexafluoride of the present invention and nitrogen mixed gas catabolite detecting system, including main control unit
1st, display unit 2, air inlet pipeline 3, the detection of outlet pipe 4, first gas circuit 5 and the second detection gas circuit 6, the first detection 5 He of gas circuit
Second detection gas circuit 6 is arranged in parallel, and the air inlet of air inlet pipeline 3 is provided with the air inlet pipe joint 8 with flow control valve 7, the first inspection
The air inlet for surveying gas circuit 5 and the second detection gas circuit 6 is connected with the gas outlet of air inlet pipeline 3, and the first detection gas circuit 5 and second is detected
The gas outlet of gas circuit 6 is connected with the air inlet of outlet pipe 4；
Catabolite and temperature sensing unit 9 and flow sensing unit 10, the second detection gas circuit are provided with first detection gas circuit 5
Be provided with purity sensing unit 11 and pressure sensitive unit 12 on 6, main control unit 1 by cable respectively with display unit 2, decompose
Product and temperature sensing unit 9, purity sensing unit 11, flow sensing unit 10 and pressure sensitive unit 12 connect.
The monitoring method of sulfur hexafluoride and nitrogen mixed gas catabolite detecting system, comprises the following steps：
1）Air inlet pipe joint 8 is connected on high-tension switch gear, it is ensured that sealing is tight；
2）Catabolite and 12 points of temperature sensing unit 9, purity sensing unit 11, flow sensing unit 10 and pressure sensitive unit
Huo get not be inside gas temperature, catabolite primary signal amount, the concentration change of mixed gas, the flow of mixed gas and gas circuit
Then data are uploaded to main control unit 1 by digital signal or analogue signal, are passed through by main control unit 1 by pressure signal amount
The multiple elements design algorithm calculates SF6/N2Catabolite each component content in mixed gas；
3）Shown the SF of mixed gas again by display unit 2 in real time6Concentration, catabolite content, temperature value, and SF can be preserved6/
N2The SF of mixed gas6The parameters such as purity, catabolite content, in case carry out checking, study by historical query function in the future,
Condition prompting function is provided always according to respective standard file simultaneously, the running status of the current high pressure equipment of user is reminded.
Step 3）The concrete calculating process of middle multiple elements design algorithm is：
Pure SF in theory6Gas and pure N2In gas, catabolite each component content adopts formula（1）Calculated,
（1）
Wherein：
, pure SF6Under background, certain density purity sensing unit response value
, SF in gaseous mixture6Volume content（v/v）%
, pure N2Under background, certain density purity sensing unit response value
, N in gaseous mixture2Volume content（v/v）%
, temperature, flow-compensated coefficient, whereinFor distinguishing different gas types, such as：SO2、H2S, CO,pFor
Temperature, flow parameter
From pure SF6Gas and pure N2The state equation of gas sets out, and has carefully analyzed the difference of real gas and ideal gases, root
According to Ge Lahanmu laws, the basic Diffusion Law of catabolite each component in mixed gas is analyzed, and by different power
Anharmonic ratio, carries out crossing operation and dynamic compensation, finally obtains calculation mixed gas catabolite each component content；
According to Ge Lahanmu laws, equality of temperature is same to depress N2Middle catabolite gas diffusion velocity is SF6Middle catabolite gas
2.28 times of bulk diffusion speed, so as to cause N under equal conditions2In catabolite sensor response quautity and SF6Middle catabolite
Sensor response quautity there is also similarity relation, but its proportionate relationship is also not quite similar for different components.Through a large amount of height
Temperature experiment, difference SF6The catabolite gas experiment of lower specific components, finite concentration SF6, volume content is 30% different component
Catabolite gas experiment, and to data confluence analysiss, consider each factor, according to formula（1）Obtain arbitrary proportion
SF6/N2The multiple elements design formula of catabolite content in gaseous mixture：
（2）
Wherein：
, it is sensor raw signals penalty coefficient
, it is the response quautity of the different sensors of catabolite sensing unit
, temperature, flow-compensated coefficient
, different catabolite gases are represented, for example：SO2、H2S、CO
p, it is temperature, flow parameter.
The present embodiment not makees any pro forma restriction to shape of the invention, material, structure etc., every according to this
Any simple modification, equivalent variations and modification that bright technical spirit is made to above example, belong to the technology of the present invention side
The protection domain of case.
Claims (3)
1. sulfur hexafluoride and nitrogen mixed gas catabolite detecting system, it is characterised in that：Including main control unit, show single
Unit, air inlet pipeline, outlet pipe, the first detection gas circuit and the second detection gas circuit, the first detection gas circuit and the second detection gas circuit are simultaneously
Connection is arranged, and the air inlet of air inlet pipeline is provided with the air inlet pipe joint with flow control valve, the first detection gas circuit and the second detection gas
The air inlet on road is connected with the gas outlet of air inlet pipeline, the gas outlet and outlet pipe of the first detection gas circuit and the second detection gas circuit
Air inlet connection；
Catabolite and temperature sensing unit and flow sensing unit are provided with first detection gas circuit, are set in the second detection gas circuit
Be equipped with purity sensing unit and pressure sensitive unit, main control unit by cable respectively with display unit, catabolite and temperature
The connection of sensing unit, purity sensing unit, flow sensing unit and pressure sensitive unit.
2. the monitoring method of sulfur hexafluoride according to claim 1 and nitrogen mixed gas catabolite detecting system, its
It is characterised by：Comprise the following steps：
1）Air inlet pipe joint is connected on high-tension switch gear, it is ensured that sealing is tight；
2）Catabolite and temperature sensing unit, purity sensing unit, flow sensing unit and pressure sensitive unit are obtained respectively
Gas temperature, catabolite primary signal amount, the concentration change of mixed gas, the flow of mixed gas and gas circuit internal pressure letter
Then data are uploaded to main control unit by digital signal or analogue signal, by main control unit by this is polynary multiple by number amount
Hop algorithm calculates SF6/N2Catabolite each component content in mixed gas；
3）Shown the SF of mixed gas again by display unit in real time6Concentration, catabolite content, temperature value, and SF can be preserved6/N2
The SF of mixed gas6The parameters such as purity, catabolite content, in case carry out checking, study, together by historical query function in the future
When provide condition prompting function always according to respective standard file, remind the running status of the current high pressure equipment of user.
3. sulfur hexafluoride according to claim 2 and nitrogen mixed gas catabolite detecting system and its detection method,
It is characterized in that：Step 3）The concrete calculating process of middle multiple elements design algorithm is：
Pure SF in theory6Gas and pure N2In gas, catabolite each component content adopts formula（1）Calculated,
（1）
Wherein：
, pure SF6Under background, certain density purity sensing unit response value
, SF in gaseous mixture6Volume content（v/v）%
, pure N2Under background, certain density purity sensing unit response value
, N in gaseous mixture2Volume content（v/v）%
, temperature, flow-compensated coefficient, whereinFor distinguishing different gas types, such as：SO2、H2S, CO,pFor temperature
Degree, flow parameter
From pure SF6Gas and pure N2The state equation of gas sets out, and has carefully analyzed the difference of real gas and ideal gases, root
According to Ge Lahanmu laws, the basic Diffusion Law of catabolite each component in mixed gas is analyzed, and by different power
Anharmonic ratio, carries out crossing operation and dynamic compensation, finally obtains calculation mixed gas catabolite each component content；
According to Ge Lahanmu laws, equality of temperature is same to depress N2Middle catabolite gas diffusion velocity is SF6Middle catabolite gas
2.28 times of diffusion velocity, so as to cause N under equal conditions2In catabolite sensor response quautity and SF6Middle catabolite is passed
Sensor response quautity there is also similarity relation, but its proportionate relationship is also not quite similar for different components；
Through the experiment of a large amount of high/low temperatures, difference SF6The catabolite gas experiment of lower specific components, finite concentration SF6, volume contains
The catabolite gas experiment for 30% different component is measured, and to data confluence analysiss, considers each factor, according to formula（1）
Obtain the SF of arbitrary proportion6/N2The multiple elements design formula of catabolite content in gaseous mixture：
（2）
Wherein：
, it is sensor raw signals penalty coefficient
, it is the response quautity of the different sensors of catabolite sensing unit
, temperature, flow-compensated coefficient
, different catabolite gases are represented, for example：SO2、H2S、CO
p, it is temperature, flow parameter item.
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| WO2019006815A1 (en) * | 2017-07-06 | 2019-01-10 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for quantitating solid discharge resultant of sf6 for dc wall bushing |
| CN109298293A (en) * | 2018-09-18 | 2019-02-01 | 西安理工大学 | For characterizing the gas characteristics of decomposition amount of novel electric power apparatus arc extinguishing and insulating capacity |
| CN109357699A (en) * | 2018-11-05 | 2019-02-19 | 河南省日立信股份有限公司 | A kind of multisensor array, which intersects, to be solved and its detection method |
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| CN114839235A (en) * | 2022-04-22 | 2022-08-02 | 国网黑龙江省电力有限公司电力科学研究院 | Mixed gas decomposition product measuring device based on electrochemical principle |
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| WO2019006815A1 (en) * | 2017-07-06 | 2019-01-10 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for quantitating solid discharge resultant of sf6 for dc wall bushing |
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| CN112924332A (en) * | 2021-01-27 | 2021-06-08 | 贵州电网有限责任公司 | SO in GIS equipment based on CFD technology2Diffusion characteristic determination method |
| CN112924332B (en) * | 2021-01-27 | 2023-04-28 | 贵州电网有限责任公司 | CFD technology-based SO2 diffusion characteristic determination method in GIS equipment |
| CN114839235A (en) * | 2022-04-22 | 2022-08-02 | 国网黑龙江省电力有限公司电力科学研究院 | Mixed gas decomposition product measuring device based on electrochemical principle |
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