CN105865556B - The detection method of sulfur hexafluoride gas leakage rate in a kind of GIS device - Google Patents

The detection method of sulfur hexafluoride gas leakage rate in a kind of GIS device Download PDF

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Publication number
CN105865556B
CN105865556B CN201610133151.3A CN201610133151A CN105865556B CN 105865556 B CN105865556 B CN 105865556B CN 201610133151 A CN201610133151 A CN 201610133151A CN 105865556 B CN105865556 B CN 105865556B
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China
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gas
sulfur hexafluoride
gis
hexafluoride gas
leakage
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CN105865556A (en
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林福海
涂湛
邓永强
贾蕗路
张宇
稂业员
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State Grid Corp of China SGCC
Jiangxi Electric Power Research Institute
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State Grid Corp of China SGCC
Jiangxi Electric Power Research Institute
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
    • G01F1/76Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/86Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure

Abstract

The detection method of sulfur hexafluoride gas leakage rate in a kind of GIS device, the method are to be mounted on air flow measuring apparatus close to flange or have at seal nipple, and leakage flow velocity can be transmitted back to industrial personal computer and remotely be monitored;Sulfur hexafluoride gas leakage rate is converted into according to equipment internal diameter, environment temperature, leak time by the sulfur hexafluoride gas flow velocity in measurement GIS pipeline, then by industrial personal computer special-purpose software.The device that the method is realized includes the GIS device (1) for filling sulfur hexafluoride gas, air flow measuring apparatus (2), environment temperature meter (3), sulfur hexafluoride gas pressure gauge (4), data processor (5) and industrial personal computer (6).Detection method can avoid the stoppage in transit that gas leakage causes equipment, guarantees the safe and reliable operation of equipment, while being also beneficial to carry out environmentally friendly supervision, controls the discharge of greenhouse gases.

Description

The detection method of sulfur hexafluoride gas leakage rate in a kind of GIS device
Technical field
The present invention relates to a kind of detection methods of sulfur hexafluoride gas leakage rate in GIS device, belong to substation's on-line checking Technical field.
Background technique
Increasing with Cubicle Gas-Insulated Switchgear (GIS), the dosage of sulfur hexafluoride gas is also more next It is bigger.The leakage of sulfur hexafluoride gas is as one of the common deficiency during gas insulated high voltage electric equipment operation, not only The dielectric strength that will affect equipment causes unplanned power failure, and biggish greenhouse effects, greenhouse effect will be also generated to atmospheric environment It should be 20000 times of carbon dioxide.Therefore, the work of sulfur hexafluoride gas leak detection is extremely important.
Power industry is directed in GIS substation there are the power equipment of sulfur hexafluoride gas leakage, and early stage mainly uses soap The detection methods such as water leakage detection, bandaging strapping, hand-held leak detector, in recent years using the development of sulfur hexafluoride gas infrared characteristic it is infrared at For picture leak detecting in equipment live, relatively far away from distance can find the concrete position of leakage, and precision is high, and testing result is non- Chang Zhiguan, but current detection method is all difficult to carry out accurate quantitative analysis to the sulfur hexafluoride gas of GIS device internal leakage, especially There are no detection methods for total leakage rate since the equipment installation and operation.
Summary of the invention
The object of the present invention is to for the real time leak for monitoring GIS device amount, put into operation since leakage total amount, for setting Standby state of insulation and environmental protection supervision, the present invention disclose a kind of detection method of sulfur hexafluoride gas leakage rate in GIS device.
Realize the technical scheme is that, the detection method of sulfur hexafluoride gas leakage rate in a kind of GIS device, by gas Body Flow speed measurer is mounted on close to flange or has at seal nipple, and leakage flow velocity can be transmitted back to industrial personal computer and carried out Long-range monitoring;By the sulfur hexafluoride gas flow velocity in measurement GIS pipeline, then by industrial personal computer special-purpose software according in equipment Diameter, environment temperature, leak time are converted into sulfur hexafluoride gas leakage rate.
The conversion method is as follows:
(1) flow rate calculation of GIS gas in pipelines in normal conditions, sulfur hexafluoride gas have compressibility, GIS pipe The volume flow of gas changes with the variation of pressure and temperature in road;Under standard state or free state, the quality of gas Flow are as follows: G=2826V ρ0d2
Wherein, G is mass flow (kg/h);V is the flow velocity (m/s) of gas in normal conditions;ρ0It is gas in standard Density (kg/m under state3);D is internal diameter of the pipeline (m);
(2) flow rate calculation of the gas under virtual condition, under virtual condition, the pressure and temperature of GIS gas in pipelines All change constantly, the pressure of gas is gradually reduced with the leakage of gas, manage in sulfur hexafluoride gas temperature also due to Change with ambient enviroment different transfer of heat, so taking its statistical value under normal circumstances;With sulfur hexafluoride gas in the pipe of period Average absolute pressure P and average ambient temperature t is calculated, reality total air leakage of sulfur hexafluoride gas leakage:
M=GT=2826 ρ0d2V1P×[273/(273+t)]×T
Wherein, G is mass flow (kg/h);V1The flow velocity (m/s) measured under virtual condition for gas;D is in pipeline Diameter (m);P is sulfur hexafluoride gas average absolute pressure (Bar) in GIS gas chamber;ρ0For the density of gas in normal conditions (kg/m3);T is average ambient temperature (DEG C);T is the gas leakage time (h) of statistics;Total air leakage (kg) in M- statistical time.
The method realizes sulfur hexafluoride gas by following apparatus, the inspection of sulfur hexafluoride gas leakage rate in GIS device Surveying device includes the GIS device for filling sulfur hexafluoride gas, air flow measuring apparatus, environment temperature meter, sulfur hexafluoride gas pressure Table, data processor, according to flow velocity carry out gas flow conversion industrial personal computer;The test side of air flow measuring apparatus is mounted on Close to flange or having at seal nipple in GIS pipeline, the output of air flow measuring apparatus connects data processor;Environment temperature meter Data processor is connected, sends ambient temperature information to data processor;Sulfur hexafluoride gas pressure gauge be mounted on GIS device with In the pipeline of data processor connection;The output end of data processor connects industrial personal computer.
The GIS device is to make insulation and arc-extinguishing medium, air flow measuring apparatus installation site using sulfur hexafluoride gas For close flange or have at seal nipple, and leakage flow velocity can be transmitted back to industrial personal computer and remotely be monitored.
Flow rate conversion method in the method can be used for calculating the real-time volume leakage rate of GIS device, since the operation Sulfur hexafluoride gas volumetric leak amount, the total leakage rate of quality of generation realize fine-grained management, also meet environmental requirement.
The invention has the advantages that detection method of the present invention for sulfur hexafluoride gas leakage rate in GIS device, it can To carry out real-time monitoring to the sulfur hexafluoride gas leakage rate in GIS, and the leakage total amount since putting equipment in service is calculated, The system energy and alarm simultaneously prompt operations staff to handle, and avoid gas leakage from causing the stoppage in transit of equipment, guarantee equipment Safe and reliable operation, while being also beneficial to carry out environmentally friendly supervision, control the discharge of greenhouse gases.
The present invention is suitable for being to insulate with the GIS electrical equipment of arc-extinguishing medium, it can be achieved that sulfur hexafluoride gas with sulfur hexafluoride Body real time leak amount, the monitoring for leaking total amount.
Detailed description of the invention
Fig. 1 is the apparatus structure schematic diagram that the present invention realizes;
In figure, 1 is the GIS device for filling sulfur hexafluoride gas;2 be sulfur hexafluoride gas Flow speed measurer;3 be environment temperature Meter;4 it is sulfur hexafluoride gas pressure gauge, 5 is Signal sampling and processing device;6 be industrial personal computer.
Specific embodiment
In a kind of GIS device of the present embodiment sulfur hexafluoride gas leakage rate detection method realize device as shown in Figure 1, Device includes the GIS device 1 for filling sulfur hexafluoride gas, sulfur hexafluoride gas Flow speed measurer 2, environment temperature meter 3, sulfur hexafluoride Gas gauge 4, Signal sampling and processing device 5 and industrial personal computer 6.
Sulfur hexafluoride gas Flow speed measurer 2 is being packed into the GIS device for filling sulfur hexafluoride gas at pipe flange 1, the data of measurement are passed to letter by sulfur hexafluoride gas Flow speed measurer 2, environment temperature meter 3 and sulfur hexafluoride gas pressure gauge 4 Number acquisition and processing unit 5, Signal sampling and processing device 5 output port connection industrial personal computer 6 be monitored, on industrial personal computer The special-purpose software of installation will be absolute according to equipment internal diameter, sulfur hexafluoride gas density in normal conditions, environment temperature, gas chamber The sulfur hexafluoride gas volumetric leak that pressure, leak time etc. calculate GIS device real time leak amount, occurred since the operation Amount, mass leakage.
When the detection method of sulfur hexafluoride gas leakage rate in GIS device is used on site, if the sulfur hexafluoride gas in GIS When body does not leak, then gas mobility status is not present in pipeline, then the flow speed value in pipe is zero;When there is gas leakage When, the gas pressure of air leakage point can be considered as to atmospheric pressure, sulfur hexafluoride gas goes out the flow outside pipeline in GIS pipeline internal leakage It can be calculated as follows:
1. about the flow rate calculation of GIS gas in pipelines in normal conditions
Sulfur hexafluoride gas have compressibility, the volume flow of GIS gas in pipelines with the variation of pressure and temperature and Variation.Under standard state or free state (absolute pressure of 0 DEG C of .0.1MPa), the volume flow of gas:
Q=V × 3.14 × (d/2)2× 3600 ... ... (1),
Q=2826Vd can be obtained by (1)2... ... ... (2),
(2) formula is substituted into mass flow formula: G=Q × ρ0
Obtain G=2826V ρ0d2………………(3)
2. about flow rate calculation of the gas under virtual condition
Under virtual condition, the pressure and temperature of GIS gas in pipelines all changes constantly, and the pressure of gas is with gas The leakage of body and be gradually reduced, manage in sulfur hexafluoride gas temperature also due to ambient enviroment different transfer of heat and change, so Sulfur hexafluoride gas average absolute pressure P and average ambient temperature t is calculated in pipe during taking it to count under normal circumstances.
The amendment that formula (3) are carried out to pressure and temperature can further obtain the actual mass of sulfur hexafluoride gas leakage Flow:
G=2826 ρ0d2V1P[273/(273+t)]…………………(4)
When needing to count the sulfur hexafluoride gas leakage total amount in certain time interval T,
M=GT=2826 ρ0d2V1P×[273/(273+t)]×T………………(5)
In above-mentioned formula, Q is the volume flow (m of gas in normal conditions3/h);G is mass flow (kg/h);V is The flow velocity (m/s) of gas in normal conditions;V1The flow velocity (m/s) measured under virtual condition for gas;D is internal diameter of the pipeline (m);P is sulfur hexafluoride gas average absolute pressure (Bar) in GIS gas chamber;ρ0For the density (kg/ of gas in normal conditions m3);T is average ambient temperature (DEG C);T is the gas leakage time (h) of statistics;M is total air leakage (kg) in statistical time.
It can be by the sulfur hexafluoride real time leak amount in GIS device, total leakage in statistical time according to formula (4), (5) Meter calculates, and can be reserved for numerical value.

Claims (3)

1. the detection method of sulfur hexafluoride gas leakage rate in a kind of GIS device, which is characterized in that the method is by gas stream Fast measuring instrument is mounted on close to flange or has at seal nipple, and leakage flow velocity can be transmitted back to industrial personal computer and carried out remotely Monitoring;By the sulfur hexafluoride gas flow velocity in measurement GIS pipeline, then by industrial personal computer special-purpose software according to equipment internal diameter, ring Border temperature, leak time are converted into sulfur hexafluoride gas leakage rate;
The conversion method is as follows:
(1) flow rate calculation of GIS gas in pipelines in normal conditions, sulfur hexafluoride gas has compressibility, in GIS pipeline The volume flow of gas changes with the variation of pressure and temperature;Under standard state or free state, the mass flow of gas Are as follows: G=2826V ρ0d2
Wherein, G is mass flow (kg/h);V is the flow velocity (m/s) of gas in normal conditions;ρ0In normal conditions for gas Density (kg/m3);D is internal diameter of the pipeline (m);
(2) flow rate calculation of the gas under virtual condition, under virtual condition, the pressure and temperature of GIS gas in pipelines all exists Constantly change, the pressure of gas is gradually reduced with the leakage of gas, manages interior sulfur hexafluoride gas temperature also due to week Collarette border different transfer of heat and change, so taking its statistical value under normal circumstances;It is average with sulfur hexafluoride gas in the pipe of period Absolute pressure P and average ambient temperature t is calculated, reality total air leakage of sulfur hexafluoride gas leakage:
M=GT=2826 ρ0d2V1P×[273/(273+t)]×T
Wherein, G is mass flow (kg/h);V1The flow velocity (m/s) measured under virtual condition for gas;D is internal diameter of the pipeline (m); P is sulfur hexafluoride gas average absolute pressure (Bar) in GIS gas chamber;ρ0For the density (kg/m of gas in normal conditions3);t For average ambient temperature (DEG C);T is the gas leakage time (h) of statistics;Total air leakage (kg) in M- statistical time.
2. according to claim 1 in a kind of GIS device sulfur hexafluoride gas leakage rate detection method, which is characterized in that The device that the method is realized includes the GIS device for filling sulfur hexafluoride gas, air flow measuring apparatus, environment temperature meter, hexafluoro Change sulphur gas gauge and data processor, according to the industrial personal computer of flow velocity progress gas flow conversion;Air flow measuring apparatus Test side is mounted in GIS pipeline close to flange or has at seal nipple, and the output of air flow measuring apparatus connects data processing Device;Environment temperature meter connects data processor, sends ambient temperature information to data processor;Sulfur hexafluoride gas pressure gauge peace In the pipeline that GIS device is connect with data processor;The output end of data processor connects industrial personal computer.
3. according to claim 1 in a kind of GIS device sulfur hexafluoride gas leakage rate detection method, which is characterized in that Flow rate conversion method in the method can be used for calculating the real-time volume leakage rate of GIS device, occurred since the operation six Sulfur fluoride gas volume leakage rate, the total leakage rate of quality.
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JP2020060427A (en) * 2018-10-09 2020-04-16 株式会社コスモ計器 Control device, flow rate sensitivity correction method and program
CN109253900A (en) * 2018-10-31 2019-01-22 国网重庆市电力公司电力科学研究院 A kind of sulfur hexafluoride sampling method

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CN101960303A (en) * 2008-11-11 2011-01-26 韩国电力系统开发设计有限公司 Apparatus for measuring fluid leakage from a valve using ultrasonic wave, sound, and temperature variations, and method for measuring fluid leakage using same
CN102419330A (en) * 2011-12-07 2012-04-18 重庆市电力公司电力科学研究院 Gas content detection device for hydrogen fluoride HF, and method for the same
CN104913825A (en) * 2015-06-30 2015-09-16 国家电网公司 Breaker and quality monitoring device for gas leakage

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Publication number Priority date Publication date Assignee Title
CN101960303A (en) * 2008-11-11 2011-01-26 韩国电力系统开发设计有限公司 Apparatus for measuring fluid leakage from a valve using ultrasonic wave, sound, and temperature variations, and method for measuring fluid leakage using same
CN101943691A (en) * 2010-04-14 2011-01-12 广西电网公司电力科学研究院 Device and method for checking SF6 gas leakage monitoring and alarming apparatuses
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