CN105865556A - A detection method for the quantity of sulfur hexafluoride gas leakage in a GIS - Google Patents
A detection method for the quantity of sulfur hexafluoride gas leakage in a GIS Download PDFInfo
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- CN105865556A CN105865556A CN201610133151.3A CN201610133151A CN105865556A CN 105865556 A CN105865556 A CN 105865556A CN 201610133151 A CN201610133151 A CN 201610133151A CN 105865556 A CN105865556 A CN 105865556A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
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Abstract
The invention provides a detection method for the quantity of sulfur hexafluoride gas leakage in a GIS. The method is characterized by installing a gas flow velocity measurement instrument at a position close to a flange or a position provided with a sealing connector and transmitting the leakage flow velocity back to an industrial personal computer for remote monitoring; the flow velocity of sulfur hexafluoride gas in a GIS pipeline is measured and the value is converted to the leakage quantity of sulfur hexafluoride gas by using special software of the industrial personal computer based on the internal diameter of the GIS, the environmental temperature and the leakage time. A device for implementing the method comprises a GIS (1) charged with sulfur hexafluoride gas, a gas flow velocity measurement instrument (2), an environmental temperature meter (3), a sulfur hexafluoride gas pressure meter (4), a data processor (5) and an industrial personal computer (6). The detection method can prevent stop of a GIS caused by gas leakage, guarantee the safe and reliable operation of a GIS, and facilitate environmental protection supervision and control of greenhouse gas emission.
Description
Technical field
The present invention relates to the detection method of sulfur hexafluoride gas leakage rate in a kind of GIS device, belong to transformer station and exist
Line detection technique field.
Background technology
Increasing along with Cubicle Gas-Insulated Switchgear (GIS), the consumption of sulfur hexafluoride gas
The most increasing.Normal as during gas insulated high voltage electric equipment operation of the leakage of sulfur hexafluoride gas
See one of defect, not only can affect the dielectric strength of equipment, cause unplanned power failure, also will be to atmospheric environment
Producing bigger greenhouse effect, its greenhouse effect is 20000 times of carbon dioxide.Therefore, sulfur hexafluoride gas
The work of body Leak Detection is extremely important.
Power industry is for there is the power equipment that sulfur hexafluoride gas leaks in GIS transformer station, main
Use the detection methods such as soap water leakage detection, bandaging strapping, hand-held leak detector, utilize sulfur hexafluoride gas red in recent years
The infrared imaging leak detecting of external characteristics development is in the case of equipment live, and relatively far away from distance just can find leakage
Concrete position, precision is high, and testing result is very directly perceived, but current detection method is all difficult to set GIS
The sulfur hexafluoride gas of standby internal leakage has carried out accurate quantitative analysis, the particularly total leakage since equipment installation and operation
Amount does not also have detection method.
Summary of the invention
It is an object of the invention to, in order to monitor GIS device real time leak amount, put into operation since leakage total amount,
Supervise for apparatus insulated state and environmental protection, sulfur hexafluoride gas leakage in the open a kind of GIS device of the present invention
The detection method of amount.
Realization the technical scheme is that, the detection side of sulfur hexafluoride gas leakage rate in a kind of GIS device
Method, is mounted on air flow measuring apparatus near flange or has at seal nipple, it is possible to will leak out stream
Speed is transmitted back to industrial computer and remotely monitors；By measuring the sulfur hexafluoride gas flow velocity in GIS pipeline, then
It is converted into sulfur hexafluoride gas according to equipment internal diameter, ambient temperature, leak time by industrial computer special-purpose software
Leakage rate.
Described conversion method is as follows:
(1) GIS gas in pipelines flow rate calculation in normal conditions, sulfur hexafluoride gas has compressible
Property, the volume flow of GIS gas in pipelines changes with the change of pressure and temperature；In standard state or freedom
Under state, the volume flow of gas is: G=2826V ρ0d2；
Wherein, G is mass flow (kg/h)；V is gas flow velocity (m/s) in normal conditions；ρ0For
Gas density (kg/m in normal conditions3)；D is internal diameter of the pipeline (m)；
(2) gas flow rate calculation under virtual condition, under virtual condition, the pressure of GIS gas in pipelines
Power and temperature all change constantly, and the pressure of gas is gradually reduced along with the leakage of gas, hexafluoro in pipe
Change sulfur gas temperature also due to surrounding different transfer of heat and change, so take in the ordinary course of things its statistics
Value；Calculate by sulfur hexafluoride gas average absolute pressure P and average ambient temperature t in the pipe of period, six
The actual mass flow of sulfur fluoride 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 (MPa) in GIS air chamber；ρ0For gas
Body density (kg/m in normal conditions3)；T is average ambient temperature (DEG C)；T is the gas leakage time of statistics
(h)；Total air leakage (kg) in M-timing statistics.
Described method realizes sulfur hexafluoride gas by following apparatus, sulfur hexafluoride gas leakage rate in GIS device
Detection device include filling the GIS device of sulfur hexafluoride gas, air flow measuring apparatus, ambient temperature meter,
Sulfur hexafluoride gas Pressure gauge, data processor, carry out the industrial computer of gas flow conversion according to flow velocity；Gas
The test side of rate of flow of fluid measuring instrument is arranged in GIS pipeline near flange or has at seal nipple, gas flow rate
The output of measuring instrument connects data processor；Ambient temperature meter connects data processor, sends out to data processor
Send ambient temperature information；Sulfur hexafluoride gas Pressure gauge is arranged on the pipe that GIS device is connected with data processor
In road；The outfan of data processor connects industrial computer.
Described GIS device, is to use sulfur hexafluoride gas to insulate and arc-extinguishing medium, air flow measuring apparatus
Installation site is near flange or have at seal nipple, it is possible to will leak out flow velocity and is transmitted back to industrial computer and carries out far
Range monitoring.
Flow rate conversion method in described method can be used for calculating the real-time volume leakage rate of GIS device, from fortune
The sulfur hexafluoride gas volumetric leak amount of generation, the total leakage rate of quality since row, it is achieved fine-grained management, also
Meet environmental requirement.
The invention has the beneficial effects as follows, the present invention is the detection of sulfur hexafluoride gas leakage rate in GIS device
Method, can monitor in real time to the sulfur hexafluoride gas leakage rate in GIS, and to putting equipment in service since
Leakage total amount calculate, this system energy and alarm also point out operations staff to process, it is to avoid gas
Leakage causes the stoppage in transit of equipment, it is ensured that the safe and reliable operation of equipment, is simultaneously also beneficial to carry out environmental protection supervision,
Control the discharge of greenhouse gases.
The present invention is applicable to, with sulfur hexafluoride for insulation and the GIS electrical equipment of arc-extinguishing medium, to realize hexafluoro
Change sulfur gas real time leak amount, the monitoring of leakage total amount.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram that the present invention realizes；
In figure, 1 is the GIS device filling sulfur hexafluoride gas；2 is sulfur hexafluoride gas Flow speed measurer；3
It it is ambient temperature meter；4 it is sulfur hexafluoride gas Pressure gauge, 5 is Signal sampling and processing device；6 is industry control
Machine.
Detailed description of the invention
Device such as Fig. 1 that in a kind of GIS device of the present embodiment, the detection method of sulfur hexafluoride gas leakage rate realizes
Shown in, device includes filling the GIS device 1 of sulfur hexafluoride gas, sulfur hexafluoride gas Flow speed measurer 2, ring
Border thermometer 3, sulfur hexafluoride gas Pressure gauge 4, Signal sampling and processing device 5 and industrial computer 6.
Sulfur hexafluoride gas Flow speed measurer 2 is being loaded the GIS filling sulfur hexafluoride gas at pipe flange
Equipment 1, sulfur hexafluoride gas Flow speed measurer 2, ambient temperature meter 3 and sulfur hexafluoride gas Pressure gauge 4 will
The data input signal measured gathers and processing means 5, and the output port of Signal sampling and processing device 5 connects
Industrial computer 6 is monitored, and the special-purpose software installed on industrial computer will be according to equipment internal diameter, sulfur hexafluoride gas
Body density in normal conditions, ambient temperature, air chamber absolute pressure, leak time etc. calculate GIS and set
Standby real time leak amount, the sulfur hexafluoride gas volumetric leak amount occurred since running, mass leakage.
When in GIS device, the detection method of sulfur hexafluoride gas leakage rate is for scene, if six in GIS
When sulfur fluoride gas does not leak, then in pipeline, there is not gas mobility status, be then contained in the flow velocity in pipe
Value is zero；When there being gas to leak, the gas pressure of air leakage point can be considered as atmospheric pressure, sulfur hexafluoride gas
Body goes out the flow outside pipeline in GIS pipeline internal leakage and can calculate as follows:
1. about GIS gas in pipelines flow rate calculation in normal conditions
Sulfur hexafluoride gas has compressibility, and the volume flow of GIS gas in pipelines is with the change of pressure and temperature
Change and change.(absolute pressure of 0 DEG C of .0.1MPa), the volume flow of gas under standard state or free state
Amount:
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 gas flow rate calculation under virtual condition
Under virtual condition, the pressure and temperature of GIS gas in pipelines all changes constantly, the pressure of gas
Being gradually reduced along with the leakage of gas, sulfur hexafluoride gas temperature in pipe is also due to pass with the surrounding temperature difference
Heat and change, so take in the ordinary course of things its statistics during pipe in sulfur hexafluoride gas average absolute pressure P
Calculate with average ambient temperature t.
Formula (3) is carried out the correction of pressure and temperature, the reality of sulfur hexafluoride gas leakage can be obtained further
Border mass flow:
G=2826 ρ0d2V1P[273/(273+t)]…………………(4)
When the sulfur hexafluoride gas leakage total amount needing statistics in certain time interval T,
M=GT=2826 ρ0d2V1P×[273/(273+t)]×T………………(5)
In above-mentioned formula, Q is gas volume flow (m in normal conditions3/h)；G is mass flow
(kg/h)；V is gas flow velocity (m/s) in normal conditions；V1Measure under virtual condition for gas
Flow velocity (m/s)；D is internal diameter of the pipeline (m)；P is sulfur hexafluoride gas average absolute pressure (MPa) in GIS air chamber；
ρ0For gas density (kg/m in normal conditions3)；T is average ambient temperature (DEG C)；T is the leakage of statistics
Gas time (h)；M is the total air leakage (kg) in timing statistics.
Just can be by the sulfur hexafluoride real time leak amount in GIS device, timing statistics according to formula (4), (5)
Total leaking rate formulas out, and numerical value can be preserved.
Claims (4)
1. the detection method of sulfur hexafluoride gas leakage rate in a GIS device, it is characterised in that described
Method is to be mounted on by air flow measuring apparatus near flange or have at seal nipple, it is possible to will leak out
Flow velocity is transmitted back to industrial computer and remotely monitors；By measuring the sulfur hexafluoride gas flow velocity in GIS pipeline,
It is converted into sulfur hexafluoride gas according to equipment internal diameter, ambient temperature, leak time again by industrial computer special-purpose software
Body leakage rate.
The detection method of sulfur hexafluoride gas leakage rate in a kind of GIS device,
It is characterized in that, described conversion method is as follows:
(1) GIS gas in pipelines flow rate calculation in normal conditions, sulfur hexafluoride gas has compressible
Property, the volume flow of GIS gas in pipelines changes with the change of pressure and temperature；Standard state or from
By under state, the volume flow of gas is: G=2826V ρ0d2；
Wherein, G is mass flow (kg/h)；V is gas flow velocity (m/s) in normal conditions；ρ0For
Gas density (kg/m in normal conditions3)；D is internal diameter of the pipeline (m)；
(2) gas flow rate calculation under virtual condition, under virtual condition, the pressure of GIS gas in pipelines
Power and temperature all change constantly, and the pressure of gas is gradually reduced along with the leakage of gas, hexafluoro in pipe
Change sulfur gas temperature also due to surrounding different transfer of heat and change, so take in the ordinary course of things its statistics
Value；Calculate by sulfur hexafluoride gas average absolute pressure P and average ambient temperature t in the pipe of period, six
The actual mass flow of sulfur fluoride 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 (MPa) in GIS air chamber；ρ0For
Gas density (kg/m in normal conditions3)；T is average ambient temperature (DEG C)；T is the gas leakage of statistics
Time (h)；Total air leakage (kg) in M-timing statistics.
The detection method of sulfur hexafluoride gas leakage rate in a kind of GIS device,
It is characterized in that, the device that described method realizes includes filling the GIS device of sulfur hexafluoride gas, gas flow rate
Measuring instrument, ambient temperature meter, sulfur hexafluoride gas Pressure gauge and data processor, carry out gas according to flow velocity
The industrial computer of flow rate conversion；The test side of air flow measuring apparatus is arranged in GIS pipeline near flange or has
At seal nipple, the output of air flow measuring apparatus connects data processor；Ambient temperature meter connects at data
Reason device, sends ambient temperature information to data processor；Sulfur hexafluoride gas Pressure gauge is arranged on GIS device
In the pipeline being connected with data processor；The outfan of data processor connects industrial computer.
The detection method of sulfur hexafluoride gas leakage rate in a kind of GIS device,
It is characterized in that, the flow rate conversion method in described method can be used for calculating the real-time volume leakage of GIS device
Amount, the sulfur hexafluoride gas volumetric leak amount occurred since running, the total leakage rate of quality, it is achieved become more meticulous
Management, also meets environmental requirement.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111024334A (en) * | 2018-10-09 | 2020-04-17 | 株式会社科思莫计器 | Control device, flow sensitivity correction method, and storage medium |
| CN112903211A (en) * | 2021-03-29 | 2021-06-04 | 广州燃气集团有限公司 | Equipment and method for detecting tightness of gas pipeline |
| CN113125300A (en) * | 2021-04-12 | 2021-07-16 | 国网河北省电力有限公司衡水供电分公司 | Sulfur hexafluoride density quality transmission device and system with wireless transmission and transmitter |
| CN114323459A (en) * | 2021-11-22 | 2022-04-12 | 华能海南发电股份有限公司海口电厂 | Front end detecting unit device |
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| CN111024334A (en) * | 2018-10-09 | 2020-04-17 | 株式会社科思莫计器 | Control device, flow sensitivity correction method, and storage medium |
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| CN114323459A (en) * | 2021-11-22 | 2022-04-12 | 华能海南发电股份有限公司海口电厂 | Front end detecting unit device |
| CN114323459B (en) * | 2021-11-22 | 2024-04-26 | 华能海南发电股份有限公司海口电厂 | Front end detection unit device |
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