CN110806292A - Quantitative test method and system for quality leakage rate of sulfur hexafluoride electrical equipment - Google Patents
Quantitative test method and system for quality leakage rate of sulfur hexafluoride electrical equipment Download PDFInfo
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
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Abstract
The application discloses a quantitative test method and a system for the quality leakage rate of sulfur hexafluoride electrical equipment, wherein the method comprises the following steps: measuring the volume of sulfur hexafluoride gas leaked from a leakage point of sulfur hexafluoride electrical equipment within a certain period of time; calculating the absolute air leakage rate of a leakage point of sulfur hexafluoride electrical equipment, and measuring and recording the temperature and the pressure on site; and calculating the mass leakage rate of the sulfur hexafluoride. The leaked sulfur hexafluoride is collected by the gas collecting cover, the leaked sulfur hexafluoride is introduced into the U-shaped measuring tube through the gas guide tube, the pressure intensity of gas in the U-shaped measuring tube is increased by the introduced sulfur hexafluoride, liquid level scales are reduced, the volume of the leaked sulfur hexafluoride can be indirectly measured by reading the change value of the liquid level scales within a certain time, the mass leakage rate of a leakage point is calculated, the absolute gas leakage rate of the leakage point of sulfur hexafluoride electrical equipment is rapidly and accurately measured, and whether other leakage points exist in the sulfur hexafluoride electrical equipment or not is judged by comparing with the whole weight loss rate of the electrical equipment.
Description
Technical Field
The application relates to the technical field of electrical equipment leakage detection, in particular to a quantitative test method and system for absolute air leakage rate of sulfur hexafluoride electrical equipment.
Background
The sulfur hexafluoride is a colorless, odorless and nontoxic inert gas, has high insulating strength, excellent arc extinguishing performance, cooling characteristic, incombustibility and thermal stability, and can effectively reduce equipment cost and equipment volume, so that the sulfur hexafluoride is widely applied to high-voltage electrical equipment of 10kV, 35kV, 110kV and above.
According to statistical analysis, the leakage defect of the sulfur hexafluoride electrical equipment accounts for 40% -60% of the total number of the equipment defects. When the equipment has a leak point, the following three hazards exist: firstly, the pressure of a leakage air chamber is gradually reduced, so that the arc extinguishing and insulating capabilities of gas are reduced, and equipment is locked when the pressure is reduced to a set value; secondly, the partial pressure of water vapor in the air is far greater than that in the air chamber, and the water vapor enters the air chamber from a leakage part through diffusion, so that the humidity of sulfur hexafluoride in the equipment is increased, the insulating property and the arc extinguishing property of the sulfur hexafluoride are reduced, and the safe operation of the equipment is endangered; and thirdly, the sulfur hexafluoride is one of six greenhouse gases specified in the United nations climate change convention and the Kyoto protocol, the greenhouse effect of the sulfur hexafluoride is 23900 times of that of carbon dioxide, the sulfur hexafluoride is not easy to degrade, and the sulfur hexafluoride gas leaked into the environment can bring about serious greenhouse effect. Therefore, it is important to perform the leakage detection and leakage point elimination of the sulfur hexafluoride electrical equipment at regular intervals.
At present, a method for testing the leakage rate of a leakage point of sulfur hexafluoride electrical equipment comprises the following steps: pressure drop, snap-on closure, bottle hanging and partial bundling. Wherein, the pressure drop method can only test the relative leakage rate of the sulfur hexafluoride; the cover buckling method and the local bundling method are complex to operate and the leakage volume is not easy to calculate accurately; in the bottle hanging method, the hanging bottle needs to be taken down to determine the concentration of the sulfur hexafluoride after collecting the leaked gas, and the gas possibly overflows in the operation process, so that the measurement result is inaccurate.
Disclosure of Invention
The application provides a quantitative test method and system for the quality leakage rate of sulfur hexafluoride electrical equipment, and aims to solve the technical problem that the leakage rate of a leakage point of the sulfur hexafluoride electrical equipment is inaccurate to measure.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
in a first aspect, a quantitative test system for absolute air leakage rate of sulfur hexafluoride electrical equipment comprises: the method comprises the following steps: a gas collection device, wherein:
the gas collection device includes: the gas collecting cover is connected with one end of the U-shaped measuring tube through a gas guide tube;
the U-shaped measuring pipe wall is provided with volume scales.
Optionally, the quantitative test system for mass leakage rate further includes: temperature measuring device, pressure measuring device, timing device and calculation module, wherein:
the temperature measuring device, the pressure measuring device and the timing device are respectively in communication connection with the computing module;
the temperature measuring device is used for measuring environmental temperature data and uploading the environmental temperature data to the computing module;
the pressure measuring device is used for measuring environmental pressure data and uploading the environmental pressure data to the computing module;
the timing device is used for metering the gas collection time and uploading the time to the calculation module;
and the data calculation module is used for receiving the environment temperature data, the environment pressure data and the time, and calculating the mass leakage rate of the sulfur fluoride electrical equipment according to the gas volume collected by the gas collection device.
Optionally, the gas collecting device further comprises: the liquid feeding funnel, the liquid feeding funnel with the other end intercommunication of U type survey buret is used for to leading-in liquid in the U type survey buret.
Optionally, the gas collecting cover is made of silicon rubber, and the gas guide tube is a polytetrafluoroethylene tube with the diameter of 4 mm.
Optionally, the volume scale range of the volume scale is 0-5 mL, and the minimum scale is 0.05 mL.
In a second aspect, the embodiment of the application discloses a quantitative test method for the quality leakage rate of sulfur hexafluoride electrical equipment, which comprises the following steps: measuring the volume of sulfur hexafluoride gas leaked from a leakage point of sulfur hexafluoride electrical equipment within a certain time period, wherein the time period is marked as t, and the volume of the leaked sulfur hexafluoride gas is marked as V;
calculating the absolute air leakage rate of a leakage point of sulfur hexafluoride electrical equipment, and recording the absolute air leakage rate as F, wherein F is V/t;
measuring and recording the temperature and the pressure on site, wherein the temperature is recorded as T, and the pressure is recorded as P;
calculating the mass leakage rate of the sulfur hexafluoride, wherein F' is MPV/RTt (MP/RT) F, and the mass leakage rate is as follows: m is the molar mass of sulfur hexafluoride, and R is an ideal gas state constant.
Optionally, the measuring the volume of the sulfur hexafluoride gas leaked by the leakage point of the sulfur hexafluoride electrical equipment in a certain time period includes:
s1, injecting liquid into the U-shaped measuring tube, and reading the initial liquid level scale V0 of the U-shaped measuring tube;
s2, fixing the gas collecting cover at the position of a leakage point of the sulfur hexafluoride gas chamber, and starting a timing device to start timing;
s3, after a certain time t, reading the liquid level scale V1 again;
and S4, recording the change value of the liquid level scale, namely the volume V of sulfur hexafluoride leakage, namely V1-V0.
Optionally, fixing the gas collecting cover at the position of the leakage point of the sulfur hexafluoride gas chamber includes: and coating sealant on the edge of the bottom of the gas collection cover, and bonding the gas collection cover at the leakage point position of the sulfur hexafluoride gas chamber.
Compared with the prior art, the beneficial effect of this application is:
the application provides a quantitative test method and a system for the quality leakage rate of sulfur hexafluoride electrical equipment, wherein the method comprises the following steps: measuring the volume of sulfur hexafluoride gas leaked from a leakage point of sulfur hexafluoride electrical equipment within a certain period of time; calculating the absolute air leakage rate of a leakage point of sulfur hexafluoride electrical equipment, and measuring and recording the temperature and the pressure on site; calculating the mass leakage rate of sulfur hexafluoride. The leaked sulfur hexafluoride is collected by the gas collecting cover, the leaked sulfur hexafluoride is introduced into the U-shaped measuring tube through the gas guide tube, the pressure intensity of gas in the U-shaped measuring tube is increased by the introduced sulfur hexafluoride, liquid level scales are reduced, the volume of the leaked sulfur hexafluoride can be indirectly measured by reading the change value of the liquid level scales within a certain time, the mass leakage rate of a leakage point is calculated, the absolute gas leakage rate of the leakage point of sulfur hexafluoride electrical equipment is rapidly and accurately measured, and whether other leakage points exist in the sulfur hexafluoride electrical equipment or not is judged by comparing with the whole weight loss rate of the electrical equipment.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a gas collecting device according to an embodiment of the present disclosure;
wherein: 1-sulfur hexafluoride electrical equipment; 2-leakage point; 3-a gas collection hood; 4-gas-guide tube; 5-U-shaped measuring tube; 6-volume scale; 7-liquid adding funnel.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a quantitative test system of sulfur hexafluoride electrical equipment quality leakage rate, include: gas collection device, temperature measuring device, pressure measuring device, timing device and calculation module, wherein:
the temperature measuring device, the pressure measuring device and the timing device are respectively in communication connection with the computing module;
the temperature measuring device is used for measuring environmental temperature data and uploading the environmental temperature data to the computing module;
the pressure measuring device is used for measuring environmental pressure data and uploading the environmental pressure data to the computing module;
the timing device is used for metering the gas collection time and uploading the time to the calculation module;
and the data calculation module is used for receiving the environment temperature data, the environment pressure data and the time, and calculating the mass leakage rate of the sulfur fluoride electrical equipment according to the gas volume collected by the gas collection device.
Specifically, as shown in fig. 1, the gas collecting device includes: the gas collecting cover and the U-shaped measuring pipe are connected through a gas guide pipe. The liquid feeding funnel is communicated with the other end of the U-shaped measuring pipe and used for guiding liquid into the U-shaped measuring pipe.
The U-shaped measuring pipe wall is provided with volume scales. The transparent glass is made into a U-shaped measuring tube, and volume scales are marked on one side of the U-shaped measuring tube; the top end of the other side is connected with a liquid adding funnel. In order to improve the accuracy of measurement, the volume scale range is 0-5 mL, and the minimum scale is 0.05 mL.
4mm polytetrafluoroethylene pipe air guide pipe 4's one end is connected on the 6 tops of volume scale pipe of U type survey buret 5, and the other end is connected on the top of gas collection cover 3, makes gas collection cover with the intraduct switches on is surveyed to the U type. Keeping the U-shaped measuring tube 5 vertical, and adding clear water from the liquid adding funnel 7.
On the other hand, the embodiment of the application provides a quantitative test method for the quality leakage rate of sulfur hexafluoride electrical equipment, which comprises the following steps:
measuring the volume of sulfur hexafluoride gas leaked from a leakage point of sulfur hexafluoride electrical equipment within a certain time period, wherein the time period is recorded as t, and the volume of the leaked sulfur hexafluoride gas is recorded as V. The method comprises the following specific steps:
s1, injecting liquid into the U-shaped measuring tube from the liquid adding funnel, wherein the liquid can be clear water or any liquid immiscible with sulfur hexafluoride gas, reading the initial liquid level scale of the U-shaped measuring tube, and recording the initial liquid level scale as V0, wherein V is0＝0.55mL；
S2, coating sealant on the edge of the bottom of the gas collection cover, completely covering a leak point of the sulfur hexafluoride gas chamber in the gas collection cover, fixing the gas collection cover at the leak point of the sulfur hexafluoride gas chamber, and starting a timing device to start timing;
and S3, after a certain time t, reading the liquid level scale V1 again. As the gas is gradually collected, the liquid level in the volume scale tube gradually drops, and after a certain time, the liquid level scale V1 is read again, where t is 125s and V1 is 4.00 mL.
And S4, recording the change value of the liquid level scale, namely the volume V of sulfur hexafluoride leakage, namely V1-V0 is 3.45 mL.
The calculation module can calculate the absolute air leakage rate of the leakage point of the sulfur hexafluoride electrical equipment according to the volume of the leakage of the sulfur hexafluoride, and the absolute air leakage rate is recorded as F, wherein the F is V/t. Where F is (4.00-0.55)/125 × 60 is 1.656 mL/min.
The temperature and pressure at the site were measured and recorded, with T293K and P80110 Pa. The temperature measuring device is used for measuring environment temperature data and uploading the environment temperature data to the computing module, and the pressure measuring device is used for measuring environment pressure data and uploading the environment pressure data to the computing module.
And the calculation module can calculate the mass leakage rate of the sulfur hexafluoride according to the environmental temperature data, the environmental pressure data, the gas collection time and the volume of the sulfur hexafluoride leakage, and the mass leakage rate is marked as F'.
F'＝MPV/RTt＝(MP/RT)·F
Wherein: m is the molar mass of sulfur hexafluoride of 146g/mol, and R is the ideal gas state constant of 8.314J/mol · K. Calculated here as F' ═ (146 × 80110)/(8.314 × 293) × 1.656 × 10-3＝7.95mg/min，
And judging whether other leakage points exist in the sulfur hexafluoride electrical equipment or not by comparing the loss rate of the whole weight of the electrical equipment. And if the whole weight loss rate of the electrical equipment is greater than the mass leakage rate of the sulfur hexafluoride, indicating that other leakage points exist in the sulfur hexafluoride electrical equipment.
The whole weight loss rate of the electrical equipment can be obtained by calculating the whole weight loss of the electrical equipment in a certain time period and dividing the whole weight loss by the corresponding time. The overall weight loss of the electrical equipment in a certain time period can be conveniently calculated through the initial and final pressures P1 and P2 of a sulfur hexafluoride density relay of the electrical equipment in a certain time period and the filling gas quality marked by an equipment nameplate according to a formula (P1-P2)/(P1+0.1) multiplied by the filling gas quality.
Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (8)
1. The utility model provides a quantitative test system of sulfur hexafluoride electrical equipment quality leakage rate which characterized in that includes: a gas collection device, wherein:
the gas collection device includes: the gas collecting cover (3) is connected with one end of the U-shaped measuring pipe (5) through a gas guide pipe (4);
the pipe wall of the U-shaped measuring pipe (5) is provided with volume scales (6).
2. The quantitative mass leak rate test system of claim 1, further comprising: temperature measuring device, pressure measuring device, timing device and calculation module, wherein:
the temperature measuring device, the pressure measuring device and the timing device are respectively in communication connection with the computing module;
the temperature measuring device is used for measuring environmental temperature data and uploading the environmental temperature data to the computing module;
the pressure measuring device is used for measuring environmental pressure data and uploading the environmental pressure data to the computing module;
the timing device is used for metering the gas collection time and uploading the time to the calculation module;
and the data calculation module is used for receiving the environment temperature data, the environment pressure data and the time, and calculating the mass leakage rate of the sulfur fluoride electrical equipment according to the gas volume collected by the gas collection device.
3. The quantitative mass leak rate testing system of claim 2, wherein the gas collection apparatus further comprises: liquid adding funnel (7), liquid adding funnel (7) with the other end intercommunication of buret (5) is surveyed to the U type, be used for to leading-in liquid in buret (5) is surveyed to the U type.
4. The quantitative test system for mass leakage rate according to claim 1, wherein the gas collecting hood (3) is made of silicon rubber, and the gas guide tube (4) is a 4mm polytetrafluoroethylene tube.
5. The quantitative test system for mass leakage rate according to claim 1, characterized in that the volume scale range of the volume scale (6) is 0-5 mL, and the minimum scale is 0.05 mL.
6. A quantitative test method for the mass leakage rate of sulfur hexafluoride electrical equipment is characterized in that,
measuring the volume of sulfur hexafluoride gas leaked from a leakage point of sulfur hexafluoride electrical equipment within a certain time period, wherein the time period is marked as t, and the volume of the leaked sulfur hexafluoride gas is marked as V;
calculating the absolute air leakage rate of a leakage point of sulfur hexafluoride electrical equipment, and recording the absolute air leakage rate as F, wherein F is V/t;
measuring and recording the temperature and the pressure on site, wherein the temperature is recorded as T, and the pressure is recorded as P;
calculating the mass leakage rate of the sulfur hexafluoride, wherein F' is MPV/RTt (MP/RT) F, and the mass leakage rate is as follows: m is the molar mass of sulfur hexafluoride, and R is an ideal gas state constant.
7. The quantitative test method for mass leakage rate of claim 6, wherein the measuring the volume of sulfur hexafluoride gas leaking from a leakage point of sulfur hexafluoride electrical equipment in a certain period of time comprises:
s1, injecting liquid into the U-shaped measuring tube, and reading the initial liquid level scale V0 of the U-shaped measuring tube;
s2, fixing the gas collecting cover at the position of a leakage point of the sulfur hexafluoride gas chamber, and starting a timing device to start timing;
s3, after a certain time t, reading the liquid level scale V1 again;
and S4, recording the change value of the liquid level scale, namely the volume V of sulfur hexafluoride leakage, namely V1-V0.
8. The method of claim 7, wherein said securing a gas capture enclosure at a leak point in a sulfur hexafluoride gas chamber comprises: and coating sealant on the edge of the bottom of the gas collection cover, and bonding the gas collection cover at the leakage point position of the sulfur hexafluoride gas chamber.
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Cited By (4)
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| CN111766029A (en) * | 2020-05-30 | 2020-10-13 | 湖北德普电气股份有限公司 | Hydrogen fuel cell stack leakage rate testing device and method |
| CN112649153A (en) * | 2020-11-27 | 2021-04-13 | 国网冀北电力有限公司电力科学研究院 | Method, device and equipment for detecting air tightness of closed equipment |
| CN113405740A (en) * | 2021-06-21 | 2021-09-17 | 北京卫星环境工程研究所 | Fluoride leakage detection equipment and detection method |
| CN115264374A (en) * | 2022-07-22 | 2022-11-01 | 国网上海市电力公司 | Method for estimating air supply time and air supply amount of sulfur hexafluoride high-voltage switch |
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