GIS equipment leak detection device and method based on double buckling covers

Abstract

The invention discloses a GIS equipment leak detection device and method based on double buckle covers, in the GIS equipment leak detection device, a first buckle cover covers a GIS equipment pipeline joint and is in sealing connection with a GIS equipment pipeline, and the first buckle cover, the GIS equipment pipeline joint and the GIS equipment pipeline form a first closed space. The second buckling cover covers the first buckling cover and is connected with the GIS equipment pipeline in a sealed mode, and the second buckling cover, the first buckling cover and the GIS equipment pipeline form a second closed space. The first buckle cover connector is arranged on the first buckle cover and used for vacuumizing the first closed space. The second buckle cover connector is arranged on the second buckle cover and used for vacuumizing the second closed space and filling the second closed space with filling gas different from the GIS equipment insulating gas. And the vacuum degree sensor is arranged in the first buckling cover. And the filling gas sensor is arranged in the first buckling cover. According to the leakage detection device for the GIS equipment, the gas leakage condition of the pipeline joint of the GIS equipment can be monitored on line in real time according to the change of detection numerical values of the vacuum degree sensor and the filling gas sensor.

Description

Technical Field

[0001] The invention relates to the field of GIS equipment leakage detection, and in particular to a GIS equipment leakage detection device and method based on a double buckle cover. Background Art

[0002] Sulfur hexafluoride (SF6) is widely used in various high and medium voltage electrical equipment due to its excellent insulation and arc extinguishing capabilities. However, SF6 is a strong greenhouse gas, and its global warming potential is about 23,900 times that of CO2. Dry air, as a substitute for SF6, has been successfully used in high and medium voltage GIS (gas-insulated switchgear).

[0003] Due to factors such as product manufacturing quality, improper installation and equipment aging, insulating gas leakage may occur in operating GIS equipment, resulting in a decrease in chamber air pressure, which directly affects its breaking performance and is not conducive to the safe and stable operation of power equipment. Therefore, regular insulating gas leak detection is the focus of GIS equipment operation and maintenance. At present, the main leak detection method is to detect insulating gas leaked into the external environment through a leak detector, such as using a pump-suction spectrometer leak detector to detect leaks in SF6 gas GIS equipment. However, the main component of the external environment is air, and dry air GIS equipment is difficult to be effectively detected after leaking into the external environment. Therefore, it is urgent to propose a new leak detection method for dry air GIS equipment leak detection. Summary of the invention

[0004] The present invention provides a GIS equipment leakage detection device and method based on a double buckle cover, which can monitor the gas leakage situation at the flange part of the dry air GIS equipment.

[0005] The present invention discloses a GIS equipment leak detection device based on a double buckle cover, comprising a first buckle cover, a second buckle cover, a first buckle cover joint, a second buckle cover joint, a vacuum sensor, and a filling gas sensor. The first buckle cover is buckled outside the GIS equipment pipeline joint and is sealed with the GIS equipment pipeline. The first buckle cover, the GIS equipment pipeline joint, and the GIS equipment pipeline form a first closed space. The second buckle cover is buckled outside the first buckle cover and is sealed with the GIS equipment pipeline. The second buckle cover, the first buckle cover, and the GIS equipment pipeline form a second closed space. The first buckle cover joint is arranged on the first buckle cover, and is used to evacuate the first closed space. The second buckle cover joint is arranged on the second buckle cover, and is used to evacuate the second closed space and fill it with a filling gas different from the insulating gas of the GIS equipment. The vacuum sensor is arranged in the first buckle cover, and is used to detect the gas pressure in the first closed space after the first closed space is evacuated. The filling gas sensor is arranged in the first buckle cover, and is used to detect the filling gas concentration in the first closed space after the second closed space is evacuated and filled with the filling gas.

[0006] In some of the embodiments, the first buckle cover and the second buckle cover are both cylindrical structures whose center lines coincide with the center line of the GIS equipment pipeline.

[0007] In some embodiments, the vacuum sensor and the filling gas sensor are both mounted on the inner wall of the first buckle cover.

[0008] In some of the embodiments, both the first snap-on cover joint and the second snap-on cover joint are installed with a switch valve.

[0009] The present invention discloses a GIS equipment leak detection method using the above-mentioned GIS equipment leak detection device, comprising the following steps: vacuuming a first enclosed space and a second enclosed space respectively through a first buckle cover joint and a second buckle cover joint. Filling a filling gas different from the insulating gas of the GIS equipment into the second enclosed space through the second buckle cover joint. Using a vacuum sensor and a filling gas sensor, respectively, the gas pressure in the first enclosed space and the filling gas concentration in the second enclosed space are detected, and according to the detection values ​​of the vacuum sensor and the filling gas sensor, it is judged whether there is air leakage in the GIS equipment pipeline joint.

[0010] In some of the embodiments, whether air leakage occurs in the pipe joint of the GIS equipment is determined based on the detection values ​​of the vacuum sensor and the filling gas sensor, including: when the detection value of the vacuum sensor changes and the detection value of the filling gas sensor does not change, it is determined that air leakage occurs in the pipe joint of the GIS equipment.

[0011] In some of the embodiments, after it is determined that air leakage occurs at the pipe joint of the GIS equipment, the leakage amount is calculated based on the detection value of the vacuum sensor.

[0012] In some of the embodiments, whether air leakage occurs in the pipe joint of the GIS equipment is determined based on the detection values ​​of the vacuum sensor and the filling gas sensor, including: when the detection value of the vacuum sensor changes and the detection value of the filling gas sensor also changes, it is determined that the airtightness of the first buckle cover is insufficient, and the filling gas in the second confined space leaks into the first confined space, and then the filling gas pressure P2 in the first confined space is calculated based on the detection value c of the filling gas sensor, and P2 is compared with the detection value P1 of the vacuum sensor. When P1 is greater than P2, and the difference between P1 and P2 exceeds a certain range, it is determined that the first buckle cover and the pipe joint of the GIS equipment are leaking at the same time.

[0013] In some of the embodiments, when the difference between P1 and P2 is within a certain range, it is determined that the first buckle cover is leaking.

[0014] In some embodiments, when calculating the filling gas pressure P2 in the first buckle cover from the detection data c of the filling gas sensor, the ideal gas state equation is used, where c=n / V, PV=nRT. Where: P is the gas pressure, in Pa. V is the gas volume, in m 3 T is the gas temperature, in K. n is the amount of gas, in mol. R is the universal gas constant, in J / (mol·K).

[0015] According to an embodiment of the present invention, a GIS equipment leak detection device based on a double buckle cover is provided, comprising a first buckle cover, a second buckle cover, a first buckle cover joint, a second buckle cover joint, a vacuum sensor, and a filling gas sensor. The first buckle cover is buckled outside the GIS equipment pipeline joint and is sealed with the GIS equipment pipeline. The first buckle cover, the GIS equipment pipeline joint, and the GIS equipment pipeline form a first enclosed space. The second buckle cover is buckled outside the first buckle cover and is sealed with the GIS equipment pipeline. The second buckle cover, the first buckle cover, and the GIS equipment pipeline form a second enclosed space. The first buckle cover joint is arranged on the first buckle cover, and is used to evacuate the first enclosed space. The second buckle cover joint is arranged on the second buckle cover, and is used to evacuate the second enclosed space and fill it with a filling gas different from the insulating gas of the GIS equipment. The vacuum sensor is arranged in the first buckle cover, and is used to detect the gas pressure in the first enclosed space after the first enclosed space is evacuated. The filling gas sensor is arranged in the first buckle cover, and is used to detect the filling gas concentration in the first enclosed space after the second enclosed space is evacuated and filled with the filling gas. The GIS equipment leak detection device proposed in the present invention can monitor the gas leakage of the GIS equipment pipeline joints in real time online according to the changes in the detection values ​​of the vacuum sensor and the filling gas sensor, such as the flange part of the dry air GIS equipment, thereby improving the speed and accuracy of GIS equipment leakage detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a front view of a double buckle cover in an embodiment of the present invention;

[0018] Figure 2 It is a side view of the double buckle cover in the embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] See also Figure 1-2 An embodiment of the present invention discloses a GIS equipment leak detection device based on a double buckle cover, wherein the GIS equipment is a dry air GIS equipment, and the GIS equipment leak detection device includes a first buckle cover 1, a second buckle cover 2, a first buckle cover joint 5, a second buckle cover joint 6, a vacuum sensor 3, and a filling gas sensor 4.

[0021] The first buckle cover 1 is buckled on the outside of the GIS equipment pipeline joint. The first buckle cover 1 is a cylindrical structure whose center line coincides with the center line of the GIS equipment pipeline. The first buckle cover 1 is sealed and spliced ​​with two semi-cylindrical plastic shells. The first buckle cover 1 is sealed and connected to the GIS equipment pipeline. The first buckle cover 1 and the GIS equipment pipeline are sealed with a special clamp for easy disassembly. In addition, a special elastic rubber sealing ring is designed, molded, and compression molded, which can not only seal the connection between the semi-cylindrical plastic shell of the first buckle cover 1, but also seal the connection between the first buckle cover 1 and the GIS equipment pipeline. The GIS equipment pipeline joint can be the flange part of the GIS equipment pipeline, or it can be other parts of the GIS equipment pipeline where insulating gas leakage may occur, such as valves, welds, etc. The first buckle cover 1, the GIS equipment pipeline joint, and the GIS equipment pipeline form a first enclosed space.

[0022] The second buckle cover 2 is buckled outside the first buckle cover 1. The second buckle cover 2 is a cylindrical structure whose center line coincides with the center line of the GIS equipment pipeline. The second buckle cover 2 is sealed and spliced ​​with two semi-cylindrical plastic shells. The second buckle cover 2 is sealed and connected to the GIS equipment pipeline. The second buckle cover 2 and the GIS equipment pipeline are sealed with a special clamp for easy disassembly. In addition, a special elastic rubber sealing ring is designed, molded and compression molded, which can not only seal the connection between the semi-cylindrical plastic shell of the second buckle cover 2, but also seal the connection between the second buckle cover 2 and the GIS equipment pipeline. The second buckle cover 2, the first buckle cover 1 and the GIS equipment pipeline form a second enclosed space.

[0023] The first buckle cover joint 5 is arranged on the first buckle cover 1, and is used for evacuating the first enclosed space. The first buckle cover joint 5 is equipped with a switch valve.

[0024] The second buckle cover joint 6 is arranged on the second buckle cover 2, and is used to evacuate the second enclosed space and fill it with a filling gas different from the insulating gas of the GIS equipment. The first buckle cover joint 5 is installed with a switch valve. When the insulating gas of the GIS equipment is dry air, the filling gas can be SF6 gas. When the insulating gas of the GIS equipment is SF6 gas, the filling gas is non-SF6 gas.

[0025] Through the above arrangement, after the first buckle cover 1 and the second buckle cover 2 are installed, the switch valve is opened, and the first enclosed space and the second enclosed space are evacuated through the first buckle cover joint 5 and the second buckle cover joint 6, respectively, and the switch valve is closed after the evacuation reaches the set value. A certain amount of filling gas is filled into the second enclosed space through the second buckle cover joint 6, and the switch valve is closed after the filling is completed.

[0026] The vacuum sensor 3 is disposed in the first buckle cover 1 and is used to detect the gas pressure in the first closed space after the first closed space is evacuated. The vacuum sensor 3 is installed on the inner wall of the first buckle cover 1.

[0027] The filling gas sensor 4 is arranged in the first buckle cover 1, and is used to detect the filling gas concentration in the first enclosed space after the second enclosed space is evacuated and filled with filling gas. The filling gas sensor 4 is installed on the inner wall of the first buckle cover 1. A micro pump is installed at the air outlet of the filling gas sensor 4. The negative pressure formed after the pump is started causes the filling gas to flow in from the air inlet, thereby realizing the detection of the filling gas. When the filling gas is SF6 gas, the filling gas sensor 4 is an SF6 sensor. When the filling gas is non-SF6 gas, the filling gas sensor 4 is the non-SF6 gas sensor.

[0028] The embodiment of the present invention discloses a GIS equipment leak detection method using the above-mentioned GIS equipment leak detection device, comprising the following steps:

[0029] (1) The first enclosed space and the second enclosed space are evacuated through the first snap-on cover joint 5 and the second snap-on cover joint 6 respectively.

[0030] (2) Filling gas different from the insulating gas of the GIS equipment into the second enclosed space through the second buckle cover joint 6.

[0031] (3) The gas pressure in the first enclosed space and the filling gas concentration in the second enclosed space are detected by the vacuum sensor 3 and the filling gas sensor 4 respectively. According to the detection values ​​of the vacuum sensor 3 and the filling gas sensor 4, it is determined whether there is air leakage in the pipeline joint of the GIS equipment.

[0032] According to the detection values ​​of the vacuum sensor 3 and the filling gas sensor 4, it is judged whether there is air leakage in the GIS equipment pipeline joint, including: when the detection value of the vacuum sensor 3 changes and the detection value of the filling gas sensor 4 does not change, it is judged that there is air leakage in the GIS equipment pipeline joint. After it is judged that there is air leakage in the GIS equipment pipeline joint, the leakage amount is calculated according to the detection value of the vacuum sensor 3.

[0033] According to the detection values ​​of the vacuum sensor 3 and the filling gas sensor 4, it is judged whether there is air leakage in the pipeline joint of the GIS equipment, and it also includes: when the detection value of the vacuum sensor 3 changes and the detection value of the filling gas sensor 4 also changes, it is judged that the air tightness of the first buckle cover 1 is insufficient, and the filling gas in the second closed space leaks into the first closed space, and then the filling gas pressure P2 in the first closed space is calculated by the detection value c of the filling gas sensor 4, and the size of P2 is compared with the detection value P1 of the vacuum sensor 3. When P1 is greater than P2, and the difference between P1 and P2 exceeds a certain range, that is, P1 is much greater than P2, it is judged that the first buckle cover 1 and the GIS equipment pipeline joint are leaking at the same time. When the difference between P1 and P2 is within a certain range, that is, P1 and P2 are similar in size, it is judged that the first buckle cover is leaking. When calculating the filling gas pressure P2 in the first buckle cover 1 from the detection data c of the filling gas sensor 4, the ideal gas state equation is used, where c=n / V, PV=nRT. In the formula: P is the gas pressure, unit Pa. V is the gas volume, unit m 3 T is the gas temperature, in K. n is the amount of gas, in mol. R is the universal gas constant, in J / (mol·K).

[0034] The GIS equipment leak detection device and method proposed in the present invention can monitor the gas leakage of the GIS equipment pipeline joints in real time online according to the changes in the values ​​detected by the vacuum sensor 3 and the filling gas sensor 4, thereby improving the speed and accuracy of GIS equipment leak detection. It should be noted that the GIS equipment leak detection device and method proposed in the present invention can be applied to dry air GIS equipment leak detection, and can also be applied to other insulating medium electrical equipment leak detection. The GIS equipment leak detection device and method proposed in the present invention can be applied to GIS equipment flange leak detection, and can also be applied to other parts of electrical equipment leak detection.

[0035] Example 1

[0036] This embodiment discloses a GIS equipment leak detection device based on a double buckle cover, wherein the GIS equipment is a dry air GIS equipment, and the GIS equipment leak detection device includes a first buckle cover 1, a second buckle cover 2, a first buckle cover joint 5, a second buckle cover joint 6, a vacuum sensor 3, and an SF6 sensor.

[0037] The first buckle cover 1 is buckled on the outside of the GIS equipment flange. The first buckle cover 1 is a cylindrical structure whose center line coincides with the center line of the GIS equipment pipeline. The first buckle cover 1 is sealed and spliced ​​with two semi-cylindrical plastic shells. The first buckle cover 1 is sealed and connected to the GIS equipment pipeline. The first buckle cover 1 and the GIS equipment pipeline are sealed with a special clamp for easy disassembly. In addition, a special elastic rubber sealing ring is designed, molded, and compression molded, which can not only seal the connection between the semi-cylindrical plastic shell of the first buckle cover 1, but also seal the connection between the first buckle cover 1 and the GIS equipment pipeline. The first buckle cover 1, the GIS equipment flange, and the GIS equipment pipeline form a first enclosed space.

[0038] The second buckle cover 2 is buckled outside the first buckle cover 1. The second buckle cover 2 is a cylindrical structure whose center line coincides with the center line of the GIS equipment pipeline. The second buckle cover 2 is sealed and spliced ​​with two semi-cylindrical plastic shells. The second buckle cover 2 is sealed and connected to the GIS equipment pipeline. The second buckle cover 2 and the GIS equipment pipeline are sealed with a special clamp for easy disassembly. In addition, a special elastic rubber sealing ring is designed, molded and compression molded, which can not only seal the connection between the semi-cylindrical plastic shell of the second buckle cover 2, but also seal the connection between the second buckle cover 2 and the GIS equipment pipeline. The second buckle cover 2, the first buckle cover 1 and the GIS equipment pipeline form a second enclosed space.

[0039] The first buckle cover joint 5 is arranged on the first buckle cover 1, and is used for evacuating the first enclosed space. The first buckle cover joint 5 is equipped with a switch valve.

[0040] The second buckle cover joint 6 is arranged on the second buckle cover 2, and is used to evacuate the second enclosed space and fill it with SF6 gas. The first buckle cover joint 5 is equipped with a switch valve.

[0041] Through the above arrangement, after the first buckle cover 1 and the second buckle cover 2 are installed, the switch valve is opened, and the first enclosed space and the second enclosed space are evacuated through the first buckle cover joint 5 and the second buckle cover joint 6, respectively, and the switch valve is closed after the evacuation reaches the set value. A certain amount of SF6 gas is filled into the second enclosed space through the second buckle cover joint 6, and the switch valve is closed after the filling is completed.

[0042] The vacuum sensor 3 is disposed in the first buckle cover 1 and is used to detect the gas pressure in the first closed space after the first closed space is evacuated. The vacuum sensor 3 is installed on the inner wall of the first buckle cover 1.

[0043] The SF6 sensor is arranged in the first buckle cover 1, and is used to detect the SF6 gas content in the first enclosed space after the second enclosed space is evacuated and filled with SF6 gas. The SF6 sensor is installed on the inner wall of the first buckle cover 1. A micro pump is installed at the gas outlet of the SF6 sensor. The negative pressure formed after the pump is started causes SF6 gas to flow in from the gas inlet, thereby realizing the detection of SF6 gas.

[0044] Example 2

[0045] This embodiment discloses a GIS equipment leak detection method using the GIS equipment leak detection device of embodiment 1, comprising the following steps:

[0046] (1) The first enclosed space and the second enclosed space are evacuated through the first snap-on cover joint 5 and the second snap-on cover joint 6 respectively.

[0047] (2) Fill the second enclosed space with SF6 gas through the second buckle cover joint 6.

[0048] (3) The gas pressure in the first enclosed space and the SF6 gas content in the second enclosed space are detected by the vacuum sensor 3 and the SF6 sensor respectively. According to the detection values ​​of the vacuum sensor 3 and the SF6 sensor, it is determined whether there is air leakage in the flange of the GIS equipment.

[0049] According to the detection values ​​of the vacuum sensor 3 and the SF6 sensor, it is judged whether there is air leakage at the flange of the GIS equipment, including: when the detection value of the vacuum sensor 3 changes and the detection value of the SF6 sensor does not change, it is judged that there is air leakage at the flange of the GIS equipment. After it is judged that there is air leakage at the flange of the GIS equipment, the leakage amount is calculated according to the detection value of the vacuum sensor 3.

[0050] According to the detection values ​​of the vacuum sensor 3 and the SF6 sensor, it is judged whether there is air leakage at the flange of the GIS equipment, and it also includes: when the detection value of the vacuum sensor 3 changes and the detection value of the SF6 sensor also changes, it is judged that the air tightness of the first buckle cover 1 is insufficient, and the SF6 gas in the second confined space leaks into the first confined space, and then the SF6 gas pressure P2 in the first confined space is calculated by the detection value c of the SF6 sensor, and the size of P2 is compared with the detection value P1 of the vacuum sensor 3. When P1 is greater than P2, and the difference between P1 and P2 exceeds a certain range, that is, P1 is much greater than P2, it is judged that the first buckle cover 1 and the GIS equipment flange are leaking at the same time. When the difference between P1 and P2 is within a certain range, that is, P1 and P2 are similar in size, it is judged that the first buckle cover is leaking. When calculating the SF6 gas pressure P2 in the first buckle cover 1 from the detection data c of the SF6 sensor, the ideal gas state equation is used, where c=n / V, PV=nRT. In the formula: P is the gas pressure, unit Pa. V is the gas volume, unit m 3 T is the gas temperature, in K. n is the amount of gas, in mol. R is the universal gas constant, in J / (mol·K).

[0051] In view of the lack of dry air GIS equipment leak detection technology, the present invention proposes a GIS equipment leak detection device and method based on a double buckle cover, which can monitor the gas leakage at the flange of the dry air GIS equipment in real time online according to the changes in the detection values ​​of the vacuum sensor 3 and the SF6 sensor, thereby improving the speed and accuracy of GIS equipment leak detection.

[0052] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A GIS equipment leak detection device based on a double buckle cover, characterized in that: include: A first buckle cover, which is buckled outside the GIS equipment pipeline joint and is sealed with the GIS equipment pipeline. The first buckle cover, the GIS equipment pipeline joint, and the GIS equipment pipeline form a first closed space; A second buckle cover, which is buckled outside the first buckle cover and is sealed and connected to the GIS equipment pipeline. The second buckle cover, the first buckle cover and the GIS equipment pipeline form a second enclosed space; A first buckle cover joint, provided on the first buckle cover, for evacuating the first enclosed space; A second buckle cover joint, arranged on the second buckle cover, for evacuating the second enclosed space and filling it with a filling gas different from the insulating gas of the GIS equipment; a vacuum sensor, disposed in the first buckle cover, for detecting the gas pressure in the first enclosed space after the first enclosed space is evacuated; The filling gas sensor is arranged in the first buckle cover and is used to detect the filling gas concentration in the first enclosed space after the second enclosed space is evacuated and filled with the filling gas.

2. The GIS equipment leak detection device according to claim 1, characterized in that: The first buckle cover and the second buckle cover are both cylindrical structures whose center lines coincide with the center line of the GIS equipment pipeline.

3. The GIS equipment leak detection device according to claim 1, characterized in that: The vacuum degree sensor and the filling gas sensor are both installed on the inner wall of the first buckle cover.

4. The GIS equipment leak detection device according to claim 1, characterized in that: The first buckle cover joint and the second buckle cover joint are both equipped with switch valves.

5. A GIS equipment leak detection method using the GIS equipment leak detection device according to any one of claims 1 to 4, characterized in that: The following steps are involved: The first confined space and the second confined space are vacuumed respectively through the first buckle cover joint and the second buckle cover joint; Filling the second enclosed space with a filling gas different from the insulating gas of the GIS equipment through the second buckle cover joint; The gas pressure in the first enclosed space and the filling gas concentration in the second enclosed space are detected respectively by a vacuum sensor and a filling gas sensor, and whether air leakage occurs in the pipeline joint of the GIS equipment is determined based on the detection values ​​of the vacuum sensor and the filling gas sensor.

6. The GIS equipment leak detection method according to claim 5, characterized in that: Judging whether air leakage occurs at the GIS equipment pipeline joint according to the detection values ​​of the vacuum sensor and the filling gas sensor, including: When the detection value of the vacuum sensor changes and the detection value of the filling gas sensor does not change, it is determined that air leakage occurs in the pipeline joint of the GIS equipment.

7. The GIS equipment leak detection method according to claim 6, characterized in that: After determining that air leakage occurs at the pipe joint of the GIS equipment, the leakage amount is calculated based on the detection value of the vacuum sensor.

8. The GIS equipment leak detection method according to claim 5, characterized in that: Judging whether air leakage occurs at the GIS equipment pipeline joint according to the detection values ​​of the vacuum sensor and the filling gas sensor, including: When the detection value of the vacuum sensor changes and the detection value of the filling gas sensor also changes, it is determined that the airtightness of the first buckle cover is insufficient, and the filling gas in the second confined space leaks into the first confined space, and then the filling gas pressure P2 in the first confined space is calculated based on the detection value c of the filling gas sensor, and P2 is compared with the detection value P1 of the vacuum sensor. When P1 is greater than P2, and the difference between P1 and P2 exceeds a certain range, it is determined that the first buckle cover and the GIS equipment pipe joint are leaking at the same time.

9. The GIS equipment leak detection method according to claim 8, characterized in that: When the difference between P1 and P2 is within a certain range, it is determined that the first buckle cover is leaking.

10. The GIS equipment leak detection method according to claim 8, characterized in that: When calculating the filling gas pressure P2 in the first buckle cover from the detection data c of the filling gas sensor, the ideal gas state equation is used, where c=n / V, PV = nRT; Where: P is the gas pressure, unit is Pa; V is the gas volume, unit is m 3 ; T is the gas temperature, unit K; n is the amount of gas substance, unit mol; R is the universal gas constant, unit J / (mol·K).

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