CN212513508U - System for checking internal leakage of sulfur hexafluoride in oil-gas casing - Google Patents
System for checking internal leakage of sulfur hexafluoride in oil-gas casing Download PDFInfo
- Publication number
- CN212513508U CN212513508U CN202020894517.0U CN202020894517U CN212513508U CN 212513508 U CN212513508 U CN 212513508U CN 202020894517 U CN202020894517 U CN 202020894517U CN 212513508 U CN212513508 U CN 212513508U
- Authority
- CN
- China
- Prior art keywords
- connecting port
- oil
- sulfur hexafluoride
- internal leakage
- checking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
The utility model relates to a system for checking the internal leakage of sulfur hexafluoride in an oil gas casing, which comprises a sample introduction device, a four-way valve (6) and a detector (7) which are connected in sequence; the four-way valve (6) comprises a first connecting port (61), a second connecting port (62) and a fourth connecting port (64), the sample feeding device is connected with the first connecting port (61), the second connecting port (62) is communicated with the outside, and the fourth connecting port (64) is connected with the detector (7); when sulfur hexafluoride is detected, the first connecting port (61) is connected with the fourth connecting port (64). Compared with the prior art, the utility model has the advantages of detect the lower limit low, just discover the defect at the initial stage of leaking.
Description
Technical Field
The utility model belongs to the technical field of gaseous detection and specifically relates to a system for be used for examining inside leakage of sulfur hexafluoride in oil gas sleeve pipe is related to.
Background
The oil-Gas casing can realize the direct connection between oil-immersed electrical equipment and Gas-Insulated Metal-enclosed Switchgear (GIS), and is widely applied to converter stations, underground stations, power plants and the like. The oil gas casing is filled with sulfur hexafluoride gas with a certain pressure, the pressure is generally between 0.4 and 0.6MPa, and when the sulfur hexafluoride of the oil gas casing leaks internally, the SF gas leaks6Gas can escape into the oil-immersed electrical equipment through a leakage point of a sealing surface of the oil-gas sleeve and the oil-immersed electrical equipment and dissolve in insulating oil of the oil-immersed electrical equipment. The insulating oil also contains dissolved therein nitrogen, oxygen, methane, acetylene, ethylene, ethane, hydrogen, carbon monoxide, carbon dioxide, etc. However, current testing techniques have a detection limit that is too high to have the ability to detect defects at the beginning of a leak.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a system for checking the internal leakage of sulfur hexafluoride in the oil gas sleeve pipe, which has low detection lower limit and can find the defects at the initial leakage stage, in order to overcome the defects existing in the prior art.
The purpose of the utility model can be realized through the following technical scheme:
when the oil gas casing pipe is hexafluoroatedWhen sulfur leaks internally, SF6Gaseous probably is through the leak source of oil gas sleeve pipe and the sealed face of oily formula electrical equipment loss in to oily formula electrical equipment to dissolve in oily formula electrical equipment's insulating oil, the utility model discloses whether sulfur hexafluoride exists in the gas chromatograph judgement insulating oil to the simulation, whether the internal leakage takes place for the back-push sulfur hexafluoride, therefore provides following system.
A system for checking the internal leakage of sulfur hexafluoride in an oil-gas casing comprises a sample injection device, a four-way valve and a detector which are connected in sequence; the four-way valve comprises a first connecting port, a second connecting port and a fourth connecting port, the sample feeding device is connected with the first connecting port, the second connecting port is communicated with the outside, one end of the detector is connected with the fourth connecting port, and the other end of the detector is communicated with the outside; and when the sulfur hexafluoride is detected, the first connecting port is connected with the fourth connecting port. The separated SF is6The gas is sent to a detector for qualitative and quantitative analysis.
Further, the sample injection device comprises a carrier gas inlet; and one end of the carrier gas inlet is connected with the carrier gas storage tank, and the other end of the carrier gas inlet is connected with the four-way valve.
Further, a purifier is arranged between the carrier gas inlet and the first connecting port.
Further, the sample injection device comprises a sample injector; one end of the sample injector is connected with the four-way valve, and the other end of the sample injector is connected with an insulating oil storage tank of the oil-immersed electrical equipment.
Furthermore, a quantitative ring is arranged between the sample injector and the first connecting port.
Furthermore, a chromatographic column is arranged between the sample feeding device and the first connecting port.
Further, the chromatographic column comprises a propackQ column or a 5A molecular sieve column.
Further, the length of the chromatographic column is 4-6 m.
Further, the four-way valve also comprises a third connecting port; before and after detecting sulfur hexafluoride, the first connecting port is connected with the second connecting port; the third connecting port is connected with the fourth connecting port.
Before detection, gases such as hydrogen, oxygen, nitrogen and the like are separated out and evacuated; separating and evacuating other gases after detection, wherein only SF is used in the whole detection process6The gas enters the detector, and other high-content gas is exhausted without polluting the detector.
Further, the second connecting port is connected with the third connecting port when the sulfur hexafluoride is detected.
Further, the detector comprises a helium ionization detector or an electron capture detector.
Compared with the prior art, the utility model has the advantages of it is following:
(1) the utility model discloses a switching between each connector for only SF in the whole testing process6The gas enters the detector, and other high-content gas is exhausted without polluting the detector;
(2) the utility model discloses used the helium ionization detector that precision is higher or electron capture detector, be very strong in the detection capability aspect, the invention sets up technical links such as valve cutting separation time, carrier gas velocity through connecting suitable chromatogram separation system with the detector, can make it possess the ability that detects trace sulfur hexafluoride to can discover the inside leakage of sulfur hexafluoride early;
(3) the lower detection limit of the utility model can be as low as 0.1 muL/L, even lower, and is reduced by 50 times compared with the existing testing device, and the defect of the equipment can be determined at the initial stage of internal leakage;
(4) the utility model discloses entire system's structure is fairly simple, and the operation is simple and easy, can realize real-time continuous monitoring.
Drawings
FIG. 1 is a schematic view of an exemplary embodiment of a detection apparatus;
FIG. 2 is a graph of baseline noise during testing in an example;
FIG. 3 is SF in the example6Chromatogram peak images;
the reference numbers in the figures indicate: a carrier gas inlet 1, a purifier 2, a sample injector 3, a quantitative loop 4, a chromatographic column 5, a four-way valve 6, a first connecting port 61, a second connecting port 62, a third connecting port 63, a fourth connecting port 64, and a detector 7.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Examples
A system for checking the internal leakage of sulfur hexafluoride in an oil-gas casing, as shown in figure 1, comprises a sample injection device, a four-way valve 6 and a detector 7 which are connected in sequence; the four-way valve 6 comprises a first connecting port 61, a second connecting port 62, a third connecting port 63 and a fourth connecting port 64, the sampling device is connected with the first connecting port 61, the second connecting port 62 is communicated with the outside, one end of the detector 7 is connected with the fourth connecting port 64, and the other end of the detector is communicated with the outside; a chromatographic column 5 is also arranged between the sample injection device and the first connecting port 61, and the chromatographic column 5 is a propackQ column with the length of 4-6 m.
The sample introduction device comprises a carrier gas inlet 1; one end of the carrier gas inlet 1 is connected with the carrier gas storage tank, and the other end is connected with the four-way valve 6; a purifier 2 is also arranged between the carrier gas inlet 1 and the first connecting port 61; the sample injection device comprises a sample injector 3; one end of the sample injector 3 is connected with the four-way valve 6, and the other end of the sample injector is connected with an insulating oil storage tank of the oil-immersed electrical equipment; a quantitative ring 4 is also arranged between the sample injector 3 and the first connecting port 61.
Before detecting sulfur hexafluoride, the first connecting port 61 is connected with the second connecting port 62; the third connecting port 63 is connected with the fourth connecting port 64, and gases such as hydrogen, oxygen, nitrogen and the like which are separated firstly are evacuated;
when detecting sulfur hexafluoride, the second connection port 62 is connected to the third connection port 63, the first connection port 61 is connected to the fourth connection port 64, and the separated SF is separated6The gas is sent to a detector 7 for qualitative and quantitative analysis.
The to-be-detected insulating oil in the insulating oil storage tank of the oil-immersed electrical equipment enters the system through the sample injector 3.
The carrier gas is helium, and the flow rate is 40 mL/min;
valve switching time point: 2min, switching to the connection of the first connector 61 and the fourth connector 64 and the connection of the second connector 62 and the third connector 63, and 3min, switching to the connection of the first connector 61 and the second connector 62 and the connection of the third connector 63 and the fourth connector 64;
the column box temperature, i.e. the column temperature, is shown in Table 1
TABLE 1
| Serial number | Time of | Column temperature | |
| 1 | 0-5min | 60 |
|
| 2 | 5-12min | The temperature rise rate is 20 ℃/min at 150 |
|
| 3 | 12-18min | 60 ℃ and the speed reduction rate of 30 ℃/min |
The baseline noise can reach 3 muV, as shown in figure 2, the detection limit can reach 0.05ppb, and the device finds that SF is dissolved in certain insulating oil6And determining that the sulfur hexafluoride in the oil-gas casing pipe has internal leakage, wherein the detection result shows a chromatographic peak diagram, as shown in figure 3.
After detecting sulfur hexafluoride, the first connecting port 61 is connected with the second connecting port 62; the third connection port 63 is connected with the fourth connection port 64, and other high-content gas is exhausted without polluting the detector.
SF alone in the whole detection process6Gas entryAnd the detector 7 does not pollute the detector.
Claims (10)
1. A system for checking the internal leakage of sulfur hexafluoride in an oil-gas casing is characterized by comprising a sample injection device, a four-way valve (6) and a detector (7) which are sequentially connected; the four-way valve (6) comprises a first connecting port (61), a second connecting port (62) and a fourth connecting port (64), the sample feeding device is connected with the first connecting port (61), the second connecting port (62) is communicated with the outside, one end of the detector (7) is connected with the fourth connecting port (64), and the other end of the detector is communicated with the outside; when sulfur hexafluoride is detected, the first connecting port (61) is connected with the fourth connecting port (64).
2. A system for checking internal leakage of sulphur hexafluoride in an oil and gas jacket according to claim 1, wherein said sample introduction means includes a carrier gas inlet (1); one end of the carrier gas inlet (1) is connected with the carrier gas storage tank, and the other end of the carrier gas inlet is connected with the four-way valve (6).
3. A system for checking internal leakage of sulphur hexafluoride in an oil and gas casing according to claim 2, characterised in that a purifier (2) is also provided between the carrier gas inlet (1) and the first connection port (61).
4. A system for checking internal leakage of sulphur hexafluoride in an oil and gas casing according to claim 1, wherein said sample introduction means comprises a sample injector (3); one end of the sample injector (3) is connected with the four-way valve (6), and the other end of the sample injector is connected with an insulating oil storage tank of the oil-immersed electrical equipment.
5. The system for checking the internal leakage of sulfur hexafluoride in an oil and gas casing according to claim 4, characterized in that a dosing ring (4) is provided between the sample injector (3) and the first connection port (61).
6. The system for checking the internal leakage of sulfur hexafluoride in an oil and gas casing according to claim 1, wherein a chromatographic column (5) is further disposed between the sample injection device and the first connection port (61).
7. The system for checking internal leakage of sulfur hexafluoride in an oil and gas casing as claimed in claim 6, wherein the chromatographic column (5) comprises a propackQ column or a 5A molecular sieve column.
8. A system for checking internal leakage of sulphur hexafluoride in oil and gas casings as claimed in claim 6, wherein said chromatographic column (5) has a length of 4-6 m.
9. The system for checking internal leakage of sulfur hexafluoride in an oil and gas casing according to claim 1, wherein the four-way valve (6) further includes a third connection port (63); before and after sulfur hexafluoride detection, the first connecting port (61) is connected with the second connecting port (62); the third connection port (63) is connected to the fourth connection port (64).
10. The system for checking internal leakage of sulfur hexafluoride recited in claim 9, wherein the second connection port (62) and the third connection port (63) are connected when detecting sulfur hexafluoride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020894517.0U CN212513508U (en) | 2020-05-25 | 2020-05-25 | System for checking internal leakage of sulfur hexafluoride in oil-gas casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020894517.0U CN212513508U (en) | 2020-05-25 | 2020-05-25 | System for checking internal leakage of sulfur hexafluoride in oil-gas casing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212513508U true CN212513508U (en) | 2021-02-09 |
Family
ID=74392927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020894517.0U Active CN212513508U (en) | 2020-05-25 | 2020-05-25 | System for checking internal leakage of sulfur hexafluoride in oil-gas casing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212513508U (en) |
-
2020
- 2020-05-25 CN CN202020894517.0U patent/CN212513508U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103344735A (en) | Method for positioning discharging fault in gas insulated switchgear (GIS) | |
| CN106370746A (en) | Gas-dissolved-in-vegetable-insulating-oil analyzer with oil-gas separation function and detecting method | |
| CN111983394B (en) | SF-based 6 GIS discharge fault diagnosis method for analysis of decomposition products | |
| CN102967671B (en) | Device and method for detecting sulfur hexafluoride gas in oil immersed transformer | |
| CN110108813B (en) | Device and method for detecting mixed gas decomposition product of perfluoroisobutyronitrile and carbon dioxide | |
| CN201945580U (en) | Online analysis chromatograph for gas in insulating oil | |
| CN106124135B (en) | A kind of device and method sealing tiny leakage for detecting high-power transformer cannula tip | |
| CN212513508U (en) | System for checking internal leakage of sulfur hexafluoride in oil-gas casing | |
| CN210071754U (en) | Detection C4F7N and CO2Device for mixing decomposition products of gas | |
| CN206002261U (en) | A kind of device for detecting high-power transformer cannula tip sealing tiny leakage | |
| CN102253319B (en) | Solid insulation voltage resistance performance test system under high voltage and low temperature Paschen condition | |
| CN211955717U (en) | On-line monitoring device | |
| CN112698165B (en) | Converter transformer valve side sleeve fault detection device | |
| WO2021189623A1 (en) | On-line diagnosis method and apparatus for internal fault of sulfur hexafluoride electrical device | |
| CN114019040A (en) | System for detecting gas impurities in sulfur hexafluoride | |
| CN203465246U (en) | System for detecting performance of transformer oil chromatograph on-line monitoring device | |
| CN115791002A (en) | Detection method applied to leakage of environment-friendly insulating gas electrical equipment | |
| CN116558731A (en) | Air tightness detection device and method for GIS welding shell | |
| CN103196638A (en) | Closed composite apparatus rationing leakage detecting method | |
| CN207502451U (en) | A kind of multi-channel type gas analyzer | |
| CN102494849B (en) | Air tightness detecting device and implementation method for same | |
| CN103675206B (en) | System for detecting sulfur hexafluoride | |
| CN116047234A (en) | SF6N2 mixed gas decomposition test system and insulation defect diagnosis method | |
| CN109442225A (en) | The insulating gas on-line monitoring system and method for preventing signal piping leakage | |
| CN215727925U (en) | Analysis system for components of perfluoroisobutyronitrile carbon dioxide mixed gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |