CN204405588U - A kind of bushing shell for transformer SF 6gas micro water content on-line measuring device - Google Patents
A kind of bushing shell for transformer SF 6gas micro water content on-line measuring device Download PDFInfo
- Publication number
- CN204405588U CN204405588U CN201520126134.8U CN201520126134U CN204405588U CN 204405588 U CN204405588 U CN 204405588U CN 201520126134 U CN201520126134 U CN 201520126134U CN 204405588 U CN204405588 U CN 204405588U
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- CN
- China
- Prior art keywords
- water content
- transformer
- micro water
- measuring device
- battery lead
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- 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.)
- Expired - Fee Related
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 238000009413 insulation Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims description 9
- 241000218202 Coptis Species 0.000 claims description 4
- 235000002991 Coptis groenlandica Nutrition 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003319 supportive effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Abstract
The utility model relates to a kind of bushing shell for transformer SF
6gas micro water content on-line measuring device, comprise capacitance type sensor and connected data acquisition modulate circuit, described capacitance type sensor comprise by insulation column carry out isolate support just to arrange electric pole plate and lower electrode plate, golden film has been crossed in electric pole plate and lower electrode plate opposite flank, and the golden film of upper and lower battery lead plate is crimped with upper and lower battery lead plate extension line respectively; Described data acquisition modulate circuit comprises the detection amplifying circuit, A/D converter, single-chip microcomputer and the display that connect successively.The utility model, based on the data acquisition modulate circuit of microcomputer development, can detect uF-nF level capacitance variations, this structure of the detecting device is simple, cost is low, highly sensitive, can real-time online detection thimble SF
6gas micro water content, has highly application value.
Description
Technical field
The utility model relates to a kind of gas micro water content on-line measuring device, is specifically related to a kind of bushing shell for transformer SF
6gas micro water content on-line measuring device.
Background technology
Bushing shell for transformer is the primary insulation device of transformer outside, for lead-in wire is caused fuel tank outside, to ensure the insulation gone between over the ground, plays anchor leg simultaneously.At present, extra-high voltage direct-current transmission engineering current conversion station is used ± 400kV and above valve side DC bushing many employings SF6 gas insulated bushing, in actual use, owing to existing, bobbin seal is not tight, sleeve pipe evacuation process is not good, gas filling technology is bad and SF
6the reasons such as new gas is second-rate, SF in sleeve pipe
6part steam can be had in gas.In sleeve pipe charging operation, moisture can with SF
6the decomposition product generation hydrolysis reaction of gas, produce objectionable impurities, heavy corrosion built-in electrical insulation, affects arc extinguishing; Meanwhile, steam condenses at device interior, also can cause creeping discharge (flashover), destroys insulation, accidents caused.
At present conventional micro-water detector can only offline inspection, and complex operation, wastes time and energy, cannot moisture content in real time in detection thimble charge process.Correspondingly, also cannot understand in real time the insulating property of sleeve pipe, be unfavorable for transformer safety stable operation.
Summary of the invention
For the problems referred to above, the utility model provide a kind of easy for installation, reliability is strong, highly sensitive, bushing shell for transformer SF can be detected in real time based on capacitance type sensor
6the on-line measuring device of gas micro water content.
For solving the problem, the technical scheme that the utility model is taked is: a kind of bushing shell for transformer SF
6gas micro water content on-line measuring device, comprise capacitance type sensor and connected data acquisition modulate circuit, described capacitance type sensor comprise by insulation column carry out isolate support just to arrange electric pole plate and lower electrode plate, golden film has been crossed in electric pole plate and lower electrode plate opposite flank, and the golden film of upper and lower battery lead plate is crimped with upper and lower battery lead plate extension line respectively; Described data acquisition modulate circuit comprises the detection amplifying circuit, A/D converter, single-chip microcomputer and the display that connect successively.
Described insulation column is made up of high-purity, single crystal silicon, to be symmetrically distributed between upper and lower battery lead plate and the justified margin of the edge of insulation column and upper and lower battery lead plate.
Described top electrode, lower electrode plate are made up of high-purity, single crystal silicon.
Described upper and lower battery lead plate extension line adopts gold thread.
SF
6gas can produce SF when arc discharge
2, S
2f
2, S
2f
10, SF
8with HF and subfluoride such as grade, portion gas meets water can form smog, has severe corrosive to plain metal electrode.For this reason, the utility model spy adopts the stronger monocrystalline silicon of resistance to corrosion as electrode holder, and silicon chip inner surface be coated with a layer thickness evenly, the golden film of stable chemical performance is as electrode, utilize special process to be crimped on by gold thread as battery lead plate extension line on golden film, improve the reliability of sensor further.The insulation column that high-purity, single crystal silicon is formed plays a supportive role to battery lead plate, and insulation column edge will overlap with electrode edge as far as possible, amasss with the right opposite increasing the upper and lower battery lead plate of sensor, improves the sensitivity of capacitance type sensor.
The utility model adopts the data acquisition modulate circuit based on microcomputer development, realizes sensor signal and exports and teletransmission.Data acquisition modulate circuit based on microcomputer development can detect the change of uF-nF level electric capacity, and highly sensitive, antijamming capability is strong.
Described detection amplifying circuit adopts pulse width modulation circuit, comprises the first comparer, the second comparer, trigger flip-flop, capacitor charge and discharge loop and low-pass filter.
This circuit utilizes the charge-discharge principle of sensor capacitance that the dutycycle of circuit output pulse is changed with the electric capacitance change of capacitive transducer, obtains by low-pass filter the direct current signal corresponding to measured change.This circuit has linear convergent rate, can obtain the advantages such as direct current output without the need to detuner.
The utility model, based on the principle of capacitive transducer, utilizes the golden film that high-purity, single crystal silicon is plated to be electrode, according to steam and SF
6the difference of gas relative dielectric constant, constitutes and can be used for detecting SF
6the high sensitivity novel capacitance-type sensor of gas micro water content.Meanwhile, can be used for the data acquisition modulate circuit that Detection capacitance formula sensor exports based on microcomputer development, make real-time online detection thimble SF
6gas micro water content becomes possibility.
SF of the present utility model
6gas micro water content on-line measuring device, adopt miromaching to realize, structure is simple, and reliable and stable, cost is lower, highly sensitive, and antijamming capability is strong, is applicable to apply.
Accompanying drawing explanation
Fig. 1 is capacitive sensor structure schematic diagram;
Fig. 2 is capacitance type sensor front view;
Fig. 3 is data acquisition modulate circuit schematic diagram;
Fig. 4 is for detecting amplifying circuit schematic diagram; HF
Wherein, 1, electric pole plate, 2, lower electrode plate, 3, golden film, 4, insulation column, 5, electric pole plate extension line, 6, lower electrode plate extension line, the first comparer A
1, the second comparer A
2, capacitance type sensor Cx.
Embodiment
As shown in Figure 1 and Figure 2, a kind of bushing shell for transformer SF
6gas micro water content on-line measuring device, comprise capacitance type sensor and connected data acquisition modulate circuit, described capacitance type sensor comprise by insulation column 4 carry out isolate support just to arrange electric pole plate 1 and lower electrode plate 2, described upper and lower battery lead plate is made by high-purity, single crystal silicon and golden film 3 has been crossed in both opposite flanks, and the golden film 3 of upper and lower battery lead plate is crimped with gold thread respectively as electric pole plate extension line 5 and lower electrode plate extension line 6; Described insulation column 4 is made up of high-purity, single crystal silicon, to be symmetrically distributed between upper and lower battery lead plate and the justified margin of the edge of insulation column 4 and upper and lower battery lead plate.
As shown in Figure 3, Figure 4, described data acquisition modulate circuit comprises the detection amplifying circuit, A/D converter, single-chip microcomputer and the display that connect successively.Wherein, detect amplifying circuit and adopt pulse width modulation circuit, comprise the first comparer A
1, the second comparer A
2, trigger flip-flop, capacitor charge and discharge loop and low-pass filter.This circuit utilizes the charge-discharge principle of sensor capacitance that the dutycycle of circuit output pulse is changed with the electric capacitance change of capacitive transducer, obtains by low-pass filter the direct current signal corresponding to measured change.Wherein, Cx is capacitance type sensor.This circuit has linear convergent rate, can obtain the feature of direct current output without the need to detuner.Data acquisition modulate circuit widely uses, does not repeat them here.
According to the principle of capacitance type sensor, when being pure SF in sleeve pipe
6during gas (under 101.325kPa, 25 DEG C of conditions, ε
sF6=1.002049), to survey capacitance be ε
sF6s/D (S: upper and lower pole plate right opposite amasss, D: the vertical range of upper bottom crown); Correspondingly, and when being steam entirely in sleeve pipe (under 101.325kPa, 25 DEG C of conditions, ε
h2O=1.00785), to survey capacitance be ε
h2Os/D.Work as S=0.01m
2, during D=0.1m, pure SF
6the capacitance of gas and pure water vapour is respectively 100204.9uF, 100785uF, and capacitance difference reaches 580.1uF.If actual institute surveys capacitance when [100204.9,100785] uF interval, SF can be judged
6the steam of some is had in gas.The output signal of surveyed capacitance after data acquisition modulate circuit and database are carried out contrast convert, can SF be drawn
6micro-water content in gas.
Relative to traditional micro-water content method of testing, the utility model bushing shell for transformer SF
6gas micro water content on-line measuring device directly can be installed on sleeve pipe and get air valve place, and structure is simple, convenient and swift, highly sensitive, can be used for real-time online and detects, be specially adapted to current extra-high voltage direct-current transmission engineering SF used
6the micro-water detection experiment of DC bushing.
Claims (5)
1. a bushing shell for transformer SF
6gas micro water content on-line measuring device, it is characterized in that: comprise capacitance type sensor and connected data acquisition modulate circuit, described capacitance type sensor comprise by insulation column carry out isolate support just to arrange electric pole plate and lower electrode plate, golden film has been crossed in electric pole plate and lower electrode plate opposite flank, and the golden film of upper and lower battery lead plate is crimped with upper and lower battery lead plate extension line respectively; Described data acquisition modulate circuit comprises the detection amplifying circuit, A/D converter, single-chip microcomputer and the display that connect successively.
2. bushing shell for transformer SF according to claim 1
6gas micro water content on-line measuring device, is characterized in that: described insulation column is made up of high-purity, single crystal silicon, to be symmetrically distributed between upper and lower battery lead plate and the justified margin of the edge of insulation column and upper and lower battery lead plate.
3. bushing shell for transformer SF according to claim 1
6gas micro water content on-line measuring device, is characterized in that: described electric pole plate, lower electrode plate are made up of high-purity, single crystal silicon.
4. bushing shell for transformer SF according to claim 1
6gas micro water content on-line measuring device, is characterized in that: described upper and lower battery lead plate extension line adopts gold thread.
5. bushing shell for transformer SF according to claim 1
6gas micro water content on-line measuring device, is characterized in that: described detection amplifying circuit adopts pulse width modulation circuit, comprises the first comparer, the second comparer, trigger flip-flop, capacitor charge and discharge loop and low-pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520126134.8U CN204405588U (en) | 2015-03-04 | 2015-03-04 | A kind of bushing shell for transformer SF 6gas micro water content on-line measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520126134.8U CN204405588U (en) | 2015-03-04 | 2015-03-04 | A kind of bushing shell for transformer SF 6gas micro water content on-line measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204405588U true CN204405588U (en) | 2015-06-17 |
Family
ID=53429438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520126134.8U Expired - Fee Related CN204405588U (en) | 2015-03-04 | 2015-03-04 | A kind of bushing shell for transformer SF 6gas micro water content on-line measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204405588U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104713919A (en) * | 2015-03-04 | 2015-06-17 | 山东电力设备有限公司 | On-line detection device for micro-water content of SF6 gas in transformer bushing |
-
2015
- 2015-03-04 CN CN201520126134.8U patent/CN204405588U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104713919A (en) * | 2015-03-04 | 2015-06-17 | 山东电力设备有限公司 | On-line detection device for micro-water content of SF6 gas in transformer bushing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150617 |