CN104713919A - On-line detection device for micro-water content of SF6 gas in transformer bushing - Google Patents
On-line detection device for micro-water content of SF6 gas in transformer bushing Download PDFInfo
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- CN104713919A CN104713919A CN201510095667.9A CN201510095667A CN104713919A CN 104713919 A CN104713919 A CN 104713919A CN 201510095667 A CN201510095667 A CN 201510095667A CN 104713919 A CN104713919 A CN 104713919A
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- electrode plate
- water content
- transformer
- gas
- lower electrode
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Abstract
The invention relates to an on-line detection device for the micro-water content of SF6 gas in a transformer bushing. The on-line detection device comprises a capacitive transducer and a data acquisition conditioning circuit connected with the capacitive transducer, wherein the capacitive transducer comprises an upper electrode plate and a lower electrode plate, which are supported in an isolation manner through insulating support columns and arranged oppositely; gold films are plated on opposite side surfaces of the upper electrode plate and the lower electrode plate; the gold films of the upper electrode plate and the lower electrode plate are in crimp connection with an upper electrode plate outgoing line and a lower electrode plate outgoing line respectively; the data acquisition conditioning circuit comprises a detection amplifying circuit, an A/D converter, a single chip microcomputer and a displayer, which are connected sequentially. The data acquisition conditioning circuit developed on the basis of the single chip microcomputer can be used for detecting uF-nF level capacitance change, and the detection device is simple in structure, low in cost, high in sensitivity, can be used for detecting the micro-water content of the SF6 gas in the bushing in real time and has higher popularization and application values.
Description
Technical field
The present invention relates to a kind of gas micro water content on-line measuring device, be 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 invention provides 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 present invention takes 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 present invention 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 present invention 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 present invention is based on the principle of capacitive transducer, utilize 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 invention
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, bushing shell for transformer SF of the present invention
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 |
|---|---|---|---|
| CN201510095667.9A CN104713919A (en) | 2015-03-04 | 2015-03-04 | On-line detection device for micro-water content of SF6 gas in transformer bushing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510095667.9A CN104713919A (en) | 2015-03-04 | 2015-03-04 | On-line detection device for micro-water content of SF6 gas in transformer bushing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104713919A true CN104713919A (en) | 2015-06-17 |
Family
ID=53413432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510095667.9A Pending CN104713919A (en) | 2015-03-04 | 2015-03-04 | On-line detection device for micro-water content of SF6 gas in transformer bushing |
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Citations (8)
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|---|---|---|---|---|
| CN201034619Y (en) * | 2007-01-25 | 2008-03-12 | 深圳市特安电子有限公司 | Universal differential pickup signal isolation converting device |
| EP2026062A1 (en) * | 2007-08-17 | 2009-02-18 | Omicron electronics GmbH | Method and device for determining the humidity content in the insulator of a transformer |
| CN201854255U (en) * | 2010-11-10 | 2011-06-01 | 吴苏杭 | Differential pulse width modulation circuit |
| CN102175755A (en) * | 2011-02-16 | 2011-09-07 | 西安交通大学 | Carbon nanotube film micro-nano ionizing sensor and manufacture method thereof |
| EP2746758A1 (en) * | 2012-12-19 | 2014-06-25 | Omicron electronics GmbH | Method and device for determining moisture content and for drying an insulation |
| CN203949894U (en) * | 2014-04-01 | 2014-11-19 | 淮安科达电气有限公司 | A kind of SF 6micro-water gaging instrument |
| CN104374421A (en) * | 2013-08-16 | 2015-02-25 | 深圳市深安旭传感技术有限公司 | Transducer for measuring tiny water in oil and method for on-line real-time monitoring of temperature and humidity in oil |
| CN204405588U (en) * | 2015-03-04 | 2015-06-17 | 山东电力设备有限公司 | A kind of bushing shell for transformer SF 6gas micro water content on-line measuring device |
-
2015
- 2015-03-04 CN CN201510095667.9A patent/CN104713919A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201034619Y (en) * | 2007-01-25 | 2008-03-12 | 深圳市特安电子有限公司 | Universal differential pickup signal isolation converting device |
| EP2026062A1 (en) * | 2007-08-17 | 2009-02-18 | Omicron electronics GmbH | Method and device for determining the humidity content in the insulator of a transformer |
| CN201854255U (en) * | 2010-11-10 | 2011-06-01 | 吴苏杭 | Differential pulse width modulation circuit |
| CN102175755A (en) * | 2011-02-16 | 2011-09-07 | 西安交通大学 | Carbon nanotube film micro-nano ionizing sensor and manufacture method thereof |
| EP2746758A1 (en) * | 2012-12-19 | 2014-06-25 | Omicron electronics GmbH | Method and device for determining moisture content and for drying an insulation |
| CN104374421A (en) * | 2013-08-16 | 2015-02-25 | 深圳市深安旭传感技术有限公司 | Transducer for measuring tiny water in oil and method for on-line real-time monitoring of temperature and humidity in oil |
| CN203949894U (en) * | 2014-04-01 | 2014-11-19 | 淮安科达电气有限公司 | A kind of SF 6micro-water gaging instrument |
| CN204405588U (en) * | 2015-03-04 | 2015-06-17 | 山东电力设备有限公司 | A kind of bushing shell for transformer SF 6gas micro water content on-line measuring device |
Non-Patent Citations (2)
| Title |
|---|
| 胡晓光 等: "SF_6断路器在线绝缘监测方法研究", 《电力自动化设备》 * |
| 荆锴 等: "SF_6气体微水在线检测装置研究", 《山东电力技术》 * |
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Application publication date: 20150617 |