CN101833060A - Positioning device for monitoring partial discharge of gas-insulater switchgear on line - Google Patents
Positioning device for monitoring partial discharge of gas-insulater switchgear on line Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
- 230000003750 conditioning effect Effects 0.000 claims abstract description 20
- 239000012212 insulator Substances 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 33
- 238000009413 insulation Methods 0.000 description 12
- 238000001514 detection method Methods 0.000 description 10
- 238000005070 sampling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 229910018503 SF6 Inorganic materials 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000004807 localization Effects 0.000 description 3
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention relates to a positioning device for monitoring the partial discharge of a gas-insulater switchgear on line. The positioning device comprises a signal conditioning circuit for amplifying signals and filtering and is characterized by also comprising a sensor, an intelligent select switch, a high-speed data acquisition unit and a processor, wherein the sensor consists of antennae at various box-type insulators which are arranged an SF6 gas insulated substation; the intelligent select switch is connected with various antennae of the sensor to gate antennae in turn and connected with the signal conditioning circuit through a high-frequency screened coaxial cable; the data acquisition channel of the high-speed data acquisition unit is connected with the output end of the signal conditioning circuit; and the processor is connected with the high-speed data acquisition unit and the intelligent select switch through a bus. The device has the characteristics of high positioning accuracy and anti-interference.
Description
Technical field
The invention belongs to the insulation of electrical installation monitoring positioning device, particularly SF
6Gas insulated transformer substation partial discharge monitoring and source of leakage location device.
Background technology
SF
6Gas is a kind of good insulating medium and arc-extinguishing medium, it have nontoxic, not flammable, dielectric strength is high and the arc extinguishing ability considerably beyond general dielectric characteristics.Therefore, SF
6The gas insulated combined electrical equipment size is little, floor area is little, in light weight, no fire hazard, thereby has greatly improved the reliability of electric system.SF
6The appearance of gas insulated transformer substation (GIS) and use and to have broken the notion of traditional transformer station is for the development of compact high voltage, the new-type transformer station of high capacity provides wide space.Yet,, cause having brought difficulty for the monitoring of GIS just because of the closure of gas insulated combined electrical equipment.Particularly, the defective that is produced because of insulation among the GIS can cause shelf depreciation (PD) under the effect of highfield, and the shelf depreciation sustainable development meeting of GIS inside causes insulation breakdown, the stability of crisis electric system and security.In addition, because major accidents such as the GIS shell burns, blow-out disc action can cause a large amount of SF
6Gas is overflowed, thus severe contamination GIS air outside quality.Particularly because the GIS shell that the internal arc fault causes burns the SF that escapes
6Gas contains a large amount of gaseous state electric arc analytes, also is accompanied by the injection of solid metallic fluoride dust simultaneously.
In all kinds of faults of GIS, insulation fault occupies larger proportion.Practical operation situation shows: insulation breakdown mostly occurs on the solid insulation surface, and soon following period of time after often occurring in GIS and putting into operation, and there was not superpotential in usually not generation systems operation when fault took place.Causing this class insulation fault mainly is some little insulation defects, dirty etc. as inner impurity, burr, loose contact and solid insulation surface.These defectives are more small and hidden usually, be not enough to cause when power frequency withstand test, puncture immediately, but shelf depreciation can take place in the back of putting into operation under normal working voltage effect, make defective develop expansion gradually, the electric charge that discharge is produced accumulates gradually on the solid insulation surface, causes Electric Field Distribution seriously to distort.Therefore, GIS is as the substantial equipment in the electric system, and its state-detection obviously is very necessary.And shelf depreciation is one of important parameter of reflection GIS insulating property, and it is the sign and the form of expression of GIS insulation degradation, is again the reason of the further deterioration of insulation, so detect the GIS local discharge signal and the location of shelf depreciation is had great importance.
Among the GIS there be substantially the partial discharge monitoring method: coupling capacitance method, ultrahigh frequency method, monitoring ultrasonic method, chemical monitoring method, optical monitoring method.Ultrahigh frequency method, monitoring ultrasonic method are the partial discharge monitoring methods of two kinds of present comparative maturities.In recent years, the detection method for local discharge of many novelties more and more causes people's attention.For example the phase place gate pole control method that proposes of Japan Nagoya university, the physical-chemical diagnostic method that Russian scientist proposes, the wavelet method that is used for the monitoring of wideband electromagnetic ripple that Osaka, Japan university proposes, finite time-domain difference (FDTD) method that the Britain scientist proposes.
The main research work of on-line monitoring localization method of existing local discharge of gas-insulator switchgear concentrates in the development of sensor.As application number is " a kind of local discharge of electrical equipment ultrahigh frequency locating and detecting device and method " patent of 200910104428.X, disclosed partial discharge positioning method is for directly asking for the mistiming from the high sampling rate oscillograph, and then realizes the shelf depreciation location.And for example application number is " online detection and location device of local discharge of gas-insulator switchgear and localization method " patent of 200610054229.9, and disclosed shelf depreciation also is to utilize the mistiming of two detection signal rising edges to realize the shelf depreciation location.Above-mentioned two kinds of methods are asked for the mistiming, and precision is not high, the influence that is subject to disturb.
Summary of the invention
The objective of the invention is weak point, a kind of on-line monitoring locating device that bearing accuracy height, method of operating simply reach a kind of local discharge of gas-insulator switchgear of characteristics such as calculated amount is little that has is provided at the localization method of existing GIS local discharge on-line monitoring device.
The object of the present invention is achieved like this: a kind of on-line monitoring locating device of local discharge of gas-insulator switchgear, comprise the signal conditioning circuit that is used for signal amplification and filtering, and also have,
Sensor: the antenna by each boxlike insulator place that is placed in the SF6 gas insulated transformer substation is formed;
Intelligence Selection switch: be connected with each antenna of sensor,, and be connected with described signal conditioning circuit by the radioshielding concentric cable with gating antenna in turn;
The high-speed figure collector: its data acquisition channel is connected with the output terminal of signal conditioning circuit;
Processor: be connected with the high-speed figure collector by bus, and be connected with the Intelligence Selection switch by bus.
Above-mentioned Intelligence Selection switch is a single pole multiple throw.
The online detection and location device of shelf depreciation of the present invention (hardware components) mainly by: sensor antenna (the also sensor that can say so and be made up of antenna), Intelligence Selection switch, signal conditioning circuit, high-speed figure collector, processor and control module are formed.Sensor antenna of the present invention is installed in each disc insulator place of GIS, and each sensor antenna is connected with the Intelligence Selection switch; After the Intelligence Selection switch passes through the radioshielding concentric cable and signal conditioning circuit is connected, data acquisition channel with the high-speed figure collector is connected again, the high-speed figure collector is connected with processor by bus, processor is connected with control module by bus, and control module is connected with the Intelligence Selection switch by bus.
Compared with prior art, the invention has the beneficial effects as follows:
1, bearing accuracy height, anti-interference are good
Owing to adopt specific wave head fitting process, by data fitting, reflect the trend of original function overall variation like function by finding the solution a simple road, through facts have proved that this method is effective, can determine the shelf depreciation source point exactly.
2, method of operating is simple, calculated amount is little.
3, apparatus structure is simple, cost of manufacture is not high.
After the present invention adopts technique scheme, have effective detection GIS shelf depreciation, can improve the characteristics such as antijamming capability of detection system.
Characteristics of the present invention and advantage will further be set forth in conjunction with embodiment.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is the program flow diagram of the inventive method;
Fig. 3-the 1st, the sensor antenna of one embodiment of the present of invention local discharge signal oscillogram at the scene;
Fig. 3-the 2nd, the wave head portion waveshape figure of the shelf depreciation that the employing of local discharge signal waveform shown in Fig. 3-1 wave head fitting process draws.
Embodiment
Among Fig. 1,1, sensor antenna (can select existing microstrip antenna for use); 2, Intelligence Selection switch (radio-frequency (RF) switch, talent board single pole multiple throw CH2); 3, signal conditioning circuit; 4, high-speed figure collector (Tyke TDS5104B oscillograph, the highest employing speed is 5GS/s, record length can reach 16m, the bandwidth of 1GHz); 5, processor (AT89C2051 single-chip microcomputer); 6, control module.
Fig. 1 is that the system that implements hardware of the present invention constitutes synoptic diagram.System comprises that be arranged on the GIS outside a plurality of are used to detect sensor, Intelligence Selection switch 2, signal conditioning circuit 3, high-speed figure collector 4, processor 5 and control module 6 that the antenna 1 of local discharge signal constitutes.
A kind of on-line monitoring locating device of local discharge of gas-insulator switchgear comprises the signal conditioning circuit that is used for signal amplification and filtering, also has,
Sensor: the antenna by each boxlike insulator place that is placed in the SF6 gas insulated transformer substation is formed;
Intelligence Selection switch: be connected with each antenna of sensor,, and be connected with described signal conditioning circuit by the radioshielding concentric cable with gating antenna in turn;
The high-speed figure collector: its data acquisition channel is connected with the output terminal of signal conditioning circuit;
Processor: be connected with the high-speed figure collector by bus, and be connected with the Intelligence Selection switch by bus.
Fig. 2 is a process flow diagram of the present invention.When the inner generation of GIS shelf depreciation produces discharge steep-sided pulse signal, can excite to produce the above uhf electromagnetic wave of hundreds of megahertz.GIS exterior antenna 1 receives the electromagnetic wave of local discharge generation, processor 5 sends instruction and makes control module 6 gating Intelligence Selection switches 2, adopt screened coaxial cable to make Intelligence Selection switch 2 be connected to antenna, 3 pairs of detection signals of signal conditioning circuit carry out filtering, eliminate and disturb and noise signal, after high-speed figure collector 4 becomes signal into digital signal, carry out calculation process by processor 5 again.
Fig. 3-1, Fig. 3-2 is respectively the typical shelf depreciation waveform that detects at the scene of the sensor antenna of one embodiment of the invention and the wave head part that draws with the wave head fitting process thereof, as can be seen from the figure local discharge signal clearly, its signal amplitude is approximately 4.9mV, can satisfy the needs of Partial Discharge Detection, have higher sensitivity.From the waveform that the wave head fitting process draws, this match waveform can characterize actual shelf depreciation waveform generally, also obtains the distance that Partial Discharge Sources arrives this antenna from algorithm simultaneously.
Intelligence Selection switch of the present invention is a single pole multiple throw, by the corresponding antenna of control module control backgating.Signal conditioning circuit comprises amplifying circuit and filter segment.High-speed figure collector of the present invention, processor and control module are market and purchase part.Processor sends instructions to control module by bus, choose sensor collection by control module control Intelligence Selection switch, the signal that collects is behind signal conditioning circuit, is digital signal by high-speed figure collector (being analog to digital converter) with conversion of signals, processor is analyzed and is handled the digital signal of high-speed figure collector collection, thereby GIS inside Partial Discharge Sources is positioned.
Data fitting is a kind of method that a simple approximate function that is suitable for reflects original function overall variation trend of finding the solution.A host of facts prove that the matched curve method is a kind of efficient ways.
Waveform to a large amount of shelf depreciations is furtherd investigate, and the wave head part that can draw the shelf depreciation waveform can be described by double-exponential function.Suppose that the local discharge of gas-insulator switchgear signal is u (t), defining the zero hour of discharging was zero moment, and then the wave head partial function form of u (t) is:
A, s in the formula
1, s
2Be undetermined parameter.
If sensor to local discharge signal be u
1(t), then the wave head partial function form of this signal is:
In the formula
t
1For local discharge signal from the shelf depreciation source point to the used time of this sensor.
Local discharge signal u
1(t) through being sampled as burst u
1(n), find out u
1(n) maximal value is carried out normalization then.
N is sampled signal u
1(n) sampling number, (u
1(n))
MaxBe burst u
1(n) maximal value.
Find out then after the normalization
The sampled point of sampled point amplitude between 0.3～0.9, i.e. intercepting
One section.
To intercept then
Parameter b, c, s are obtained in matched curve
1, s
2Because
Thereby obtain:
Determine true origin, set up the three-dimensional cartesian coordinate system in space.The volume coordinate of supposing this sensor is (x
1, y
1, z
1), the Partial Discharge Sources coordinate is that (z), local discharge signal is at SF for x, y
6Velocity of propagation in the gas is v, so have:
(x-x
1)
2+(y-y
1)
2+(z-z
1)
2＝(vt
1)
2 (1)
In like manner, the volume coordinate of supposing two other sensor is respectively (x
2, y
2, z
2), (x
3, y
3, z
3), the time that draws with the wave head fitting process is respectively t
2, t
3So, draw following two equations:
(x-x
2)
2+(y-y
2)
2+(z-z
2)
2＝(vt
2)
2 (2)
(x-x
3)
2+(y-y
3)
2+(z-z
3)
2＝(vt
3)
2 (3)
With (1), (2), (3) three equations simultaneousnesses, just can obtain the position (X, Y, Z) of Partial Discharge Sources.
A kind of local discharge of gas-insulator switchgear on-line monitoring locating device, this device utilizes sensor antenna (to can be described as, the sensor of forming by antenna), Intelligence Selection switch, signal conditioning circuit, high-speed figure collector, processor and control module, position by processor, its method step is as follows:
(1) initialization: at three dimensions, promptly the location storage in rectangular coordinate system in space and is set timing acquisition time at interval in processor with each antenna sensor;
(2) sampling local discharge signal: the sampling time, then processor at first took turns antenna in the gating sensor by total line traffic control Intelligence Selection switch, then data is sent in the processor;
(3) shelf depreciation is judged: according to the amplitude of signal, be criterion with the noise signal amplitude of the no shelf depreciation at the detection scene measured in advance, judge whether to take place shelf depreciation;
(4) mistiming location: according to the accurate mistiming of determining the local discharge signal of any three sensor measurements of wave head fitting algorithm of the present invention, according to the sulfur hexafluoride (SF of GIS
6) electromagnetic wave propagation speed in the medium, can calculate the particular location of Partial Discharge Sources;
(5) show: when shelf depreciation takes place when, position and with judgment result displays at the processor screen; When shelf depreciation not taking place, got back to for (2) step and wait for timing sampling local discharge signal next time.
Claims (2)
1. the on-line monitoring locating device of a local discharge of gas-insulator switchgear comprises, is used for the signal conditioning circuit of signal amplification and filtering, it is characterized in that: also have,
Sensor: the antenna by each boxlike insulator place that is placed in the SF6 gas insulated transformer substation is formed;
Intelligence Selection switch: be connected with each antenna of sensor,, and be connected with described signal conditioning circuit by the radioshielding concentric cable with gating antenna in turn;
The high-speed figure collector: its data acquisition channel is connected with the output terminal of signal conditioning circuit;
Processor: be connected with the high-speed figure collector by bus, and be connected with the Intelligence Selection switch by bus.
2. according to the on-line monitoring locating device of the described a kind of local discharge of gas-insulator switchgear of claim 1, it is characterized in that: described Intelligence Selection switch is a single pole multiple throw.
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| CN201010183922.2A CN101833060B (en) | 2010-05-26 | 2010-05-26 | Positioning device for monitoring partial discharge of gas-insulater switchgear on line |
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| CN201010183922.2A CN101833060B (en) | 2010-05-26 | 2010-05-26 | Positioning device for monitoring partial discharge of gas-insulater switchgear on line |
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Cited By (7)
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| CN102540021A (en) * | 2010-12-20 | 2012-07-04 | 上海市电力公司 | Method for monitoring GIS (gas insulated switchgear) by aid of high-frequency partial discharge online system |
| CN104569764A (en) * | 2015-01-06 | 2015-04-29 | 国家电网公司 | Live detection system for creeping discharge of composite apparatus and method thereof |
| CN104854676A (en) * | 2012-12-12 | 2015-08-19 | 三菱电机株式会社 | Vacuum deterioration monitoring apparatus |
| CN105676082A (en) * | 2016-01-19 | 2016-06-15 | 华北电力大学（保定） | Internal defect detection system and method for basin-type insulator of gas insulated switchgear (GIS) |
| CN106324461A (en) * | 2016-11-23 | 2017-01-11 | 国网四川省电力公司成都供电公司 | GIS alternate AC voltage withstand test insulation monitoring system and method |
| CN112462214A (en) * | 2020-11-26 | 2021-03-09 | 云南电网有限责任公司电力科学研究院 | Intelligent sensing terminal for partial discharge |
| CN112578233A (en) * | 2019-09-30 | 2021-03-30 | 中国石油化工股份有限公司 | Protection device of partial discharge detector |
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Cited By (11)
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| CN102540021A (en) * | 2010-12-20 | 2012-07-04 | 上海市电力公司 | Method for monitoring GIS (gas insulated switchgear) by aid of high-frequency partial discharge online system |
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| CN104854676A (en) * | 2012-12-12 | 2015-08-19 | 三菱电机株式会社 | Vacuum deterioration monitoring apparatus |
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| CN104569764A (en) * | 2015-01-06 | 2015-04-29 | 国家电网公司 | Live detection system for creeping discharge of composite apparatus and method thereof |
| CN105676082A (en) * | 2016-01-19 | 2016-06-15 | 华北电力大学（保定） | Internal defect detection system and method for basin-type insulator of gas insulated switchgear (GIS) |
| CN105676082B (en) * | 2016-01-19 | 2018-06-05 | 华北电力大学（保定） | Gas insulated combined electrical equipment disc insulator Inner Defect Testing system and method |
| CN106324461A (en) * | 2016-11-23 | 2017-01-11 | 国网四川省电力公司成都供电公司 | GIS alternate AC voltage withstand test insulation monitoring system and method |
| CN106324461B (en) * | 2016-11-23 | 2019-05-21 | 国网四川省电力公司成都供电公司 | A kind of interval GIS ac voltage withstanding tests type insulation monitoring system and monitoring method |
| CN112578233A (en) * | 2019-09-30 | 2021-03-30 | 中国石油化工股份有限公司 | Protection device of partial discharge detector |
| CN112462214A (en) * | 2020-11-26 | 2021-03-09 | 云南电网有限责任公司电力科学研究院 | Intelligent sensing terminal for partial discharge |
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| CN101833060B (en) | 2014-09-10 |
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