CN101833060B - 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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- CN101833060B CN101833060B CN201010183922.2A CN201010183922A CN101833060B CN 101833060 B CN101833060 B CN 101833060B CN 201010183922 A CN201010183922 A CN 201010183922A CN 101833060 B CN101833060 B CN 101833060B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 19
- 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
- 238000000034 method Methods 0.000 claims description 35
- 238000005070 sampling Methods 0.000 claims description 9
- 229910018503 SF6 Inorganic materials 0.000 claims description 5
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 5
- 230000004807 localization Effects 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 238000010606 normalization Methods 0.000 claims description 2
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 2
- 238000009413 insulation Methods 0.000 description 12
- 238000001514 detection method Methods 0.000 description 10
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 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
- 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
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000002405 diagnostic procedure 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
- 238000012806 monitoring device Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 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 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, non-combustible, dielectric strength is high and arc extinguishing ability considerably beyond general dielectric feature.Therefore, SF
6gas insulated combined electrical equipment size is little, floor area is little, lightweight, without fire hazard, thereby greatly improved the reliability of electric system.SF
6the concept of traditional transformer station has been broken in the appearance of gas insulated transformer substation (GIS) and application, for the development of compact high voltage, the new-type transformer station of large capacity provides wide space.But, just because of the closure of gas insulated combined electrical equipment, cause having brought difficulty for the monitoring of GIS.Particularly, the defect producing because of insulation in 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 the major accidents such as GIS shell burns, blow-out disc action can cause a large amount of SF
6gas is overflowed, thus the air quality of severe contamination GIS outside.The GIS shell particularly causing due to internal arc fault burns, the SF escaping
6gas contains a large amount of gaseous state electric arc analytes, is also 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 solid insulation surface, and following period of time soon after often occurring in GIS and putting into operation, and when fault occurs, usually not generation systems operation, does not exist superpotential.Causing this class insulation fault is mainly some little insulation defects, as dirty in inner impurity, burr, loose contact and solid insulation surface etc.These defects are conventionally more small and hidden, be not enough to cause puncture immediately in the time of power frequency withstand test, but under normal working voltage effect, can there is shelf depreciation after putting into operation, make defect develop gradually expansion, the electric charge that can also make electric discharge produce accumulates gradually on solid insulation surface, causes Electric Field Distribution seriously to distort.Therefore, GIS is as the substantial equipment in electric system, and its state-detection is obviously very necessary.And shelf depreciation is one of important parameter of reflection GIS insulating property, it is sign and the form of expression of GIS insulation degradation, is again further deteriorated reason of insulation, so detect GIS local discharge signal and the location of shelf depreciation is had great importance.
In GIS, the monitoring method of shelf depreciation has substantially: 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 current comparative maturities.In recent years, the detection method for local discharge of many novelties more and more causes people's attention.The phase place gate pole control method that for example Japan Nagoya university proposes, the physical-chemical diagnostic method that Russian scientist proposes, the wavelet method for the monitoring of wideband electromagnetic ripple that Osaka, Japan university proposes, finite time-domain difference (FDTD) method that British 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 " a kind of local discharge of electrical equipment ultrahigh frequency locating and detecting device and the method " patent that is 200910104428.X, disclosed partial discharge positioning method is for directly asking for the mistiming from high sampling rate oscillograph, and then realizes shelf depreciation location." the online detection and location device of local discharge of gas-insulator switchgear and localization method " patent that and for example application number is 200610054229.9, disclosed shelf depreciation is also to utilize the mistiming of two detection signal rising edges to realize shelf depreciation location.Above-mentioned two kinds of methods are asked for the mistiming, and precision is not high, the impact being easily disturbed.
Summary of the invention
The object of the invention is the weak point for the localization method of existing GIS local discharge on-line monitoring device, provide a kind of and have that positioning precision is high, method of operating is simple and the on-line monitoring locating device of a kind of local discharge of gas-insulator switchgear of the feature such as calculated amount is little.
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 for the signal conditioning circuit of signal amplification and filtering also having,
Sensor: the antenna by each boxlike insulator place that is placed in SF6 gas insulated transformer substation forms;
Intelligent selection switch: be connected with each antenna of sensor, with gating antenna in turn, and be connected with described signal conditioning circuit by radioshielding concentric cable;
High-speed figure collector: its data acquisition channel is connected with the output terminal of signal conditioning circuit;
Processor: be connected with high-speed figure collector by bus, and be connected with intelligent selection switch by bus.
Above-mentioned intelligent selection switch is single pole multiple throw.
The online detection and location device of shelf depreciation of the present invention (hardware components) mainly by: sensor antenna (also can say the sensor being made up of antenna), intelligent selection switch, signal conditioning circuit, high-speed figure collector, processor and control module form.Sensor antenna of the present invention is arranged on the each disc insulator of GIS place, and each sensor antenna is connected with intelligent selection switch; After intelligent selection switch is connected with signal conditioning circuit by radioshielding concentric cable, be connected with the data acquisition channel of high-speed figure collector again, high-speed figure collector is connected with processor by bus, processor is connected with control module by bus, and control module is connected with intelligent selection switch by bus.
Compared with prior art, the invention has the beneficial effects as follows:
1, positioning precision is high, anti-interference good
Owing to adopting specific wave head fitting process, by data fitting, reflect the trend of original function overall variation like function by solving a simple road, through facts have proved, the method is effective, can determine exactly shelf depreciation source point.
2, method of operating is simple, calculated amount is little.
3, apparatus structure is simple, cost of manufacture is not high.
The present invention adopts after technique scheme, has effective detection GIS shelf depreciation, can improve the feature such as antijamming capability of detection system.
The features and advantages of the invention are further set forth in connection with embodiment.
Brief description of the drawings
Fig. 1 is theory diagram of the present invention;
Fig. 2 is the program flow diagram of the inventive method;
Fig. 3-1st, the sensor antenna of one embodiment of the present of invention local discharge signal oscillogram at the scene;
Fig. 3-2nd, the wave head portion waveshape figure of the shelf depreciation that the waveform of local discharge signal shown in Fig. 3-1 employing wave head fitting process draws.
Embodiment
In Fig. 1,1, sensor antenna (can select existing microstrip antenna); 2, intelligent 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 of implementing hardware of the present invention forms schematic diagram.System comprises the multiple sensors that form for detection of the antenna 1 of local discharge signal, intelligent selection switch 2, signal conditioning circuit 3, high-speed figure collector 4, processor 5 and the control module 6 that are arranged on GIS outside.
An on-line monitoring locating device for local discharge of gas-insulator switchgear, comprises for the signal conditioning circuit of signal amplification and filtering, also has,
Sensor: the antenna by each boxlike insulator place that is placed in SF6 gas insulated transformer substation forms;
Intelligent selection switch: be connected with each antenna of sensor, with gating antenna in turn, and be connected with described signal conditioning circuit by radioshielding concentric cable;
High-speed figure collector: its data acquisition channel is connected with the output terminal of signal conditioning circuit;
Processor: be connected with high-speed figure collector by bus, and be connected with intelligent selection switch by bus.
Fig. 2 is process flow diagram of the present invention.In the time that the inner generation of GIS shelf depreciation produces electric discharge steep-sided pulse signal, can excite the uhf electromagnetic wave producing more than 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 intelligent selection switches 2, adopt screened coaxial cable to make intelligent selection switch 2 be connected to antenna, signal conditioning circuit 3 carries out filtering, eliminates and disturb and noise signal detection signal, high-speed figure collector 4 becomes signal after digital signal, then carries out calculation process by processor 5.
Fig. 3-1, Fig. 3-2 are respectively the typical Partial Discharge that detects at the scene of the sensor antenna of one embodiment of the invention and the wave head part drawing with wave head fitting process thereof, as can be seen from the figure local discharge signal clearly, its signal amplitude is approximately 4.9mV, the needs that can meet Partial Discharge Detection, have higher sensitivity.The waveform drawing from wave head fitting process, this matching waveform can characterize actual Partial Discharge generally, simultaneously also obtains Partial Discharge Sources and arrive the distance of this antenna from algorithm.
Intelligent selection switch of the present invention is 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 intelligent selection switch, the signal collecting is after signal conditioning circuit, by high-speed figure collector (being analog to digital converter), signal is converted to digital signal, processor is analyzed and is processed 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 applicable approximate function reflects original function overall variation trend that solves.A host of facts prove, matched curve method is a kind of effective method.
Waveform to a large amount of shelf depreciations is furtherd investigate, and can show that the wave head part of Partial Discharge can be described by double-exponential function.Suppose that local discharge of gas-insulator switchgear signal is u (t), defining the zero hour of discharging was zero moment, and the wave head partial function form of u (t) is:
A, s in formula
1, s
2for undetermined parameter.
If the local discharge signal that sensor detects is u
1(t), the wave head partial function form of this signal is:
In formula
t
1for local discharge signal is from shelf depreciation source point to this sensor time used.
Local discharge signal u
1(t) through being sampled as burst u
1(n), find out u
1(n) maximal value, is then normalized.
N is sampled signal u
1(n) sampling number, (u
1(n))
maxfor burst u
1(n) maximal value.
Then find out after normalization
the sampled point of sampled point amplitude between 0.3～0.9, intercepts
one section.
Then by intercept
matched curve, obtains parameter b, c, s
1, s
2; Because
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), Partial Discharge Sources coordinate is (x, y, z), local discharge signal is at SF
6velocity of propagation in 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), be respectively t with the time that wave head fitting process draws
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)
By (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 being formed by antenna), intelligent 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, the position in rectangular coordinate system in space is stored in processor by each antenna sensor, and set timing acquisition time interval;
(2) sampling local discharge signal: the sampling time, then first processor by total line traffic control intelligent selection switch antenna in gating sensor in turn, was then sent to data in processor;
(3) shelf depreciation judgement: according to the amplitude of signal, taking the noise signal amplitude without shelf depreciation of the Test Field measured in advance as criterion, judge whether to occur shelf depreciation;
(4) digital: accurately determine the mistiming of the local discharge signal of any three sensor measurements according to wave head fitting algorithm of the present invention, according to the sulfur hexafluoride (SF of GIS
6) electromagnetic wave propagation speed in medium, can calculate the particular location of Partial Discharge Sources;
(5) show: when occurring when shelf depreciation, position and by judgment result displays at processor screen; In the time not there is shelf depreciation, get back to (2) step and wait for timing sampling local discharge signal next time.
Claims (1)
1. an on-line monitoring localization method for local discharge of gas-insulator switchgear, adopts with lower device:
For the signal conditioning circuit of signal amplification and filtering;
Sensor: the antenna by each boxlike insulator place that is placed in SF6 gas insulated transformer substation forms;
Intelligent selection switch: be connected with each antenna of sensor, with gating antenna in turn, and be connected with described signal conditioning circuit by radioshielding concentric cable;
High-speed figure collector: its data acquisition channel is connected with the output terminal of signal conditioning circuit;
Processor: be connected with high-speed figure collector by bus, and be connected with intelligent selection switch by bus;
It is characterized in that, step is as follows:
(1) initialization: at three dimensions, the position in rectangular coordinate system in space is stored in processor by each antenna sensor, and set timing acquisition time interval;
(2) sampling local discharge signal: the sampling time, then first processor by total line traffic control intelligent selection switch antenna in gating sensor in turn, was then sent to data in processor;
(3) shelf depreciation judgement: according to the amplitude of signal, taking the noise signal amplitude without shelf depreciation of the Test Field measured in advance as criterion, judge whether to occur shelf depreciation;
(4) digital: accurately determine the mistiming of the local discharge signal of any three sensor measurements according to wave head fitting algorithm, according to the sulfur hexafluoride (SF of GIS
6) electromagnetic wave propagation speed in medium, can calculate the particular location of Partial Discharge Sources;
(5) show: when occurring when shelf depreciation, position and by judgment result displays at processor screen; In the time not there is shelf depreciation, get back to (2) step and wait for timing sampling local discharge signal next time;
Described wave head fitting algorithm is as follows:
Suppose that local discharge of gas-insulator switchgear signal is u (t), defining the zero hour of discharging was zero moment, and the wave head partial function form of u (t) is:
A, s in formula
1, s
2for undetermined parameter;
If the local discharge signal that sensor detects is u
1(t), the wave head partial function form of this signal is:
In formula
t
1for local discharge signal is from shelf depreciation source point to this sensor time used;
Local discharge signal u
1(t) through being sampled as burst u
1(n), find out u
1(n) maximal value, is then normalized;
N is sampled signal u
1(n) sampling number, (u
1(n))
maxfor burst u
1(n) maximal value;
Then find out after normalization
the sampled point of sampled point amplitude between 0.3～0.9, intercepts
one section;
Then by intercept
matched curve, obtains parameter b, c, s
1, s
2; Because
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), Partial Discharge Sources coordinate is (x, y, z), local discharge signal is at SF
6velocity of propagation in 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), so 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)
By (1), (2), (3) three equations simultaneousnesses, just can obtain the position (X, Y, Z) of Partial Discharge Sources.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010183922.2A CN101833060B (en) | 2010-05-26 | 2010-05-26 | Positioning device for monitoring partial discharge of gas-insulater switchgear on line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
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| CN101833060A CN101833060A (en) | 2010-09-15 |
| CN101833060B true CN101833060B (en) | 2014-09-10 |
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| CN201010183922.2A Active CN101833060B (en) | 2010-05-26 | 2010-05-26 | Positioning device for monitoring partial discharge of gas-insulater switchgear on line |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102540021B (en) * | 2010-12-20 | 2015-08-05 | 上海市电力公司 | High frequency office is placed on the method for wire system monitoring GIS |
| WO2014091926A1 (en) * | 2012-12-12 | 2014-06-19 | 三菱電機株式会社 | Vacuum deterioration monitoring apparatus |
| 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 |
| 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 |
| 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 |
| CN112462214B (en) * | 2020-11-26 | 2023-01-20 | 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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| US6433557B1 (en) * | 2000-12-21 | 2002-08-13 | Eaton Corporation | Electrical system with capacitance tap and sensor for on-line monitoring the state of high-voltage insulation and remote monitoring device |
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