CN203981829U - Local discharge detection device in a kind of high-tension switch cabinet - Google Patents
Local discharge detection device in a kind of high-tension switch cabinet Download PDFInfo
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- CN203981829U CN203981829U CN201420442122.1U CN201420442122U CN203981829U CN 203981829 U CN203981829 U CN 203981829U CN 201420442122 U CN201420442122 U CN 201420442122U CN 203981829 U CN203981829 U CN 203981829U
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- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000003909 pattern recognition Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 241000276425 Xiphophorus maculatus Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- 238000004064 recycling Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The utility model discloses local discharge detection device in a kind of high-tension switch cabinet, comprise multiple contactless uhf sensors, it has the circuit board that a sheet arranges, on described circuit board, be provided with the symmetrical antenna plane for receiving local discharge signal, and the envelope detection circuit being connected with described antenna plane, generate the ultra-high frequency signal enveloping curve that shelf depreciation produces.In the utility model high-tension switch cabinet, local discharge detection device can be arranged in outdoor high-voltage switch cabinet, by receiving the uhf electromagnetic wave that in cabinet, shelf depreciation produces, realize Partial Discharge Detection and pattern-recognition, and can in the situation that not having a power failure, install equipment, and status of equipment is carried out to real-time dynamic monitoring, there is extremely strong antijamming capability and higher sensitivity.
Description
Technical field
The utility model relates to electrical equipment online supervision technology, in more specific words it, the utility model relates generally to local discharge detection device in a kind of high-tension switch cabinet.
Background technology
High-tension switch cabinet is the very important electrical equipment of electric system, and the defect of its built-in electrical insulation part or the loose contact deteriorated, conductive connection part divides all make safe operation be on the hazard.According to National Power System 6～10kV switch cubicle accident statistics between 1989～1992 years, it is total 40.2% that the fault that insulation and current-carrying cause accounts for, and the accident wherein causing due to the flashover of insulated part accounts for 79.0% of insulation fault sum.Owing to may producing electric discharge phenomena latent period in accident, therefore can be by the monitoring of electric discharge is obtained to relevant information.And current local discharge on-line monitoring device is applied in transformer station, rarely seen application in ring main unit out of doors.These devices all cannot be installed in the situation that equipment does not have a power failure simultaneously.
Utility model content
Local discharge detection device in the utility model patented technology can be arranged in outdoor high-voltage switch cabinet, by receiving the uhf electromagnetic wave that in cabinet, shelf depreciation produces, realize Partial Discharge Detection and pattern-recognition, and can in the situation that not having a power failure, install equipment, and status of equipment is carried out to real-time dynamic monitoring, there is extremely strong antijamming capability and higher sensitivity.
Therefore, design local discharge detection device in a kind of high-tension switch cabinet, comprise contactless uhf sensor, it has a circuit board, on described circuit board, be provided with the antenna arrangement plane for receiving local discharge signal, in order to make antenna miniaturization, circuit board is set to platy structure or circular configuration conventionally; And the envelope detection circuit being connected with described antenna plane, generate the ultra-high frequency signal enveloping curve of shelf depreciation generation to a signal processor march line analysis and extraction property value.
In one embodiment, described envelope detection circuit comprises: first signal converting member, connects described antenna plane and be to represent the ac signal of Characteristics of Partial Discharge by the local discharge signal energy conversion receiving; Secondary signal converting member, connects described first signal converting member and described ac signal is converted to analog pulse signal; Signal detecting part, connects described secondary signal converting member, for extracting analog sine wave signal wherein and extracting signal peak and phase propetry value.
In one embodiment, described first signal converting member is radio frequency sending set, and described secondary signal converting member is radio-frequency transmitter.Or described first signal converting member is coded optical signal transmitter, described secondary signal converting member is light signal receiver decoder.
In one embodiment, described circuit board has the capacitance of 50～200pF.
In one embodiment, the local discharge signal bandwidth frequency that described antenna plane detects is 500～1500MHz.
In one embodiment, described signal amplifier is embedded in Bezier type active band-pass filter, and its gain amplifier is 40dB.
The utility model has designed a kind of new method of Partial Discharge Detection, applied in as the detection of GIS, synchronous motor, transformer, cable etc. at power equipment, antenna has the advantages that external interference signal is few, its electrical property and frequency size are irrelevant, there is the advantages such as broadband, circular polarisation, size be little, thereby detection system affected by external interference little, can greatly improve local discharge of electrical equipment and detect, particularly online reliability and the sensitivity detecting.Have obvious advantage for high-tension switch cabinet on-line monitoring, therefore this technology is for example obtaining experience in 400kV transformer station.By having collected more than 10,000 contained the database of the high-tension apparatus of all different models, to device in high-voltage switch cabinet body (as CT, PT), bus junction, support insulator surface and breaking device, such as fuse, the switch of operating a switch etc. have carried out verification experimental verification.
Know-why of the present utility model is that discharge electricity amount is first gathered in the grounded metal part adjacent with point of discharge according in the time of high voltage electric equipment generation shelf depreciation, forms current impulse and propagates to all directions.For internal discharge, discharge electricity amount is gathered in earth-shielded inside surface, therefore, cannot discharge signal be detected in outside if screen layer is consecutive hours.But in fact, screen layer causes discontinuous conventionally in position appearance breakages such as insulation position, packing ring junction, cable insulation terminals, and like this, high-frequency signal will be transferred to equipment skin.The electromagnetic wave of discharge generation blazes abroad by the seam crossing of metal cabinet or the liner of gas-insulated switch.
In one embodiment, high-tension switch cabinet shelf depreciation online measuring technique switching devices shelf depreciation situation detects and locates, and surveys on the metal shell of tested looped network cabinet equipment by manifold type sensor detector.Device detects the of short duration potential pulse causing due to shelf depreciation, measures the amplitude peak of shelf depreciation potential pulse.Adopt multiple manifold type detectors can detect the poor position of determining discharge activities of electromagnetic wave momentary pulse institute elapsed time that point of discharge sends, principle is to adopt relatively electromagnetic pulse to arrive respectively the needed time of sensor detector.Which passage is system indicate be first triggered, so show detector from the electrical distance of point of discharge close to.Pulse is with the light velocity or approach the light velocity and propagate, so must can differentiate the very little mistiming, is generally μ s level.The time difference that adopts comparison electromagnetic pulse to arrive at different detectors determines that the method for point of discharge is better than adopting comparison signal intensity to determine the method for point of discharge in itself, because electromagnetic multiple reflections may cause amplitude measurement result undesired.
Based on this, the technique effect of the utility model embodiment is apparent, the high-tension switch cabinet local discharge detection device adopting has the advantages such as the bandwidth, antijamming capability of measurement is strong, good operating stability, can meet well the requirement of partial discharge of switchgear on-line monitoring; Device is embedded Archimedes's both arms helical antennas in uhf sensor, have broadband, circular polarisation, size is little, efficiency is high and the advantage such as non-cpntact measurement, can realize and installing under high-tension switch cabinet does not have a power failure duty; Adopt detecting circuit to obtain the enveloping curve of the ultra-high frequency signal of shelf depreciation generation, recycling data processing unit extracts signal peak and phase characteristic amount.This mode greatly reduces the data volume of data processing and collection, effectively reduces the complexity of device itself and the requirement to communication bandwidth, Surveillance center's processing power thereof.
Brief description of the drawings
Fig. 1 schematically shows the function modoularization block diagram of the utility model local discharge detection device;
Embodiment
With reference to Fig. 1, local discharge detection device in high-tension switch cabinet, comprise contactless uhf sensor, it has a circuit board 11 in the form of sheets, on described circuit board, be provided with the symmetrically arranged antenna plane 12 of one-tenth for receiving local discharge signal, and the envelope detection circuit 2 being connected with described antenna plane 12, generate the ultra-high frequency signal enveloping curve that shelf depreciation produces.Envelope detection circuit 2 comprises: first signal converting member 21, connects described antenna plane and be to represent the ac signal of Characteristics of Partial Discharge by the local discharge signal energy conversion receiving; Secondary signal converting member 22, connects described first signal converting member and described ac signal is converted to analog pulse signal; Signal detecting part 23, connects described secondary signal converting member, for extracting analog sine wave signal wherein and extracting signal peak and phase propetry value.
In one embodiment, described first signal converting member 21 is radio frequency sending set, and described secondary signal converting member 22 is radio-frequency transmitter.
In one embodiment, described circuit board 11 has the capacitance of 50～200pF.
In one embodiment, the local discharge signal bandwidth frequency that described antenna plane detects is 500～1500MHz.
In one embodiment, described signal amplifier is embedded in Bezier type active band-pass filter, and its gain amplifier is 40dB.
Claims (6)
1. local discharge detection device in a high-tension switch cabinet, it is characterized in that comprising multiple contactless uhf sensors, it has the circuit board that a sheet arranges, on described circuit board, be provided with the symmetrical antenna plane for receiving local discharge signal, and the envelope detection circuit being connected with described antenna plane, generate the ultra-high frequency signal enveloping curve that shelf depreciation produces.
2. local discharge detection device in high-tension switch cabinet according to claim 1, is characterized in that:
Described envelope detection circuit comprises: first signal converting member, connects described antenna plane and be to represent the ac signal of Characteristics of Partial Discharge by the local discharge signal energy conversion receiving; Secondary signal converting member, connects described first signal converting member and described ac signal is converted to analog pulse signal; Signal detecting part, connects described secondary signal converting member, for extracting analog sine wave signal wherein and extracting signal peak and phase propetry value.
3. local discharge detection device in high-tension switch cabinet according to claim 2, is characterized in that:
Described first signal converting member is radio frequency sending set, and described secondary signal converting member is radio-frequency transmitter.
4. local discharge detection device in high-tension switch cabinet according to claim 1, is characterized in that:
Described circuit board has the capacitance of 50～200pF.
5. local discharge detection device in high-tension switch cabinet according to claim 2, is characterized in that:
The local discharge signal bandwidth frequency that described antenna plane detects is 500～1500MHz.
6. local discharge detection device in high-tension switch cabinet according to claim 1, is characterized in that:
Described signal amplifier is embedded in Bezier type active band-pass filter, and its gain amplifier is 40dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420442122.1U CN203981829U (en) | 2014-08-06 | 2014-08-06 | Local discharge detection device in a kind of high-tension switch cabinet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420442122.1U CN203981829U (en) | 2014-08-06 | 2014-08-06 | Local discharge detection device in a kind of high-tension switch cabinet |
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| CN203981829U true CN203981829U (en) | 2014-12-03 |
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| CN201420442122.1U Active CN203981829U (en) | 2014-08-06 | 2014-08-06 | Local discharge detection device in a kind of high-tension switch cabinet |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166076A (en) * | 2014-08-06 | 2014-11-26 | 国家电网公司 | Partial discharge detecting device in high-voltage switch cabinet |
| CN104655914A (en) * | 2015-02-04 | 2015-05-27 | 广州供电局有限公司 | Method and device for detecting interference signals and local discharging signals of GIS equipment |
| CN105425129A (en) * | 2015-12-25 | 2016-03-23 | 国网陕西省电力公司西安供电公司 | Portable device used for partial discharge online monitoring of high-voltage switch cabinet |
| CN108061844A (en) * | 2017-12-12 | 2018-05-22 | 太仓鼎诚电子科技有限公司 | A kind of high-tension switch cabinet shelf depreciation UHE online monitoring systems |
-
2014
- 2014-08-06 CN CN201420442122.1U patent/CN203981829U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166076A (en) * | 2014-08-06 | 2014-11-26 | 国家电网公司 | Partial discharge detecting device in high-voltage switch cabinet |
| CN104655914A (en) * | 2015-02-04 | 2015-05-27 | 广州供电局有限公司 | Method and device for detecting interference signals and local discharging signals of GIS equipment |
| CN105425129A (en) * | 2015-12-25 | 2016-03-23 | 国网陕西省电力公司西安供电公司 | Portable device used for partial discharge online monitoring of high-voltage switch cabinet |
| CN105425129B (en) * | 2015-12-25 | 2018-11-09 | 国网陕西省电力公司西安供电公司 | A kind of portable unit of partial discharge monitoring for high-tension switch cabinet |
| CN108061844A (en) * | 2017-12-12 | 2018-05-22 | 太仓鼎诚电子科技有限公司 | A kind of high-tension switch cabinet shelf depreciation UHE online monitoring systems |
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