CN104166076A - Partial discharge detecting device in high-voltage switch cabinet - Google Patents
Partial discharge detecting device in high-voltage switch cabinet Download PDFInfo
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- CN104166076A CN104166076A CN201410384328.8A CN201410384328A CN104166076A CN 104166076 A CN104166076 A CN 104166076A CN 201410384328 A CN201410384328 A CN 201410384328A CN 104166076 A CN104166076 A CN 104166076A
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Abstract
The invention discloses a partial discharge detecting device in a high-voltage switch cabinet. The partial discharge detecting device comprises a plurality of non-contact super-high frequency sensors. The partial discharge detecting device is provided with a slice-shaped circuit board, and the circuit board is provided with symmetrical antenna planes used for receiving partial discharge signals, an envelope detection circuit connected with the antenna planes, and super-high frequency signal envelope curves for generating partial discharge. The partial discharge detecting device can be installed in the outdoor high-voltage switch cabinet, and partial discharge detecting and mode recognizing are achieved by receiving super-high frequency electromagnet waves produced through partial discharge in a cabinet body; the partial discharge detecting device can be installed under the situation that power supplied to the device is not stopped, real-time dynamic monitoring can be carried out on the device condition, and the partial discharge detecting device has very high antijamming capability and high sensitivity.
Description
Technical field
The present invention relates to electrical equipment online supervision technology, in more specific words it, the present invention 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 defect or the loose contact deteriorated, conductive connection part divides of its built-in electrical insulation part 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.
Summary of the invention
Local discharge detection device in patented technology of the present invention 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 for receiving the antenna arrangement plane of 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 the ac signal for expression 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 present invention has designed a kind of new method of Partial Discharge Detection, at power equipment, applied in as the detection of GIS, synchronous motor, transformer, cable etc., 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.For high-tension switch cabinet on-line monitoring, have obvious advantage, so this technology is for example obtaining experience in 400kV transformer station.By more than 10,000 database of containing the high-tension apparatus of all different models of having collected, 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., carried out verification experimental verification.
Know-why of the present invention is that discharge electricity amount is first gathered in the grounded metal part adjacent with point of discharge according to when 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, if screen layer is consecutive hours, discharge signal cannot externally be detected.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 by manifold type sensor detector, on the metal shell of tested looped network cabinet equipment, surveys.Device detects the of short duration potential pulse causing due to shelf depreciation, measures the amplitude peak of shelf depreciation potential pulse.Adopt a plurality of 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 embodiment of the present invention is apparent, the high-tension switch cabinet local discharge detection device adopting has the advantages such as the bandwidth of measurement, antijamming capability are 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 complexity and the requirement to communication bandwidth, Surveillance center's processing power thereof of device itself.
Accompanying drawing explanation
Fig. 1 schematically shows the function modoularization block diagram of local discharge detection device of the present invention;
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 for receiving the symmetrically arranged antenna plane 12 of one-tenth of 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 the ac signal for expression 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 a plurality of contactless uhf sensors, it has the circuit board that a sheet arranges, on described circuit board, be provided with for receiving the symmetrical antenna plane of 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, it is characterized in that: described envelope detection circuit comprises: first signal converting member, connects described antenna plane and the ac signal for expression 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 |
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| CN201410384328.8A CN104166076A (en) | 2014-08-06 | 2014-08-06 | Partial discharge detecting device in high-voltage switch cabinet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410384328.8A CN104166076A (en) | 2014-08-06 | 2014-08-06 | Partial discharge detecting device in high-voltage switch cabinet |
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| CN104166076A true CN104166076A (en) | 2014-11-26 |
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| CN201410384328.8A Pending CN104166076A (en) | 2014-08-06 | 2014-08-06 | Partial discharge detecting device in high-voltage switch cabinet |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107102242A (en) * | 2017-04-06 | 2017-08-29 | 北京电无忧科技有限公司 | High-tension switch cabinet insulation state monitoring method and system |
| 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 |
| CN110554291A (en) * | 2018-05-31 | 2019-12-10 | 广东电网有限责任公司 | Partial discharge signal envelope detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107102242A (en) * | 2017-04-06 | 2017-08-29 | 北京电无忧科技有限公司 | High-tension switch cabinet insulation state monitoring method and system |
| 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 |
| CN110554291A (en) * | 2018-05-31 | 2019-12-10 | 广东电网有限责任公司 | Partial discharge signal envelope detection device |
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