CN201281745Y - Detection device for internal local discharge of gas insulated combined electrical equipment - Google Patents
Detection device for internal local discharge of gas insulated combined electrical equipment Download PDFInfo
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- CN201281745Y CN201281745Y CNU2008201235019U CN200820123501U CN201281745Y CN 201281745 Y CN201281745 Y CN 201281745Y CN U2008201235019 U CNU2008201235019 U CN U2008201235019U CN 200820123501 U CN200820123501 U CN 200820123501U CN 201281745 Y CN201281745 Y CN 201281745Y
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Abstract
The utility model relates to the technical field of high voltage insulation detection, in particular to an internal partial-discharge detection device of a gas-insulation combined electrical apparatus. In order to solve the problems that environmental signals and undesired signals cannot be filtered effectively during the detection process, the utility model provides the internal partial-discharge detection device of the gas-insulation combined electrical apparatus, which comprises a shading ring arranged outside a GIS basin-type insulation subring and a detecting window arranged on the shading ring, and also comprises an antenna group and a detecting element; the antenna group at least comprises a first antenna element and a second antenna element; and the detecting element comprises a signal arithmetic-circuit. The internal partial-discharge detection device can correctly monitor early various partial-discharges inside the GIS when equipment operates; in addition, misjudgment and missing judgment cannot be caused; and for a whole online detection system, the whole cost of the equipment is lowered greatly, and the post-treatment of the system becomes extremely simple and effective.
Description
Technical field
The utility model relates to the technical field that High-Voltage Insulation detects, and is specifically related to a kind of interior partial discharge detection device for gas insulation composite apparatus.
Background technology
Characteristics such as gas insulated combined electrical equipment (GIS) is little owing to floor area, operational reliability height are used more and more widely.Though the GIS reliability is than higher, the probability of malfunction that operation own may occur is lower, in case break down, its destructiveness also is very big, and the loss that accident causes is very big.
Internal fault is more common and be difficult to predict in all kinds of faults of GIS, and internal fault is mainly produced by insulation breakdown.The early stage insulation fault principal mode of GIS is a shelf depreciation, but because GIS structurally is totally enclosed characteristics, directly detect its failure symptom that may occur internally and realize trouble technically, and must be on production link, directly some sensor or other pick-up units to be installed in GIS inside in GIS producer, these pick-up units itself just may be one of reasons that causes fault sometimes, and therefore greatly part producer and GIS user generally do not wish to adopt built-in online detection mode both at home and abroad.
Also there is not at present directly to detect the method that the GIS built-in electrical insulation destroys, what generally adopt is Indirect Detecting Method, optical detection is generally arranged, the chemical constitution detection method, ultrasonic monitoring method and UHF Partial Discharge Detection method, but it is several or be not suitable for the not high reason of validity of GIS equipment on-line monitoring or monitoring owing to the front, have only ultrasonic Detection Method feasible and relative effective with UHF Partial Discharge Detection method, ultrasonic Detection Method is destroyed invalid to some GIS built-in electrical insulations or early stage slight office is put and can't detect in these two kinds of methods, therefore generally in the industry at present approvedly judges that to detecting relatively effectively way has only UHF Partial Discharge Detection method.
The ultimate principle of UHF Partial Discharge Detection method is, as putting then its signal, existence office has the ultrahigh frequency flash-over characteristic and its frequency band very wide (generally between the 300MHz-3000MHz) because GIS is inner, and because GIS is good wave conductor, therefore local discharge superhigh frequency signal (UHF) can be propagated therein, and by GIS insulation basin and flanged seam place to external leakage, make its inner local discharge signal of external detection become possibility thus.
Its basic use-pattern of external antenna UHF Partial Discharge Detection method is for to be placed on antenna on the GIS disc insulator ring, detect the inner office of GIS put send and by conducted inside through the disc insulator slit to the UHF of external leaks signal, judge the partial discharges fault that GIS inside may occur by the signal spectrum feature of its leakage.Existing various external antenna detection pattern all is by various difformities, the antenna of structure and performance obtains GIS office discharge signal, but since the UHF office discharge signal of GIS itself generation itself a little less than, need antenna to possess higher sensitivity and bigger gain, when higher and gain amplifier is big when the sensitivity of antenna, the ambient signal of GIS periphery and various undesired signal also are exaggerated detected, system is the powerful electromagnetic interference signals of surrounding enviroment by the pickup electrode major part that the detection antenna obtains, and useful GIS office discharge signal just seems very little very weak, the existing patent of detection is put in GIS office for all and technological achievement all is round the technology of above-mentioned detected signal being carried out subsequent treatment, on the ways and means, wherein promptly comprise and undertaken by hardware that signal filtering handles, also comprise by software and carry out Filtering Processing, but its processing cost that causes thus is very high, and its treatment effect is also undesirable.
The utility model content
In order to solve the problem that prior art can not effectively be filtered ambient signal and undesired signal in testing process, the utility model provides a kind of interior partial discharge detection device for gas insulation composite apparatus, handles output effective internal office by the modulate circuit in it and puts detection signal.
In order to achieve the above object, the technical solution adopted in the utility model is:
A kind of interior partial discharge detection device for gas insulation composite apparatus comprises being arranged on the outer shading ring of GIS disc insulator ring that shading ring is provided with detection window, it is characterized in that: also comprise antenna sets and detecting unit; Described antenna sets comprises first antenna element and second antenna element at least, the GIS that first antenna element is used for receiving described detection window is by disc insulator leakage office's discharge signal and environmental interference signal, and second antenna element is used for receiving the environmental interference signal of described detection window; Described detecting unit comprises signal computing circuit, is used for eliminating the influence of environmental interference signal in the GIS leakage signal that receives, and obtains GIS office discharge signal.
The receive direction of above-mentioned first antenna element is relative with described detection window, and the receive direction of described second antenna element is relative with described shielding ring seal place, is provided with insulation gap between described first antenna element and second antenna element.
Insulation gap between above-mentioned first antenna element and second antenna element is 1 to 3 centimetre.
Above-mentioned antenna sets has the shielding outer cover, and the lower openings of shielding outer cover covers the detection window on the described shading ring, and the shape of lower openings and the outside of shading ring are complementary.
Above-mentioned first antenna element has identical receiving ability with second antenna element to same sensed signal sources.
Above-mentioned signal computing circuit is the signal subtraction computing circuit, deducts the composition of environmental interference signal in the GIS leakage signal, obtains GIS office discharge signal.
Above-mentioned detecting unit also comprises first signal amplification circuit and secondary signal amplifying circuit, export signal computing circuit to after the GIS leakage signal that comprises the environmental interference signal that first signal amplification circuit receives first antenna element is amplified, export signal computing circuit to after the environmental interference signal that the secondary signal amplifying circuit receives second antenna element amplifies; First signal amplification circuit has identical amplifying power with the secondary signal amplifying circuit to same signal.
Above-mentioned detecting unit also comprises signal threshold value filtering circuit and signal output modulate circuit, the signal threshold value filtering circuit is used for the GIS office discharge signal of signal computing circuit output is carried out threshold filter, and the signal condition output circuit is used for the GIS office discharge signal of signal threshold value filtering circuit output is carried out the adjustment of amplitude and/or output impedance.
Above-mentioned signal computing circuit, signal threshold value filtering circuit and signal output modulate circuit are formed signal processing unit, and mutual electromagnetic shielding between the first antenna detection unit, the second antenna detection unit, connect by signal wire and power lead.
It can be good by Partial Discharge Detection that the threshold value of above-mentioned signal threshold value filtering circuit makes on the GIS pick-up unit its inner office amplify in office's discharge signal of 5PC.
Compared with prior art, the beneficial effect of the utility model generation is as follows:
Target of the present utility model is exactly correctly to monitor the inner early stage all kinds of shelf depreciations of GIS under the equipment operation situation.That device is installed is fairly simple, the debugging rule is unified and can check, and plays a game with putting and detects in full force and effect and can not cause erroneous judgement, fail to judge, and concerning whole on-line detecting system, the equipment integral cost reduces greatly, makes system's subsequent treatment become simple effective simultaneously.Accuracy of detection and sensitivity are controlled by different antennae type, structure choice fully, can select various different structures, different gains, different standing-wave ratio (SWR) combination of antennas to make the device detection sensitivity higher more effective.
Description of drawings
Fig. 1 is installed in the outer structural representation of GIS disc insulator ring for the utility model;
Fig. 2 is the structural representation of shading ring in the utility model;
Fig. 3 is the utility model antenna sets centre section structural representation;
Fig. 4 is the amplification of the utility model signal, computing, filtering and modulate circuit block diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the technical solution of the utility model is done detailed description.
Referring to Fig. 1, Fig. 2 and Fig. 3, the utility model provides a kind of interior partial discharge detection device for gas insulation composite apparatus, comprises being arranged on the outer shading ring 1 of GIS insulation subring, and shading ring is provided with detection window 2, also comprises antenna sets and detecting unit 5; Described antenna sets comprises that first antenna element 3 and second antenna element, 4, the first antenna elements 3 are used for receiving the GIS leakage signal and the environmental interference signal of detection window 2, and second antenna element 4 is used for receiving the environmental interference signal of detection window 2; The receive direction of first antenna element 3 is relative with detection window 2, and the receive direction of second antenna element 4 is relative with sealing place of shading ring 1, is provided with insulation gap between first antenna element 3 and second antenna element 4, and insulation gap is 1 to 3 centimetre.Above-mentioned antenna sets has the shielding outer cover, and the lower openings of shielding outer cover covers the detection window 2 on the shading ring 1, and the outside of the shape of lower openings and shading ring 1 is complementary.4 pairs of same signal sources of above-mentioned first antenna element 3 and second antenna element have identical receiving ability.
Referring to Fig. 4, the detecting unit 5 of interior partial discharge detection device for gas insulation composite apparatus comprises first signal amplification circuit 6, secondary signal amplifying circuit 7, signal computing circuit 8, signal threshold value filtering circuit 9 and signal output modulate circuit 10.
Export signal computing circuit 8 to after the GIS leakage signal that comprises the environmental interference signal that first signal amplification circuit 6 receives first antenna element 3 is amplified, export signal computing circuit 8 to after the environmental interference signal that secondary signal amplifying circuit 7 receives second antenna element 4 amplifies; 7 pairs of same signals of first signal amplification circuit 6 and secondary signal amplifying circuit have identical amplifying power.
Signal threshold value filtering circuit 9 is used for the GIS office discharge signal of signal computing circuit output is carried out threshold filter, and it can be good by Partial Discharge Detection that the threshold value of signal threshold value filtering circuit 9 makes on the GIS experimental debugging device greater than 5PC office discharge signal.
Signal condition output circuit 10 is used for the GIS office discharge signal of signal threshold value filtering circuit output is carried out the adjustment of amplitude and/or output impedance.
Above-mentioned signal computing circuit 8, signal threshold value filtering circuit 9 and signal condition output circuit 10 are formed signal processing units, and mutual electromagnetic shielding between first antenna element 3, second antenna element 4, connect by signal wire and power lead.
Because the effect of exterior shield ring, the inner office of GIS discharge signal is only leaked at the shading ring opening portion, and since inner office discharge signal externally in the transmission course decay very big, so the detected signal intensity of putting generation of other parts beyond the shading ring opening by inner office extremely a little less than, but two parts are to the susceptibility and the detectability basically identical of external signal in the antenna sets, when GIS does not have innings discharge signal, its detected neighbourhood noise and undesired signal basically identical, after by signal operation and signal threshold value Filtering Processing, will be processed substantially fall.But when GIS inside has innings discharge signal to produce, the part relative with detection window is except that detecting neighbourhood noise and each undesired signal, also has office's discharge signal, another part relative with sealing place only detects neighbourhood noise and each undesired signal, though there is part office discharge signal to be detected, but since its signal intensity extremely a little less than, at the identical signal amplification circuit of process, after signal computing circuit and signal threshold value filtering circuit are handled, local discharge signal is detected and is exaggerated out by differentiation ground, after handling through the signal condition output circuit again, basically can be clean, intactly the inner office of output discharge signal only needs simple signal sampling and software analysis to handle to this signal and can realize GIS inside office is placed on the line monitoring.
The above only is preferred embodiment of the present utility model, and not in order to restriction the utility model, common variation that those skilled in the art carries out in the technical solutions of the utility model scope and replacement all should be included in the protection domain of the present utility model.
Claims (10)
1, a kind of interior partial discharge detection device for gas insulation composite apparatus comprises being arranged on the outer shading ring of GIS disc insulator ring that shading ring is provided with detection window, it is characterized in that: also comprise antenna sets and detecting unit; Described antenna sets comprises first antenna element and second antenna element at least; Described detecting unit comprises signal computing circuit.
2, interior partial discharge detection device for gas insulation composite apparatus as claimed in claim 1, it is characterized in that: the receive direction of described first antenna element is relative with described detection window, the receive direction of described second antenna element is relative with described shielding ring seal place, is provided with insulation gap between described first antenna element and second antenna element.
3, interior partial discharge detection device for gas insulation composite apparatus as claimed in claim 2 is characterized in that: the insulation gap between described first antenna element and second antenna element is 1 to 3 centimetre.
4, interior partial discharge detection device for gas insulation composite apparatus as claimed in claim 1, it is characterized in that: described antenna sets has the shielding outer cover, the lower openings of shielding outer cover covers the detection window on the described shading ring, and the shape of lower openings and the outside of shading ring are complementary.
5, interior partial discharge detection device for gas insulation composite apparatus as claimed in claim 1 is characterized in that: described first antenna element has identical receiving ability with second antenna element to same signal source.
6, interior partial discharge detection device for gas insulation composite apparatus as claimed in claim 1 is characterized in that: described signal computing circuit is the signal subtraction computing circuit.
7, interior partial discharge detection device for gas insulation composite apparatus as claimed in claim 6, it is characterized in that: described detecting unit also comprises first signal amplification circuit and secondary signal amplifying circuit, export signal computing circuit to after the GIS leakage signal that comprises the environmental interference signal that first signal amplification circuit receives first antenna element is amplified, export signal computing circuit to after the environmental interference signal that the secondary signal amplifying circuit receives second antenna element amplifies; First signal amplification circuit has identical amplifying power with the secondary signal amplifying circuit to same signal.
8, interior partial discharge detection device for gas insulation composite apparatus as claimed in claim 7 is characterized in that: described detecting unit also comprises signal threshold value filtering circuit and signal output modulate circuit.
9, interior partial discharge detection device for gas insulation composite apparatus as claimed in claim 8, it is characterized in that: described signal computing circuit, signal threshold value filtering circuit and signal output modulate circuit are formed signal processing unit, and mutual electromagnetic shielding between the first antenna detection unit, the second antenna detection unit, connect by signal wire and power lead.
10, interior partial discharge detection device for gas insulation composite apparatus as claimed in claim 8 is characterized in that: the threshold value of described signal threshold value filtering circuit can be passed through Partial Discharge Detection greater than 5PC office discharge signal for making on the pick-up unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201235019U CN201281745Y (en) | 2008-10-28 | 2008-10-28 | Detection device for internal local discharge of gas insulated combined electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201235019U CN201281745Y (en) | 2008-10-28 | 2008-10-28 | Detection device for internal local discharge of gas insulated combined electrical equipment |
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| Publication Number | Publication Date |
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| CN201281745Y true CN201281745Y (en) | 2009-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008201235019U Expired - Fee Related CN201281745Y (en) | 2008-10-28 | 2008-10-28 | Detection device for internal local discharge of gas insulated combined electrical equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103181A (en) * | 2009-12-17 | 2011-06-22 | 上海莫克电子技术有限公司 | Geographic information system (GIS) on-line local discharge monitoring system |
| CN107807316A (en) * | 2017-11-27 | 2018-03-16 | 清华四川能源互联网研究院 | Local discharge detection device and system |
-
2008
- 2008-10-28 CN CNU2008201235019U patent/CN201281745Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103181A (en) * | 2009-12-17 | 2011-06-22 | 上海莫克电子技术有限公司 | Geographic information system (GIS) on-line local discharge monitoring system |
| CN107807316A (en) * | 2017-11-27 | 2018-03-16 | 清华四川能源互联网研究院 | Local discharge detection device and system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090729 Termination date: 20141028 |
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| EXPY | Termination of patent right or utility model |