CN110244203B - Partial discharge detection system and partial discharge detection device - Google Patents
Partial discharge detection system and partial discharge detection device Download PDFInfo
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- CN110244203B CN110244203B CN201910548527.0A CN201910548527A CN110244203B CN 110244203 B CN110244203 B CN 110244203B CN 201910548527 A CN201910548527 A CN 201910548527A CN 110244203 B CN110244203 B CN 110244203B
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- partial discharge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1209—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using acoustic measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1218—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing using optical methods; using charged particle, e.g. electron, beams or X-rays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention relates to a partial discharge detection system and a partial discharge detection device. The antenna is arranged on the reflecting polar plate and used for collecting partial discharge signals. The radio frequency connector is connected with the antenna and is used for connecting the signal processing equipment. The partial discharge detection device can perform non-contact detection on partial discharge of a high-voltage cable line, and by utilizing the characteristic that the intensity of a partial discharge signal is rapidly attenuated along with the increase of the distance, the partial discharge signals at different positions are detected by moving the partial discharge detection device, then the intensities of the partial discharge signals at different positions are compared, and the position with the strongest intensity of the partial discharge signal is the position of a partial discharge source.
Description
Technical Field
The invention relates to the technical field of power grid line maintenance, in particular to a partial discharge detection system and a partial discharge detection device.
Background
The partial discharge refers to a discharge phenomenon that occurs between electrodes but does not penetrate through the electrodes, and is a phenomenon that repeated breakdown and extinction occur under the action of high electric field strength due to weak current existing inside equipment insulation or defects caused in a production process. Partial discharges occurring under the action of high-strength electric fields are a common problem in high-voltage insulating media, which, although they do not generally cause a penetrating breakdown of the insulating medium, can lead to local damage to the dielectric, in particular to organic dielectrics. If partial discharge exists for a long time, the partial discharge can cause the deterioration of an insulating medium under certain conditions and even break down electric equipment. Therefore, the partial discharge detection can not only know the insulation condition of the equipment, but also find many problems related to manufacturing and installation in time and determine the reason and the severity of the insulation fault.
High-frequency pulse current method is generally adopted for detecting the charged partial discharge of the high-voltage cable line, but when the cable terminal is connected with an overhead conductor or equipment in a transformer substation, the method cannot effectively position the partial discharge signal detected at the cable terminal so as to confirm the partial discharge source.
Disclosure of Invention
Therefore, it is necessary to provide a partial discharge detection system and a partial discharge detection apparatus for solving the problem of how to locate a partial discharge source.
An partial discharge detection apparatus comprising:
a support member;
the reflecting polar plate is arranged on the supporting piece and used for reflecting the partial discharge signal;
the antenna is arranged on the reflecting polar plate and used for collecting the partial discharge signal; and the number of the first and second groups,
and the radio frequency connector is connected with the antenna and is used for connecting the signal processing equipment.
The partial discharge detection device can reflect and enhance partial discharge signals generated by partial discharge of the high-voltage cable line through the reflecting polar plate, so that the antenna can acquire the partial discharge signals reflected and enhanced by the reflecting polar plate. And the partial discharge detection device can be transmitted to external signal processing equipment through the radio frequency connector to obtain the intensity of a partial discharge signal, so that the partial discharge of the high-voltage cable line is detected in a non-contact manner. The partial discharge signal has the characteristic of wide frequency spectrum distribution, so that the intensity of the partial discharge signal is rapidly attenuated along with the increase of the distance, namely the closer to the partial discharge source, the stronger the partial discharge signal can be detected by the partial discharge detection device, the partial discharge signals at different positions are detected by moving the partial discharge detection device, and then the intensity of the partial discharge signals at different positions is compared, so that the position with the strongest intensity of the partial discharge signal is the position of the partial discharge source.
In one embodiment, the partial discharge detection device further includes a protection cover disposed on the reflection plate and covering the antenna.
In one embodiment, the protective cover comprises a cover body and a connecting table, the cover body covers the antenna, and the connecting table is connected with one side of the reflecting pole plate, which is far away from the supporting piece, and covers the reflecting pole plate.
In one embodiment, the support member has a first connection hole, the reflective plate has a second connection hole, the first connection hole is communicated with the second connection hole, and the rf connector is disposed through the first connection hole and the second connection hole.
In one embodiment, the partial discharge detection device further includes a fixing flange and a connecting member, wherein the fixing flange is sleeved outside the radio frequency connector and is connected with the supporting member through the connecting member.
In one embodiment, the partial discharge detection device further includes a handle disposed on a side of the support member away from the antenna.
In one embodiment, the partial discharge detection device further comprises a fixing foot, the fixing foot is arranged on one side of the support piece far away from the antenna, and the fixing foot is used for being connected with a foot stand holder.
The partial discharge detection system comprises a signal processing device and the partial discharge detection device, wherein the signal processing device is connected with one end, far away from the antenna, of the radio frequency connector, and the signal processing device is used for converting a partial discharge signal collected by the antenna into an audio signal or an image signal.
Above-mentioned detecting system is put in office can be through the reflection of partial discharge polar plate of detection device and strengthen the partial discharge signal that high-voltage cable line produced because partial discharge, the partial discharge signal after the reinforcing can be gathered through the antenna, and through the radio frequency connector with partial discharge signal transfer to signal processing equipment on, thereby signal processing equipment can be with partial discharge signal conversion for the intensity size of the audio signal or the image signal that people can be cognitive feeds back out partial discharge signal, thereby the realization carries out non-contact detection to the partial discharge of high-voltage cable line. The partial discharge signal has the characteristic of wide frequency spectrum distribution, so that the intensity of the partial discharge signal is rapidly attenuated along with the increase of the distance, namely the closer to the partial discharge source, the stronger the partial discharge signal can be detected by the partial discharge detection device, the partial discharge signals at different positions are detected by moving the partial discharge detection device, and then the position with the strongest partial discharge signal intensity is the position of the partial discharge source by comparing the intensities of the partial discharge signals at different positions reflected by the signal processing device.
In one embodiment, the partial discharge detection apparatus further includes a coaxial cable, and one end of the radio frequency connector, which is far away from the antenna, is connected to the signal processing device through the coaxial cable.
In one embodiment, the signal processing device is a partial discharge detector or an oscilloscope.
Drawings
Fig. 1 is a schematic structural diagram of a partial discharge detection apparatus according to an embodiment;
fig. 2 is an exploded view of the structure of the partial discharge detection apparatus shown in fig. 1.
Description of reference numerals:
100. a local detection device; 110. a support member; 111. a handle; 112. a fixing leg; 120. a reflective plate; 130. an antenna; 140. a radio frequency connector; 150. a protective cover; 151. a cover body; 152. a connecting table; 161. a fixed flange; 162. a connecting member.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," "up," "down," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The terms "first" and "second" used herein do not denote any particular order or quantity, but rather are used to distinguish one element from another.
The embodiment of the present application provides an partial discharge detection apparatus 100, which is used for detecting a partial discharge signal in an ultrahigh frequency band of a cable terminal. The partial discharge signal refers to an electromagnetic wave signal in a very high frequency band generated when a partial discharge occurs at the cable terminal, and the electromagnetic wave signal propagates to the air in the form of a wireless signal. The partial discharge signal of the uhf band means that the frequency of the partial discharge signal is in the order of gigahertz (GHz). Specifically, referring to fig. 1 and fig. 2, the partial discharge detection apparatus 100 of an embodiment includes a support member 110, a reflective plate 120, an antenna 130, and an rf connector 140. The supporting member 110 is made of a hard material and plays a role in supporting and fixing. The reflective plate 120 is used to reflect and enhance a partial discharge signal emitted from the cable terminal due to the partial discharge, and the antenna 130 is used to collect the partial discharge signal. The rf connector 140 is used for processing the partial discharge signal collected by the antenna 130 and transmitting the partial discharge signal to an external signal processing device, so that the signal processing device can analyze the intensity of the partial discharge signal and feed the intensity back to an operator.
Specifically, the reflective plate 120 is disposed on the support member 110, and preferably, the reflective plate 120 is laid on one surface of the support member 110. The antenna 130 is disposed on the reflective plate 120, and preferably, the antenna 130 is located on a side of the reflective plate 120 away from the support 110 and is located at the center of the reflective plate 120. One end of the rf connector 140 is connected to the antenna 130, and the other end of the rf connector 140 is used for connecting to a signal processing device.
The partial discharge detection device 100 can reflect and enhance the partial discharge signal generated by the partial discharge of the high-voltage cable line through the reflective plate 120, so that the antenna 130 can collect the partial discharge signal reflected and enhanced by the reflective plate 120. The partial discharge detection apparatus 100 can transmit the partial discharge signal to an external signal processing device through the rf connector 140 to obtain the intensity of the partial discharge signal, so as to implement non-contact detection of the partial discharge of the high-voltage cable line. Because the partial discharge signal has the characteristic of wide frequency spectrum distribution, the intensity of the partial discharge signal is rapidly attenuated along with the increase of the distance, namely, the closer to the partial discharge source, the stronger the partial discharge signal can be detected by the partial discharge detection device 100, so that the partial discharge signal intensities at different positions are detected by moving the partial discharge detection device 100, and then the intensities of the partial discharge signals at different positions are compared, and the position with the strongest partial discharge signal intensity is the position of the partial discharge source.
Specifically, with continued reference to fig. 1 and fig. 2, the partial discharge detection apparatus 100 further includes a protective cover 150, and the protective cover 150 is disposed on the reflective plate 120 and covers the antenna 130. The protective cover 150 is used to protect the antenna 130 and prevent the antenna 130 from being deformed or damaged due to external impact. Further, the protective cover 150 includes a cover body 151 and a connection stage 152, and the connection stage 152 extends outward in a radial direction of the cover body 151. The cover 151 has a barrel-shaped structure with an opening. The cover 151 covers the antenna 130, and the connection pad 152 is connected to a side of the reflective plate 120 away from the support 110 and covers the reflective plate 120. The protective cover 150 can protect the antenna 130 through the cover 151 and also protect the reflective plate 120 through the connection base 152, thereby preventing the reflective plate 120 from being damaged due to abrasion or corrosion. Preferably, the material of the protective cover 150 is plastic or other non-metallic hard material.
Further, the supporting member 110 is formed with a first connection hole, the reflective plate 120 is formed with a second connection hole, and the first connection hole is communicated with the second connection hole. The rf connector 140 is disposed in the first connection hole and the second connection hole, and two ends of the rf connector 140 respectively penetrate through the first connection hole and the second connection hole. Further, the partial discharge detection apparatus 100 further includes a fixing flange 161 and a connecting member 162, the fixing flange 161 is sleeved outside the radio frequency connector 140, and the fixing flange 161 is fixedly connected to the radio frequency connector 140. The fixing flange 161 is connected to the support 110 by a connector 162. Specifically, a plurality of locking holes are symmetrically formed in the peripheries of the first connecting hole and the second connecting hole, and the connecting member 162 is disposed on the fixing flange 161 and penetrates through the locking holes. The number and the positions of the connecting members 162 are matched with the locking holes, so that the fixing flange 161 and the radio frequency connector 140 can be fixed on the support member 110 by matching the connecting members 162 with the locking holes. Preferably, in the present embodiment, the rf connector 140 may be an N-type connector.
Further, the partial discharge detection apparatus 100 further includes a handle 111, and the handle 111 is disposed on a side of the support 110 away from the antenna 130. The handle 111 is used for a user to grasp, thereby facilitating carrying and using the partial discharge detection apparatus 100. Further, the partial discharge detection device 100 further includes a fixing pin 162, the fixing pin 162 is disposed on a side of the support member 110 away from the antenna 130, and the fixing pin 162 is used for being connected to a tripod head. Specifically, when long-time detection is performed, the partial discharge detection device 100 is fixed on the tripod head by arranging the fixing feet 162 and the handle 111 on the tripod head, so that the user is prevented from holding the handle 111 for a long time, and the workload of the user is reduced.
Preferably, the material of the antenna 130 and the reflective plate 120 is copper, and the material of the support 110, the handle 111 and the fixing pin 162 is epoxy resin. Further, in the present embodiment, the antenna 130 is a linear antenna 130. It should be noted that, in other embodiments, the antenna 130 may have other structures, for example, the antenna 130 includes a main rod and at least two branches connected to the main rod, one end of the main rod is connected to the rf connector 140, the other end of the main rod is connected to the at least two branches, and the at least two branches are radially disposed, so as to improve the signal acquisition efficiency and accuracy of the antenna.
Further, the present application also provides an partial discharge detection system, which includes a signal processing device and the partial discharge detection apparatus 100 of any of the above embodiments, where the signal processing device is connected to the radio frequency connector 140 of the partial discharge detection apparatus 100. Specifically, the partial discharge detection apparatus 100 further includes a coaxial cable, and one end of the rf connector 140 away from the antenna 130 is connected to the signal processing device through the coaxial cable. The signal processing device is used for converting the partial discharge signal collected by the antenna 130 into an audio signal or an image signal, so that a user can judge the strength of the partial discharge signal through the audio signal or the image signal, and further judge the position of the partial discharge source. Preferably, the signal processing device is a partial discharge detector or an oscilloscope. Specifically, the partial discharge detector can convert the partial discharge detected by the partial discharge detection device 100 into an audio signal, so that the user can hear the sounds through the earphone and see the signal strength indication on the pointer. The oscilloscope can convert the partial discharge detected by the partial discharge detection apparatus 100 into a waveform signal, so that a user can acquire local signal intensity information by observing the waveform intensity.
The partial discharge signal generated by the partial discharge of the high-voltage cable line can be reflected and enhanced by the reflecting polar plate 120 of the partial discharge detection device, the enhanced partial discharge signal can be collected by the antenna 130, and the partial discharge signal is transmitted to the signal processing equipment by the radio frequency connector 140, the signal processing equipment can convert the partial discharge signal into an audio signal or an image signal which can be recognized by a user, so that the user judges the intensity of the partial discharge signal, and the non-contact detection of the partial discharge of the high-voltage cable line is realized. Because the partial discharge signal has the characteristic of wide frequency spectrum distribution, the intensity of the partial discharge signal is rapidly attenuated along with the increase of the distance, namely, the closer to the partial discharge source, the stronger the partial discharge signal can be detected by the partial discharge detection device 100, so that the partial discharge signals at different positions are detected by moving the partial discharge detection device 100, and then the position with the strongest partial discharge signal intensity is the position of the partial discharge source by comparing the intensities of the partial discharge signals at different positions fed back by the signal processing equipment.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An partial discharge detection apparatus, comprising:
a support member;
the reflecting polar plate is arranged on the supporting piece and used for reflecting a partial discharge signal, wherein the partial discharge signal refers to an electromagnetic wave signal generated when partial discharge occurs at a cable terminal;
the antenna is arranged on one side, far away from the support piece, of the reflecting polar plate, so that the reflecting surface of the reflecting polar plate faces the antenna and is used for collecting the partial discharge signal; and the number of the first and second groups,
and the radio frequency connector is connected with the antenna and is used for connecting the signal processing equipment.
2. The partial discharge detection device according to claim 1, further comprising a protective cover disposed on the reflective plate and covering the antenna.
3. The partial discharge detection device according to claim 2, wherein the protection cover includes a cover body covering the antenna and a connection platform connected to a side of the reflection plate away from the support member and covering the reflection plate.
4. The partial discharge detection device according to claim 1, wherein the support member has a first connection hole, the reflective plate has a second connection hole, the first connection hole is communicated with the second connection hole, and the rf connector is disposed through the first connection hole and the second connection hole.
5. The device according to claim 1, further comprising a fixing flange and a connecting member, wherein the fixing flange is disposed outside the rf connector and connected to the supporting member through the connecting member.
6. The partial discharge detection device according to claim 1, further comprising a handle disposed on a side of the support member away from the antenna.
7. The partial discharge detection device according to claim 1, further comprising a fixing pin, wherein the fixing pin is disposed on a side of the support member away from the antenna, and the fixing pin is used for being connected to a tripod head.
8. An office discharge detection system, characterized in that it comprises a signal processing device and an office discharge detection device as claimed in any of claims 1-7, said signal processing device is connected to the end of said rf connector away from said antenna, said signal processing device is used to convert the partial discharge signal collected by said antenna into an audio signal or an image signal.
9. The partial discharge detection system according to claim 8, wherein the partial discharge detection apparatus further comprises a coaxial cable, and an end of the rf connector away from the antenna is connected to the signal processing device through the coaxial cable.
10. The partial discharge detection system according to claim 8, wherein the signal processing device is a partial discharge detector or an oscilloscope.
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| CN201910548527.0A CN110244203B (en) | 2019-06-24 | 2019-06-24 | Partial discharge detection system and partial discharge detection device |
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| CN201910548527.0A CN110244203B (en) | 2019-06-24 | 2019-06-24 | Partial discharge detection system and partial discharge detection device |
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| CN110244203A CN110244203A (en) | 2019-09-17 |
| CN110244203B true CN110244203B (en) | 2022-03-01 |
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| CN203117367U (en) * | 2013-03-08 | 2013-08-07 | 河北浩正电力设备制造有限公司 | Ultrahigh-frequency sensor |
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| CN206818837U (en) * | 2017-06-28 | 2017-12-29 | 国家电网公司 | Local discharge detection device |
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| CN203688730U (en) * | 2013-12-31 | 2014-07-02 | 青岛华电高压电气有限公司 | Hand-held directional sensor |
| KR101904113B1 (en) * | 2016-12-23 | 2018-12-03 | 산일전기 주식회사 | System of Condition Based Risk Management in Transformer |
| CN107831404B (en) * | 2017-09-22 | 2020-02-14 | 国网山东省电力公司电力科学研究院 | Method and system for positioning XLPE cable partial discharge position based on high-frequency pulse current method |
| CN108152613A (en) * | 2017-11-24 | 2018-06-12 | 国网北京市电力公司 | A kind of UHF radio waves sensor |
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| CN203117367U (en) * | 2013-03-08 | 2013-08-07 | 河北浩正电力设备制造有限公司 | Ultrahigh-frequency sensor |
| CN104655995A (en) * | 2015-01-29 | 2015-05-27 | 国家电网公司 | Dual-end positioning method for partial discharge source of power cable |
| CN104597382A (en) * | 2015-02-04 | 2015-05-06 | 北京国电辉煌科技发展有限责任公司 | Ultrahigh frequency sensor based on metal basin type insulator hole opening |
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