CN117092455A - Partial discharge detection device and partial discharge detection system - Google Patents
Partial discharge detection device and partial discharge detection system Download PDFInfo
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- CN117092455A CN117092455A CN202211356214.3A CN202211356214A CN117092455A CN 117092455 A CN117092455 A CN 117092455A CN 202211356214 A CN202211356214 A CN 202211356214A CN 117092455 A CN117092455 A CN 117092455A
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- 238000001514 detection method Methods 0.000 title claims abstract description 95
- 239000000523 sample Substances 0.000 claims abstract description 66
- 238000001914 filtration Methods 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 238000011045 prefiltration Methods 0.000 claims description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a partial discharge detection device, which comprises an outer shell and a sensor probe, wherein one side of the outer shell is provided with a jointing part for jointing the surface of a cable to be detected, the sensor probe is accommodated in the outer shell, the sensor probe is hemispherical, the spherical curved surface of the sensor probe corresponds to the jointing part of the outer shell, and the sensor probe can be coupled with high-frequency electromagnetic waves generated by the cable to be detected during partial discharge and output detection signals. The partial discharge detection device is convenient to operate and high in sensitivity, and can effectively improve the working efficiency of detection personnel. The invention also discloses a partial discharge detection system, which comprises a partial discharge detector and the partial discharge detection device, wherein the partial discharge detection device is electrically connected with the partial discharge detector and is used for transmitting detection signals to the partial discharge detector, and the partial discharge detector is used for analyzing the detection signals and judging whether the cable to be detected generates partial discharge or not.
Description
Technical Field
The invention particularly relates to a partial discharge detection device and a detection system.
Background
Partial discharge refers to discharge which occurs between electrodes but does not penetrate the electrodes, and the partial discharge causes serious damage to a power cable, and is particularly manifested in damage to an insulating material caused by factors such as partial heating generated by the discharge, impact of charged particles, chemical activity products, rays and the like, and finally, an insulation accident of the power cable is generated. Therefore, the safe operation and daily detection and maintenance of the power cable are more and more important, and the partial discharge detection of the cable is one of important methods for finding the latent defects and hidden dangers of the cable and is also one of important measures for the operation and maintenance of the power cable at present.
Currently, a common power cable partial discharge detection sensor device is a high-frequency CT (high frequency current transformer), i.e., an HFCT. Because the HFCT is in a closed installation form, the existing HFCT has the characteristics of heavy weight, large volume, difficult installation and the like. When in field partial discharge detection test, field operators clamp the HFCT on the grounding wire of the cable connector for carrying out partial discharge signal detection, if the cable body is to be detected, the heavy HFCT with larger caliber can only be adopted, and the HFCT with larger caliber has the advantages of heavy weight and easy damage when falling, thereby greatly reducing the working efficiency of the field operators.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provide a partial discharge detection device and a partial discharge detection system, wherein the partial discharge detection device has the advantages of small volume, light weight, convenient operation and high sensitivity, and can effectively improve the working efficiency of detection personnel.
According to an embodiment of the first aspect of the present invention, there is provided a partial discharge detection device, including an outer housing and a sensor probe, wherein a fitting portion is provided on one side of the outer housing, for fitting a surface of a cable to be detected, the sensor probe is accommodated in the outer housing, the sensor probe is hemispherical, a spherical curved surface of the sensor probe corresponds to the fitting portion of the outer housing, and the sensor probe is capable of coupling a high-frequency electromagnetic wave generated by the cable to be detected during partial discharge and outputting a detection signal.
Preferably, a printed circuit board is further accommodated in the outer casing, the printed circuit board is connected with the sensor probe through a sensor lead, and the printed circuit board is used for receiving the detection signal, filtering and amplifying the detection signal and outputting the detection signal.
Preferably, the printed circuit board comprises a board body, a pre-filter circuit, an amplifying circuit, a post-filter circuit and an interface are arranged on the board body, one end of the pre-filter circuit is a signal input end, the sensor probe is electrically connected with the signal input end and used for transmitting an output detection signal to the pre-filter circuit, the pre-filter circuit is electrically connected with the amplifying circuit and used for carrying out primary filtering on the detection signal and transmitting the detection signal subjected to primary filtering to the amplifying circuit, the amplifying circuit is electrically connected with the post-filter circuit and used for amplifying the detection signal subjected to primary filtering and transmitting the amplified detection signal to the post-filter circuit, and the post-filter circuit is used for carrying out secondary filtering on the detection signal and is electrically connected with the post-filter circuit and used for outputting the detection signal subjected to secondary filtering.
Preferably, a metal baffle is further arranged in the outer shell, and the metal baffle is located between the sensor probe and the printed circuit board and is used for shielding interference signals.
Preferably, a through hole is formed in the center of the metal baffle plate, and the through hole is used for the sensor lead wire to pass through.
Preferably, a buffer filling layer is further arranged in the outer shell, the buffer filling layer comprises two limiting plates which are vertically symmetrical, the sensor probe is located between the two limiting plates, and the limiting plates are used for limiting the displacement of the sensor probe in height.
Preferably, the limiting plate comprises a horizontal portion and a vertical portion, the horizontal portions of the two limiting plates are arranged in parallel, the sensor is located between the two horizontal portions, the two horizontal portions are used for being matched to limit up-and-down movement of the sensor probe, the vertical portions of the two limiting plates are located on the same vertical surface, and the two vertical portions are located between the sensor probe and the metal baffle.
Preferably, the buffer filling layer is made of polytetrafluoroethylene material.
Preferably, the sensor probe is a hemispherical body with a hollow structure, and the sensor probe is made of copper.
According to an embodiment of the second aspect of the present invention, there is provided a partial discharge detection system, including a partial discharge detector, and further including the partial discharge detection device described above, where the partial discharge detection device is electrically connected to the partial discharge detector and is configured to transmit a detection signal to the partial discharge detector, and the partial discharge detector is configured to analyze the detection signal and determine whether a cable to be tested generates partial discharge.
The sensor probe of the partial discharge detection device is a hemispherical body, and the spherical curved surface of the sensor probe corresponds to the attaching part of the outer shell. In the detection process, a worker attaches the attaching part to the surface of the cable to be detected, and the sensor probe can be coupled with high-frequency electromagnetic waves generated by the cable to be detected in partial discharge, so that detection signals are output. The sensing area of the sensor probe can be increased by arranging the spherical curved surface, the sensitivity of the sensor probe can be effectively improved, and the sensor probe can keep smaller volume and weight. Therefore, the partial discharge detection device has the advantages of small volume, light weight, convenient operation and high sensitivity, and can effectively improve the working efficiency of detection personnel.
Drawings
FIG. 1 is a schematic diagram of a partial discharge detection apparatus according to some embodiments of the present invention;
FIG. 2 is a diagram of circuit connections on a printed circuit board in some embodiments of the invention;
fig. 3 is a schematic diagram of a partial discharge detection system in some embodiments of the invention.
In the figure: 1-external shell, 2-sensor probe, 21-spherical curved surface, 22-sensor lead, 3-buffer filling layer, 4-metal baffle, 41-through hole, 5-printed circuit board, 51-interface, 52-pre-filter circuit, 53-amplifying circuit, 54-post-filter circuit, 6-cable to be tested, 7-communication cable and 8-partial discharge detector.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent, and the embodiments described in detail, but not necessarily all, in connection with the accompanying drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be noted that, the terms "upper," "lower," and the like indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in the drawings, and are merely for convenience and simplicity of description, and do not indicate or imply that the apparatus or element in question must be provided with a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, the terms "first," "second," "primary," "secondary," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "configured," "mounted," "secured," and the like are to be construed broadly and may be either fixedly connected or detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Example 1
Referring to fig. 1, the present invention discloses a partial discharge detection device, which comprises an outer housing 1 and a sensor probe 2.
Wherein, one side of the outer casing 1 is provided with a bonding part for bonding the surface of the cable 6 to be tested. The sensor probe 2 is accommodated in the outer casing 1, the sensor probe 2 is hemispherical, and the spherical curved surface 21 of the sensor probe 2 corresponds to the attaching part of the outer casing 1. The sensor probe 2 is capable of coupling high-frequency electromagnetic waves generated at the time of partial discharge of the cable 6 to be measured and outputting a detection signal. The cable 6 to be tested generates high-frequency electromagnetic waves when being partially discharged. The sensor probe 2 captures the high-frequency electromagnetic wave, and the sensor probe 2 generates an induction current signal, namely a detection signal, through the principle of electromagnetic induction.
Specifically, the outer casing 1 is made of plastic, and has a length and a width of 50mm and a thickness of 30mm. The spherical curved surface 21 of the sensor probe 2 can increase the sensing area of the sensor probe 2, and further can effectively improve the sensitivity of the sensor probe 2. Therefore, the sensor probe can also keep a small volume under the condition of not reducing sensitivity, thereby reducing the weight of the device and being convenient for staff to measure.
To further reduce the weight of the sensor probe 2, the sensor probe 2 is a hemisphere of hollow structure. In addition, the sensor probe 2 is made of copper material. The copper material has low price, good conductivity and low loss in the process of conducting current signals.
In the process of detection, a worker attaches the attaching part to the surface of the cable 6 to be detected, and then fixes the detection device and the cable 6 to be detected together through winding belts, so that the sensor probe 2 can couple high-frequency electromagnetic waves generated by the cable 6 to be detected in partial discharge, and detection signals are output.
Therefore, the partial discharge detection device does not need to carry out complex installation steps, has small volume, light weight, convenient operation and high sensitivity, and can effectively improve the working efficiency of detection personnel.
In this embodiment, the external housing 1 further accommodates a printed circuit board 5, and the printed circuit board 5 is connected to the sensor probe 2 through a sensor lead 22, and the printed circuit board 5 is configured to receive the detection signal, filter and amplify the detection signal, and output the filtered detection signal. Preferably, the sensor lead 22 is a copper enameled wire with a diameter of 0.2 mm.
As shown in fig. 2, the printed circuit board 5 includes a board body, on which a pre-filter circuit 52, an amplifying circuit 53, a post-filter circuit 54, and an interface 51 are disposed. One end of the pre-filter circuit 52 is a signal input end, and the sensor probe 2 is electrically connected to the signal input end, so as to transmit the output detection signal to the pre-filter circuit 52. The pre-filter circuit 52 is electrically connected to the amplifying circuit 53, and is configured to perform primary filtering on the detection signal, and transmit the primary filtered detection signal to the amplifying circuit 53. The amplifying circuit 53 is electrically connected to the post-filtering circuit 54, and is configured to amplify the detection signal after primary filtering, and transmit the amplified detection signal to the post-filtering circuit 54. The post-filter circuit 54 is configured to perform secondary filtering on the detection signal, and the interface 51 is electrically connected to the post-filter circuit 54 and configured to output the detection signal after the secondary filtering.
More specifically, the pre-filter circuit 52 and the post-filter circuit 54 are both band-pass filter circuits having a frequency bandwidth of 300kHz to 100MHz. I.e., the pre-filter circuit 52 and the post-filter circuit 54 are mainly used for filtering signals in a frequency band outside 300kHz to 100MHz in the detection signal. The amplifying circuit 53 is a selectable gain amplifying circuit 53, and the gain options include 10 times, 20 times, and 50 times. Interface 51 is an RJ45 interface.
Referring to fig. 1, in the present embodiment, a metal baffle 4 is further disposed in the outer housing 1, and the metal baffle 4 is located between the sensor probe 2 and the printed circuit board 5, for shielding interference signals, so as to improve the accuracy of measurement of the sensor probe 2. The interference signal mainly comes from the direction of the printed circuit board 5. Specifically, the metal baffle is a copper plate having a thickness of 0.1 mm. Further, a through hole 41 with a diameter of 2mm is formed in the center of the metal baffle plate 4, and the through hole 41 is circular for the sensor lead 22 to pass through.
With continued reference to fig. 1, in the present embodiment, a buffer filling layer 3 is further disposed in the outer casing 1. Preferably, the buffer filling layer 3 is made of polytetrafluoroethylene material. The buffer filling layer 3 comprises two limiting plates which are vertically symmetrical, the sensor probe 2 is positioned between the two limiting plates, and the limiting plates are used for limiting the displacement of the sensor probe 2 in height.
Specifically, the limiting plate includes a horizontal portion and a vertical portion. The horizontal parts of the two limiting plates are arranged in parallel at intervals along the vertical direction, the sensor is positioned between the two horizontal parts, and the two horizontal parts are used for being matched to limit the up-and-down movement of the sensor probe 2. The vertical parts of the two limiting plates are positioned on the same vertical surface and are positioned between the sensor probe 2 and the metal baffle 4. The two vertical portions serve to separate the sensor probe 2 from the metal shield 4 to avoid short-circuiting of the sensor probe 2 by contact with the metal shield 4. In addition, there is a space between the two uprights through which the sensor leads 22 can pass.
Example 2
Referring to fig. 3, according to an embodiment of the second aspect of the present invention, there is provided a partial discharge detection system including a partial discharge detector 8 and a partial discharge detection apparatus in embodiment 1.
The partial discharge detector 8 is used for analyzing the detection signal and judging whether the cable 6 to be tested generates partial discharge or not according to the analyzed detection signal.
In the process of carrying out partial discharge detection on a circuit to be detected, a worker firstly connects the partial discharge detection device with the partial discharge detector 8 through the communication cable 7, so that signal transmission can be carried out between the partial discharge detection device and the partial discharge detector 8. Then, the attaching portion of the partial discharge detecting device is attached to the cable 6 to be detected, and when partial discharge occurs in the cable 6 to be detected, the sensor probe 2 is coupled with the high-frequency electromagnetic wave of the cable 6 to be detected, and then a detection signal is output. The detection signal is filtered and amplified and then transmitted to the partial discharge detector 8.
Therefore, the partial discharge detection system can effectively detect whether the cable 6 to be detected generates partial discharge or not, and is convenient to operate and high in sensitivity.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (10)
1. A partial discharge detection apparatus, comprising: an outer housing (1) and a sensor probe (2),
one side of the outer shell (1) is provided with a jointing part (11) for jointing the surface of the cable (6) to be tested,
the sensor probe (2) is accommodated in the outer shell (1), the sensor probe (2) is hemispherical, a spherical curved surface (21) of the sensor probe (2) corresponds to the attaching part (11) of the outer shell (1), and the sensor probe (2) can be coupled with high-frequency electromagnetic waves generated by the cable (6) to be tested in partial discharge and output detection signals.
2. The device according to claim 1, characterized in that the outer housing (1) also accommodates a printed circuit board (5), the printed circuit board (5) being connected to the sensor probe (2) by means of a sensor lead (22),
the printed circuit board (5) is used for receiving the detection signals, filtering and amplifying the detection signals and outputting the detection signals.
3. The device according to claim 2, wherein the printed circuit board (5) comprises a board body, a pre-filter circuit (52), an amplifying circuit (53), a post-filter circuit (54) and an interface (51) are arranged on the board body, one end of the pre-filter circuit (52) is a signal input end,
the sensor probe (2) is electrically connected with the signal input end and is used for transmitting the output detection signal to a pre-filter circuit (52),
the pre-filter circuit (52) is electrically connected with the amplifying circuit (53) and is used for filtering the detection signal once and transmitting the detection signal after the once filtering to the amplifying circuit (53),
the amplifying circuit (53) is electrically connected with the post-filtering circuit (54) and is used for amplifying the detection signal after primary filtering and transmitting the amplified detection signal to the post-filtering circuit (54),
the post-filter circuit (54) is used for carrying out secondary filtering on the detection signal,
the interface (51) is electrically connected with the post-filter circuit (54) and is used for outputting a detection signal subjected to secondary filtering.
4. The device according to claim 2, characterized in that a metal baffle (4) is also arranged in the outer housing (1), which metal baffle (4) is located between the sensor probe (2) and the printed circuit board (5) for shielding interference signals.
5. The device according to claim 4, characterized in that the metal baffle (4) is provided with a through hole (41) in the center, said through hole (41) being intended for the passage of the sensor lead (22).
6. The device according to claim 4, characterized in that a buffer filling layer (3) is further arranged in the outer housing (1), the buffer filling layer (3) comprises two limiting plates which are symmetrical up and down, the sensor probe (2) is positioned between the two limiting plates, and the limiting plates are used for limiting the displacement of the sensor probe (2) in height.
7. The device of claim 6, wherein the limiting plate comprises a horizontal portion and a vertical portion,
the two horizontal parts of the limiting plates are arranged in parallel, the sensor is positioned between the two horizontal parts, the two horizontal parts are used for being matched to limit the up-and-down movement of the sensor probe (2),
the vertical parts of the two limiting plates are positioned on the same vertical surface and are positioned between the sensor probe (2) and the metal baffle plate (4).
8. The device according to claim 6, characterized in that the buffer filling layer (3) is made of polytetrafluoroethylene material.
9. The device according to any one of claims 1-8, characterized in that the sensor probe (2) is a hemispherical body of hollow structure, the sensor probe (2) being made of copper material.
10. A partial discharge detection system comprising a partial discharge detector (8), characterized in that it further comprises a partial discharge detection device according to any one of claims 1-9,
the partial discharge detection device is electrically connected with the partial discharge detector (8) and is used for acquiring detection signals and transmitting the detection signals to the partial discharge detector (8),
the partial discharge detector is used for judging whether the cable to be tested generates partial discharge or not according to the detection signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211356214.3A CN117092455B (en) | 2022-11-01 | 2022-11-01 | Partial discharge detection device and partial discharge detection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211356214.3A CN117092455B (en) | 2022-11-01 | 2022-11-01 | Partial discharge detection device and partial discharge detection system |
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| CN117092455B CN117092455B (en) | 2024-06-14 |
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| CN111443267A (en) * | 2020-05-29 | 2020-07-24 | 国网陕西省电力公司电力科学研究院 | Enhanced type 10kV overhead insulated wire partial discharge inspection device and inspection method |
| CN114062856A (en) * | 2020-08-05 | 2022-02-18 | 北京兴迪仪器有限责任公司 | Partial discharge power frequency synchronous sensor device |
| CN214252474U (en) * | 2020-09-08 | 2021-09-21 | 国能大渡河大岗山发电有限公司 | Intelligent sensor for cable partial discharge live detection |
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