A partial discharge testing device and system for cable testing

Abstract

The application relates to a partial discharge testing device and system for cable testing, which comprises an insulating shell, a high-voltage sleeve, a radiator and a moving part, the high-voltage sleeve is arranged on the upper side of the insulating shell, the radiator is arranged on the outer side of the insulating shell, the moving part is arranged on the lower side of the insulating shell and is rotationally connected with the insulating shell; the high-voltage sleeve comprises a plurality of hollow shells, a waterproof valve plate and a sleeve, the sleeve is arranged on the upper side of the insulating shell and is connected with the insulating shell, the waterproof valve plate is arranged on the top of the sleeve, and the plurality of hollow shells are stacked on the outer side of the sleeve from top to bottom, the structure of the partial discharge testing device is improved, the sleeve can be radiated by the plurality of hollow shells, and therefore the problem that the service life of the cable is affected due to overheating in the testing process can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of cable testing technology, and in particular to a partial discharge testing device and system for cable testing. Background Technology

[0002] When testing cables, high-voltage tests are used to determine whether the cable insulation has broken down, thus drawing a qualitative conclusion about whether the insulation condition is good or bad. However, for the sake of cable operation safety, testing cables can cause certain damage to the cables, thereby reducing their service life.

[0003] Existing technologies use DC voltage to charge the cable and then use the resulting damped oscillating wave to detect partial discharge for diagnosis and localization. However, applying DC voltage to the cable can easily lead to charge accumulation, which in turn causes false partial discharge and overheating. Therefore, improvements are urgently needed. Summary of the Invention

[0004] The purpose of this invention is to provide a partial discharge testing device and system for cable testing, so as to solve the problem in the prior art that overheating during cable testing will damage the cable life.

[0005] To achieve the above objectives, the present invention provides a partial discharge testing device for cable testing, comprising an insulating shell, a high-voltage sleeve, a heat sink, and a movable component. The high-voltage sleeve is disposed on the upper side of the insulating shell, the heat sink is disposed on the outer side of the insulating shell, and the movable component is disposed on the lower side of the insulating shell and rotatably connected to the insulating shell. The high-voltage sleeve includes multiple hollow shells, a waterproof valve plate, and a sleeve. The sleeve is disposed on the upper side of the insulating shell and connected to the insulating shell. The waterproof valve plate is disposed on the top of the sleeve. The multiple hollow shells are stacked sequentially from top to bottom on the outer side of the sleeve.

[0006] The insulating shell is used to prevent the user from being shocked during partial discharge testing. The high-voltage sleeve connects the cable. The heat sink is responsible for cooling the partial discharge testing device. The moving part is used to move the entire partial discharge testing device. The multiple hollow shells are used to cool the sleeve. The waterproof valve is used to prevent water from entering the partial discharge testing device when it is not in use, which could cause damage.

[0007] Each of the hollow shells includes a shell portion and multiple wire tubes. The multiple wire tubes are disposed on the inner side of the shell portion and surround the shell portion. The shell portion is sleeved on the outer side of the sleeve and is fixedly connected to the sleeve.

[0008] The shell portion is used to protect the multiple wire tubes. The arrangement of the multiple wire tubes improves the heat dissipation capacity of the hollow shell and avoids insufficient heat dissipation of the hollow shell.

[0009] The shell portion has an annular cavity and multiple mating interfaces. The annular cavity is located on the inner side of the shell portion and connects to the multiple mating interfaces, so that the multiple mating interfaces are connected to the outer wall of the sleeve. The multiple mating interfaces are arranged one-to-one with the multiple wire tubes, and the multiple mating interfaces are arranged around the outer side of the annular cavity.

[0010] The annular cavity is used to connect the plurality of mating interfaces and the sleeve, so that the sleeve can transfer heat through the annular cavity. The plurality of mating interfaces are used to install the wire tube. By placing the wire tube in the mating interface, the wire tube can dissipate heat to the air in the annular cavity, thereby achieving heat dissipation for the sleeve.

[0011] Each of the multiple wire tubes includes multiple heat dissipation rings and airflow channels. The inner diameter of the multiple heat dissipation rings gradually increases along the gas flow direction, and the multiple heat dissipation rings are disposed on the inner wall of the wire tube. The airflow channels are disposed at the connection between the inner wall of the wire tube and the heat dissipation rings, and the airflow channels are disposed along the extension direction of the wire tube.

[0012] By arranging multiple heat dissipation rings at intervals, the multiple heat dissipation rings dissipate heat from the wire tube. By setting the airflow channel at the connection between the heat dissipation rings and the wire tube, the airflow channel helps the heat dissipation rings dissipate heat. By connecting the airflow channel with the multiple heat dissipation rings at intervals, the airflow channel further exchanges the hot air inside the wire tube with the outside air, thereby improving the heat dissipation capacity of the wire tube.

[0013] The waterproof valve plate includes a sealing plate body and a torsion spring. The sealing plate body is disposed on the top of the high-pressure pipe sleeve and cooperates with the high-pressure pipe sleeve. The torsion spring connects the sealing plate body and the high-pressure pipe sleeve so that the sealing plate body and the high-pressure pipe sleeve can rotate together.

[0014] The sealing plate is used to seal the high-voltage sleeve, thereby sealing the partial discharge testing device when it is not in use, thus preventing external moisture from entering the partial discharge testing device.

[0015] This invention also proposes a partial discharge testing system for cable testing, employing the partial discharge testing device described above. The partial discharge testing system further includes a frequency converter, a resonant reactor module, an electronic switch module, a data acquisition and analysis module, and a voltage divider module. The frequency converter is connected to the partial discharge testing device and, through the partial discharge device, tests and boosts the voltage to excite the resonant reactor module and the voltage divider module to resonate. After connecting the voltage divider module to the power cable under test, by controlling the electronic switch module to close, the partial discharge testing device is short-circuited, allowing the data acquisition and analysis module to acquire the measurement data from the voltage divider module. This allows the acquisition of the partial discharge magnitude at the weak point in the insulation of the power cable under test, thus identifying insulation defects in the power cable.

[0016] By connecting the resonant reactor module in series with the partial discharge test device and the dedicated voltage divider in parallel with the resonant reactor module, and adjusting the frequency through the frequency converter, the partial discharge test device isolates and boosts the excitation to make the resonant reactor module resonate with the distributed capacitance of the cable under test. Under resonance conditions, a test voltage N times the excitation voltage can be obtained on the power cable under test. During the process of maintaining the test voltage on the power cable, the electronic switch module is closed by optical fiber control, short-circuiting the output terminal of the partial discharge test device, so that the resonant reactor module and the power cable under test form a gradually decaying damped oscillation. Through measurement and feedback control by the dedicated voltage divider, the partial discharge signal occurring in the weak insulation links of the power cable under test and its joints can be displayed regularly on the display screen of the data acquisition and analysis module. Through waveform data analysis, the discharge quantity value and extremely accurate location of the partial discharge occurring in the weak insulation links of the power cable under test and its joints are digitally displayed.

[0017] The present invention provides a partial discharge testing device and system for cable testing. The structure of the partial discharge testing device is improved by adding multiple hollow shells, which allow the bushing to dissipate heat through the multiple hollow shells, thereby effectively avoiding the problem of cable life being affected by overheating during the testing process. Attached Figure Description

[0018] Figure 1 This is an isometric structural diagram of a partial discharge testing device for cable testing provided by the present invention.

[0019] Figure 2 This is an isometric structural diagram of the high-voltage sleeve of a partial discharge testing device for cable testing provided by the present invention.

[0020] Figure 3 This is a top view schematic diagram of the high-voltage sleeve of a partial discharge testing device for cable testing provided by the present invention.

[0021] Figure 4This is a side cross-sectional view of the hollow shell of a partial discharge testing device for cable testing provided by the present invention.

[0022] Figure 5 This is a partially enlarged side cross-sectional view of the hollow shell of a partial discharge testing device for cable testing provided by the present invention.

[0023] Figure 6 This is a cross-sectional view of the heat sink of a partial discharge testing device for cable testing provided by the present invention.

[0024] Figure 7 This is a block diagram of a preferred embodiment of a partial discharge testing system for cable testing provided by the present invention.

[0025] 1-Insulating outer shell, 2-High voltage pipe sleeve, 3-Radiator, 4-Moving part, 5-Hollow shell, 6-Waterproof valve plate, 7-Sleeve, 8-Connecting ring, 9-Heat sink, 10-Shell part, 11-Wire tube, 12-Enclosed plate body, 13-Torsion spring, 14-Plate body, 15-Waveform plate, 16-Annular cavity, 17-Matching interface, 18-Heat sink ring, 19-Airflow channel, 20-Heat sink cavity, 21-Matching interface, 22-Frequency converter, 23-Resonant reactor module, 24-Electronic switch module, 25-Data acquisition and analysis module, 26-Voltage divider module. Detailed Implementation

[0026] Please see Figures 1 to 6 A partial discharge testing device for cable testing includes an insulating shell 1, a high-voltage sleeve 2, a heat sink 3, and a movable component 4. The high-voltage sleeve 2 is disposed on the upper side of the insulating shell 1, the heat sink 3 is disposed on the outer side of the insulating shell 1, and the movable component 4 is disposed on the lower side of the insulating shell 1 and rotatably connected to the insulating shell 1. The high-voltage sleeve 2 includes multiple hollow shells 5, a waterproof valve plate 6, and a sleeve 7. The sleeve 7 is disposed on the upper side of the insulating shell 1 and connected to the insulating shell 1. The waterproof valve plate 6 is disposed on the top of the sleeve 7, and the multiple hollow shells 5 are stacked sequentially from top to bottom on the outer side of the sleeve 7.

[0027] The insulating shell 1 is used to prevent the user from being shocked during partial discharge testing. The high-voltage sleeve 2 connects the cable. The heat sink 3 is responsible for cooling the partial discharge testing device. The movable part 4 is used to move the entire partial discharge testing device. The multiple hollow shells 5 are used to cool the sleeve 7. The waterproof valve 6 is used to prevent water from entering the partial discharge testing device when it is not in use, which could cause damage.

[0028] The heat sink 3 includes a connecting ring 8 and multiple heat sinks 9. The connecting ring 8 is sleeved on the outside of the insulating shell 1 and fixedly connected to it. The multiple heat sinks 9 are arranged radially around the connecting ring 8. The connecting ring 8, in conjunction with the heat sinks 9, wraps around the insulating shell 1, thereby transferring heat to the multiple heat sinks 9. The arrangement of the multiple heat sinks 9 enhances the heat dissipation effect of the heat sink 3, thus keeping the temperature of the entire partial discharge testing device at a low level.

[0029] Each heat sink 9 includes a plate body 14 containing a small amount of coolant under vacuum and several corrugated plates 15. The plate body 14 is fixedly connected to the connecting ring 8. The corrugated plates 15 are stacked on the side of the plate body 14 away from the connecting ring 8, and all corrugated plates 15 are in communication with the plate body 14. The coolant is high-purity water. The plate body 14, through the small amount of coolant inside, undergoes a phase change, causing the liquid coolant to vaporize after absorbing heat and enter the corrugated plates 15. After sufficient heat dissipation in the corrugated plates 15, it liquefies again and returns to the plate body 14, thereby completing the heat dissipation work for the insulating shell 1.

[0030] Each of the aforementioned wave-shaped plates 15 is provided with a heat dissipation cavity 20 and a connection interface 21. The heat dissipation cavity 20 is disposed on the inner side of the wave-shaped plates 15, and the connection interface 21 connects the heat dissipation cavity 20 and the plate body 14, through which coolant is transferred from the plate body 14. The heat dissipation cavity 20 is used to fully disperse the gaseous coolant, thereby dissipating heat upon contact with the outside environment. The connection interface 21 is used to deliver coolant from the plate body 14 to the heat dissipation cavity 20. After the coolant liquefies again, it can return to the plate body 14, thus completing the heat dissipation work.

[0031] Each of the hollow housings 5 ​​includes a shell portion 10 and a plurality of wire tubes 11. The wire tubes 11 are disposed inside the shell portion 10 and surround the shell portion 10. The shell portion 10 is fitted onto the outside of the sleeve 7 and is fixedly connected to the sleeve 7. The shell portion 10 protects the wire tubes 11, and the arrangement of the wire tubes 11 improves the heat dissipation capacity of the hollow housing 5, preventing insufficient heat dissipation. The shell portion 10 has an annular cavity 16 and a plurality of mating interfaces 17. The annular cavity 16 is disposed inside the shell portion 10 and connects to the plurality of mating interfaces 17, allowing the plurality of mating interfaces 17 to communicate with the outer wall of the sleeve 7. The plurality of mating interfaces 17 correspond one-to-one with the plurality of wire tubes 11, and the plurality of mating interfaces 17 surround the outside of the annular cavity 16.

[0032] The annular cavity 16 is used to connect the plurality of mating interfaces 17 and the sleeve 7, so that the sleeve 7 can transfer heat through the annular cavity 16. The plurality of mating interfaces 17 are used to install the wire tube 11. By placing the wire tube 11 in the mating interface 17, the wire tube 11 can dissipate heat from the air in the annular cavity 16, thereby achieving heat dissipation for the sleeve 7.

[0033] Each of the plurality of wire tubes 11 includes a plurality of heat dissipation rings 18 and airflow channels 19. The inner diameter of the plurality of heat dissipation rings 18 gradually increases along the gas flow direction, and the plurality of heat dissipation rings 18 are disposed on the inner wall of the wire tube 11. The airflow channels 19 are disposed at the connection between the inner wall of the wire tube 11 and the heat dissipation rings 18, and the airflow channels 19 are disposed along the extension direction of the wire tube 11. By spaced apart, the plurality of heat dissipation rings 18 dissipate heat from the wire tube 11. By placing the airflow channels 19 at the connection between the heat dissipation rings 18 and the wire tube 11, the airflow channels 19 further assist the heat dissipation rings 18 in dissipating heat. By connecting the airflow channels 19 with the plurality of heat dissipation rings 18 through the spacing, the airflow channels 19 further exchange hot air inside the wire tube 11 with the outside air, thereby improving the heat dissipation capacity of the wire tube 11.

[0034] The waterproof valve plate 6 includes a sealing plate body 12 and a torsion spring 13. The sealing plate body 12 is disposed on the top of the high-voltage sleeve 2 and cooperates with the high-voltage sleeve 2. The torsion spring 13 connects the sealing plate body 12 and the high-voltage sleeve 2, so that the sealing plate body 12 and the high-voltage sleeve 2 are rotatably engaged. The sealing plate body 12 is used to seal the high-voltage sleeve 2, thereby sealing the partial discharge testing device when it is not in use, thus preventing external moisture from entering the partial discharge testing device.

[0035] Please see Figure 7This invention also proposes a partial discharge testing system for cable testing, employing the partial discharge testing device described above. The partial discharge testing system further includes a frequency converter 22, a resonant reactor module 23, an electronic switch module 24, a data acquisition and analysis module 25, and a voltage divider module 26. The frequency converter 22 is connected to the partial discharge testing device and, through the partial discharge device, tests and boosts the voltage to excite the resonant reactor module 23 and the voltage divider module 26 to resonate. After connecting the voltage divider module 26 to the power cable under test, by controlling the electronic switch module 24 to close, the partial discharge testing device is short-circuited, allowing the data acquisition and analysis module 25 to acquire the measurement data from the voltage divider module 26. This allows the acquisition of the partial discharge value occurring at the weak point in the insulation of the power cable under test, thus identifying insulation defects in the power cable.

[0036] By connecting the resonant reactor module 23 in series with the partial discharge test device, and the dedicated voltage divider in parallel with the resonant reactor module 23, and adjusting the frequency through the frequency converter 22, the partial discharge test device isolates the boost excitation to make the resonant reactor module 23 resonate with the distributed capacitance of the cable under test. Under resonance conditions, a test voltage N times the excitation voltage can be obtained on the power cable under test. During the process of maintaining the test voltage on the power cable, the electronic switch module 24 is closed by optical fiber control to short-circuit the output terminal of the partial discharge test device, so that the resonant reactor module 23 and the power cable under test form a gradually decaying damped oscillation. Through measurement and feedback control by the dedicated voltage divider, the partial discharge signal of the weak insulation link of the power cable under test and its joints can be displayed regularly on the display screen of the data acquisition and analysis module 25. Through waveform data analysis, the discharge quantity value and extremely accurate location of the partial discharge of the weak insulation link of the power cable under test and its joints are digitally displayed.

[0037] The present invention provides a partial discharge testing device and system for cable testing. The structure of the partial discharge testing device is improved by adding multiple hollow shells 5, which allows the sleeve 7 to be dissipated by the multiple hollow shells 5, thereby effectively avoiding the problem of cable life being affected by overheating during the test.

Claims

1. A partial discharge testing device for cable testing, characterized in that, It includes an insulating shell, a high-voltage sleeve, a radiator, and a movable component. The high-voltage sleeve is disposed on the upper side of the insulating shell, the radiator is disposed on the outer side of the insulating shell, and the movable component is disposed on the lower side of the insulating shell and is rotatably connected to the insulating shell. The high-pressure bushing includes multiple hollow shells, a waterproof valve plate, and a sleeve. The sleeve is disposed on the upper side of the insulating shell and connected to the insulating shell. The waterproof valve plate is disposed on the top of the sleeve. Multiple hollow shells are stacked sequentially from top to bottom on the outer side of the sleeve. Each of the hollow shells includes a shell portion and a plurality of wire tubes. The plurality of wire tubes are disposed inside the shell portion and surround the shell portion. The shell portion is sleeved on the outside of the sleeve and the shell portion is fixedly connected to the sleeve. The shell has an annular cavity and multiple mating interfaces. The annular cavity is located on the inner side of the shell and connects to the multiple mating interfaces so that the multiple mating interfaces are connected to the outer wall of the sleeve. The multiple mating interfaces are arranged one-to-one with the multiple wire tubes and are arranged around the outer side of the annular cavity. Each of the multiple wire tubes includes multiple heat dissipation rings and airflow channels. The inner diameter of the multiple heat dissipation rings gradually increases along the gas flow direction, and the multiple heat dissipation rings are all disposed on the inner wall of the wire tube. The airflow channels are disposed at the connection between the inner wall of the wire tube and the heat dissipation rings, and the airflow channels are disposed along the extension direction of the wire tube.

2. The partial discharge testing device for cable testing as described in claim 1, characterized in that, The waterproof valve plate includes a sealing plate body and a torsion spring. The sealing plate body is disposed on the top of the high-pressure pipe sleeve and cooperates with the high-pressure pipe sleeve. The torsion spring connects the sealing plate body and the high-pressure pipe sleeve so that the sealing plate body and the high-pressure pipe sleeve can rotate together.

3. A partial discharge testing system for cable testing, employing the partial discharge testing device as described in claim 2, characterized in that, The partial discharge testing system also includes a frequency converter, a resonant reactor module, an electronic switch module, a data acquisition and analysis module, and a voltage divider module. The frequency converter is connected to the partial discharge testing device, and the partial discharge device tests and boosts the voltage to excite the resonant reactor module and the voltage divider module to resonate. After connecting the voltage divider module to the power cable under test, the electronic switch module is controlled to close, short-circuiting the partial discharge testing device. This allows the data acquisition and analysis module to acquire the measurement data from the voltage divider module, thereby obtaining the partial discharge value of the weak point in the insulation of the power cable under test and thus identifying the insulation defects of the power cable.

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