CN212111653U - Cable oscillatory wave partial discharge test system - Google Patents
Cable oscillatory wave partial discharge test system Download PDFInfo
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- CN212111653U CN212111653U CN201922231784.XU CN201922231784U CN212111653U CN 212111653 U CN212111653 U CN 212111653U CN 201922231784 U CN201922231784 U CN 201922231784U CN 212111653 U CN212111653 U CN 212111653U
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Abstract
The utility model provides a cable oscillatory wave partial discharge test system, control terminal communicates with high voltage testing arrangement through wiFi wireless mode, and high voltage testing arrangement is connected to high voltage cable tip through test connecting cable, and the condenser that reduces the frequency is connected to high voltage testing arrangement, and the safety control box is connected to high voltage testing arrangement. By applying direct-current high voltage to the tested cable and utilizing the capacitance characteristic of the cable to generate alternating-current voltage with frequency attenuation oscillation of dozens of to hundreds of hertz, the partial discharge caused by the insulation defect of the cable can be effectively detected and positioned without causing damage to the cable. The resonance voltage frequency is close to the power frequency, so that the severity of the internal defects of the cable can be measured, and the defects can be positioned; the device has the advantages of exquisite and compact structure, stable and reliable work and high safety, and not only can measure the severity of the internal defects of the cable, but also can position the defects; the equipment is small in size and convenient to carry.
Description
Technical Field
The utility model belongs to the technical field of the high tension cable state detects, concretely relates to cable oscillatory wave partial discharge test system.
Background
The high-voltage cable is difficult to detect the state under the power frequency voltage due to large capacity, the direct-current power supply is not suitable for the XLPE power cable, and the ultra-low frequency (0.1 Hz) power supply is adopted for testing, so that new defects in the cable can be caused due to the requirement of long testing time.
Disclosure of Invention
In order to overcome the not enough of above-mentioned prior art, the utility model aims at providing a cable oscillatory wave partial discharge test system for power cable's partial discharge detects and fixes a position, can measure the severity of cable internal defect, more can fix a position the defect.
In order to realize the purpose, the utility model discloses a technical scheme is:
a cable oscillatory wave partial discharge test system comprises a control terminal (1), wherein the control terminal (1) is communicated with a high-voltage test device (3) in a WiFi wireless mode, the high-voltage test device (3) is connected to the end part of a high-voltage cable (6) through a test connecting cable (4), a frequency reduction capacitor (5) is connected to the high-voltage test device (3), and a safety control box (2) is connected to the high-voltage test device (3);
the high-voltage testing device (3) consists of a connecting port (7), an air reactor (8), a light-operated high-voltage switch (9), a high-voltage generator (10), an interface panel (11), a controller (12), a coupling voltage divider (13), a supporting frame (14), an insulating cylinder (15) and a semiconductor cover plate (16); a bottom plate at the bottom of a support frame (14) is fixed with a light-operated high-voltage switch (9), a high-voltage generator (10), a controller (12) and a coupling voltage divider (13), a support is fixed with a hollow reactor (8) above the support frame (14), a connecting port (7) is installed on the hollow reactor (8), an insulating cylinder (15) is wrapped outside the support frame (14), and a semiconductor cover plate (16) penetrates through the connecting port (7) to cover the insulating cylinder (15); an interface panel (11) is arranged on the controller (12).
The safety control box (2) is connected with a control port of the high-voltage generator (10) through an interface panel (11) connector, and the output voltage of the high-voltage generator (10) charges the high-voltage cable (6) through the air reactor (8), the connection port (7) and the test connection cable (4); the light-operated high-voltage switch (9) is connected with the high-voltage charging end of the air reactor (8) in parallel, the coupling voltage divider (13) is connected with the high-voltage cable (6) in parallel through the connecting port (7), the controller (12) is connected with the control port of the high-voltage generator (10), the controller (12) is connected with the light-operated high-voltage switch (9) through an optical fiber, the controller (12) is connected with the output end of the coupling voltage divider (13), and the frequency reduction capacitor (5) is connected with the high-voltage cable (6) in parallel through the connecting port (7).
The medium of the support frame (14) is duralumin.
The medium of the insulating cylinder (15) is epoxy resin, so that the insulating strength is high.
The medium of the semiconductor cover plate (16) is made of a semi-conductive material and plays a role in voltage equalization.
The control terminal (1) adopts a PC computer.
The air-core reactor (8), the light-operated high-voltage switch (9), the high-voltage generator (10), the controller (12) and the coupling voltage divider (13) are fixed on the support frame (14) without fixed positions.
The utility model has the advantages that:
the cable oscillatory wave partial discharge test is a technique for detecting and positioning partial discharge of an XLPE power cable. By applying direct-current high voltage to the tested cable and utilizing the capacitance characteristic of the cable to generate alternating-current voltage with frequency attenuation oscillation of dozens of to hundreds of hertz, the partial discharge caused by the insulation defect of the cable can be effectively detected and positioned without causing damage to the cable. The oscillation test time is very short, only about hundreds of milliseconds, and the damage to the cable can be almost ignored; the resonant voltage frequency is close to the power frequency, the test condition is very close to the actual operation condition of the cable, so that the severity of the internal defect of the cable can be measured, and the defect can be positioned; the device has the advantages of exquisite and compact structure, stable and reliable work and high safety, and not only can measure the severity of the internal defects of the cable, but also can position the defects; the equipment is small in size and convenient to carry.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of the high voltage testing apparatus of the present invention.
Fig. 3 is a schematic circuit diagram of the present invention.
Wherein, 1 is a control analysis unit; 2 is a safety control box; 3 is a high voltage test unit; 4, testing the connecting cable; 5 is a frequency-reducing capacitor; 6 is a high-voltage cable; 7 is a connecting port; 8 is an air reactor; 9 is a light-operated high-voltage switch; 10 is a high voltage generator; 11 is an interface panel; 12 is a controller; 13 is a coupled voltage divider; 14 is a support frame; 15 is an insulating cylinder; and 16 is a semiconductor cover plate.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, a cable oscillatory wave partial discharge test system comprises a control terminal (1), and is characterized in that the control terminal (1) communicates with a high-voltage test device (3) in a WiFi wireless manner, the high-voltage test device (3) is connected to the end of a high-voltage cable (6) through a test connection cable (4), a frequency reduction capacitor (5) is connected to the high-voltage test device (3), and a safety control box (2) is connected to the high-voltage test device (3);
the high-voltage testing device (3) consists of a connecting port (7), an air reactor (8), a light-operated high-voltage switch (9), a high-voltage generator (10), an interface panel (11), a controller (12), a coupling voltage divider (13), a supporting frame (14), an insulating cylinder (15) and a semiconductor cover plate (16); a bottom plate at the bottom of a support frame (14) is fixed with a light-operated high-voltage switch (9), a high-voltage generator (10), a controller (12) and a coupling voltage divider (13), a support is fixed with a hollow reactor (8) above the support frame (14), a connecting port (7) is installed on the hollow reactor (8), an insulating cylinder (15) is wrapped outside the support frame (14), and a semiconductor cover plate (16) penetrates through the connecting port (7) to cover the insulating cylinder (15); an interface panel (11) is arranged on the controller (12).
The control analysis unit (1) is communicated with the controller (12) in a WiFi wireless mode, and controls the high-voltage test unit (3) to complete functions of applying specified direct-current voltage, closing a high-voltage switch, measuring and storing partial discharge signals, analyzing and positioning the partial discharge signals and the like; the safety control box (2) is connected with a control port of the high-voltage generator (10) through an interface panel (11) connector, and the voltage output of the high-voltage generator (10) is turned on or off; the high-voltage generator (10) outputs voltage to charge the high-voltage cable (6) through the air reactor (8), the connecting port (7) and the test connecting cable (4); the light-operated high-voltage switch (9) is connected with the high-voltage charging end of the air reactor (8) in parallel, and the switch is closed after the high-voltage cable (6) is charged, so that the high-voltage charging end of the air reactor (8) is conducted to the ground to form LC oscillating voltage; the coupling voltage divider (13) is connected with the high-voltage cable (6) in parallel through the connecting port (7) and couples the partial discharge signal and the voltage signal of the high-voltage cable; the controller (12) is connected with a control port of the high-voltage generator (10) and is used for controlling and collecting the amplitude of the output voltage of the high-voltage generator (10); the controller (12) is connected with the light-operated high-voltage switch (9) by adopting an optical fiber to control the on-off of the light-operated high-voltage switch; the controller (12) is connected with the output end of the coupling voltage divider (13) and is used for collecting partial discharge signals and voltage values of the high-voltage cable (6); the frequency reduction capacitor (5) is connected with the high-voltage cable (6) in parallel through the connecting port (7) to reduce LC oscillation frequency during testing.
The medium of the support frame (14) is duralumin.
The medium of the insulating cylinder (15) is epoxy resin, so that the insulating strength is high.
The medium of the semiconductor cover plate (16) is made of a semi-conductive material and plays a role in voltage equalization.
The control terminal (1) adopts a PC computer.
The air-core reactor (8), the light-operated high-voltage switch (9), the high-voltage generator (10), the controller (12) and the coupling voltage divider (13) are fixed on the support frame (14) without fixed positions.
The utility model discloses a theory of operation is:
a high-voltage generator (10) of the cable oscillatory wave partial discharge test system charges a high-voltage cable through an air-core reactor (8), and charges are accumulated between a core wire of the high-voltage cable and a grounding shield. After charging is finished, the light-operated high-voltage switch (9) is conducted to the ground instantly, accumulated charges on the cable are discharged to the ground through the air-core reactor (8) to form LC oscillation, voltage similar to power frequency LC oscillation is applied between a core wire of the high-voltage cable and a grounding shield, a partial discharge signal at the insulation defect position of the high-voltage cable is excited, and partial discharge is detected through a pulse current method.
On the basis of detecting a partial discharge signal, the severity of partial discharge is mastered through calibration of apparent discharge amount, the position of a fault point is calculated through the Bohr reflection principle of propagation of partial discharge pulse in a high-voltage cable, and the fault type is identified through a partial discharge characteristic spectrogram.
Claims (7)
1. A cable oscillatory wave partial discharge test system comprises a control terminal (1), and is characterized in that the control terminal (1) communicates with a high-voltage test device (3) in a WiFi wireless mode, the high-voltage test device (3) is connected to the end part of a high-voltage cable (6) through a test connecting cable (4), a frequency reduction capacitor (5) is connected to the high-voltage test device (3), and a safety control box (2) is connected to the high-voltage test device (3);
the high-voltage testing device (3) consists of a connecting port (7), an air reactor (8), a light-operated high-voltage switch (9), a high-voltage generator (10), an interface panel (11), a controller (12), a coupling voltage divider (13), a supporting frame (14), an insulating cylinder (15) and a semiconductor cover plate (16); a bottom plate at the bottom of a support frame (14) is fixed with a light-operated high-voltage switch (9), a high-voltage generator (10), a controller (12) and a coupling voltage divider (13), a support is fixed with a hollow reactor (8) above the support frame (14), a connecting port (7) is installed on the hollow reactor (8), an insulating cylinder (15) is wrapped outside the support frame (14), and a semiconductor cover plate (16) penetrates through the connecting port (7) to cover the insulating cylinder (15); an interface panel (11) is arranged on the controller (12).
2. The cable oscillatory wave partial discharge test system according to claim 1, characterized in that the safety control box (2) is connected with a control port of the high voltage generator (10) through a connector of an interface panel (11), and the output voltage of the high voltage generator (10) charges the high voltage cable (6) through the air reactor (8), the connection port (7) and the test connection cable (4); the light-operated high-voltage switch (9) is connected with the high-voltage charging end of the air reactor (8) in parallel, the coupling voltage divider (13) is connected with the high-voltage cable (6) in parallel through the connecting port (7), the controller (12) is connected with the control port of the high-voltage generator (10), the controller (12) is connected with the light-operated high-voltage switch (9) through an optical fiber, the controller (12) is connected with the output end of the coupling voltage divider (13), and the frequency reduction capacitor (5) is connected with the high-voltage cable (6) in parallel through the connecting port (7).
3. The cable oscillatory wave partial discharge test system according to claim 1, wherein the medium of the support frame (14) is duralumin.
4. The cable oscillatory wave partial discharge test system according to claim 1, wherein the dielectric of the insulating cylinder (15) is epoxy resin, and the insulating strength is high.
5. The cable oscillatory wave partial discharge test system according to claim 1, wherein the dielectric of the semiconductor cover plate (16) is a semi-conductive material, and the semi-conductive material has a voltage equalizing function.
6. The cable oscillatory wave partial discharge test system according to claim 1, wherein the control terminal (1) is a PC computer.
7. The cable oscillatory wave partial discharge test system according to claim 1, wherein the air core reactor (8), the light-operated high-voltage switch (9), the high-voltage generator (10), the controller (12) and the coupling voltage divider (13) are fixed on a support frame (14) without fixed orientation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922231784.XU CN212111653U (en) | 2019-12-13 | 2019-12-13 | Cable oscillatory wave partial discharge test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922231784.XU CN212111653U (en) | 2019-12-13 | 2019-12-13 | Cable oscillatory wave partial discharge test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212111653U true CN212111653U (en) | 2020-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922231784.XU Active CN212111653U (en) | 2019-12-13 | 2019-12-13 | Cable oscillatory wave partial discharge test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212111653U (en) |
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2019
- 2019-12-13 CN CN201922231784.XU patent/CN212111653U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A cable oscillating wave partial discharge test system Effective date of registration: 20221104 Granted publication date: 20201208 Pledgee: Xi'an innovation financing Company limited by guarantee Pledgor: XI'AN YUANCE ELECTRIC POWER TECHNOLOGY Co.,Ltd. Registration number: Y2022610000714 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20231008 Granted publication date: 20201208 Pledgee: Xi'an innovation financing Company limited by guarantee Pledgor: XI'AN YUANCE ELECTRIC POWER TECHNOLOGY Co.,Ltd. Registration number: Y2022610000714 |