CN111796174A - Detection device for high-voltage cable head - Google Patents
Detection device for high-voltage cable head Download PDFInfo
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- CN111796174A CN111796174A CN202010937708.5A CN202010937708A CN111796174A CN 111796174 A CN111796174 A CN 111796174A CN 202010937708 A CN202010937708 A CN 202010937708A CN 111796174 A CN111796174 A CN 111796174A
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- voltage cable
- cable head
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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
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to a detection device for a high-voltage cable head, comprising: the energy output unit is coupled with the resonance transmission unit and the energy receiving unit; the energy output unit comprises a direct current input module, the input end of the direct current input module is connected with a direct current power supply, the output end of the direct current input module is connected with the input end of the DC-DC conversion circuit, the output end of the DC-DC conversion circuit is connected with the first input end of the inverter circuit, the output end of the inverter circuit is connected with the coupling resonance transmission unit, and the second input end of the inverter circuit is connected with the PWM control module; the coupling resonance transmission unit comprises an induction coil, the output end of the inverter circuit is connected to the induction coil, a high-voltage cable head to be detected is placed in the induction coil, and two ends of the high-voltage cable head are connected to the analog alternating current input module; the periphery of the induction coil is sleeved with an energy receiving unit, the energy receiving unit comprises a magnetic flux sensor, the magnetic flux sensor is connected with a data processor, and the data processor is connected with a display.
Description
Technical Field
The invention belongs to the technical field of power detection equipment, relates to a detection device for a high-voltage cable head, and particularly relates to a detection device for a high-voltage cable head.
Background
After the cable is laid, in order to make the cable a continuous line, the cable sections must be connected into a whole, and the connection points between the cable sections are called cable connectors.
The cable joints at the middle of the cable run are called intermediate joints and the cable joints at the two ends of the run are called termination joints. The cable joint is used for locking and fixing the incoming and outgoing lines, and plays a role in water resistance, dust prevention and vibration prevention.
The quality of the cable joint directly affects the normal operation of the whole cable line.
Therefore, in the prior art, after the high-voltage cable head is manufactured, the high-voltage cable head can be used after passing a withstand voltage test. In the manufacturing process, the problems of sticking impurities, cutting sharp burrs on a semiconductor layer, deep scratches left in stripping and the like are encountered, a strong magnetic point is formed after the operation of unqualified process, and partial discharge is caused after long-time operation, so that the power accident is developed. The cable head faults can not be detected in a short-time voltage withstand test, and hidden dangers are left for safe operation of the cable. This is a disadvantage of the prior art.
In view of the above, the present invention provides a detection device for a high-voltage cable head; it is very necessary to solve the above technical problems in the prior art.
Disclosure of Invention
The invention aims to provide a detection device for a high-voltage cable head, aiming at the defects that the high-voltage cable head in the prior art has the defects of sticking impurities, sharp burrs in the cutting and peeling of a semiconductor layer, deep scratches in the peeling process and the like, forms strong magnetic points after operation and causes partial discharge after long-time operation, and becomes a power accident, so that the technical problems are solved.
In order to achieve the purpose, the invention provides the following technical scheme:
a testing device for a high voltage cable head, comprising:
the energy output unit is coupled with the resonance transmission unit, and the energy receiving unit;
the energy output unit comprises a direct current input module, the input end of the direct current input module is connected with a direct current power supply, the output end of the direct current input module is connected to the input end of a DC-DC conversion circuit, the output end of the DC-DC conversion circuit is connected to the first input end of an inverter circuit, the output end of the inverter circuit is connected to the coupling resonance transmission unit, and the second input end of the inverter circuit is also connected with a PWM control module;
the coupling resonance transmission unit comprises an induction coil, the output end of the inverter circuit is connected to the induction coil, a high-voltage cable head to be detected is placed in the induction coil, and two ends of the high-voltage cable head are connected to the analog alternating current input module; an energy receiving unit is sleeved on the periphery of the induction coil,
the energy receiving unit comprises a magnetic flux sensor, the magnetic flux sensor is connected with a data processor, and the data processor is connected with a display; the data processor fits the magnetic flux data acquired by the magnetic flux sensor to obtain a magnetic flux fitting curve, and the display displays the magnetic flux fitting curve obtained by the data processor; and if the magnetic flux fitting curve is a smooth curve, the quality of the high-voltage cable head to be detected is qualified, otherwise, the quality of the high-voltage cable head is unqualified.
Preferably, the data processor is further connected with a memory, and the memory is used for storing the fitted magnetic flux curve obtained by fitting.
Preferably, a blocking capacitor is arranged between the inverter circuit and the induction coil; and blocking the direct current signal output by the inverter circuit.
Preferably, in the detection process of the detection device, the PWM control module is adjusted to change the frequency of the output current of the inverter circuit, and data fitting is performed on the magnetic fluxes acquired by the magnetic flux sensors under different frequencies to obtain fitting curves under different frequencies; if all the fitting curves are smooth curves, the quality of the high-voltage cable head to be detected is qualified, otherwise, the quality of the high-voltage cable head is unqualified; the detection precision of the high-voltage cable head is improved.
Preferably, in the detection process, the detection device adjusts the frequency and amplitude of alternating current input to the high-voltage cable head by the analog alternating current input module, and performs data fitting on magnetic fluxes acquired by the magnetic flux sensors under different frequencies and amplitudes to obtain fitting curves under different frequencies and amplitudes; if all the fitting curves are smooth curves, the quality of the high-voltage cable head to be detected is qualified, otherwise, the quality of the high-voltage cable head is unqualified; the detection precision of the high-voltage cable head is improved.
Preferably, in the detection process, the detection device performs data fitting on the magnetic flux acquired by the magnetic flux sensor when the analog alternating current input module is in a non-input state (i.e., the analog alternating current input module does not perform charging operation on the high-voltage cable head) to obtain a fitting curve; if all the fitting curves are smooth curves, the quality of the induction coil is qualified, the analog alternating current power supply input unit is started, the high-voltage cable head is charged, and the detection is continued; otherwise, the induction coil is unqualified, and the detection step is continued after the induction coil is replaced. The quality problem of the induction coil is prevented from being transferred to the high-voltage cable head, and the detection precision of the high-voltage cable head is improved.
Preferably, in the detection process of the detection device, the PWM control module is adjusted to change the frequency of the output current of the inverter circuit, and data fitting is performed on the magnetic fluxes acquired by the magnetic flux sensors under different frequencies to obtain fitting curves under different frequencies; and if all the fitting curves are smooth curves, the quality of the induction coil is qualified, otherwise, the detection step is continued after the induction coil is replaced. The detection precision of the induction coil is improved, and the quality problem of the induction coil is further prevented from being transferred to the high-voltage cable head.
The method has the advantages that whether the high-voltage cable head has quality problems or not is judged by detecting the change of the influence of the high-voltage cable head on the magnetic field of the induction coil after being electrified; the limitation of the detection mode in the prior art is effectively overcome; the detection precision of the high-voltage cable head is improved.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
Fig. 1 is a schematic structural diagram of a detection device for a high-voltage cable head according to the present invention.
The device comprises an energy output unit 1, a 2-coupling resonance transmission unit, an energy receiving unit 3, a direct current input module 11, a direct current power supply 12, a DC-DC conversion circuit 13, an inverter circuit 14, a PWM control module 15, an induction coil 21, a high-voltage cable head 22, an analog alternating current input module 31, a magnetic flux sensor 32, a data processor 33, a display 34, a memory 34 and a blocking capacitor 5.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings by way of specific examples, which are illustrative of the present invention and are not limited to the following embodiments.
As shown in fig. 1, the present embodiment provides a detection device for a high-voltage cable head, including:
an energy output unit 1, a coupling resonance transmission unit 2, and an energy receiving unit 3;
the energy output unit 1 comprises a direct current input module 11, the input end of the direct current input module 11 is connected with a direct current power supply 12, the output end of the direct current input module is connected to the input end of a DC-DC conversion circuit 13, the output end of the DC-DC conversion circuit 13 is connected to the first input end of an inverter circuit 14, the output end of the inverter circuit 14 is connected to the coupling resonance transmission unit 2, and the second input end of the inverter circuit 14 is also connected with a PWM control module 15;
the coupling resonance transmission unit 2 comprises an induction coil 21, the output end of the inverter circuit 14 is connected to the induction coil 21, a high-voltage cable head 4 to be detected is placed in the induction coil 21, and two ends of the high-voltage cable head are connected to the analog alternating current input module 22; the periphery of the induction coil 21 is sleeved with an energy receiving unit 3, and a DC blocking capacitor 5 is arranged between the inverter circuit 14 and the induction coil 21; and blocking the direct current signal output by the inverter circuit.
The energy receiving unit 3 comprises a magnetic flux sensor 31, the magnetic flux sensor 31 is connected with a data processor 32, and the data processor 32 is connected with a display 33; the data processor 32 fits the magnetic flux data acquired by the magnetic flux sensor to obtain a magnetic flux fitting curve, and displays the magnetic flux fitting curve obtained by the data processor through the display; and if the magnetic flux fitting curve is a smooth curve, the quality of the high-voltage cable head to be detected is qualified, otherwise, the quality of the high-voltage cable head is unqualified. The data processor is also connected to a memory 34 for storing a fitted curve of the magnetic flux obtained by the fitting.
In the detection process of the detection device, the PWM control module is adjusted to change the frequency of the output current of the inverter circuit, and data fitting is carried out on the magnetic fluxes collected by the magnetic flux sensors under different frequencies to obtain fitting curves under different frequencies; if all the fitting curves are smooth curves, the quality of the high-voltage cable head to be detected is qualified, otherwise, the quality of the high-voltage cable head is unqualified; the detection precision of the high-voltage cable head is improved.
In the detection process, the detection device adjusts the frequency and the amplitude of alternating current input to the high-voltage cable head by the analog alternating current input module, and performs data fitting on magnetic fluxes acquired by the magnetic flux sensors under different frequencies and amplitudes to obtain fitting curves under different frequencies and amplitudes; if all the fitting curves are smooth curves, the quality of the high-voltage cable head to be detected is qualified, otherwise, the quality of the high-voltage cable head is unqualified; the detection precision of the high-voltage cable head is improved.
In the detection process, the detection device performs data fitting on the magnetic flux acquired by the magnetic flux sensor when the analog alternating current input module is in a non-input state (namely the analog alternating current input module does not charge the high-voltage cable head) to obtain a fitting curve; if all the fitting curves are smooth curves, the quality of the induction coil is qualified, the analog alternating current power supply input unit is started, the high-voltage cable head is charged, and the detection is continued; otherwise, the induction coil is unqualified, and the detection step is continued after the induction coil is replaced. The quality problem of the induction coil is prevented from being transferred to the high-voltage cable head, and the detection precision of the high-voltage cable head is improved.
In the detection process of the detection device, the PWM control module is adjusted to change the frequency of the output current of the inverter circuit, and data fitting is carried out on the magnetic fluxes collected by the magnetic flux sensors under different frequencies to obtain fitting curves under different frequencies; and if all the fitting curves are smooth curves, the quality of the induction coil is qualified, otherwise, the detection step is continued after the induction coil is replaced. The detection precision of the induction coil is improved, and the quality problem of the induction coil is further prevented from being transferred to the high-voltage cable head.
The above disclosure is only for the preferred embodiments of the present invention, but the present invention is not limited thereto, and any non-inventive changes that can be made by those skilled in the art and several modifications and amendments made without departing from the principle of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. A detection device for a high-voltage cable head, comprising:
the energy output unit is coupled with the resonance transmission unit, and the energy receiving unit;
the energy output unit comprises a direct current input module, the input end of the direct current input module is connected with a direct current power supply, the output end of the direct current input module is connected to the input end of a DC-DC conversion circuit, the output end of the DC-DC conversion circuit is connected to the first input end of an inverter circuit, the output end of the inverter circuit is connected to the coupling resonance transmission unit, and the second input end of the inverter circuit is also connected with a PWM control module;
the coupling resonance transmission unit comprises an induction coil, the output end of the inverter circuit is connected to the induction coil, a high-voltage cable head to be detected is placed in the induction coil, and two ends of the high-voltage cable head are connected to the analog alternating current input module; an energy receiving unit is sleeved on the periphery of the induction coil,
the energy receiving unit comprises a magnetic flux sensor, the magnetic flux sensor is connected with a data processor, and the data processor is connected with a display; the data processor fits the magnetic flux data acquired by the magnetic flux sensor to obtain a magnetic flux fitting curve, and the display displays the magnetic flux fitting curve obtained by the data processor; and if the magnetic flux fitting curve is a smooth curve, the quality of the high-voltage cable head to be detected is qualified, otherwise, the quality of the high-voltage cable head is unqualified.
2. The apparatus of claim 1, wherein the data processor is further coupled to a memory.
3. The detecting device for the high-voltage cable head according to claim 2, wherein a dc blocking capacitor is arranged between the inverter circuit and the induction coil.
4. The detecting device for the high-voltage cable head according to claim 3, wherein in the detecting process, the PWM control module is adjusted to change the frequency of the output current of the inverter circuit, and data fitting is performed on the magnetic fluxes collected by the magnetic flux sensors under different frequencies to obtain fitting curves under different frequencies; and if all the fitting curves are smooth curves, the quality of the high-voltage cable head to be detected is qualified, otherwise, the quality of the high-voltage cable head is unqualified.
5. The detecting device for the high-voltage cable head according to claim 4, wherein in the detecting process, the frequency and amplitude of the alternating current input to the high-voltage cable head by the analog alternating current input module are adjusted, and data fitting is performed on the magnetic fluxes collected by the magnetic flux sensors under different frequencies and amplitudes to obtain fitting curves under different frequencies and amplitudes; and if all the fitting curves are smooth curves, the quality of the high-voltage cable head to be detected is qualified, otherwise, the quality of the high-voltage cable head is unqualified.
6. The detecting device for the high-voltage cable head according to claim 5, wherein during the detection process, the detecting device performs data fitting on the magnetic flux collected by the magnetic flux sensor under the non-input state of the analog alternating current input module to obtain a fitting curve; if all the fitting curves are smooth curves, the quality of the induction coil is qualified, the analog alternating current power supply input unit is started, the high-voltage cable head is charged, and the detection is continued; otherwise, the induction coil is unqualified, and the detection step is continued after the induction coil is replaced.
7. The detecting device for the high-voltage cable head according to claim 6, wherein in the detecting process, the PWM control module is adjusted to change the frequency of the output current of the inverter circuit, and data fitting is performed on the magnetic fluxes collected by the magnetic flux sensors under different frequencies to obtain fitting curves under different frequencies; and if all the fitting curves are smooth curves, the quality of the induction coil is qualified, otherwise, the detection step is continued after the induction coil is replaced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010937708.5A CN111796174A (en) | 2020-09-09 | 2020-09-09 | Detection device for high-voltage cable head |
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| CN202010937708.5A CN111796174A (en) | 2020-09-09 | 2020-09-09 | Detection device for high-voltage cable head |
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| CN111796174A true CN111796174A (en) | 2020-10-20 |
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| CN202010937708.5A Pending CN111796174A (en) | 2020-09-09 | 2020-09-09 | Detection device for high-voltage cable head |
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| JP2013145142A (en) * | 2012-01-13 | 2013-07-25 | Azusa Tech Co | Winding inspection device |
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| CN109765464A (en) * | 2018-12-14 | 2019-05-17 | 福建和盛高科技产业有限公司 | Partial discharge monitoring device in a kind of 10kV distribution cable transition joint |
| CN109507558A (en) * | 2019-01-14 | 2019-03-22 | 广东电网有限责任公司 | A kind of turn insulation defect positioning method, the apparatus and system of coil with iron core |
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