CN113380468A - Cable dehumidification method based on microwave injection heating and vacuum air extraction - Google Patents
Cable dehumidification method based on microwave injection heating and vacuum air extraction Download PDFInfo
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- CN113380468A CN113380468A CN202110694335.8A CN202110694335A CN113380468A CN 113380468 A CN113380468 A CN 113380468A CN 202110694335 A CN202110694335 A CN 202110694335A CN 113380468 A CN113380468 A CN 113380468A
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- cable
- microwave
- vacuum
- method based
- water molecules
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/30—Drying; Impregnating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
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- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a cable dehumidification method based on microwave injection heating and vacuum air extraction. The microwave emitter is used for emitting microwave, and when the microwave meets water molecules in the cable, the water molecules are heated and vaporized. And the two connecting joints are used for respectively connecting the cable with the microwave emitter and the vacuum air pump. The vacuum air pump is used for pumping away water molecules vaporized after the cable is heated by microwaves. The humidity sensor is used for monitoring the content of vaporized water molecules in the cable, and when the humidity measured value is smaller than a standard value, the vacuum dehumidification operation of the cable can be stopped.
Description
Technical Field
The invention belongs to the technical field of electrical equipment maintenance and repair, and particularly relates to a cable dehumidification method based on microwave injection heating and vacuum air extraction.
Background
Compared with overhead transmission lines, the power cable has the advantages of light weight, small occupied area, convenience in maintenance, small environmental influence and the like, so that the power cable is widely applied to a power system, and the operation reliability of the power cable is directly related to the stability and safety of the operation of a power grid system. During the storage, construction or operation of the crosslinked polyethylene cable, moisture and humidity can enter the cable insulation layer from the cable outer sheath or the cable end, and longitudinal penetration of water molecules occurs. After water enters and is affected with damp, the crosslinked polyethylene cable may have a water branch phenomenon under the action of a high-voltage electric field, partial discharge is generated, insulation aging is caused, cable breakdown is finally caused, and power supply reliability and operation stability are seriously threatened. Therefore, the regular or irregular dehumidification operation of the power cable has important application value for the operational reliability of the power system.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a cable dehumidification method based on microwave injection heating and vacuum air extraction, aiming at the defects of the prior art.
The technical scheme adopted by the invention is as follows: a cable dehumidification method based on microwave injection heating and vacuum air extraction comprises a microwave emitter, two connecting joints, a vacuum air extraction pump and a humidity sensor;
the microwave emitter is used for emitting microwave, and when the microwave meets water molecules in the cable, the water molecules are heated and vaporized. And the two connecting joints are used for respectively connecting the cable with the microwave emitter and the vacuum air pump. The vacuum air pump is used for pumping away water molecules vaporized after the cable is heated by microwaves. The humidity sensor is used for monitoring the content of vaporized water molecules in the cable, and when the humidity measured value is smaller than a standard value, the vacuum dehumidification operation of the cable can be stopped.
Preferably, the microwave emitter emits microwaves at a frequency of 2.4 GHz.
Preferably, the connection fitting should be sealingly connected to the cable, vacuum pump and microwave emitter.
Preferably, the outer layer material of the connecting joint is a metal product.
Preferably, the vacuum pump should have a certain high temperature resistance.
Preferably, the humidity sensor has been corrected by vacuum environment compensation to eliminate the influence of pressure on the detection result.
The invention has reasonable design, can carry out vacuum dehumidification operation on the cable after being damped in time, reduces the water branch phenomenon after the cable is damped, delays the insulation aging of the cable, and further obviously improves the reliability and the safety of power supply.
Drawings
Fig. 1 is a schematic diagram of the principle of the present invention.
Detailed Description
The present invention will be described in further detail with reference to fig. 1 and the following embodiments.
Examples
As shown in fig. 1, the present embodiment provides a cable dehumidification method based on microwave injection heating and vacuum pumping, which includes a microwave emitter, two connectors, a vacuum pump, and a humidity sensor;
the one microwave emitter is used for emitting microwaves, which will propagate inside the cable. In the process of microwave propagation, when encountering a cable copper conductor and a cable copper shielding layer, a reflection phenomenon occurs, so that the microwave only propagates in the cable; when the microwave meets the cable insulation crosslinked polyethylene, a penetration phenomenon occurs, so that the microwave can penetrate the crosslinked polyethylene; when microwave meets water molecules in the cable insulation crosslinked polyethylene, absorption phenomenon occurs, so that the water molecules are vibrated and heated in a short time, and the water molecules are heated and vaporized. The two connecting joints are used for connecting the cable and the microwave emitter with the vacuum air pump in a sealing manner. And the vacuum air pump is used for performing vacuum air pumping on the cable and pumping out vaporized water molecules after microwave heating. The humidity sensor is used for monitoring the content of vaporized water molecules in the cable, and when the humidity measured value is smaller than a standard value, the vacuum dehumidification operation of the cable can be stopped.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and inventive concept provided by the present invention should be covered within the scope of the present invention.
Claims (6)
1. A cable dehumidification method based on microwave injection heating and vacuum air extraction comprises a microwave emitter (1), two connecting joints (2), a vacuum air extraction pump (3) and a humidity sensor (4);
the method is characterized in that: the microwave emitter is used for emitting microwave, and when the microwave meets water molecules in the cable, the water molecules are heated and vaporized; the two connecting joints are used for respectively connecting the cable with the microwave emitter and the vacuum air pump; the vacuum air pump is used for pumping away water molecules vaporized after microwave heating in the cable; the humidity sensor is used for monitoring the content of vaporized water molecules in the cable, and when the humidity measured value is smaller than a standard value, the vacuum dehumidification operation of the cable can be stopped.
2. The cable dehumidification method based on microwave injection heating and vacuum pumping as claimed in claim 1, wherein: the microwave emitter emits microwaves at a frequency of 2.4 GHz.
3. The cable dehumidification method based on microwave injection heating and vacuum pumping as claimed in claim 1, wherein: the connecting joint is hermetically connected with the cable, the vacuum air pump and the microwave emitter.
4. The cable dehumidification method based on microwave injection heating and vacuum pumping as claimed in claim 1, wherein: the outer layer material of the connecting joint is a metal product.
5. The cable dehumidification method based on microwave injection heating and vacuum pumping as claimed in claim 1, wherein: the vacuum pump should have a certain high temperature resistance.
6. The cable dehumidification method based on microwave injection heating and vacuum pumping as claimed in claim 1, wherein: the humidity sensor is corrected by vacuum environment compensation to eliminate the influence of pressure on the detection result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110694335.8A CN113380468A (en) | 2021-06-22 | 2021-06-22 | Cable dehumidification method based on microwave injection heating and vacuum air extraction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110694335.8A CN113380468A (en) | 2021-06-22 | 2021-06-22 | Cable dehumidification method based on microwave injection heating and vacuum air extraction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113380468A true CN113380468A (en) | 2021-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110694335.8A Pending CN113380468A (en) | 2021-06-22 | 2021-06-22 | Cable dehumidification method based on microwave injection heating and vacuum air extraction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113380468A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09164215A (en) * | 1995-12-15 | 1997-06-24 | Olympus Optical Co Ltd | Microwave antenna |
| CN101552051A (en) * | 2008-04-01 | 2009-10-07 | 康迪 | Microwave self-heating power cable and de-icing device applying same |
| CN105743047A (en) * | 2016-04-12 | 2016-07-06 | 程鹏 | Deicing system for high-voltage power transmission line |
| CN112452120A (en) * | 2020-10-13 | 2021-03-09 | 中广核工程有限公司 | Submarine cable dehumidification device and method |
-
2021
- 2021-06-22 CN CN202110694335.8A patent/CN113380468A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09164215A (en) * | 1995-12-15 | 1997-06-24 | Olympus Optical Co Ltd | Microwave antenna |
| CN101552051A (en) * | 2008-04-01 | 2009-10-07 | 康迪 | Microwave self-heating power cable and de-icing device applying same |
| CN105743047A (en) * | 2016-04-12 | 2016-07-06 | 程鹏 | Deicing system for high-voltage power transmission line |
| CN112452120A (en) * | 2020-10-13 | 2021-03-09 | 中广核工程有限公司 | Submarine cable dehumidification device and method |
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Application publication date: 20210910 |
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| WD01 | Invention patent application deemed withdrawn after publication |