CN107274981B - Simulation cable for cable accessory test and detection method of cable accessory - Google Patents
Simulation cable for cable accessory test and detection method of cable accessory Download PDFInfo
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- CN107274981B CN107274981B CN201710551888.1A CN201710551888A CN107274981B CN 107274981 B CN107274981 B CN 107274981B CN 201710551888 A CN201710551888 A CN 201710551888A CN 107274981 B CN107274981 B CN 107274981B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/06—Single tubes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/40—Insulated conductors or cables characterised by their form with arrangements for facilitating mounting or securing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
Abstract
The invention provides a simulation cable for a cable accessory test and a detection method of a cable accessory, wherein the simulation cable comprises a simulation cable body, the simulation cable body sequentially comprises a conductor, an insulating protective layer and a shielding layer from inside to outside, and a ventilation channel is arranged in the middle of the conductor of the simulation cable body; the simulation cable for the cable accessory test comprises a first simulation cable component and a second simulation cable component, wherein the first simulation cable component comprises a first simulation cable body and a connection male head, the second simulation cable component comprises a second simulation cable body and a connection female head matched with the connection male head, and the connection male head is provided with a male head gas channel and a male head gas outlet; the connecting female is provided with a female gas channel and a female gas outlet. By adopting the technical scheme of the invention, the structure function of the cable is equivalent to that of an actual cable, the product test is convenient to assemble and disassemble, the efficiency of the product delivery test is improved, and the manufacturing cost is lower.
Description
Technical Field
The invention belongs to the technical field of cable accessories, and particularly relates to a simulation cable for a cable accessory test and a detection method of the cable accessory.
Background
At present, the medium-voltage power cable accessory mainly comprises a cold-shrink cable accessory, in the current cable accessory industry, the medium-voltage power cable accessory is mainly installed by adopting a standard power cable, then an electric test is carried out, a standard power cable conductor is a compact cylinder stranded by copper wires or aluminum wires, and the insulation is crosslinked polyethylene. The field installation mode of the medium-voltage cable accessory is to add the plastic supporting cylinder by factory pre-expansion, and then to extract the plastic supporting cylinder on the field. However, the cold-shrink cable accessory cannot be repeatedly expanded, so that the product delivery test is difficult to carry out, or the test cost is very high. In the existing industry, factory tests of cold-shrink cable accessories are carried out, wherein a small amount of products are mainly subjected to spot check and are actually installed on a real power cable for testing, and the products are directly scrapped after the test. The existing cold-shrink cable accessory is mounted on a standard power cable and needs to be in interference fit with the cable due to the structural reason, so that the cold-shrink cable accessory is difficult to take out after the test is finished, and therefore, the existing cold-shrink cable accessory is usually only extracted to be mounted on the cable in a small amount for test, and the accessory is directly scrapped after the test is finished. The existing standard power cable cannot be used for carrying out a large number of factory test total inspection works, and is high in installation difficulty and test cost. In addition, although the existing standard power cable can meet the installation test of the cable accessories, the cable has a large number of requirements, but the required length is not large, so that the purchase of the cable is difficult, and the factory test cost of the cable accessories is high.
Disclosure of Invention
Aiming at the technical problems, the invention discloses a simulation cable for a cable accessory test and a detection method of the cable accessory, which are used for a medium-voltage cable accessory factory test, can be equivalent to the structural function of an actual cable, can realize the disassembly and assembly of a product test, improve the efficiency of the product factory test, and reduce the test cost.
In this regard, the invention adopts the following technical scheme:
the simulation cable for the cable accessory test comprises a simulation cable body, wherein the simulation cable body sequentially comprises a conductor, an insulating protective layer and a shielding layer from inside to outside, and a ventilation channel is formed in the middle of the conductor of the simulation cable body;
the simulation cable for the cable accessory test comprises a first simulation cable component and a second simulation cable component, wherein the first simulation cable component comprises a first simulation cable body and a connection male head, one end of the first simulation cable body is connected with the connection male head, and a fixed connecting piece is arranged at the other end of the first simulation cable body; the second simulation cable component comprises a second simulation cable body and a connection female head matched with the connection male head, one end of the second simulation cable body is connected with the connection female head, and a fixed connecting piece is arranged at the other end of the second simulation cable body; the male connector is provided with a male connector gas channel and a male connector gas outlet, the male connector gas channel is communicated with the ventilation channel of the first simulation cable body, and the male connector gas outlet is communicated with the male connector gas channel;
the female head of connection is equipped with female first gas passage and female first gas outlet, female first gas passage communicates with the passageway of ventilating of second emulation cable body, female first gas outlet communicates with female first gas passage. Wherein, the male connection head and the female connection head are made of conductive materials.
By adopting the technical scheme, when the cable accessory is tested, the first simulation cable component and the second simulation cable component are connected in a matched manner through the male connection head and the female connection head to form a simulation cable, and then the cable accessory is mounted on the simulation cable for testing, so that the installation is convenient; through the ventilation channel of design at the conductor center, the nitrogen gas is filled in from the ventilation channel at conductor center when installing and dismantling the annex, props up the annex through the nitrogen gas atmospheric pressure and realizes quick loading and unloading, simple to operate, and can not damage the annex. Moreover, the simulation cable can be repeatedly used for testing, so that the cost is greatly reduced.
As a further improvement of the invention, the female gas outlet is located at the head of the female gas channel and the male gas outlet is located at the head of the male gas channel. During installation, after the female head is connected with the male head, a gap is reserved between the gas outlet of the female head and the gas outlet of the male head, so that when nitrogen is introduced, gas is convenient to overflow and the accessory is supported.
As a further improvement of the invention, the material of the insulating protective layer is epoxy resin. By adopting the technical scheme, unlike the insulation protection layer of the conventional cable, the insulation protection layer of the conventional cable is made of flexible materials, and the simulation cable provided by the invention is high in hardness after being cured by epoxy resin, and good in support degree is provided, so that the installation of cable accessories is facilitated.
As a further development of the invention, the surface of the conductor is provided with a layer of conductive elastic material, which is connected to the insulating protective layer. By adopting the technical scheme, the conductor and the insulating protective layer form good combination. Wherein the conductive elastic material layer is an elastic conductive material.
As a further improvement of the invention, the surface of the conductor is coated with a composite conductive elastic material layer after being subjected to sand blasting treatment. By adopting the technical scheme, after the surface of the conductor is subjected to surface treatment, the surface is coated with the composite conductive elastic material layer, so that the conductor and an insulating protective layer such as epoxy insulation are better combined.
As a further improvement of the invention, the head of the connecting male head is provided with a connecting piece, the middle part of the connecting female head is provided with a groove, and the connecting piece is clamped with the groove or connected with the groove through threads. By adopting the technical scheme, the installation and the disassembly are convenient, and the connection is reliable. Further, the female gas outlet is located in the groove, the male gas outlet is located at the head of the connecting piece, and when the connecting piece is clamped with the groove or connected through threads, a gap is reserved between the female gas outlet and the male gas outlet, so that gas can overflow from the connecting part of the connecting piece and the groove conveniently.
As a further improvement of the invention, the shielding layer is made of conductive epoxy resin.
The invention also discloses a detection method of the cable accessory, which adopts the simulation cable for the cable accessory test to detect, and comprises the following steps:
step S1, the connection male head of a first simulation cable component and the connection female head of a second simulation cable component are matched with each other to form a complete simulation cable;
and S2, mounting the cold-shrink or prefabricated cable accessory on the simulation cable, filling nitrogen or inert gas from a ventilation channel of the conductor during mounting, supporting the accessory through air pressure, mounting the cold-shrink or prefabricated cable terminal at two ends of the simulation cable, mounting the middle of the cold-shrink or prefabricated cable at the connection position of the connection male head and the connection female head of the simulation cable, stopping filling air, connecting the conductor with a high-voltage equipment source for factory test, filling nitrogen or inert gas from the ventilation channel of the conductor after detection, and supporting the accessory through air pressure so as to detach the cold-shrink or prefabricated cable accessory.
Compared with the prior art, the invention has the beneficial effects that:
firstly, the simulation cable for the cable accessory test is used for the medium-voltage cable accessory factory test, can be equivalent to the structural function of an actual cable, can realize the disassembly and assembly of a product test, and improves the efficiency of the product factory test; the structure is compact and simple, the installation is convenient, the device is suitable for factory standardized production, and the manufacturing cost is low; the problems of difficult installation, low test efficiency and high cost of a factory test of medium-voltage cold shrinkage or prefabricated cable accessories are well solved.
Secondly, by adopting the technical scheme, the conductor is designed into a hollow high-voltage conductor through surface treatment, and forms good combination with an insulating protective layer such as an epoxy insulating layer, so that the partial discharge level of the cable is kept in good condition when the high voltage is accessed, and high-voltage nitrogen or inert gas can be accessed for auxiliary cable accessory installation; meanwhile, the problems of quick installation of cable accessories (middle connectors) and connection of high-voltage electrodes are solved through the cooperation of the male connector and the female connector.
Thirdly, the product of the technical scheme of the invention has excellent electrical performance, meets the electrical performance requirements of national standards, and completely meets the use requirements of cable accessory tests.
Drawings
Fig. 1 is a schematic structural view of a first dummy cable member according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a second dummy cable member according to an embodiment of the present invention.
Fig. 3 is a schematic cross-sectional structure of a dummy cable body according to an embodiment of the present invention.
Fig. 4 is a schematic view of the structure of a first and second dummy cable members connected to form a dummy cable according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a structure for detecting a mounted cable accessory of a simulation cable according to an embodiment of the present invention.
The reference numerals include: 1-simulation cable body, 11-conductor, 12-insulation protection layer, 13-shielding layer, 14-ventilation channel and 15-composite conductive elastic material layer; 2-first dummy cable components, 3-second dummy cable components, 4-cold shrink or pre-made cable terminals, 5-cold shrink or pre-made cable intermediate portions, 100-first dummy cable bodies, 200-connection male, 210-male gas passages, 220-connectors, 300-fixed connectors, 400-second dummy cable bodies, 500-connection female, 510-female gas passages, 520-grooves.
Detailed Description
Preferred embodiments of the present invention are described in further detail below.
As shown in fig. 1 to 5, a simulation cable for a cable accessory test comprises a simulation cable body 1, wherein the simulation cable body 1 sequentially comprises a conductor 11, an insulating protective layer 12 and a shielding layer 13 from inside to outside, and a ventilation channel 14 is arranged in the middle of the conductor 11 of the simulation cable body 1;
the simulation cable for the cable accessory test comprises a first simulation cable component 2 and a second simulation cable component 3, wherein the first simulation cable component 2 comprises a first simulation cable body 100 and a connection male 200, one end of the first simulation cable body 100 is connected with the connection male 200, and the other end of the first simulation cable body 100 is provided with a fixed connector 300; the second simulation cable member 3 comprises a second simulation cable body 400 and a connection female 500 matched with the connection male 200, one end of the second simulation cable body 400 is connected with the connection female 500, and the other end of the second simulation cable body 400 is provided with a fixed connector 300; the male connector 200 is provided with a male gas channel 210 and a male gas outlet, the male gas channel 210 is communicated with the ventilation channel 14 of the first simulation cable body 100, and the male gas outlet is communicated with the male gas channel 210;
the connecting female 500 is provided with a female gas channel 510 and a female gas outlet, the female gas channel 510 is communicated with the ventilation channel 14 of the second simulation cable body 400, and the female gas outlet is communicated with the female gas channel 510.
The insulating protection layer 12 is made of epoxy resin. After the surface of the conductor 11 is subjected to sand blasting, a composite conductive elastic material layer 15 is coated, and the composite conductive elastic material layer 15 is connected with the insulating protection layer 12. The shielding layer 13 is made of conductive epoxy resin.
The head of the male connector 200 is provided with a connector 220, the middle of the female connector 500 is provided with a groove 520, and the connector 220 is connected with the groove 520 through threads.
As shown in fig. 4 and 5, the detection of the cable accessory by using the simulation cable for the cable accessory test includes the following steps:
step S1, the connection male head 200 of the first simulation cable component 2 and the connection female head 500 of the second simulation cable component 3 are matched with each other to form a complete simulation cable;
and S2, mounting the cold-shrink or prefabricated cable accessory on the simulation cable, filling nitrogen from the ventilation channel 14 of the conductor 11 during mounting, supporting the accessory by air pressure, mounting the cold-shrink or prefabricated cable terminal 4 at two ends of the simulation cable, mounting the middle part 5 of the cold-shrink or prefabricated cable at the connection position of the connection male head 200 and the connection female head 500 of the simulation cable, stopping filling air, connecting the conductor 11 with a high-voltage equipment source for factory test, filling nitrogen from the ventilation channel 14 of the conductor 11 after detection, and supporting the accessory by air pressure so as to detach the cold-shrink or prefabricated cable accessory.
According to the scheme of the invention, nitrogen is filled into the ventilation channel in the center of the conductor when the accessory is assembled and disassembled, the accessory is supported by nitrogen pressure, so that the accessory can be assembled and disassembled quickly, the installation is convenient, and the accessory cannot be damaged.
Taking the cable accessory test of 8.7/15kV system as an example, the simulation cable adopting the invention and the result pair of the common cable test are shown in table 1.
TABLE 1
As can be seen from the comparison of Table 1, the test of the cable accessories is carried out by adopting the simulation cable of the invention and the common cable which is conventionally installed, and the test result by adopting the simulation cable is basically no difference from the test result by adopting the common cable, thereby meeting the standard requirement.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (6)
1. A simulation cable for cable accessory test, its characterized in that: the cable comprises a simulation cable body, wherein the simulation cable body sequentially comprises a conductor, an insulating protective layer and a shielding layer from inside to outside, and a ventilation channel is formed in the middle of the conductor of the simulation cable body;
the simulation cable for the cable accessory test comprises a first simulation cable component and a second simulation cable component, wherein the first simulation cable component comprises a first simulation cable body and a connection male head, one end of the first simulation cable body is connected with the connection male head, and a fixed connecting piece is arranged at the other end of the first simulation cable body; the second simulation cable component comprises a second simulation cable body and a connection female head matched with the connection male head, one end of the second simulation cable body is connected with the connection female head, and a fixed connecting piece is arranged at the other end of the second simulation cable body;
the male connector is provided with a male connector gas channel and a male connector gas outlet, the male connector gas channel is communicated with the ventilation channel of the first simulation cable body, and the male connector gas outlet is communicated with the male connector gas channel;
the connecting female is provided with a female gas channel and a female gas outlet, the female gas channel is communicated with the ventilation channel of the second simulation cable body, and the female gas outlet is communicated with the female gas channel;
the insulating protective layer is made of epoxy resin;
the surface of the conductor is provided with a conductive elastic material layer which is connected with the insulating protective layer.
2. The simulated cable for a cable attachment test of claim 1, wherein: after the surface of the conductor is subjected to sand blasting, a composite conductive elastic material layer is coated on the surface of the conductor.
3. The simulated cable for a cable attachment test of claim 1, wherein: the head of the connecting male head is provided with a connecting piece, the middle part of the connecting female head is provided with a groove, and the connecting piece is clamped with the groove or connected with the groove through threads.
4. A simulation cable for a cable accessory test according to any one of claims 1 to 3, characterized in that: the shielding layer is made of conductive epoxy resin.
5. A simulation cable for a cable accessory test according to any one of claims 1 to 3, characterized in that: the female head gas outlet is positioned at the head of the female head gas channel, and the male head gas outlet is positioned at the head of the male head gas channel; after the connecting female head is matched with the connecting male head, a gap is reserved between the female head gas outlet and the male head gas outlet.
6. The detection method of the cable accessory is characterized by comprising the following steps of: the test using the simulation cable for the cable accessory test as defined in any one of claims 1 to 5, comprising the steps of:
step S1, the connection male head of a first simulation cable component and the connection female head of a second simulation cable component are matched with each other to form a complete simulation cable;
and S2, mounting the cold-shrink or prefabricated cable accessory on the simulation cable, filling nitrogen or inert gas from a ventilation channel of the conductor during mounting, supporting the accessory through air pressure, mounting the cold-shrink or prefabricated cable terminal at two ends of the simulation cable, mounting the middle of the cold-shrink or prefabricated cable at the connection position of the connection male head and the connection female head of the simulation cable, stopping filling air, connecting the conductor with a high-voltage equipment source for factory test, filling nitrogen or inert gas from the ventilation channel of the conductor after detection, and supporting the accessory through air pressure so as to detach the cold-shrink or prefabricated cable accessory.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710551888.1A CN107274981B (en) | 2017-07-07 | 2017-07-07 | Simulation cable for cable accessory test and detection method of cable accessory |
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| CN201710551888.1A CN107274981B (en) | 2017-07-07 | 2017-07-07 | Simulation cable for cable accessory test and detection method of cable accessory |
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| CN107274981A CN107274981A (en) | 2017-10-20 |
| CN107274981B true CN107274981B (en) | 2023-07-11 |
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| CN110007179B (en) * | 2018-10-25 | 2021-04-30 | 童志勇 | Cable intermediate joint electrical performance testing tool and method |
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| JPH08233885A (en) * | 1995-02-28 | 1996-09-13 | Toshiba Corp | Testing apparatus |
| JP2013046549A (en) * | 2011-08-26 | 2013-03-04 | Swcc Showa Cable Systems Co Ltd | Plug-in bushing and dielectric strength test method |
| CN203337774U (en) * | 2013-07-31 | 2013-12-11 | 长园电力技术有限公司 | Test device for cable accessory of 220kV and above |
| CN104201622A (en) * | 2014-09-11 | 2014-12-10 | 江苏安靠智能输电工程科技股份有限公司 | Prefabricated power cable intermediate joint mounting device and method |
| CN104535910A (en) * | 2015-01-12 | 2015-04-22 | 国网上海市电力公司 | Integrated terminal device used for power cable step-by-step puncture test |
| CN207068498U (en) * | 2017-07-07 | 2018-03-02 | 长园电力技术有限公司 | A kind of artificial mains network for cable accessory experiment |
-
2017
- 2017-07-07 CN CN201710551888.1A patent/CN107274981B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08233885A (en) * | 1995-02-28 | 1996-09-13 | Toshiba Corp | Testing apparatus |
| JP2013046549A (en) * | 2011-08-26 | 2013-03-04 | Swcc Showa Cable Systems Co Ltd | Plug-in bushing and dielectric strength test method |
| CN203337774U (en) * | 2013-07-31 | 2013-12-11 | 长园电力技术有限公司 | Test device for cable accessory of 220kV and above |
| CN104201622A (en) * | 2014-09-11 | 2014-12-10 | 江苏安靠智能输电工程科技股份有限公司 | Prefabricated power cable intermediate joint mounting device and method |
| CN104535910A (en) * | 2015-01-12 | 2015-04-22 | 国网上海市电力公司 | Integrated terminal device used for power cable step-by-step puncture test |
| CN207068498U (en) * | 2017-07-07 | 2018-03-02 | 长园电力技术有限公司 | A kind of artificial mains network for cable accessory experiment |
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