CN203275576U - Sensor used for XLPE power cable partial discharge detection - Google Patents
Sensor used for XLPE power cable partial discharge detection Download PDFInfo
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- CN203275576U CN203275576U CN 201320298841 CN201320298841U CN203275576U CN 203275576 U CN203275576 U CN 203275576U CN 201320298841 CN201320298841 CN 201320298841 CN 201320298841 U CN201320298841 U CN 201320298841U CN 203275576 U CN203275576 U CN 203275576U
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- power cable
- xlpe power
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- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 65
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 65
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 14
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- 229920006267 polyester film Polymers 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
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- 210000001503 joint Anatomy 0.000 description 6
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- 230000002349 favourable effect Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
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- 238000009413 insulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012945 sealing adhesive Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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- 238000007789 sealing Methods 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
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Abstract
The utility model relates to a sensor used for XLPE power cable partial discharge detection. The SENSOR is formed on an outer surface of an annular insulating layer of an XLPE power cable accessory in a seamless welding manner, so as to beneficial for spread of ultrahigh frequency signals. The sensor prevents damaging original insulativity and electric field distribution of the XLPE power cable accessory while improving detection accuracy of the XLPE power cable partial discharge. An UHF sensor after the seamless welding can effectively prevent corona or suspension discharge phenomena, and can greatly improve accuracy of the XLPE power cable partial discharge detection. More importantly, the UHF sensor is in sheet shape, and can be cut and installed on site according to thickness of the XLPE power cable accessory, thereby greatly simplifying installation process, improving working efficiency, reducing manufacturing and use cost, and greatly enhancing versatility.
Description
Technical Field
The utility model relates to a XLPE power cable partial discharge detects uses sensor belongs to XLPE power cable partial discharge and detects technical field.
Background
Compared with the traditional overhead line power supply, the power supply of the XLPE (crosslinked polyethylene) power cable has the advantages of no influence of external environment, land saving, good electrical performance and the like. With the development of urban power grids, the utilization rate of the XLPE power cable is continuously improved, and the operation reliability of the XLPE power cable is concerned by power departments.
The cable has many reasons for faults, and through the statistical analysis of the operation faults of the cable, the faults are found to occur in the middle joint of the cable and the area nearby the middle joint. Because a large number of composite interfaces and electric field stress concentration phenomena exist in the middle joint, and the middle joint is installed and manufactured on site, the quality and the service life of the middle joint are greatly dependent on the manufacturing process and manual experience; the production level of field producers is not uniform, and due to artificial production factors, if the intermediate joints produced by the field producers are not too close, the possibility of potential quality hazards is higher. Because the power failure time of the faults is long, the repair is difficult, a large amount of material resources and manpower are wasted, the power failure loss which is difficult to estimate is brought, and partial discharge is often the main expression form of the cable joint fault in the early stage, so the partial discharge detection of the intermediate joint becomes the key point in the XLPE power cable discharge detection.
From the current inspection of XLPE power cables, it is common knowledge to implement partial discharge inspection techniques. The method has the advantages that partial discharge of key parts of the cable is effectively detected, the state information of the cable can be accurately acquired, the state maintenance level of the cable is improved, and the safe and stable operation of the cable is ensured. The cable structure and the operation environment are special, so that the partial discharge of the intermediate joint of the XLPE power cable is difficult to effectively detect, high-frequency current and ultrahigh-frequency electromagnetic waves are generated when the intermediate joint of the XLPE power cable generates partial discharge, and the partial discharge detection can be realized by utilizing a corresponding sensor to receive signals at a proper position.
Chinese patent document CN102096027A discloses a pre-buried sensor for detecting partial discharge of a power cable, which comprises a buffer layer, a ring electrode, a connecting cable, a leading-out terminal and a signal conditioning unit, wherein the buffer layer surrounds the outer side of the insulation of power cable accessories, and the inner side of the insulation of the power cable accessories is not in direct contact with a semi-conducting layer; the annular electrode surrounds the outer side of the buffer layer; the connecting cable is connected with the annular electrode through impedance matching and is used for connecting the annular electrode and the leading-out terminal; the leading-out terminal is fixedly connected with an opening on the power cable accessory shell; the leading-out terminal is connected with the signal conditioning unit. The ring electrode of the above patent document must be manufactured in advance according to the thickness of the cable accessory to be attached when used, or if the inner diameter of the ring electrode is too large, the ring electrode cannot be attached by being fitted, and if the inner diameter of the ring electrode is too small, the ring electrode is not convenient to use. Therefore, different ring electrodes need to be designed for cable accessories with different thicknesses, and the embedded sensor for detecting partial discharge of the power cable accessory disclosed in the patent document has poor universality and high use cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that partial discharge detects sensor among the prior art because of the poor and high technical problem of use cost of commonality that uses ring electrode to a high XLPE power cable partial discharge of commonality detects uses sensor is provided.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme:
a XLPE power cable partial discharge detection sensor, comprising:
the UHF sensor is a sheet-shaped sensor and is formed on the outer surface of an annular band-shaped insulating layer of the XLPE power cable accessory through seamless welding. Wherein,
XLPE power cable annex by interior semi-conducting layer, insulating layer and two outer semi-conducting layers of including in proper order outside to, form in the interior semi-conducting layer and hold the holding part that XLPE power cable core connects, the insulating layer is cyclic annular parcel is in the interior semi-conducting layer outside, two the cyclic annular parcel of outer semi-conducting layer is in just be located respectively in the insulating layer outside the tip of insulating layer, two be naked annular band-shaped insulating layer between the outer semi-conducting layer.
And one end of the leading-out cable is connected with the UHF sensor, and the other end of the leading-out cable is connected with the leading-out terminal.
The exposed annular band-shaped insulating layer of the XLPE power cable accessory is further provided with a stress buffer layer, and the UHF sensor is annularly wrapped around the outer side of the stress buffer layer.
The UHF sensor is a red copper sensor.
Also included is a grounded copper mesh grounding both of the outer semiconductive layers.
The UHF sensor further comprises a waterproof adhesive tape layer wound on the two outer semi-conducting layers and the outer surface of the UHF sensor.
The waterproof sealing adhesive tape is characterized by further comprising a protective copper shell arranged outside the waterproof adhesive tape layer and a waterproof sealing adhesive layer poured in a space formed by the waterproof adhesive tape layer and the inner wall of the protective copper shell.
The stress buffer layer is an elastic insulating medium layer.
The elastic insulating medium layer is a polyester film layer with the thickness of 25 um.
Compared with the prior art, the technical scheme of the utility model have following advantage:
(1) a XLPE power cable partial discharge detects uses sensor, adopt seamless welded form to form at the surface of the banded insulating layer of XLPE power cable annex ring, be favorable to the propagation of superfrequency signal like this promptly, when improving the accuracy that detects XLPE power cable partial discharge, can avoid destroying original insulating nature and the electric field distribution of XLPE power cable annex again. The UHF sensor after seamless welding can effectively avoid corona or suspension discharge phenomena, and can greatly improve the accuracy of partial discharge detection of the XLPE power cable. More importantly, the utility model provides a UHF sensor itself is flaky, can tailor and install according to the thickness scene of XLPE power cable annex, can portably the installation greatly, improves work efficiency, reduces and makes and use cost for the commonality strengthens greatly.
(2) A XLPE power cable sensor for partial discharge detection, have the thick polyester rete of 25um between UHF sensor and XLPE power cable intermediate head, the collapse of the UHF sensor that leads to when can effectively avoid XLPE power cable intermediate head to take place expend with heat and contract with cold bursts. And the dielectric constant of the 25um thick polyester film stress buffer layer is close to that of the insulating layer 3, so that the UHF sensor 5 can better exert the sensing sensitivity.
(3) A XLPE power cable sensor for partial discharge detection the protection copper shell that the outside on waterproof sticky tape layer set up and pour waterproof sticky tape layer with waterproof sealing glue film in the space of the inner wall formation of protection copper shell can effectively strengthen the performance and the waterproof performance that the UHF sensor resisted external striking.
Drawings
In order that the present invention may be more readily and clearly understood, reference will now be made in detail to the present invention, which is illustrated in the accompanying drawings,
fig. 1 is a schematic structural diagram of a sensor for detecting partial discharge of an XLPE power cable according to an embodiment of the present invention;
the reference numeral 1-XLPE power cable core connector, 2-inner semi-conducting layer, 3-insulating layer, 4-stress buffer layer and 5-UHF sensor.
Detailed Description
The structure of the sensor for detecting partial discharge of XLPE power cable according to an embodiment of the present invention is shown in fig. 1, which includes,
the UHF sensor 5, which is a sheet sensor, is formed on the outer surface of the annular band-shaped insulating layer 3 of the XLPE power cable accessory by seamless welding. Wherein,
XLPE power cable annex by interior to outer including setting up in the outside interior semi-conducting layer 2, insulating layer 3 and two outer semi-conducting layers of XLPE power cable core joint 1 in proper order, form in interior semi-conducting layer 2 and hold XLPE power cable core joint 1's portion of holding, 3 annular parcels of insulating layer are in interior semi-conducting layer 2 outsides, two the annular parcel of outer semi-conducting layer is in just be located respectively in the 3 outsides of insulating layer 3 the tip of insulating layer, two be naked annular band-shaped insulating layer 3 between the outer semi-conducting layer. Wherein, XLPE power cable annex in this embodiment indicates intermediate head, nevertheless XLPE power cable annex be not limited to intermediate head, still can be for the terminal.
And one end of the leading-out cable is connected with the UHF sensor 5, and the other end of the leading-out cable is connected with the leading-out terminal.
A XLPE power cable partial discharge detects uses sensor, adopt seamless welded form to form at the surface of the banded insulating layer of XLPE power cable annex ring, be favorable to the propagation of superfrequency signal like this promptly, when improving the accuracy that detects XLPE power cable partial discharge, can avoid destroying original insulating nature and the electric field distribution of XLPE power cable annex again. The UHF sensor 5 after seamless welding can effectively avoid corona or suspension discharge, and can greatly improve the accuracy of partial discharge detection of the XLPE power cable. More importantly, the utility model provides a UHF sensor 5 itself is flaky, can tailor and install according to the thickness scene of XLPE power cable annex, can portably the installation greatly, improves work efficiency, reduces to make and use cost hangs down for the commonality strengthens greatly.
As other embodiments, in the above embodiments, the exposed annular-band-shaped insulating layer 3 of the XLPE power cable accessory is further provided with the stress buffer layer 4, and the UHF sensor 5 is annularly wrapped around the outer side of the stress buffer layer 4, so that the cracking of the UHF sensor 5 caused by the thermal expansion and contraction of the XLPE power cable accessory can be effectively avoided.
As a specific implementation manner, the stress buffer layer 4 in the above embodiment is an elastic insulating medium layer, and the elastic insulating medium layer is a polyester film layer of 25um, so that cracking of the UHF sensor 5 caused by expansion with heat and contraction with cold of the intermediate joint of the XLPE power cable can be effectively avoided. And the dielectric constant of the 25um thick polyester film stress buffer layer 4 is close to that of the insulating layer 3, so that the UHF sensor 5 can better exert the sensing sensitivity. In other embodiments, a 50um or 75um thick polyester film, or other flexible dielectric layer, may also be used.
As a specific implementation manner, the UHF sensor 5 in the above embodiment is a red copper sensor. As other embodiments, the UHF sensor 5 may also be another bendable sensor, such as an aluminum sensor.
As a specific implementation manner, the above embodiment further includes a grounding copper net for grounding the two outer semi-conducting layers. As other examples, both of the outer semiconducting layers may also be grounded by other means, such as by a grounding wire.
As a specific implementation manner, the embodiment further includes a waterproof tape layer wound around the two outer semi-conductive layers and the outer surface of the UHF sensor 5, so that the two outer semi-conductive layers and the UHF sensor 5 are connected to the XLPE power cable accessory more firmly and have a waterproof function.
As other embodiments, the embodiment further includes a protective copper shell disposed outside the waterproof adhesive tape layer and a waterproof sealant layer poured in a space formed by the waterproof adhesive tape layer and the inner wall of the protective copper shell, so that the performance of the UHF sensor 5 against external impact and the waterproof performance can be effectively enhanced.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. A XLPE power cable partial discharge detection sensor, comprising:
the UHF sensor is a sheet sensor and is formed on the outer surface of an annular band-shaped insulating layer of the XLPE power cable accessory through seamless welding; wherein,
the XLPE power cable accessory sequentially comprises an inner semi-conducting layer, an insulating layer and two outer semi-conducting layers from inside to outside, a containing part for containing a core joint of the XLPE power cable is formed in the inner semi-conducting layer, the insulating layer is annularly wrapped on the outer side of the inner semi-conducting layer, the two outer semi-conducting layers are annularly wrapped on the outer side of the insulating layer and are respectively positioned at the end parts of the insulating layer, and an exposed annular strip-shaped insulating layer is arranged between the two outer semi-conducting layers;
and one end of the leading-out cable is connected with the UHF sensor, and the other end of the leading-out cable is connected with the leading-out terminal.
2. The XLPE power cable partial discharge detection sensor of claim 1, wherein the exposed annular insulating layer of the XLPE power cable accessory is further provided with a stress buffer layer, and the UHF sensor is annularly wrapped around the outside of the stress buffer layer.
3. The XLPE power cable partial discharge detection sensor as claimed in claim 1 or 2, wherein the UHF sensor is a red copper sensor.
4. The XLPE power cable partial discharge detection sensor according to claim 1 or 2, further comprising a grounding copper mesh for grounding the two outer semi-conductive layers.
5. The XLPE power cable partial discharge detection sensor as claimed in claim 1 or 2, further comprising a waterproof tape layer wound around the two outer semi-conductive layers and the outer surface of the UHF sensor.
6. The XLPE power cable partial discharge detection sensor according to claim 5, further comprising a protective copper case provided outside the waterproof tape layer and a waterproof sealant layer poured in a space formed by the waterproof tape layer and an inner wall of the protective copper case.
7. The XLPE power cable partial discharge detection sensor of claim 2, wherein the stress buffer layer is an elastic insulating dielectric layer.
8. The sensor for detecting partial discharge of XLPE power cable according to claim 7, wherein the elastic insulating medium layer is a polyester film layer with a thickness of 25 um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320298841 CN203275576U (en) | 2013-05-28 | 2013-05-28 | Sensor used for XLPE power cable partial discharge detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320298841 CN203275576U (en) | 2013-05-28 | 2013-05-28 | Sensor used for XLPE power cable partial discharge detection |
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| CN203275576U true CN203275576U (en) | 2013-11-06 |
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| CN 201320298841 Expired - Fee Related CN203275576U (en) | 2013-05-28 | 2013-05-28 | Sensor used for XLPE power cable partial discharge detection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344886A (en) * | 2013-05-28 | 2013-10-09 | 国家电网公司 | Sensor for partial discharge detection of XLPE power cable |
| CN108136838A (en) * | 2015-10-20 | 2018-06-08 | 大陆轮胎德国有限公司 | Cord and pneumatic vehicle tire |
-
2013
- 2013-05-28 CN CN 201320298841 patent/CN203275576U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344886A (en) * | 2013-05-28 | 2013-10-09 | 国家电网公司 | Sensor for partial discharge detection of XLPE power cable |
| CN108136838A (en) * | 2015-10-20 | 2018-06-08 | 大陆轮胎德国有限公司 | Cord and pneumatic vehicle tire |
| CN108136838B (en) * | 2015-10-20 | 2021-03-23 | 大陆轮胎德国有限公司 | Cord and pneumatic vehicle tire |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20200528 |