CN107402343B - Capacitance type high-voltage cable joint partial discharge built-in sensor structure - Google Patents
Capacitance type high-voltage cable joint partial discharge built-in sensor structure Download PDFInfo
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- CN107402343B CN107402343B CN201710680119.1A CN201710680119A CN107402343B CN 107402343 B CN107402343 B CN 107402343B CN 201710680119 A CN201710680119 A CN 201710680119A CN 107402343 B CN107402343 B CN 107402343B
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- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011889 copper foil Substances 0.000 claims abstract description 9
- 238000005260 corrosion Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 12
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 238000009413 insulation Methods 0.000 description 14
- 238000001514 detection method Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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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
- G01R31/1263—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a capacitance type high-voltage cable joint partial discharge built-in sensor structure, which comprises a sensor and a high-voltage cable, wherein the sensor is arranged in the high-voltage cable joint; the sensor is cylindric, has set gradually from inside to outside: the sensor comprises a dielectric film, a copper foil electrode, a buffer layer and a metal shell, wherein the copper foil electrode is tightly adhered to the dielectric film to form a sensor electrode; a radio frequency cable connector is arranged on the sensor; the high-voltage cable is sequentially provided with a conductive wire core, an inner semi-conductive layer, an insulating layer, an outer semi-conductive layer, a semi-conductive water-blocking tape, a corrugated aluminum sheath, an anti-corrosion layer and an outer sheath from inside to outside; the periphery of the inner semi-conductive layer is connected with the dielectric film; one end of the sensor is connected with a connector with a spiral structure inside, and the spiral structure inside the connector is matched with the corrugated aluminum sheath of the high-voltage cable; the periphery of the corrugated aluminum sheath is connected with the internal spiral structure of the connector. The invention improves the sensitivity of monitoring the partial discharge of the high-voltage cable, is durable and is very convenient to mount and dismount.
Description
Technical Field
The invention relates to the field of electrical equipment partial discharge detection instruments, in particular to a capacitive high-voltage cable joint partial discharge built-in sensor structure.
Background
With the development of economy, stable operation of power has received national attention, and partial discharge monitoring has been a non-destructive item for inspecting insulation of a cable, and the degree of aging of the cable is judged by the partial discharge monitoring.
The cable intermediate joint is a high-voltage part of an insulation accident, and therefore, cable accessories become a weak link of high-voltage cable line insulation and a typical part of operation faults. The electrical insulation performance of the cable accessories, the quality of the cable, the influence of the cable during laying, the installation process, the environmental influence and the like can cause the operation fault of the cable. Once a fault occurs, a certain economic loss is caused.
At present, partial discharge monitoring is mainly carried out through sensing devices such as a capacitive sensor, an inductive sensor and an antenna sensor in China, but the partial discharge monitoring has certain problems and is not high in detection precision. The external sensor is interfered by external electromagnetic signals, so that the external sensor is low in detection sensitivity and poor in anti-interference capability, and cannot be applied to online monitoring for a long time.
Therefore, the technical personnel in the field are dedicated to develop a built-in sensor structure for partial discharge of a capacitive high-voltage cable connector, which has high monitoring precision and can be applied to monitoring the aging degree of a high-voltage cable for a long time.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a sensor structure with a partial discharge built-in for a capacitive high-voltage cable connector.
In order to achieve the aim, the invention provides a capacitance type high-voltage cable joint partial discharge built-in sensor structure, which comprises a sensor and a high-voltage cable, wherein the sensor is arranged in a shell;
the sensor is cylindric, has set gradually from inside to outside: the sensor comprises a dielectric film, a copper foil electrode, a buffer layer and a metal shell, wherein the copper foil electrode is tightly adhered to the dielectric film to form a sensor electrode; a radio frequency cable connector is arranged on the sensor;
the high-voltage cable is sequentially provided with a conductive wire core, an inner semi-conductive layer, an insulating layer, an outer semi-conductive layer, a semi-conductive water-blocking tape, a corrugated aluminum sheath, an anti-corrosion layer and an outer sheath from inside to outside; the periphery of the inner semi-conducting layer is connected with the medium film;
one end of the sensor is connected with a connector of which the interior is of a spiral structure, and the spiral structure in the connector is matched with a corrugated aluminum sheath of the high-voltage cable; the periphery of the corrugated aluminum sheath is connected with the internal spiral structure of the connector.
Preferably, a short-circuit cap is arranged on the radio frequency cable connector.
Preferably, the metal shell comprises a first shell and a second shell which are connected with each other in a semi-circular cylindrical shape, a first protruding portion is arranged in the middle of one end of the first shell in the length direction, a first concave portion is arranged in the middle of the other end of the first shell, a first middle screw hole is formed in the first protruding portion along the length direction of the first shell, and a first front end screw hole and a first rear end screw hole are respectively formed in the first shell along the length direction of the first shell on two sides of the first concave portion;
a second bulge is arranged in the middle of one end of the second shell in the length direction, a second concave part is arranged in the middle of the other end of the second shell, a second middle screw hole is formed in the second bulge along the length direction of the second shell, and a second front end screw hole and a second rear end screw hole are respectively formed in the second shell along the length direction of the second shell on two sides of the second concave part;
the first bulge is matched with the second concave part, and the first middle screw hole, the second front end screw hole and the second rear end screw hole form a communicating screw hole with the same thread;
the second bulge is matched with the first concave part, and the second middle screw hole is communicated with the first front end screw hole and the first rear end screw hole through the same threads.
Preferably, the connector is provided with a clamping groove at one end of the sensor along the circumferential direction, and the sensor is provided with a clamping part matched with the clamping groove at one end of the connector.
Preferably, the buffer layer is tightly adhered to the metal shell.
Preferably, the dielectric film is made of polytetrafluoroethylene material, the buffer layer is made of silicon rubber material, and the metal shell is made of aluminum material.
The invention has the beneficial effects that: the invention improves the sensitivity of monitoring the partial discharge of the high-voltage cable, is durable and is very convenient to mount and dismount.
Drawings
Fig. 1 is a schematic diagram of a sensor structure.
Fig. 2 is a sectional view of fig. 1.
Fig. 3 is an enlarged schematic view of a portion a in fig. 2.
Fig. 4 is a top view of fig. 1.
Fig. 5 is a schematic view of the first housing structure.
Fig. 6 is a schematic view of a second housing structure.
Fig. 7 is an equivalent circuit schematic of the present invention.
Fig. 8 is a cross-sectional view of a high voltage cable.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1 to 4, a capacitive high-voltage cable joint partial discharge built-in sensor structure comprises a sensor 1 and a high-voltage cable 2.
The sensor 1 is cylindrical and is sequentially provided with: the sensor comprises a dielectric film 3, a copper foil electrode 4, a buffer layer 5 and a metal shell 6, wherein the copper foil electrode 4 is tightly adhered with the dielectric film 3 to form a complete sensor 1 electrode.
The buffer layer 5 is tightly adhered with the metal shell 6 to form a whole body which is convenient to take and use; buffer layer 5 wraps up in the electrode outside, with copper foil electrode 4 in close contact with, guarantees that the cable can both let electrode and cable in close contact with when operation with not moving.
The medium film 3 is made of polytetrafluoroethylene material and has excellent performances of high temperature resistance, corrosion resistance and the like. The buffer layer 5 is made of silicon rubber material, has excellent high-temperature resistance, and ensures that the buffer layer does not have performance reduction caused by high temperature when the cable runs. The metal shell 6 is made of aluminum material, so that the metal shell 6 and the corrugated aluminum sheath are made of the same material, and the contact resistance and loss between the metal shell and the corrugated aluminum sheath are reduced.
The metal shell 6 is formed by connecting a first shell 6a and a second shell 6b which are in a semicircular-arc cylindrical shape and are matched with each other, a first protruding portion 10 is arranged in the middle of one end of the first shell 6a in the length direction, a first concave portion 11 is arranged in the middle of the other end of the first shell 6a in the matching mode, and a first middle screw hole 12 is formed in the first protruding portion 10 in the length direction of the first shell 6 a. On both sides of the first recess 11, a first front end screw hole 13a and a first rear end screw hole 13b are provided in the first housing 6a along the longitudinal direction of the first housing 6a, respectively.
A second boss 14 is arranged in the middle of one end of the second housing 6b in the length direction, a second concave portion 15 is arranged in the middle of the other end of the second housing 6b, a second middle screw hole 16 is arranged on the second boss 14 along the length direction of the second housing 6b, and a second front end screw hole 17a and a second rear end screw hole 17b are respectively arranged on the second housing 6b along the length direction of the second housing 6b on two sides of the second concave portion 15.
When the first shell 6a and the second shell 6b are closed, the first protruding part 10 is just embedded into the second concave part 15, the first middle screw hole 12, the second front end screw hole 17a and the second rear end screw hole 17b form a communication screw hole with the same thread, and a screw matched with the thread is inserted into the communication screw hole, so that one side of the first shell 6a and one side of the second shell 6b are connected.
Meanwhile, the second protruding portion 14 is just embedded into the first concave portion 11, the second middle screw hole 16 forms a communication screw hole with the same thread as the first front end screw hole 13a and the first rear end screw hole 13b, and a screw matched with the thread is inserted into the communication screw hole, so that the connection of the other sides of the first casing 6a and the second casing 6b is realized, and thus, the first casing 6a and the second casing 6b are connected into the cylindrical metal shell 6.
The sensor 1 is provided with a radio frequency cable connector 8, in this embodiment a TNC connector, for connecting to external observation processing equipment.
Be provided with short circuit cap 9 on the TNC connects, open short circuit cap 9, the TNC connects and can be connected with outside observation treatment facility. When not in use, the short circuit cap 9 is covered on the TNC connector, and the suspension potential is prevented from occurring when the high-voltage cable runs. Meanwhile, the short-circuit cap 9 can isolate the inside of the sensor 1 from the outside, so that moisture is prevented from entering the sensor 1 and affecting measurement.
The high-voltage cable 2 is provided with a conductive wire core 21, an inner semi-conductive layer 22, an insulating layer 23, an outer semi-conductive layer 24, a semi-conductive water-blocking tape 25, a corrugated aluminum sheath 26, an anti-corrosion layer 27 and an outer sheath 28 in sequence from inside to outside. The outer layer material of the joint of the high-voltage cable 2 is stripped to the inner semi-conductive layer 22, and the sensor 1 is sleeved outside the inner semi-conductive layer 22 and connected with the medium film 3.
One end of the sensor 1 is connected with a connector 7 with a spiral structure inside, one end of the sensor 1 of the connector 7 is provided with an engaging groove 18 along the circumferential direction, one end of the connector 7 of the sensor 1 is provided with an engaging part 19 matched with the engaging groove 18, the engaging groove 18 and the engaging part 19 are engaged, and the sensor 1 and the connector 7 are connected into a whole.
The internal spiral structure of the connector 7 is matched with a corrugated aluminum sheath 26 of the high-voltage cable 2, the outer layer material is stripped to the corrugated aluminum sheath 26 at the position of the connector of the high-voltage cable 2 which is close to the end where the inner semi-conducting layer 22 is stripped, the connector 7 is sleeved outside the corrugated aluminum sheath 26, and the periphery of the corrugated aluminum sheath 26 is connected with the internal spiral structure of the connector 7.
The present embodiment has an equivalent circuit as shown in fig. 7.
Suppose that: outer diameter D of cable insulation layer1Inner diameter D of cable insulation layer0Dielectric constant in vacuum0Relative dielectric constant of insulating materialr. The capacitance between the sensor electrode and the cable core can then be calculated as follows:
in the formula:
0vacuum dielectric constant, value 8.85 × 10-12F/m；
rThe relative dielectric constant of the insulating material, for X L PE, has a value of 2.3;
D1-the outer diameter of the cable insulation;
D0inner diameter of the cable insulation.
Suppose that: relative permeability mu of insulating material of insulating layerr，
Then the inductance per unit length in the cable can be calculated as follows:
in the formula:
μ0magnetic permeability in vacuum, value 4 π × 10-7H/m；
μrThe relative permeability of the insulating material;
D1-the outer diameter of the cable insulation;
D0inner diameter of the cable insulation.
Thus, the characteristic impedance of the cable can be calculated as follows:
suppose that: the cable length is l, the resistivity of the cable insulation is p,
the insulation resistance of the cable can be calculated as follows
In the formula (I), the compound is shown in the specification,
rho-resistivity of cable insulation, crosslinked polyethylene about 1014～1015Ω·m；
l-cable length;
D1-the outer diameter of the cable insulation;
D0inner diameter of the cable insulation.
Referring to fig. 7, it can be found that when there is a discharge signal in the cable core, the transfer function of the sensor coupling detection signal is:
it can be seen that the main influence factors on the power frequency voltage division at lower frequency are R and RSThe power frequency high voltage is mainly at R, and the detection system has only small voltage drop.
For signals with higher frequency, such as discharge signals, the main influence on the transfer function is C and CSThe ratio of (a) to (b). From the sensor structure, it can be seen that the two capacitance values are related to the size of the electrodes in the sensor and the length of the stripped shielding layer, so adjusting the electrode size can further optimize the performance of the sensor.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (5)
1. A capacitance type high-voltage cable connector partial discharge built-in sensor structure is characterized in that: comprises a sensor (1) and a high-voltage cable (2);
the sensor (1) is cylindrical and is sequentially provided with the following components from inside to outside: the sensor comprises a dielectric film (3), a copper foil electrode (4), a buffer layer (5) and a metal shell (6), wherein the copper foil electrode (4) is tightly adhered to the dielectric film (3) to form an electrode of the sensor (1); a radio frequency cable joint (8) is arranged on the sensor (1);
the high-voltage cable (2) is sequentially provided with a conductive wire core (21), an inner semi-conductive layer (22), an insulating layer (23), an outer semi-conductive layer (24), a semi-conductive water-blocking tape (25), a corrugated aluminum sheath (26), an anti-corrosion layer (27) and an outer sheath (28) from inside to outside; the outer periphery of the outer semi-conductive layer (24) is connected with the dielectric film (3);
one end of the sensor (1) is connected with a connector (7) with a spiral structure inside, and the spiral structure inside the connector (7) is matched with a corrugated aluminum sheath (26) of the high-voltage cable (2); the periphery of the corrugated aluminum sheath (26) is connected with the internal spiral structure of the connector (7);
the connector (7) in sensor (1) one end is equipped with block groove (18) along the circumferencial direction, sensor (1) in connector (7) one end be equipped with block portion (19) of block groove (18) complex.
2. The capacitive high voltage cable joint partial discharge built-in sensor structure of claim 1, wherein: and a short circuit cap (9) is arranged on the radio frequency cable joint (8).
3. The capacitive high voltage cable joint partial discharge built-in sensor structure of claim 1, wherein: the metal shell (6) comprises a first shell (6a) and a second shell (6b) which are connected with each other in a semi-circular cylindrical mode, a first protruding portion (10) is arranged in the middle of one end of the first shell (6a) in the length direction, a first concave portion (11) is arranged in the middle of the other end of the first shell, a first middle screw hole (12) is formed in the first protruding portion (10) along the length direction of the first shell (6a), and a first front end screw hole (13a) and a first rear end screw hole (13b) are formed in the first shell (6a) along the length direction of the first shell (6a) on two sides of the first concave portion (11);
a second bulge (14) is arranged in the middle of one end of the second shell (6b) in the length direction, a second concave part (15) is arranged in the middle of the other end of the second shell, a second middle screw hole (16) is formed in the second bulge (14) along the length direction of the second shell (6b), and a second front end screw hole (17a) and a second rear end screw hole (17b) are respectively formed in the second shell (6b) along the length direction of the second shell (6b) on two sides of the second concave part (15);
the first bulge (10) is matched with the second concave part (15), and the first middle screw hole (12), the second front end screw hole (17a) and the second rear end screw hole (17b) form a communicating screw hole with the same thread;
the second protruding portion (14) is matched with the first concave portion (11), and the second middle screw hole (16) and the first front end screw hole (13a) and the first rear end screw hole (13b) form a communicating screw hole with the same threads.
4. The capacitive high voltage cable joint partial discharge built-in sensor structure of claim 1, wherein: the buffer layer (5) is tightly adhered to the metal shell (6).
5. The capacitive high voltage cable joint partial discharge built-in sensor structure of claim 1, wherein: the medium film (3) is made of polytetrafluoroethylene materials, the buffer layer (5) is made of silicon rubber materials, and the metal shell (6) is made of aluminum materials.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710680119.1A CN107402343B (en) | 2017-08-10 | 2017-08-10 | Capacitance type high-voltage cable joint partial discharge built-in sensor structure |
| PCT/CN2018/099698 WO2019029638A1 (en) | 2017-08-10 | 2018-08-09 | Partial discharge built-in sensor structure of capacitance high-voltage cable joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710680119.1A CN107402343B (en) | 2017-08-10 | 2017-08-10 | Capacitance type high-voltage cable joint partial discharge built-in sensor structure |
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| Publication Number | Publication Date |
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| CN107402343A CN107402343A (en) | 2017-11-28 |
| CN107402343B true CN107402343B (en) | 2020-07-28 |
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| CN201710680119.1A Expired - Fee Related CN107402343B (en) | 2017-08-10 | 2017-08-10 | Capacitance type high-voltage cable joint partial discharge built-in sensor structure |
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| CN (1) | CN107402343B (en) |
| WO (1) | WO2019029638A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402343B (en) * | 2017-08-10 | 2020-07-28 | 中国电力科学研究院有限公司 | Capacitance type high-voltage cable joint partial discharge built-in sensor structure |
| CN110261744B (en) * | 2019-06-25 | 2021-08-31 | 深圳供电局有限公司 | Partial discharge detection device |
| CN110618351B (en) * | 2019-09-27 | 2021-11-16 | 湖南大学 | Capacitance sensor and detection device |
| CN111623850B (en) * | 2020-06-16 | 2022-04-26 | 南京沃天科技有限公司 | Liquid level transmitter waterproof sealing structure |
| CN112986769A (en) * | 2021-03-31 | 2021-06-18 | 西安博源电气有限公司 | Cable built-in type partial discharge detection sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201561989U (en) * | 2009-03-25 | 2010-08-25 | 北京兴迪仪器有限责任公司 | Built-in device of local discharge sensor |
| CN102096027A (en) * | 2010-11-15 | 2011-06-15 | 华北电力大学 | Pre-embedded sensor for local discharge detection of power cable accessory |
| CN202486165U (en) * | 2012-03-22 | 2012-10-10 | 北京市电力公司 | Sensor and cable connecting device |
| CN103344886A (en) * | 2013-05-28 | 2013-10-09 | 国家电网公司 | Sensor for partial discharge detection of XLPE power cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666849B (en) * | 2009-09-28 | 2011-06-01 | 西安交通大学 | Online monitoring device of partial discharge of high-voltage cable joint and online monitoring method thereof |
| CN103278755B (en) * | 2013-05-28 | 2015-10-21 | 国家电网公司 | Sensor for partial discharge detection of XLPE power cable installation method |
| CN105044565A (en) * | 2015-08-31 | 2015-11-11 | 国网青海省电力公司西宁供电公司 | Capacitor type ring network cable partial discharge sensor |
| CN107402343B (en) * | 2017-08-10 | 2020-07-28 | 中国电力科学研究院有限公司 | Capacitance type high-voltage cable joint partial discharge built-in sensor structure |
-
2017
- 2017-08-10 CN CN201710680119.1A patent/CN107402343B/en not_active Expired - Fee Related
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2018
- 2018-08-09 WO PCT/CN2018/099698 patent/WO2019029638A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201561989U (en) * | 2009-03-25 | 2010-08-25 | 北京兴迪仪器有限责任公司 | Built-in device of local discharge sensor |
| CN102096027A (en) * | 2010-11-15 | 2011-06-15 | 华北电力大学 | Pre-embedded sensor for local discharge detection of power cable accessory |
| CN202486165U (en) * | 2012-03-22 | 2012-10-10 | 北京市电力公司 | Sensor and cable connecting device |
| CN103344886A (en) * | 2013-05-28 | 2013-10-09 | 国家电网公司 | Sensor for partial discharge detection of XLPE power cable |
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| 唐炬 等.检测电缆附件局部放电内置传感器的特性分析.《重庆大学学报》.2008,第31卷(第7期),第760-765页. * |
| 检测电缆附件局部放电内置传感器的特性分析;唐炬 等;《重庆大学学报》;20080731;第31卷(第7期);第760-765页 * |
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| WO2019029638A1 (en) | 2019-02-14 |
| CN107402343A (en) | 2017-11-28 |
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