CN109342901B - Wall bushing with insulation state on-line monitoring function and working method thereof - Google Patents
Wall bushing with insulation state on-line monitoring function and working method thereof Download PDFInfo
- Publication number
- CN109342901B CN109342901B CN201811421630.0A CN201811421630A CN109342901B CN 109342901 B CN109342901 B CN 109342901B CN 201811421630 A CN201811421630 A CN 201811421630A CN 109342901 B CN109342901 B CN 109342901B
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- layer
- wall bushing
- voltage
- shielding layer
- line monitoring
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- 238000009413 insulation Methods 0.000 title claims abstract description 28
- 238000012544 monitoring process Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000006698 induction Effects 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims abstract 2
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000005684 electric field Effects 0.000 claims description 10
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 3
- 238000004364 calculation method Methods 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
Abstract
The invention relates to a wall bushing with an insulation state on-line monitoring function, which comprises a wall bushing body, wherein a high-voltage bus is arranged in an inner cavity of the wall bushing body in a penetrating manner, a high-voltage shielding layer, an induction layer and a grounding shielding layer are sequentially arranged on the pipe wall of the wall bushing body in a nested manner from inside to outside, a first insulation layer is arranged between the high-voltage shielding layer and the induction layer, a second insulation layer is arranged between the induction layer and the grounding shielding layer, the induction layer is connected with a piezoelectric signal detection device through a first wire, and the grounding shielding layer is grounded through a second wire; the invention also relates to a working method of the wall bushing with the insulation state on-line monitoring function. The invention has the advantages of simple and reasonable structural design, leakage current detection function, on-line monitoring of the insulation state of the wall bushing body, easy operation, high efficiency, convenience and wide application prospect.
Description
Technical Field
The invention relates to a wall bushing with an insulation state on-line monitoring function and a working method thereof.
Background
After the conventional wall bushing is used for decades, the wall bushing is easy to break down due to ageing of materials, the ground short circuit fault is caused, the power supply is interrupted, and the power equipment is lost, so that the wall bushing has great limitation.
Disclosure of Invention
In view of the defects of the prior art, the technical problem to be solved by the invention is to provide the wall bushing with the insulation state on-line monitoring function and the working method thereof, which are reasonable in structural design, efficient and convenient.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a wall bushing with insulating state on-line monitoring function, includes the wall bushing body, the inner chamber of wall bushing body is worn to be equipped with high-voltage bus, the pipe wall of wall bushing body is nested in proper order from inside to outside to be provided with high-voltage shielding layer, inductive layer and ground shield layer, be provided with first insulating layer between high-voltage shielding layer and the inductive layer, be provided with the second insulating layer between inductive layer and the ground shield layer, the inductive layer is connected with the low-voltage electrical signal check out test set through first wire, the ground shield layer is grounded through the second wire.
Furthermore, the wall bushing body is formed by pouring epoxy resin.
Further, the high-voltage shielding layer, the induction layer and the grounding shielding layer are all made of copper alloy meshes.
Further, the thickness of the first insulating layer is greater than the thickness of the second insulating layer.
Furthermore, the high-voltage shielding layer, the induction layer and the grounding shielding layer are all annular and concentrically arranged.
Further, the heights of the high-voltage shielding layer, the induction layer and the grounding shielding layer are gradually reduced from inside to outside.
Further, a third insulating layer is arranged between the high-voltage shielding layer and the inner side wall of the wall bushing body, and a fourth insulating layer is arranged between the grounding shielding layer and the outer side wall of the wall bushing body.
Further, the low-voltage electric signal detection device comprises a voltmeter.
Further, the middle part of wall bushing body is provided with mounting flange, high voltage shielding layer, induction layer and ground shield layer set up the side at mounting flange, first wire and second wire pass mounting flange.
The working method of the wall bushing with the insulation state on-line monitoring function comprises the following steps of: a first capacitor C1 is formed between the grounding shielding layer and the sensing layer, a second capacitor C2 is formed between the sensing layer and the high-voltage shielding layer, the leakage current of the high-voltage bus and the high-voltage electric field of the high-voltage bus are affected, an electric signal is induced between the high-voltage shielding layer and the grounding shielding layer, the voltage is divided by the first capacitor C1 and the second capacitor C2, the low-voltage electric signal obtained between the sensing layer and the grounding shielding layer is detected by the low-voltage electric signal detection equipment through a first lead, when the inside of the wall bushing body changes, the value of the first capacitor C1 and the value of the second capacitor C2 change, the output low-voltage electric signal changes, and accordingly the insulation performance of the wall bushing body can be detected to change.
Compared with the prior art, the invention has the following beneficial effects: the invention has the advantages of simple and reasonable structural design, leakage current detection function, on-line monitoring of the insulation state of the wall bushing body, easy operation, high efficiency, convenience and wide application prospect.
The invention will be described in further detail with reference to the drawings and the detailed description.
Drawings
Fig. 1 is a schematic view of the construction of an embodiment of the present invention.
In the figure: 1-wall bushing body, 101-inner cavity, 102-pipe wall, 2-high voltage shielding layer, 3-induction layer, 4-ground shielding layer, 5-first insulating layer, 6-second insulating layer, 7-first wire, 8-second wire, 9-third insulating layer, 10-fourth insulating layer, 11-mounting flange.
Detailed Description
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1, a wall bushing with insulation state on-line monitoring function, including wall bushing body 1, wall bushing body 1's inner chamber 101 wears to be equipped with high-voltage bus, wall bushing body 1's pipe wall 102 is nested from inside to outside to be provided with high-voltage shielding layer 2, induction layer 3 and ground shield layer 4 in proper order, be provided with first insulating layer 5 between high-voltage shielding layer 2 and the induction layer 3, be provided with second insulating layer 6 between induction layer 3 and the ground shield layer 4, induction layer 3 is connected with piezoelectric signal detection equipment through first wire 7, ground shield layer 4 is grounded through second wire 8.
In the embodiment of the invention, the wall bushing body 1 is formed by pouring epoxy resin.
In the embodiment of the invention, the high-voltage shielding layer 2, the induction layer 3 and the grounding shielding layer 4 are all made of copper alloy mesh.
In the embodiment of the present invention, the thickness of the first insulating layer 5 is greater than the thickness of the second insulating layer 6.
In the embodiment of the present invention, the high voltage shielding layer 2, the sensing layer 3 and the grounding shielding layer 4 are all annular and concentrically arranged.
In the embodiment of the invention, the heights of the high-voltage shielding layer 2, the induction layer 3 and the grounding shielding layer 4 gradually decrease from inside to outside.
In the embodiment of the invention, a third insulating layer 9 is disposed between the high-voltage shielding layer 2 and the inner side wall of the wall bushing body 1, and a fourth insulating layer 10 is disposed between the ground shielding layer 4 and the outer side wall of the wall bushing body 1.
In an embodiment of the present invention, the low-voltage electrical signal detection device includes a voltmeter.
In the embodiment of the invention, the middle part of the wall bushing body 1 is provided with a mounting flange 11, the high-voltage shielding layer 2, the induction layer 3 and the grounding shielding layer 4 are arranged beside the mounting flange 11, the first conducting wire 7 and the second conducting wire 8 penetrate through the mounting flange 11, and the first conducting wire 7 and the second conducting wire 8 are mutually insulated.
In the embodiment of the invention, a working method of a wall bushing with an insulation state on-line monitoring function comprises any one of the wall bushing with the insulation state on-line monitoring function, and the working method comprises the following steps: a first capacitor C1 is formed between the grounding shielding layer 4 and the sensing layer 3, a second capacitor C2 is formed between the sensing layer 3 and the high-voltage shielding layer 2, the leakage current of the high-voltage bus and the high-voltage electric field of the high-voltage bus are affected by the leakage current of the high-voltage bus and the high-voltage electric field of the high-voltage bus, at the moment, the leakage current of the high-voltage bus and the high-voltage electric field of the high-voltage bus are in a safe range, an electric signal is induced between the high-voltage shielding layer 2 and the grounding shielding layer 4, the voltage is divided by the first capacitor C1 and the second capacitor C2, a low-voltage electric signal obtained between the sensing layer 3 and the grounding shielding layer 4 is detected by a low-voltage electric signal detecting device through a first lead 7, when the inside of the wall bushing body 1 is mutated, the leakage current of the high-voltage bus and the high-voltage electric field of the high-voltage bus exceed the safe range, the values of the first capacitor C1 and the second capacitor C2 are changed, the output low-voltage electric signal is changed, and accordingly the insulation performance of the wall bushing body 1 can be detected.
The specific calculation and analysis process of the invention is as follows:
calculation formula of cylindrical capacitance value
Pi is the circumference rate, epsilon is the dielectric constant of epoxy resin, L is the upper and lower width of a shorter polar plate (the grounding shielding layer, the induction layer and the high-voltage shielding layer are made of the same conductor material and are collectively called as polar plates), R is the radius of the polar plate, and t is the thickness of an insulating layer between two polar plates
From the above formula, it can be seen that: as t increases, C decreases, and as R increases, C increases, and a proper radius and thickness are set according to actual conditions, so that the capacitance of the second insulating layer 6 (hereinafter, C 6 ) Capacitance with the first insulating layer 5 (hereinafter referred to as C 5 ) The proportion is as follows:
the capacitance reactance calculation method comprises the following steps:
if C is to be 6 And C 5 Designed as a ratio of 99:1, C 6 Capacitive reactance X at 50Hz frequency 6 And C 5 Capacitive reactance X at 50Hz 5 Proportion ofThe method comprises the following steps:
the system voltage is provided by a voltage transformer of the PT cabinet and is set as UN, C 6 The voltage at both ends is U 6 Here U 6 For the low-voltage electrical signal detection device to detect the electrical signal obtained between the sensing layer 3 and the ground shield layer 4 via the first wire 7, then:
when the insulating layer is slightly damaged, part of the insulation is broken down to become a conductor, the total thickness of the insulating layer is determined during manufacture and is not changed, and part of the insulation failure causes the effective thickness t of the insulating medium to be reduced (the thickness t=t of the insulating medium in a capacitance calculation formula Effective and effective ＝t Manufacturing -t Breakdown of ) The capacitance C is increased, and the capacitance X is reduced;
in general, the electric field strength in the C6 medium is inconsistent with that in the C5 medium, and the first insulating layer 5 has stronger electric field due to the C5 being close to the center and cannot be damaged in proportion, which leads to the change of the proportion of X6 to X5 and further toThe damage of U6 is different from the U6 when the insulation is normal;
in a more common situation, the first insulating layer 5 with higher electric field strength breaks down first, the second insulating layer 6 does not break down, at this time, X5 is reduced, X6 is unchanged, and U6 is increased;
sometimes, the second insulating layer 6 with low electric field strength breaks down first due to the defect of the insulating layer, the first insulating layer 5 is unchanged, at the moment, X6 is reduced, X5 is unchanged, and U6 is reduced;
because of manufacturing errors of each batch, the output of each sleeve is different, and the initial output voltage is recorded as a judgment basis for the on-line detection at the later time when the sleeve is used for the first time.
Terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape are meant to include a state or shape that is similar, analogous or approaching thereto, unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (8)
1. The utility model provides a wall bushing with insulating state on-line monitoring function which characterized in that: the high-voltage bus is arranged in an inner cavity of the wall bushing body in a penetrating manner, a high-voltage shielding layer, an induction layer and a grounding shielding layer are sequentially arranged on the pipe wall of the wall bushing body in a nested manner from inside to outside, a first insulating layer is arranged between the high-voltage shielding layer and the induction layer, a second insulating layer is arranged between the induction layer and the grounding shielding layer, the induction layer is connected with a low-voltage electric signal detection device through a first wire, and the grounding shielding layer is grounded through a second wire;
a third insulating layer is arranged between the high-voltage shielding layer and the inner side wall of the wall bushing body, and a fourth insulating layer is arranged between the grounding shielding layer and the outer side wall of the wall bushing body;
the middle part of wall bushing body is provided with mounting flange, high-voltage shielding layer, induction layer and ground shield layer set up the side at mounting flange, first wire and second wire pass mounting flange.
2. The wall bushing with insulation state on-line monitoring function according to claim 1, wherein: the wall bushing body is formed by pouring epoxy resin.
3. The wall bushing with insulation state on-line monitoring function according to claim 1, wherein: the high-voltage shielding layer, the induction layer and the grounding shielding layer are all made of copper alloy meshes.
4. The wall bushing with insulation state on-line monitoring function according to claim 1, wherein: the thickness of the first insulating layer is greater than that of the second insulating layer.
5. The wall bushing with insulation state on-line monitoring function according to claim 1, wherein: the high-voltage shielding layer, the induction layer and the grounding shielding layer are all annular and concentrically arranged.
6. The wall bushing with insulation state on-line monitoring function according to claim 1, wherein: the heights of the high-voltage shielding layer, the induction layer and the grounding shielding layer are gradually reduced from inside to outside.
7. The wall bushing with insulation state on-line monitoring function according to claim 1, wherein: the low voltage electrical signal detection apparatus includes a voltmeter.
8. A working method of a wall bushing with an insulation state on-line monitoring function, comprising the wall bushing with the insulation state on-line monitoring function as set forth in any one of claims 1 to 7, characterized by comprising the following steps: a first capacitor C1 is formed between the grounding shielding layer and the sensing layer, a second capacitor C2 is formed between the sensing layer and the high-voltage shielding layer, the leakage current of the high-voltage bus and the high-voltage electric field of the high-voltage bus are affected, an electric signal is induced between the high-voltage shielding layer and the grounding shielding layer, the voltage is divided by the first capacitor C1 and the second capacitor C2, the low-voltage electric signal obtained between the sensing layer and the grounding shielding layer is detected by the low-voltage electric signal detection equipment through a first lead, when the inside of the wall bushing body changes, the value of the first capacitor C1 and the value of the second capacitor C2 change, the output low-voltage electric signal changes, and accordingly the insulation performance of the wall bushing body can be detected to change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811421630.0A CN109342901B (en) | 2018-11-27 | 2018-11-27 | Wall bushing with insulation state on-line monitoring function and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811421630.0A CN109342901B (en) | 2018-11-27 | 2018-11-27 | Wall bushing with insulation state on-line monitoring function and working method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109342901A CN109342901A (en) | 2019-02-15 |
| CN109342901B true CN109342901B (en) | 2024-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811421630.0A Active CN109342901B (en) | 2018-11-27 | 2018-11-27 | Wall bushing with insulation state on-line monitoring function and working method thereof |
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| CN (1) | CN109342901B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098583B (en) * | 2019-05-14 | 2021-10-08 | 云南电网有限责任公司电力科学研究院 | Wall bushing and preparation method thereof |
| CN110932207B (en) * | 2019-12-18 | 2021-10-29 | 国网福建省电力有限公司 | Combined cable fixing and plugging device and working method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6351202B1 (en) * | 1998-12-01 | 2002-02-26 | Mitsubishi Denki Kabushiki Kaisha | Stationary induction apparatus |
| CN201118163Y (en) * | 2007-08-22 | 2008-09-17 | 熊江咏 | Through-wall sleeve possessing shield |
| CN103296620A (en) * | 2012-03-01 | 2013-09-11 | 上海旭然电器有限公司 | Wall feed-through sleeve with high-low voltage shielding |
| KR101457535B1 (en) * | 2014-05-02 | 2014-11-04 | 대원계전주식회사 | Extra-high voltage high strength solid insulation epoxy wall through bushing and closed type distribution board |
| CN105514892A (en) * | 2016-01-27 | 2016-04-20 | 云南电网有限责任公司电力科学研究院 | Wall bushing provided with shielding structure |
| CN207719768U (en) * | 2017-12-21 | 2018-08-10 | 扬州发运电气有限公司 | A kind of composite dry-type wall bushing |
| CN209446719U (en) * | 2018-11-27 | 2019-09-27 | 福州天宇电气股份有限公司 | Wall bushing with state of insulation on-line monitoring function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8547112B2 (en) * | 2010-03-29 | 2013-10-01 | Eduardo Pedrosa Santos | Introduced in monitoring system of dielectric state of high voltage equipments with capacitive insulation, such as condensive bushings, current transformers, potential transformers and similar |
-
2018
- 2018-11-27 CN CN201811421630.0A patent/CN109342901B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6351202B1 (en) * | 1998-12-01 | 2002-02-26 | Mitsubishi Denki Kabushiki Kaisha | Stationary induction apparatus |
| CN201118163Y (en) * | 2007-08-22 | 2008-09-17 | 熊江咏 | Through-wall sleeve possessing shield |
| CN103296620A (en) * | 2012-03-01 | 2013-09-11 | 上海旭然电器有限公司 | Wall feed-through sleeve with high-low voltage shielding |
| KR101457535B1 (en) * | 2014-05-02 | 2014-11-04 | 대원계전주식회사 | Extra-high voltage high strength solid insulation epoxy wall through bushing and closed type distribution board |
| CN105514892A (en) * | 2016-01-27 | 2016-04-20 | 云南电网有限责任公司电力科学研究院 | Wall bushing provided with shielding structure |
| CN207719768U (en) * | 2017-12-21 | 2018-08-10 | 扬州发运电气有限公司 | A kind of composite dry-type wall bushing |
| CN209446719U (en) * | 2018-11-27 | 2019-09-27 | 福州天宇电气股份有限公司 | Wall bushing with state of insulation on-line monitoring function |
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| CN109342901A (en) | 2019-02-15 |
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