CN111292943B - GIS type semi-casting external current transformer and GIS equipment - Google Patents
GIS type semi-casting external current transformer and GIS equipment Download PDFInfo
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- CN111292943B CN111292943B CN201811489081.0A CN201811489081A CN111292943B CN 111292943 B CN111292943 B CN 111292943B CN 201811489081 A CN201811489081 A CN 201811489081A CN 111292943 B CN111292943 B CN 111292943B
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- current transformer
- gis
- dustcoat
- type semi
- external current
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- 238000005266 casting Methods 0.000 title abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 82
- 239000012212 insulator Substances 0.000 claims abstract description 31
- 210000002421 cell wall Anatomy 0.000 claims 1
- 239000006260 foam Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 10
- 230000009286 beneficial effect Effects 0.000 description 16
- 238000005187 foaming Methods 0.000 description 9
- 239000003822 epoxy resin Substances 0.000 description 8
- 229920000647 polyepoxide Polymers 0.000 description 8
- 238000009413 insulation Methods 0.000 description 6
- 239000004593 Epoxy Substances 0.000 description 3
- 239000003566 sealing material Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
- H01F38/30—Constructions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/0356—Mounting of monitoring devices, e.g. current transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention relates to a GIS type semi-casting external current transformer and GIS equipment. This GIS equipment includes the external current transformer of half pouring of GIS type, the external current transformer of half pouring of GIS type includes cross-core bus casing and current transformer dustcoat, cross-core bus casing and current transformer dustcoat constitute the cavity that is used for holding the coil together, the junction pouring on cross-core bus casing and current transformer dustcoat upper portion has sealed insulator, install the kuppe on the current transformer dustcoat, be equipped with the elastic sealing element who is the annular and arranges between the upper portion of sealed insulator and cross-core bus casing or the current transformer dustcoat, sealing element and sealed insulator are at cross-core bus casing footpath sealed cooperation of sealing. The GIS equipment can be used for solving the problem that the GIS type half-pouring external current transformer in the GIS equipment in the prior art is likely to cause moisture to enter a cavity where a coil is positioned and further influence the measurement precision due to the sealing failure of the connection position of the current transformer outer cover and the straight-through bus shell.
Description
Technical Field
The invention relates to a GIS type semi-casting external current transformer and GIS equipment.
Background
With the continuous development of economic society, a Gas Insulated Switchgear (GIS) is increasingly applied, particularly in the high-voltage field (72.5kV and above), with the advantages of small floor space, long maintenance period, high safety and reliability, and the like. The current transformer in the GIS equipment is an important monitoring device in an electric power system, mainly used for monitoring the current circulating in the equipment, and the measurement precision of the current transformer is easily influenced by external factors, so that the influence of the external factors on the current transformer is avoided, and the necessary measure for ensuring the normal operation of the GIS equipment is provided.
A chinese patent document CN205194492U, published in 2016, month 4 and day 27, describes a current transformer, which includes a coil 101, the coil 101 is installed in a cavity formed by a feedthrough bus bar housing 102 and a current transformer housing 103, an insulation partition 104 formed by epoxy resin is cast at the connection between the feedthrough bus bar housing 102 and the current transformer housing 103, the insulation partition 104 can be used for connecting the feedthrough bus bar housing 102 and the current transformer housing 103 and also used for insulation and sealing, and a dome 105 is further installed on the current transformer housing 103, as shown in fig. 1.
Although the air guide sleeve 105 in the current transformer can prevent most of rainwater, a small amount of rainwater still enters a rainproof space formed by the current transformer outer cover 103, the air guide sleeve 105 and the through bus shell 102, and the rainwater enters the rainproof space to increase the humidity of air in the rainproof space; insulating differentiation 104 is formed by epoxy casting, and epoxy solidifies the back and takes place expend with heat and contract with cold by the environmental impact, probably can appear some regions and break away from the condition of current transformer dustcoat 103 and/or punching bus casing 102, will cause the sealed inefficacy of the cavity at coil 101 place like this, and then leads to the moisture in the rain-proof space to get into the cavity at coil place and influence current transformer's measurement accuracy.
Disclosure of Invention
The invention aims to provide a GIS type semi-poured external current transformer which is used for solving the problem that the current transformer in the prior art is likely to cause moisture to enter a cavity where a coil is positioned and further influence the measurement precision due to the sealing failure of the connection part of an outer cover of the current transformer and a shell of a straight-through bus; the invention also provides GIS equipment for solving the problem that the measurement precision is influenced because moisture enters a cavity of a coil because the current transformer in the GIS equipment in the prior art is likely to lose the sealing property at the joint of the current transformer outer cover and the feed-through bus shell.
In order to achieve the purpose, the GIS type semi-casting external current transformer adopts the following technical scheme: this external current transformer of half pouring of GIS type includes punch-through bus casing and current transformer dustcoat, punch-through bus casing and current transformer dustcoat constitute a cavity that is used for holding the coil together, the junction pouring on punch-through bus casing and current transformer dustcoat upper portion has sealed insulator, install the kuppe on the current transformer dustcoat, be equipped with the elastic sealing element who is the annular and arranges between the upper portion of sealed insulator and punch-through bus casing or the current transformer dustcoat, elastic sealing element and sealed insulator are at punch-through bus casing footpath sealed cooperation.
The invention has the beneficial effects that: the air guide sleeve, the current transformer outer cover and the feed-through bus shell form a rainproof space together, the feed-through bus shell and the current transformer outer cover form a cavity for accommodating a coil together, a sealing insulator for sealing insulation is poured at the joint of the upper parts of the feed-through bus shell and the current transformer outer cover, partial area of the sealing insulator is probably separated from the feed-through bus shell and/or the current transformer outer cover due to expansion with heat and contraction with cold after solidification, so that the cavity where the coil is located is sealed and fails, and by additionally arranging the elastic sealing element, when the sealing insulator is separated from the feed-through bus shell and/or the current transformer outer cover, the separation part of the sealing insulator from the feed-through bus shell and/or the current transformer outer cover cannot form a gap due to extrusion of the elastic sealing element, and moist air in the rainproof space cannot enter the cavity where the coil is located, therefore, the measurement precision of the GIS type semi-casting external current transformer cannot be influenced.
Further, the elastic sealing element is an elastic sealing strip.
The beneficial effects of the improvement are as follows: a common elastomeric seal is provided.
Furthermore, the elastic sealing strip is clamped on the upper edge of the current transformer outer cover, the elastic sealing strip is provided with a clamping groove clamped on the upper edge of the current transformer outer cover, and the groove wall on one side of the clamping groove is positioned between the current transformer outer cover and the sealing insulator and is in radial compression sealing fit with the sealing insulator on the straight-through bus shell.
The beneficial effects of the improvement are as follows: the elastic sealing strip is convenient to install, is directly clamped on the upper edge of the outer cover of the current transformer, and is simple to operate.
Further, an inner side sealing ring is arranged below the sealing insulator, and the inner side sealing ring is clamped between the feed-through bus shell and the current transformer outer cover.
The beneficial effects of the improvement are as follows: and a sealing structure is added to further prevent the sealing failure of the cavity where the coil is positioned.
Further, the inner sealing ring is surrounded by a foaming strip.
The beneficial effects of the improvement are as follows: provides a common sealing material with lower cost.
Furthermore, two respirators for absorbing moisture in the air in the cavity where the coil is located are mounted on the outer cover of the current transformer.
The beneficial effects of the improvement are as follows: moisture in the original air in the cavity where the coil is located is removed through a respirator, and the moisture in the original air is prevented from influencing the measurement precision of the GIS type semi-casting external current transformer.
Further, the breather is arranged diagonally on the current transformer housing.
The beneficial effects of the improvement are as follows: this arrangement allows the respirator to cover a greater amount of space while allowing the respirator to function better within the cavity.
Furthermore, the outer edge of one end of the flow guide cover connected with the current transformer outer cover is positioned on the outer side of the edge of the top surface of the current transformer outer cover.
The beneficial effects of the improvement are as follows: the arrangement can prevent rainwater from falling onto the top surface of the air guide sleeve, flowing onto the top surface of the current transformer outer cover, and then entering the air guide sleeve, the current transformer outer cover and the straight-through bus shell to form a rainproof space.
The GIS equipment of the invention has the technical scheme that: this GIS equipment includes half external current transformer and isolator of pouring of GIS type, half external current transformer of pouring of GIS type includes cross-core bus casing and current transformer dustcoat, cross-core bus casing and current transformer dustcoat constitute a cavity that is used for holding the coil together, the junction pouring on cross-core bus casing and current transformer dustcoat upper portion has sealed insulator, install the kuppe on the current transformer dustcoat, be equipped with the elastic sealing element who is the annular and arranges between the upper portion of sealed insulator and cross-core bus casing or the current transformer dustcoat, elastic sealing element and sealed insulator are at cross-core bus casing radial seal cooperation.
The beneficial effect who so sets up is: the air guide sleeve, the current transformer outer cover and the feed-through bus shell form a rainproof space together, the feed-through bus shell and the current transformer outer cover form a cavity for accommodating a coil together, a sealing insulator for sealing insulation is poured at the joint of the upper parts of the feed-through bus shell and the current transformer outer cover, partial area of the sealing insulator is probably separated from the feed-through bus shell and/or the current transformer outer cover due to expansion with heat and contraction with cold after solidification, so that the cavity where the coil is located is sealed and fails, and by additionally arranging the elastic sealing element, when the sealing insulator is separated from the feed-through bus shell and/or the current transformer outer cover, the separation part of the sealing insulator from the feed-through bus shell and/or the current transformer outer cover cannot form a gap due to extrusion of the elastic sealing element, and moist air in the rainproof space cannot enter the cavity where the coil is located, therefore, the measurement precision of the GIS type semi-casting external current transformer cannot be influenced.
Further, the elastic sealing element is an elastic sealing strip.
The beneficial effects of the improvement are as follows: by utilizing the elastic property of the elastic sealing strip, the sealing insulator is better pressed to seal gaps formed between the sealing insulator and the feed-through bus shell and/or the current transformer outer cover.
Furthermore, the elastic sealing strip is clamped on the upper edge of the current transformer outer cover, the elastic sealing strip is provided with a clamping groove clamped on the upper edge of the current transformer outer cover, and the groove wall on one side of the clamping groove is positioned between the current transformer outer cover and the sealing insulator and is in radial compression sealing fit with the sealing insulator on the straight-through bus shell.
The beneficial effects of the improvement are as follows: the elastic sealing strip is convenient to install, is directly clamped on the upper edge of the outer cover of the current transformer, and is simple to operate.
Further, an inner side sealing ring is arranged below the sealing insulator, and the inner side sealing ring is clamped between the feed-through bus shell and the current transformer outer cover.
The beneficial effects of the improvement are as follows: and a sealing structure is added to further prevent the sealing failure of the cavity where the coil is positioned.
Further, the inner sealing ring is surrounded by a foaming strip.
The beneficial effects of the improvement are as follows: provides a common sealing material with lower cost.
Furthermore, two respirators for absorbing moisture in the air in the cavity where the coil is located are mounted on the outer cover of the current transformer.
The beneficial effects of the improvement are as follows: moisture in the original air in the cavity where the coil is located is removed through a respirator, and the moisture in the original air is prevented from influencing the measurement precision of the GIS type semi-casting external current transformer.
Further, the breather is arranged diagonally on the current transformer housing.
The beneficial effects of the improvement are as follows: this arrangement allows the respirator to cover a greater amount of space while allowing the respirator to function better within the cavity.
Furthermore, the outer edge of one end of the flow guide cover connected with the current transformer outer cover is positioned on the outer side of the edge of the top surface of the current transformer outer cover.
The beneficial effects of the improvement are as follows: the arrangement can prevent rainwater from falling onto the top surface of the air guide sleeve, flowing onto the top surface of the current transformer outer cover, and then entering the air guide sleeve, the current transformer outer cover and the straight-through bus shell to form a rainproof space.
Drawings
Fig. 1 is a schematic structural view of a current transformer described in the background art;
fig. 2 is a schematic structural diagram of a GIS type half-cast external current transformer in embodiment 1 of the GIS device according to the present invention;
fig. 3 is an enlarged view of a region a in a GIS-type half-cast external current transformer in embodiment 1 of the GIS apparatus according to the present invention;
in the attached figure 1: 101-coil, 102-penetrating bus shell, 103-current transformer outer cover, 104-insulation division, 105-air guide sleeve, 1-coil, 2-penetrating bus shell, 3-current transformer outer cover, 4-air guide sleeve, 5-epoxy resin, 6-elastic sealing strip, 7-foaming strip, 8-isolating switch, 9-respirator, 31-turned edge, 32-top surface outer edge and 41-lower end outer edge.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in fig. 2 and fig. 3, an embodiment 1 of the GIS device according to the present invention includes a GIS type half-cast external current transformer and a disconnector 8, where the GIS type half-cast external current transformer includes a feedthrough bus bar housing 2 and a current transformer housing 3, the feedthrough bus bar housing 2 and the current transformer housing 3 together form a cavity, and a coil 1 is installed in the cavity; the kuppe 4 of connecting isolator 8 and current transformer dustcoat 3 is installed at the top of current transformer dustcoat 3, and kuppe 4 is used for the water conservancy diversion between isolator 8 and the current transformer dustcoat 3, can also be rain-proof simultaneously, and the lower extreme of kuppe 4 is followed 41 outward and is in the outside along 32 of the top surface of current transformer dustcoat 3 to prevent along the rainwater that kuppe 4 flows down on the top surface of current transformer dustcoat 3. Of course, in other embodiments, the lower outer edge of the air guide sleeve can be positioned inside the outer edge of the top surface of the current transformer housing, and the same can be used.
As shown in fig. 2 and 3, one end of the current transformer housing 3 close to the feedthrough bus bar housing 2 is provided with an upward extending turned edge 31, a circle of foaming strip 7 is installed between the turned edge 31 and the feedthrough bus bar housing 2, the foaming strip 7 forms an inner side sealing ring, a circle of elastic sealing strip 6 is installed on the upper edge of the turned edge 31, the elastic sealing strip 6 forms an elastic sealing element, the lower part of the elastic sealing strip 6 is arranged in a clamping groove shape, so that the elastic sealing strip 6 can be clamped on the upper edge of the turned edge 31 of the current transformer housing 3, the foaming strip 7, the turned edge 31, the elastic sealing strip 6 and the feedthrough bus bar housing together form a containing space, epoxy resin 5 is poured in the containing space, the epoxy resin forms a sealing insulator, the epoxy resin 5 can contract the elastic sealing strip 6 and generate an elastic force when pouring, the generated elastic force can make the elastic sealing strip 6 press against the epoxy resin 5 in reverse direction, epoxy 5 mainly plays insulating sealing effect, prevents to have the current circulation between current transformer dustcoat 3 and the punch-through bus casing 2, still prevents that the moisture in the space that kuppe 4, current transformer dustcoat 3 and punch-through bus casing 2 constitute from getting into the cavity at coil place in, and then influences GIS type half external current transformer's of pouring measurement accuracy. Of course, in other embodiments, the elastic sealing strip may also be an elastic sealing ring as long as it can satisfy the requirement of compressing the epoxy resin; the elastic sealing strip can be directly arranged on the turned edge of the outer cover of the current transformer in a bonding mode without arranging a clamping groove; in addition, the elastic sealing strip can also be arranged between the feed-through bus shell and the epoxy resin, and the requirements are met; the foaming strip is used for further increasing the sealing effect of the cavity, and the foaming strip is not arranged in other embodiments; the foaming strip can also be replaced by other sealing materials, and the requirements are met.
Two respirators 9 are also mounted on the current transformer housing 3, wherein one respirator 9 is arranged on the top face of the current transformer housing 3, and the other respirator 9 is arranged on the side wall of the current transformer housing 3 and is arranged diagonally to the transformer 9 arranged on the top face of the current transformer housing 3. Since respirators are common tools for removing moisture from air, the detailed structure thereof will not be described herein. Of course, in other embodiments, the respirators may be arranged not diagonally, and may be arranged at any position of the current transformer housing as long as the moisture in the cavity can be removed; the number of the respirators can be other than two, three, four and the like; in other embodiments, no breather is arranged and the use of the GIS type semi-cast external current transformer is not affected.
The invention also provides a GIS type half-cast external current transformer, the specific structure of which is the same as that of the GIS type half-cast external current transformer in the embodiment 1 of the GIS device, and the detailed description is omitted here.
Claims (7)
1. The utility model provides a GIS type semi-pouring external current transformer, includes punch-through bus casing and current transformer dustcoat, and punch-through bus casing and current transformer dustcoat constitute a cavity that is used for holding the coil together, and the junction on punch-through bus casing and current transformer dustcoat upper portion pours into has sealed insulator, installs the kuppe on the current transformer dustcoat, and characterized by is equipped with the elastic sealing element who is the annular and arranges between the upper portion of sealed insulator and punch-through bus casing or the current transformer dustcoat, and elastic sealing element and sealed insulator are at punch-through bus casing footpath sealed cooperation, elastic sealing element is the elastic sealing strip, the elastic sealing strip clamps on the reason of going up of current transformer dustcoat, the draw-in groove of card on the reason of going up of current transformer dustcoat has to one side cell wall of draw-in groove is in between current transformer dustcoat and the sealed insulator and with.
2. The GIS type semi-poured external current transformer according to claim 1, wherein an inner sealing ring is provided under the sealing insulator, and the inner sealing ring is sandwiched between the feedthrough bus bar housing and the current transformer outer case.
3. The GIS-type semi-poured external current transformer according to claim 2, wherein said inner sealing ring is surrounded by a foam strip.
4. The GIS type semi-poured external current transformer according to claim 1, wherein two respirators are mounted on the current transformer housing for absorbing moisture from the air in the cavity in which the coil is located.
5. The GIS-type semi-poured external current transformer according to claim 4, wherein said breather is diagonally disposed on the current transformer housing.
6. The GIS-type semi-poured external current transformer according to claim 1, wherein the outer edge of the lower end of the air guide sleeve connected with the outer cover of the current transformer is positioned outside the outer edge of the top surface of the outer cover of the current transformer.
7. A GIS device comprising a GIS type semi-poured external current transformer and an isolating switch, characterized in that the GIS type semi-poured external current transformer is the GIS type semi-poured external current transformer of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811489081.0A CN111292943B (en) | 2018-12-06 | 2018-12-06 | GIS type semi-casting external current transformer and GIS equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811489081.0A CN111292943B (en) | 2018-12-06 | 2018-12-06 | GIS type semi-casting external current transformer and GIS equipment |
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| Publication Number | Publication Date |
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| CN111292943A CN111292943A (en) | 2020-06-16 |
| CN111292943B true CN111292943B (en) | 2021-06-29 |
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| CN201811489081.0A Active CN111292943B (en) | 2018-12-06 | 2018-12-06 | GIS type semi-casting external current transformer and GIS equipment |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007194234A (en) * | 2006-01-17 | 2007-08-02 | Chugoku Electric Power Co Inc:The | Method for preventing leakage of insulation oil at terminal portion of power apparatus |
| CN201465788U (en) * | 2009-07-24 | 2010-05-12 | 中国西电电气股份有限公司 | Current transformer for GIS |
| CN205194492U (en) * | 2015-10-30 | 2016-04-27 | 河南平芝高压开关有限公司 | Current inducer |
| CN107248448A (en) * | 2017-06-19 | 2017-10-13 | 河南平高电气股份有限公司 | A kind of GIS external current mutual inductors and GIS device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09148154A (en) * | 1995-11-27 | 1997-06-06 | Sumitomo Wiring Syst Ltd | Ignition coil and manufacture thereof |
| CN201773689U (en) * | 2009-12-28 | 2011-03-23 | 上海卓高电气有限公司 | 110 kV partial discharge-free three-phase electromagnetic voltage transformer |
| EP3239997A1 (en) * | 2016-04-25 | 2017-11-01 | ABB Schweiz AG | A hv apparatus and a method of manufacturing such apparatus |
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2018
- 2018-12-06 CN CN201811489081.0A patent/CN111292943B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007194234A (en) * | 2006-01-17 | 2007-08-02 | Chugoku Electric Power Co Inc:The | Method for preventing leakage of insulation oil at terminal portion of power apparatus |
| CN201465788U (en) * | 2009-07-24 | 2010-05-12 | 中国西电电气股份有限公司 | Current transformer for GIS |
| CN205194492U (en) * | 2015-10-30 | 2016-04-27 | 河南平芝高压开关有限公司 | Current inducer |
| CN107248448A (en) * | 2017-06-19 | 2017-10-13 | 河南平高电气股份有限公司 | A kind of GIS external current mutual inductors and GIS device |
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| CN111292943A (en) | 2020-06-16 |
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