CA2162163A1 - A metal-enclosed high-voltage switching system with a current transformer - Google Patents
A metal-enclosed high-voltage switching system with a current transformerInfo
- Publication number
- CA2162163A1 CA2162163A1 CA002162163A CA2162163A CA2162163A1 CA 2162163 A1 CA2162163 A1 CA 2162163A1 CA 002162163 A CA002162163 A CA 002162163A CA 2162163 A CA2162163 A CA 2162163A CA 2162163 A1 CA2162163 A1 CA 2162163A1
- Authority
- CA
- Canada
- Prior art keywords
- tube
- metal
- voltage switching
- switching system
- current transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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
Abstract
In a current transformer (1) within a capsule housing (6) of a high-voltage switching metal-enclosed high-voltage switching system, between the secondary winding and the high-voltage line (10) there is a first tube, in particular a supporting tube (2) that is conductively connected at its first end with the capsule housing (6) and which at its second end is electrically connected to a second tube (8). The second tube lies against the inside wall of the capsule housing (6), with an insulating layer (9) between them. A closed conductive loop is avoided because of the insulating layer (9) and because of the fact that the second tube lies on the inside wall of the capsule housing the current transformer is effectively sealed against travelling waves within the capsule housing (6).
Description
o~ 3 ~ FILE, PtN*J THlS ~ME~ c~
TE~ TRANSLATI 216 A Metal-Enclosed High-Voltage Switching System with a Current Transformer The present invention relates to a metal-enclosed high voltage switch gear with a capsule-type housing and a current transformer that is arranged within this, the secondary winding of said transformer surrounding coaxially a high-voltage line, a first tube being arranged between the secondary winding of the current transformer and the high voltage line, the first end of said tube being connected electrically with the capsule-type housing and being electrically insulated from this at the remaining points.
A high-voltage switch gear of this kind is known, for example, from E 0 060 636 B1. In the high-voltage switching system gear described therein, a ring core current transformer is to be so shielded that no excess voltage occurs at the test terminals as a result of traveling waves within the capsule-type housing. An electrically-conductive shielding body that partially overlaps the tube so as to electrically insulate it in part, and which is connected to the capsule so as to be electrically conductive, is provided for this purpose.
It is the task of the present invention to simplify the construction of a metal-enclosed high-voltage switching system, to achieve good shielding for the current transformer, and reduce costs for installing the current transformer in the capsule housing.
According to the present invention, this task has been solved in that the first tube is conductively connected at its second end with a second tube that is adjacent to the inside wall of the capsule housing, with an insulating layer interposed between them.
216216~
As an example, the first tube can be formed by the supporting tube of a ring-core current transformer. This supporting tube is then secured at one end to the inside wall of the capsule housing, for example, by means of a screw-type fastening. The second end of the tube may not be connected conductively to the capsule housing, for this would then form a conductive loop that surrounds the annular core, in which current could be induced by the primary current flowing in the high-voltage conductor. On the other hand, there should not be too great a gap between the second end of the tube and the capsule housing because travelling waves could penetrate into the area of the secondary winding through such a space, and these would then cause excess voltage at the test terminals of the current transformer.
In order to close this intervening space, the present invention makes provision for a second tube that is connected conductively to the first tube but separated from the capsule housing by the insulating layer. It is preferred that the second tube have its periphery adjacent to the inside wall of the capsule housing, with an insulating layer interposed between it and said capsule housing. It is preferred that the thickness of the insulating layer be slight compared to the axial extent of the area over which the second tube is in contact with the insulating layer.
This means that the conductive loop that surrounds the annular core is broken by the insulating layer. Nevertheless, the current transformer is largely sealed off against travelling waves by an intervening space between the second tube and the inside wall of the capsule housing, this space being relatively narrow in relation to its length.
One embodiment of the present invention is such that the second tube overlaps the first tube in the axial direction, at 21~216~
least in part. This design saves space with respect to the axial length of the current transformer.
One further advantageous embodiment of the present invention is such that the insulating layer consists of a material that greatly attenuates electromagnetic waves. The material can, for example, consist of an epoxy resin that is filled with attenuating materials.
The choice of such a material that greatly attenuates electromagnetic waves assures even more effective sealing of the current transformer against travelling waves and other electromagnetic interference pulses.
In addition, the present invention can advantageously be such that the insulating layer is of a plastic.
Such a plastic is easily worked, and in particular can be poured, so that it can either be applied to the inside wall of the capsule housing or to the outside wall of the second tube or, once the current transformer has being installed, it can be poured into the space between the inside wall of the capsule housing and the second tube.
A further advantageous embodiment of the present invention is such that the second tube is cemented to the inside wall of the capsule housing by means of the insulating layer.
Thus, the current transformer can be fixed even more securely within the capsule housing by the appropriate selection of a suitable material for the insulating layer. In addition, the insulating layer can also dampen mechanical oscillations of the capsule housing.
In addition to the foregoing, the present invention can advantageously be such that the first tube forms one piece with the second tube, and in particular that the first tube and the second tube are formed as a single casting.
The supporting tube for the current transformer thus be cast with the second tube as a single part, which greatly reduces assembly costs. The shielding electrodes of the current transformer can also be integrated into this molded part.
The present invention can also be configured advantageously in that the second tube is connected conductively to the first tube by means of a shielding electrode of the current transformer.
The shielding electrodes can be screwed onto the first tube as separate parts and one of the shielding electrodes can then support the second tube.
It can also be advantageous that the second tube be formed as an outwardly curved flange on the first tube. This means that the first tube and the second tube can be manufactured in a cost-effective manner and simply installed. A shielding electrode can also be integrated into this part.
The present invention will be described in greater detail below on the basis of one embodiment shown in the drawing appended hereto. This drawing is a longitudinal cross-section through a tubular capsule housing with built-in ring-core current transformer.
The current transformer 1 incorporates a first tube 2 (supporting tube) that is a casting, in which a first shielding electrodes 3 is integrated. The first tube 2 supports the ring cores 4, 5 that are surrounded by the 21~21~ ~
`_ secondary winding (not shown herein) that are encased in sealing compound (not shown herein) and are connected to the first tube 2. The shielding electrode 3 is conductively connected to the capsule housing 6 through a screw-type connection.
At the end of the supporting tube 2 that is opposite the first shielding electrode 3, this tube is connected to a second shielding electrode 7 by means of a screw-type connection. A
second tube 8 is screwed onto the second shielding electrode 7, and this second tube lies against the inside wall of the capsule housing 6 with an insulating layer 9 interposed between them.
The first tube 2 and the annular cores coaxially enclose a high-voltage line 10 through which the current that is to be measured is flowing.
TE~ TRANSLATI 216 A Metal-Enclosed High-Voltage Switching System with a Current Transformer The present invention relates to a metal-enclosed high voltage switch gear with a capsule-type housing and a current transformer that is arranged within this, the secondary winding of said transformer surrounding coaxially a high-voltage line, a first tube being arranged between the secondary winding of the current transformer and the high voltage line, the first end of said tube being connected electrically with the capsule-type housing and being electrically insulated from this at the remaining points.
A high-voltage switch gear of this kind is known, for example, from E 0 060 636 B1. In the high-voltage switching system gear described therein, a ring core current transformer is to be so shielded that no excess voltage occurs at the test terminals as a result of traveling waves within the capsule-type housing. An electrically-conductive shielding body that partially overlaps the tube so as to electrically insulate it in part, and which is connected to the capsule so as to be electrically conductive, is provided for this purpose.
It is the task of the present invention to simplify the construction of a metal-enclosed high-voltage switching system, to achieve good shielding for the current transformer, and reduce costs for installing the current transformer in the capsule housing.
According to the present invention, this task has been solved in that the first tube is conductively connected at its second end with a second tube that is adjacent to the inside wall of the capsule housing, with an insulating layer interposed between them.
216216~
As an example, the first tube can be formed by the supporting tube of a ring-core current transformer. This supporting tube is then secured at one end to the inside wall of the capsule housing, for example, by means of a screw-type fastening. The second end of the tube may not be connected conductively to the capsule housing, for this would then form a conductive loop that surrounds the annular core, in which current could be induced by the primary current flowing in the high-voltage conductor. On the other hand, there should not be too great a gap between the second end of the tube and the capsule housing because travelling waves could penetrate into the area of the secondary winding through such a space, and these would then cause excess voltage at the test terminals of the current transformer.
In order to close this intervening space, the present invention makes provision for a second tube that is connected conductively to the first tube but separated from the capsule housing by the insulating layer. It is preferred that the second tube have its periphery adjacent to the inside wall of the capsule housing, with an insulating layer interposed between it and said capsule housing. It is preferred that the thickness of the insulating layer be slight compared to the axial extent of the area over which the second tube is in contact with the insulating layer.
This means that the conductive loop that surrounds the annular core is broken by the insulating layer. Nevertheless, the current transformer is largely sealed off against travelling waves by an intervening space between the second tube and the inside wall of the capsule housing, this space being relatively narrow in relation to its length.
One embodiment of the present invention is such that the second tube overlaps the first tube in the axial direction, at 21~216~
least in part. This design saves space with respect to the axial length of the current transformer.
One further advantageous embodiment of the present invention is such that the insulating layer consists of a material that greatly attenuates electromagnetic waves. The material can, for example, consist of an epoxy resin that is filled with attenuating materials.
The choice of such a material that greatly attenuates electromagnetic waves assures even more effective sealing of the current transformer against travelling waves and other electromagnetic interference pulses.
In addition, the present invention can advantageously be such that the insulating layer is of a plastic.
Such a plastic is easily worked, and in particular can be poured, so that it can either be applied to the inside wall of the capsule housing or to the outside wall of the second tube or, once the current transformer has being installed, it can be poured into the space between the inside wall of the capsule housing and the second tube.
A further advantageous embodiment of the present invention is such that the second tube is cemented to the inside wall of the capsule housing by means of the insulating layer.
Thus, the current transformer can be fixed even more securely within the capsule housing by the appropriate selection of a suitable material for the insulating layer. In addition, the insulating layer can also dampen mechanical oscillations of the capsule housing.
In addition to the foregoing, the present invention can advantageously be such that the first tube forms one piece with the second tube, and in particular that the first tube and the second tube are formed as a single casting.
The supporting tube for the current transformer thus be cast with the second tube as a single part, which greatly reduces assembly costs. The shielding electrodes of the current transformer can also be integrated into this molded part.
The present invention can also be configured advantageously in that the second tube is connected conductively to the first tube by means of a shielding electrode of the current transformer.
The shielding electrodes can be screwed onto the first tube as separate parts and one of the shielding electrodes can then support the second tube.
It can also be advantageous that the second tube be formed as an outwardly curved flange on the first tube. This means that the first tube and the second tube can be manufactured in a cost-effective manner and simply installed. A shielding electrode can also be integrated into this part.
The present invention will be described in greater detail below on the basis of one embodiment shown in the drawing appended hereto. This drawing is a longitudinal cross-section through a tubular capsule housing with built-in ring-core current transformer.
The current transformer 1 incorporates a first tube 2 (supporting tube) that is a casting, in which a first shielding electrodes 3 is integrated. The first tube 2 supports the ring cores 4, 5 that are surrounded by the 21~21~ ~
`_ secondary winding (not shown herein) that are encased in sealing compound (not shown herein) and are connected to the first tube 2. The shielding electrode 3 is conductively connected to the capsule housing 6 through a screw-type connection.
At the end of the supporting tube 2 that is opposite the first shielding electrode 3, this tube is connected to a second shielding electrode 7 by means of a screw-type connection. A
second tube 8 is screwed onto the second shielding electrode 7, and this second tube lies against the inside wall of the capsule housing 6 with an insulating layer 9 interposed between them.
The first tube 2 and the annular cores coaxially enclose a high-voltage line 10 through which the current that is to be measured is flowing.
Claims (8)
1. A metal-enclosed high-voltage switching device with a cylindrical capsule-type housing (6) and a current transformer (1) that is arranged within this, the secondary winding of which coaxially surrounds a high-voltage line (10), a first tube (2) and a second tube (8) being provided between the secondary winding of the current transformer (1) and the high voltage line (10), this first tube (2) being conductively connected at its first end with the capsule housing (6) and being electrically insulated from this at the remaining points, characterized in that the first tube (2) is conductively connected at its second end with the second tube (8) which lies on the inner wall of the capsule housing (6) with an interposed insulating layer (9), such that the area of contact of the capsule housing (6) is of a length in the axial direction that is great compared to the thickness of the insulating layer (9).
2. A metal-enclosed high-voltage switching system as described in Claim 1, characterized in that the second tube (8) overlaps the first tube (2) in the axial direction, at least in part.
3. A metal-enclosed high-voltage switching system as described in Claim 1 or Claim 2, characterized in that the insulating layer (9) is of a material that greatly attenuates electromagnetic waves.
4. A metal-enclosed high-voltage switching system as described in one of the preceding claims, characterized in that the insulating layer (9) is of plastic.
5. A metal-enclosed high-voltage switching system as described in one of the preceding claims, characterized in that the second tube (8) is cemented to the inside wall of the capsule housing (6) by means of the insulating layer (9).
6. A metal-enclosed high-voltage switching system as described in one of the Claims 1 to 5 , characterized in that the first tube (2) forms one piece with the second tube (8) and in particular in that the first tube (2) and the second tube (8) are formed as a single casting.
7. A metal-enclosed high-voltage switching system as described in one of the Claims 1 to 5, characterized in that the second tube (8) is conductively connected to the first tube (2)) by a shielding electrode (7) of the current transformer (1).
8. A metal-enclosed high-voltage switching system as described in one of the Claims 1 to 5 , characterized in that the second tube (8) is formed as a flange of the first shoe (2) that is curved outward.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4315772A DE4315772A1 (en) | 1993-05-07 | 1993-05-07 | Metal-enclosed high-voltage switchgear with a current transformer |
| DEP4315772.6 | 1993-05-07 | ||
| PCT/DE1994/000500 WO1994027306A1 (en) | 1993-05-07 | 1994-04-29 | Metal-enclosed high-voltage switchgear with a current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2162163A1 true CA2162163A1 (en) | 1994-11-24 |
Family
ID=6487847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002162163A Abandoned CA2162163A1 (en) | 1993-05-07 | 1994-04-29 | A metal-enclosed high-voltage switching system with a current transformer |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0697131B1 (en) |
| AT (1) | ATE167751T1 (en) |
| CA (1) | CA2162163A1 (en) |
| DE (2) | DE4315772A1 (en) |
| WO (1) | WO1994027306A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19841134A1 (en) | 1998-09-09 | 2000-03-16 | Abb Daimler Benz Transp | Insulating housing for high voltage device has square housing with U-shaped wall section extending from top via front to bottom, outer surface at earth potential, inner surface at high voltage |
| DE102005005445A1 (en) * | 2005-02-04 | 2006-08-10 | Trench Germany Gmbh | Toroid |
| DE102006040037A1 (en) * | 2006-08-23 | 2008-02-28 | Siemens Ag | Connection module with an encapsulating housing |
| US9291651B2 (en) | 2011-08-05 | 2016-03-22 | Green Seas Ventures, Ltd. | Feedthrough insulator |
| WO2016070917A1 (en) | 2014-11-05 | 2016-05-12 | Abb Technology Ltd | An electromagnetic shield for use in a power system |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE612070C (en) * | 1932-02-17 | 1935-04-12 | Aeg | Oil-filled bushing current transformer for high voltages with a closed iron core provided with the low voltage winding and preferably made of highly permeable tapes |
| CH433480A (en) * | 1966-02-16 | 1967-04-15 | Bbc Brown Boveri & Cie | Electrical system with high current transformer in buildings |
| CH514923A (en) * | 1970-04-17 | 1971-10-31 | Bbc Brown Boveri & Cie | Toroidal current transformer on a metal-enclosed, compressed gas-insulated high-voltage switchgear |
| CH627023A5 (en) * | 1978-03-09 | 1981-12-15 | Bbc Brown Boveri & Cie | |
| EP0063636B2 (en) * | 1981-04-28 | 1992-12-30 | Sprecher + Schuh AG | Current transformer with annular case to be built in a metal cast high-tension switchgear installation |
| DE3531491A1 (en) * | 1985-08-30 | 1987-03-05 | Siemens Ag | METAL-ENCLOSED, PRESSURE GAS-INSULATED HIGH-VOLTAGE SWITCHGEAR WITH A MEASURING TRANSDUCER |
| DE8904684U1 (en) * | 1989-04-11 | 1989-06-15 | Siemens Ag, 1000 Berlin Und 8000 Muenchen, De | |
| DE4122332A1 (en) * | 1991-04-22 | 1992-10-29 | Asea Brown Boveri | CURRENT TRANSFORMER FOR A MEDIUM OR HIGH VOLTAGE SYSTEM |
-
1993
- 1993-05-07 DE DE4315772A patent/DE4315772A1/en not_active Withdrawn
-
1994
- 1994-04-29 AT AT94914318T patent/ATE167751T1/en not_active IP Right Cessation
- 1994-04-29 EP EP94914318A patent/EP0697131B1/en not_active Expired - Lifetime
- 1994-04-29 DE DE59406328T patent/DE59406328D1/en not_active Expired - Fee Related
- 1994-04-29 WO PCT/DE1994/000500 patent/WO1994027306A1/en active IP Right Grant
- 1994-04-29 CA CA002162163A patent/CA2162163A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP0697131A1 (en) | 1996-02-21 |
| DE4315772A1 (en) | 1994-11-10 |
| WO1994027306A1 (en) | 1994-11-24 |
| EP0697131B1 (en) | 1998-06-24 |
| DE59406328D1 (en) | 1998-07-30 |
| ATE167751T1 (en) | 1998-07-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |