CA1105101A - Compressed-gas-insulated high-voltage switch installation - Google Patents
Compressed-gas-insulated high-voltage switch installationInfo
- Publication number
- CA1105101A CA1105101A CA296,873A CA296873A CA1105101A CA 1105101 A CA1105101 A CA 1105101A CA 296873 A CA296873 A CA 296873A CA 1105101 A CA1105101 A CA 1105101A
- Authority
- CA
- Canada
- Prior art keywords
- gas
- casing
- compressed
- switch installation
- conductor
- 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.)
- Expired
Links
Classifications
-
- 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
- H02B13/055—Features relating to the gas
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Gas-Insulated Switchgears (AREA)
- Insulators (AREA)
- Patch Boards (AREA)
- Connector Housings Or Holding Contact Members (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A compressed-gas-insulated high-voltage switch installation comprises a casing enclosing the conductor carrying the high voltage, and a compressed-gas-insulated outdoor bushing, for connection to an over-head line, in the wall of the housing enclosing the switch installation.
The conductor is made hollow in the outdoor bushing, and in at least a part of the casing in the housing, for the purpose of carrying a flow of gas. In the vicinity of the free end of the outdoor bushing on the one hand, and in an adjacent section of the casing, divided off by a gas-tight supporting insulator on the other hand, the conductor comprises passages for the flow of gas, the said flow of gas being set in motion by a circul-ating device connected to the gas chamber divided off by the said supporting insulator.
A compressed-gas-insulated high-voltage switch installation comprises a casing enclosing the conductor carrying the high voltage, and a compressed-gas-insulated outdoor bushing, for connection to an over-head line, in the wall of the housing enclosing the switch installation.
The conductor is made hollow in the outdoor bushing, and in at least a part of the casing in the housing, for the purpose of carrying a flow of gas. In the vicinity of the free end of the outdoor bushing on the one hand, and in an adjacent section of the casing, divided off by a gas-tight supporting insulator on the other hand, the conductor comprises passages for the flow of gas, the said flow of gas being set in motion by a circul-ating device connected to the gas chamber divided off by the said supporting insulator.
Description
¢~
The invention relates to Q compressed-gas-insulated ~igh-voltage switch installation having a casing enclosing the conductor carrying the high voltage, and a compressed-gas insulated outdoor bushing, for connection to an overhead line, in the wall of the housing enclosing the said switch installation.
Known high-voltage switch installations, insulated with pressur-ized SF6 gas, operate according to predetermined requirements in an ambient-temperature range of between -25 and ~40 C. In high-voltage switch install-ations of this kind, at -25C the pressure at which liquefaction of the insulating agent is to be expected is 6 bars. If the pressure is 3.3 bars, for example, then liquefaction of the insulating agent is to be expected at about -40 C. In high-voltage switch installations of this kind, there is a considerable increase, below this liquefaction pressure, in the cost of achieving the required dielectric strength, and there is also a dimensional increase.
If high-voltage switch installations of this kind are to be sub-jected to ambient temperatures of -55 C, for example, it is usually necess-ary to adopt special measures. A certain amount of protection against very low temperatures may be obtained by accommodating compressed-gas-insulated high-voltage switch installations in buildings, but problems arise when an installation of this kind comprises a compressed-gas-insulated outdoor bush-ing for connection to an overhead line, which is to be exposed to a minimal temperature of the order-of -55C.
It is the purpose of the invention to provide a high-voltage switch installation of the type mentioned at the beginning hereof which will have economically acceptable dimensions and operating pressures and will maintain its insulating properties even at temperatures in the -55C range.
According to the invention there is provided an indoor high-voltage switch instal~lation having a tubular casing enclosing the conductor carrying the high voltage and containing an insulating compressed gas and a compressed-gas-insulated outdoor bushing for low outdoor temperatures for connection to an overhead line, said outdoor bushing being disposed at the outer end of the casing which penetrates the wall of a building enclosing the switch install-ation, characterized in that a hollow conductor is provided in the outdoor bushing, in a portion oE the casing penet:rating the wall, and at least in an adjacent section of the casing enclosed by the building for carrying a flow of gas, and that the said conductor comprises, in the vicinity of the free end of the outdoor bushing on the one hand, and in the adjacent section of the casing separated by a gas-tight supporting insulator on the other hand, openings connecting the enclosed bushing interior and a gas chamber contained in said adjacent casing section for the flow of gas, said Elow of gas being set in motion by a circulating device connected to the gas chamber and to said portion of the casing penetrating the wall which is partitioned off from the gas chamber by the supporting insulator.
The invention makes it possible to keep the gas density within the bushing, i.e. the dielectric strength of the compressed~gas-insulated out-door bushing, at a specific value independent of the ambient temperature, since the flow of gas makes it possible to heat up the outdoor bushing from the interior of the compressed-gas-insulated high-voltage switch installation.
It i9 highly advantageous if the gas-carrying connecting lines of ; the grounded circulating device open into the partitioned-off gas chamber casings, since this makes it possible to pass the heat loss, which occurs ~- when the conductor carrying the high voltage is under load, by means of a flow of gas, directly to the outdoor bushing, and to return the said gas through the insulated area between the conductor carrying the high voltage, the casing, and the porcelain insulator of the outdoor bushing. There is thus no need to take special precautions to insulate the grounded circulating devices.
The circu:Lating device may be equipped with a heater in order to ensure that the compressed-gas-insulated high-voltage switch installation, and the outdoor bushing, remain serviceable even when the installation is under a light load or no load at all.
An example of an embodiment of a compressed-gas-insula~ed high-voltage installation is described hereinafter, and its method of operation
The invention relates to Q compressed-gas-insulated ~igh-voltage switch installation having a casing enclosing the conductor carrying the high voltage, and a compressed-gas insulated outdoor bushing, for connection to an overhead line, in the wall of the housing enclosing the said switch installation.
Known high-voltage switch installations, insulated with pressur-ized SF6 gas, operate according to predetermined requirements in an ambient-temperature range of between -25 and ~40 C. In high-voltage switch install-ations of this kind, at -25C the pressure at which liquefaction of the insulating agent is to be expected is 6 bars. If the pressure is 3.3 bars, for example, then liquefaction of the insulating agent is to be expected at about -40 C. In high-voltage switch installations of this kind, there is a considerable increase, below this liquefaction pressure, in the cost of achieving the required dielectric strength, and there is also a dimensional increase.
If high-voltage switch installations of this kind are to be sub-jected to ambient temperatures of -55 C, for example, it is usually necess-ary to adopt special measures. A certain amount of protection against very low temperatures may be obtained by accommodating compressed-gas-insulated high-voltage switch installations in buildings, but problems arise when an installation of this kind comprises a compressed-gas-insulated outdoor bush-ing for connection to an overhead line, which is to be exposed to a minimal temperature of the order-of -55C.
It is the purpose of the invention to provide a high-voltage switch installation of the type mentioned at the beginning hereof which will have economically acceptable dimensions and operating pressures and will maintain its insulating properties even at temperatures in the -55C range.
According to the invention there is provided an indoor high-voltage switch instal~lation having a tubular casing enclosing the conductor carrying the high voltage and containing an insulating compressed gas and a compressed-gas-insulated outdoor bushing for low outdoor temperatures for connection to an overhead line, said outdoor bushing being disposed at the outer end of the casing which penetrates the wall of a building enclosing the switch install-ation, characterized in that a hollow conductor is provided in the outdoor bushing, in a portion oE the casing penet:rating the wall, and at least in an adjacent section of the casing enclosed by the building for carrying a flow of gas, and that the said conductor comprises, in the vicinity of the free end of the outdoor bushing on the one hand, and in the adjacent section of the casing separated by a gas-tight supporting insulator on the other hand, openings connecting the enclosed bushing interior and a gas chamber contained in said adjacent casing section for the flow of gas, said Elow of gas being set in motion by a circulating device connected to the gas chamber and to said portion of the casing penetrating the wall which is partitioned off from the gas chamber by the supporting insulator.
The invention makes it possible to keep the gas density within the bushing, i.e. the dielectric strength of the compressed~gas-insulated out-door bushing, at a specific value independent of the ambient temperature, since the flow of gas makes it possible to heat up the outdoor bushing from the interior of the compressed-gas-insulated high-voltage switch installation.
It i9 highly advantageous if the gas-carrying connecting lines of ; the grounded circulating device open into the partitioned-off gas chamber casings, since this makes it possible to pass the heat loss, which occurs ~- when the conductor carrying the high voltage is under load, by means of a flow of gas, directly to the outdoor bushing, and to return the said gas through the insulated area between the conductor carrying the high voltage, the casing, and the porcelain insulator of the outdoor bushing. There is thus no need to take special precautions to insulate the grounded circulating devices.
The circu:Lating device may be equipped with a heater in order to ensure that the compressed-gas-insulated high-voltage switch installation, and the outdoor bushing, remain serviceable even when the installation is under a light load or no load at all.
An example of an embodiment of a compressed-gas-insula~ed high-voltage installation is described hereinafter, and its method of operation
-2-.~ :
is explained, in conjunction with the drawing attached hereto, wherein:
Figure 1 is a diagrammatic representation, in cross section, oE a compressed-gas-insulated high-voltage switch installation;
Figure 2 shows a detail of the installation, with a compressed-gas-insulated outdoor bushing.
In Figure 1, a compressed-gas-insulated high-voltage switch installation is shown diagrammatically inside a housing l. As shown more particularly in Figure 2, conductor 3, carrying the high voltage, is enclosed in a casing 4 and has an outdoor bushing 6 which passes through wall 5 of the said housing and is intended to provide a connection to an overhead line. It is assumed that temperatures as low as about -55 C obtain outside housing 1. Such temperatures are capable of impairing the dielectric strength of the parts of the installation exposed thereto, especially the interior of the outdoor bushing, as a result of liquefaction caused by decreasing gas density.
As shown in Figure 2, conductor 3, which carries the high voltage, is made hollow in outdoor bushing 6, the outer casing of which may, as usual, be made of porcelain. Conductor 3 is also hollow in a part of casi:ng 4 in housing 1, for the purpose of carrying a flow of gas.
In the vicinîty of free end 7 of outdoor bushing 6 on the one hand, and in an adjacent section 4a of the casing, separated by a gas-tight supporting insulator 8 from gas chamber 9, on the other hand, the said conductor is equipped with passages 10 through which gas Elows in the direc-tion of the arrows shown in Figure 2, the said flow of gas being set in motion by means of a circu:Lating device 12 which is connected to gas chambers 9 and ll in casing section 4a. Gas-carrying connecting lines 13, 14 of the said circulating device open, to this end, into gas chambers 9, 11. Circulating device 12 is located within housing 1 and is-not affected by the low outside temperature. Desirable heating of the flow of gas indicated by the arrows may be provided by the heat released by conductor 3 when the installation is operating at its rated load.
Circulating device 12 may, however, be equipped with a heater which will heat up the cold insulating agent drawn from connecting line 13, thus
is explained, in conjunction with the drawing attached hereto, wherein:
Figure 1 is a diagrammatic representation, in cross section, oE a compressed-gas-insulated high-voltage switch installation;
Figure 2 shows a detail of the installation, with a compressed-gas-insulated outdoor bushing.
In Figure 1, a compressed-gas-insulated high-voltage switch installation is shown diagrammatically inside a housing l. As shown more particularly in Figure 2, conductor 3, carrying the high voltage, is enclosed in a casing 4 and has an outdoor bushing 6 which passes through wall 5 of the said housing and is intended to provide a connection to an overhead line. It is assumed that temperatures as low as about -55 C obtain outside housing 1. Such temperatures are capable of impairing the dielectric strength of the parts of the installation exposed thereto, especially the interior of the outdoor bushing, as a result of liquefaction caused by decreasing gas density.
As shown in Figure 2, conductor 3, which carries the high voltage, is made hollow in outdoor bushing 6, the outer casing of which may, as usual, be made of porcelain. Conductor 3 is also hollow in a part of casi:ng 4 in housing 1, for the purpose of carrying a flow of gas.
In the vicinîty of free end 7 of outdoor bushing 6 on the one hand, and in an adjacent section 4a of the casing, separated by a gas-tight supporting insulator 8 from gas chamber 9, on the other hand, the said conductor is equipped with passages 10 through which gas Elows in the direc-tion of the arrows shown in Figure 2, the said flow of gas being set in motion by means of a circu:Lating device 12 which is connected to gas chambers 9 and ll in casing section 4a. Gas-carrying connecting lines 13, 14 of the said circulating device open, to this end, into gas chambers 9, 11. Circulating device 12 is located within housing 1 and is-not affected by the low outside temperature. Desirable heating of the flow of gas indicated by the arrows may be provided by the heat released by conductor 3 when the installation is operating at its rated load.
Circulating device 12 may, however, be equipped with a heater which will heat up the cold insulating agent drawn from connecting line 13, thus
-3-.
~ 5~
ensuring effective heating of outdoor bushing 6 whenever the installation is switched off.
The arrangement outlined above has the advantage that the ground-ing of the circulating device presents no problems. This makes it possible to control the heating of the gas chambers, and the circulation, without expensive equipment. It is possible to use the temperature of the conductor or of the gas to switch off the circulation.
The solution according to the invention has advantages in all cases where, with existing dimensions and because of the difficulty of increasing the pressure, industrially pure SF6 gas, or mixtures o-f gas which liquefy at low temperatures, e.g. SF6 and nitrogen, cannot be used success-fully, and where an effective pressure drop would require a special, large-dimension design for low-temperature use.
~ 5~
ensuring effective heating of outdoor bushing 6 whenever the installation is switched off.
The arrangement outlined above has the advantage that the ground-ing of the circulating device presents no problems. This makes it possible to control the heating of the gas chambers, and the circulation, without expensive equipment. It is possible to use the temperature of the conductor or of the gas to switch off the circulation.
The solution according to the invention has advantages in all cases where, with existing dimensions and because of the difficulty of increasing the pressure, industrially pure SF6 gas, or mixtures o-f gas which liquefy at low temperatures, e.g. SF6 and nitrogen, cannot be used success-fully, and where an effective pressure drop would require a special, large-dimension design for low-temperature use.
- 4 -" .
~ . . .. . . .
~ . . .. . . .
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An indoor high-voltage switch installation having a tubular casing enclosing the conductor carrying the high voltage and containing an insulat-ing compressed gas and a compressed-gas-insulated outdoor bushing for low outdoor temperatures for connection to an overhead line, said outdoor bushing being disposed at the outer end of the casing which penetrates the wall of a building enclosing the switch installation, characterized in that a hollow conductor is provided in the outdoor bushing, in a portion of the casing pene-trating the wall, and at least in an adjacent section of the casing enclosed by the building for carrying a flow of gas, and that the said conductor com-prises, in the vicinity of the free end of the outdoor bushing on the one hand, and in the adjacent section of the casing separated by a gas-tight supporting insulator on the other hand, openings connecting the enclosed bushing interior and a gas chamber contained in said adjacent casing section for the flow of gas, said flow of gas being set in motion by a circulating device connected to the gas chamber and to said portion of the casing pene-trating the wall which is partitioned off from the gas chamber by the supporting insulator.
2. An indoor high-voltage switch installation according to claim 1, characterized in that gas-carrying connecting lines of the circulating device open into the gas chamber and the portion of the chamber penetrating the wall, the circulating device being grounded.
3. An indoor high-voltage switch installation according to claim 1 or 2, characterized in that the circulating device is provided with a heater.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2708359.6 | 1977-02-23 | ||
| DE2708359A DE2708359C3 (en) | 1977-02-23 | 1977-02-23 | Indoor high-voltage switchgear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1105101A true CA1105101A (en) | 1981-07-14 |
Family
ID=6002207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA296,873A Expired CA1105101A (en) | 1977-02-23 | 1978-02-15 | Compressed-gas-insulated high-voltage switch installation |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS53106441A (en) |
| CA (1) | CA1105101A (en) |
| DE (1) | DE2708359C3 (en) |
| NO (1) | NO144862C (en) |
| SE (1) | SE430838B (en) |
| SU (1) | SU698562A3 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2692411B1 (en) * | 1992-06-10 | 1994-07-22 | Alsthom Gec | SHIELDED STATION WITH CROSSING UNDER COLD ENVIRONMENT. |
| DE19542592A1 (en) * | 1995-11-15 | 1997-05-22 | Asea Brown Boveri | Gas-insulated system |
| DE10032656B4 (en) * | 2000-06-28 | 2008-11-27 | Siemens Ag | Outdoor high voltage bushing and high voltage switchgear with such a bushing |
| DE10129747C1 (en) * | 2001-06-15 | 2003-02-06 | Siemens Ag | Thermal insulation for a high voltage circuit breaker for low temperatures |
| DE102006032396A1 (en) * | 2006-07-07 | 2008-01-10 | Siemens Ag | Container for a power supply and distribution switchgear |
| JP2009289624A (en) * | 2008-05-30 | 2009-12-10 | Japan Ae Power Systems Corp | Gas insulated electric appliance |
| JP5400227B2 (en) * | 2010-09-13 | 2014-01-29 | 三菱電機株式会社 | Gas insulated electrical equipment |
| DE102011077190A1 (en) * | 2011-06-08 | 2012-12-13 | Siemens Aktiengesellschaft | Device for passing a high voltage through a wall to earth potential |
| EP2831172B1 (en) * | 2012-03-29 | 2018-05-02 | Dow Global Technologies LLC | Curable compositions |
-
1977
- 1977-02-23 DE DE2708359A patent/DE2708359C3/en not_active Expired
-
1978
- 1978-02-03 SE SE7801296A patent/SE430838B/en unknown
- 1978-02-13 NO NO780498A patent/NO144862C/en unknown
- 1978-02-15 CA CA296,873A patent/CA1105101A/en not_active Expired
- 1978-02-22 SU SU782582700A patent/SU698562A3/en active
- 1978-02-22 JP JP1960378A patent/JPS53106441A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| NO780498L (en) | 1978-08-24 |
| JPS53106441A (en) | 1978-09-16 |
| SE430838B (en) | 1983-12-12 |
| SE7801296L (en) | 1978-08-24 |
| DE2708359B2 (en) | 1979-11-15 |
| NO144862B (en) | 1981-08-17 |
| DE2708359A1 (en) | 1978-08-24 |
| DE2708359C3 (en) | 1980-07-31 |
| SU698562A3 (en) | 1979-11-15 |
| NO144862C (en) | 1981-11-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |