EP0049641B1 - Gas insulated electrical apparatus - Google Patents

Gas insulated electrical apparatus Download PDF

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Publication number
EP0049641B1
EP0049641B1 EP19810304665 EP81304665A EP0049641B1 EP 0049641 B1 EP0049641 B1 EP 0049641B1 EP 19810304665 EP19810304665 EP 19810304665 EP 81304665 A EP81304665 A EP 81304665A EP 0049641 B1 EP0049641 B1 EP 0049641B1
Authority
EP
European Patent Office
Prior art keywords
bushing
cable
terminal
gas insulated
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.)
Expired
Application number
EP19810304665
Other languages
German (de)
French (fr)
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EP0049641A1 (en
Inventor
Teruo Ina
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP0049641A1 publication Critical patent/EP0049641A1/en
Application granted granted Critical
Publication of EP0049641B1 publication Critical patent/EP0049641B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/06—Mounting, supporting or suspending transformers, reactors or choke coils not being of the signal type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general

Definitions

  • This invention relates to gas insulated electrical apparatuses.
  • a gas insulated electrical apparatus which comprises a power transformer and power switchgear including a circuit breaker, a disconnecting switch, an instrument current transformer, an instrument voltage transformer, a ground switch and the like disposed in separate stationary housings, and with the switchgear electrically connected directly to power cables.
  • the object of the present invention is to provide a gas insulated electrical insulation including a power transformer and power switchgear which is smaller than comparable equipment according to the prior art, and is easier to inspect and maintain.
  • a gas insulated electrical apparatus including a transformer housed in an insulating gas-filled sealed container, power switching means housed in an insulating gas-filled sealed container and connected to a primary coil of said transformer, a bushing terminal passing through a wall of the sealed enclosure that contains the switching means and connected to said switching means, and a first bushing fixed to said sealed enclosure and supporting said bushing terminal and projecting towards the outside of said sealed enclosure, characterised in that the transformer and the power switching means on its primary side are enclosed in a common insulating gas-filled sealed container, that a cable box is installed adjacent to said sealed container, an end of a cable is housed within said cable box, a connection terminal is joined to said cable end and is capable of connection to said bushing terminal, and a second bushing is fixed to said cable box and supports said connection terminal, and is capable of engaging said first bushing.
  • U.S. Patent 2100721 describes an oil-filled transformer for local distribution with plug-in terminals and an internal protective circuit breaker on the secondary side.
  • the construction described is suitable for relatively small low- powered local distribution transformers but is not applicable to high power transformers and power switchgear on the primary side.
  • FIGs 1 (a) and 1(b) and Figure 2 a gas insulated electrical apparatus of two banks is shown.
  • Transformer coils 1a, 1b wound on magnetic cores 2a, 2b are contained in sealed housings 3a, 3b which are filled with an insulating gas such as SF 6 gas.
  • Switchgear 4a, 4b are connected between the transformer coils 1a, 1b and power cables 5a, 5b.
  • the switchgear 4a, 4b comprises circuit breakers, 401a, 401b and disconnecting switches 402a, 402b which function to connect or disconnect the transformer coils 1a, 1 b to or from the power cables 5a, 5b; instrument current transformers 403a, 403b which detect the currents flowing through the transformer coils 1a, 1b; instrument voltage transformers 404a, 404b which detect the voltages applied to the transformer coils 1a, 1b; and ground switches 405a, 405b which earth the transformer coils 1a, 1b.
  • the sealed housings 6a, 6b contain the switchgears 4a, 4b, and are filled with an insulating gas such as SF 6 gas.
  • Bushings 7a, 7b are mounted on the sealed housings 6a, 6b so as to pass through the walls of the respective housings, and function to connect the ends 501a, 501b of the power cables 5a, 5b to the switchgears 4a, 4b.
  • Cable boxes 8a, 8b are mounted on the sealed housings 6a, 6b.
  • the cable boxes 8a, 8b function to protect the cable ends 501 a, 501 b from dust etc., and also to prevent live parts such as the cable ends 501 a, 501 b from being physically exposed, in order to prevent electric shock accidents.
  • Bushings 9a, 9b are mounted on the sealed housings 6a, 6b so as to pass through the walls of the housings, while primary bushings 10a, 10b are mounted on the sealed housings 3a, 3b so as to pass through a walls of the latter.
  • Conductors 11 a, 11 b are connected between the bushings 9a, 9b and the primary bushings 10a, 10b, to connect the switchgears 4a, 4b to the transformer coils 1 a, 1b.
  • Ducts 12a, 12b are constructed of a metal material such as sheet iron, and house the conductors 11 a, 11b b therein.
  • these ducts have the two end parts mounted on the sealed housings 3a, 3b and the sealed housings 6a, 6b, to electrically protect the conductors 11a, 11 etc. from dust etc. and also to prevent live parts such as the conductors 11a, 11 from being physically exposed, thereby to prevent electric shock accidents.
  • Secondary bushings 13a, 13b are mounted on the sealed housings 3a, 3b so as to pass through the walls of the housings, and function to pass electrical power transformed by the transformer coils 1a, 1b.
  • a circuit breaker 14 is connected between the power cables, 5a, 5b and a power cable 15. Electric power supplied from the power cable 15 to the power cables 5a, 5b through the circuit breaker 14 is applied to the transformer coils 1 a, 1 through the switchgears 4a, 4b and is transformed by these transformer coils 1a, 1b. Thereafter, the transformed power is drawn from the secondary bushings 13a, 13b.
  • the prior-art gas insulated electrical apparatus thus constructed necessitates ducts 12a, 12b to house the conductors 11 a, 11 b being the connective conductors between the transformer coils 1a, 1 and the switchgears 4a, 4b; and the primary bushings 10a, 10b and the bushings 9a, 9b which are respectively mounted on the sealed housings 3a, 3b and the sealed housings 6a, 6b so as to pass through the walls thereof.
  • This has led to the disadvantage that the apparatus becomes large in size.
  • the circuit breaker 14 must be opened. This has led to the drawback that power supply is cut off on the side of the switchgear 4b, also.
  • This invention seeks to mitigate the disadvantages of the prior art as stated above, and provides a gas insulated electrical apparatus in which the switchgear 4a or 4b and the transformer coils 1a a or 1b are contained in a single sealed housing, and in which the power cables 5a and 5b are detachably connected to the switchgears 4a and 4b.
  • the switchgear 4a or 4b and the transformer coils 1a a or 1b are contained in a single sealed housing, and in which the power cables 5a and 5b are detachably connected to the switchgears 4a and 4b.
  • Figure 3(a) is a side view showing an embodiment of the gas insulated electrical apparatus according to this invention
  • Figure 3(b) is a plan view corresponding to Figure 3(a)
  • Figure 4 is a partial sectional side view showing the details of a bushing terminal and a line side terminal device.
  • portions corresponding to those in Figures 1(a) and 1(b) are respectively assigned the same reference numerals.
  • sealed housings 3A, 3B respectively contain the two transformer coils 1a, 1b and the switchgears 4a, 4b and are each filled with an insulating gas such as SF 6 gas.
  • the bushing terminals 16a, 16b are male in form in the present embodiment. These bushing terminals 16a and 16b are supported by the bushings 7a, 7b and have convex parts attheir respective fore ends.
  • Flanges 17a, 17b are formed integrally with the bushings 7a, 7b and are mounted on walls of the sealed housings 3A, 3B.
  • Connecting terminals 18a, 18b on the cable side function to detachably connect the power cables 5a, 5b to the bushing terminals 16a, 16b.
  • the terminals 18a, 18b comprise female form connective terminals 181a, 181b which are connected to the cable ends 501a, 501 b and which are connected to the convex parts at the fore ends of the bushing terminals 16a, 16b with the latter received snugly therein.
  • Bushings 183a, 183b serve to mount the connective terminals 181a, 181b on cable boxes 182a, 182b; and cable beds 184a, 184b ( Figures 3(a) and 3(b)) which support the power cables 5a, 5b.
  • Wheels 19 are mounted on the sealed housing 3A, 3B and function to allow the sealed housings to be moved.
  • the transformer coil la or 1b andthe switchgear 4a or 4b are contained in a single sealed housing 3A or 3B, and the transformer coil 1a a or 1 and the switchgear 4a or 4b are directly connected by means of the conductor 11 a or 11 b. Accordingly, the ducts 12a, 12b and the primary bushings 10a, 10b as well as the bushings 9a, 9b as in the prior-art apparatus shown in Figures 1 (a) and 1(b) are not required, and the apparatus can be reduced in overall size. Further, the sealed vessels 3A, 3B are provided with the wheels 19.
  • the bushing terminals 16a and the connective terminals 181a may be separated by moving the sealed vessel 3A to the right as viewed in Figures 3(a) and 3(b).
  • the switchgear 4a can be inspected without opening the circuit breaker 14 shown in Figure 2, and the power supply on the side of the sealed housing 3B need not be cut off.
  • the wheels 19 are mounted on the sealed vessels 3A, 3B, it could equally be the line side connection terminals 18a, 18b that are rendered movable to allow disconnection.
  • the transformer coils and the switchgear are contained in single sealed housing, allowing the apparatus to be made small in size, and the ducts of the prior-art apparatus to be dispensed with, which also brings about the benefit that the apparatus is reduced in cost. Furthermore, the power cables and the switchgears are detachably connected, so that when the gas insulated electrical apparatus is arranged in a plurality of banks, it is possible to disconnect only a desired one or ones of the switchgears from the power cables.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Gas-Insulated Switchgears (AREA)

Description

  • This invention relates to gas insulated electrical apparatuses.
  • A gas insulated electrical apparatus is known which comprises a power transformer and power switchgear including a circuit breaker, a disconnecting switch, an instrument current transformer, an instrument voltage transformer, a ground switch and the like disposed in separate stationary housings, and with the switchgear electrically connected directly to power cables. This resulted in the dimensions of the whole gas insulated electrical apparatus being large, and complicated and maintenance and inspection of the electrical apparatus.
  • The object of the present invention is to provide a gas insulated electrical insulation including a power transformer and power switchgear which is smaller than comparable equipment according to the prior art, and is easier to inspect and maintain.
  • According to the present invention there is provided a gas insulated electrical apparatus including a transformer housed in an insulating gas-filled sealed container, power switching means housed in an insulating gas-filled sealed container and connected to a primary coil of said transformer, a bushing terminal passing through a wall of the sealed enclosure that contains the switching means and connected to said switching means, and a first bushing fixed to said sealed enclosure and supporting said bushing terminal and projecting towards the outside of said sealed enclosure, characterised in that the transformer and the power switching means on its primary side are enclosed in a common insulating gas-filled sealed container, that a cable box is installed adjacent to said sealed container, an end of a cable is housed within said cable box, a connection terminal is joined to said cable end and is capable of connection to said bushing terminal, and a second bushing is fixed to said cable box and supports said connection terminal, and is capable of engaging said first bushing.
  • U.S. Patent 2100721 describes an oil-filled transformer for local distribution with plug-in terminals and an internal protective circuit breaker on the secondary side. The construction described is suitable for relatively small low- powered local distribution transformers but is not applicable to high power transformers and power switchgear on the primary side.
  • The invention will now be described further, by way of example, with reference to the accompanying drawings, in which:
    • Figure 1(a) is a side view showing a prior-art gas insulated electrical apparatus;
    • Figure 1(b) is a plan view of the apparatus in Figure 1(a);
    • Figure 2 is a schematic circuit diagram of the apparatus shown in Figures 1(a) and 1(b);
    • Figure 3(a) is a side view showing an embodiment of a gas insulated electrical apparatus according to this invention;
    • Figure 3(b) is a plan view of the apparatus in Figure 3(a); and
    • Figure 4 is a partial sectional side view showing the details of a bushing terminal and a connection terminal for the cable.
  • In Figures 1 (a) and 1(b) and Figure 2, a gas insulated electrical apparatus of two banks is shown. Transformer coils 1a, 1b wound on magnetic cores 2a, 2b are contained in sealed housings 3a, 3b which are filled with an insulating gas such as SF6 gas. Switchgear 4a, 4b are connected between the transformer coils 1a, 1b and power cables 5a, 5b. The switchgear 4a, 4b comprises circuit breakers, 401a, 401b and disconnecting switches 402a, 402b which function to connect or disconnect the transformer coils 1a, 1 b to or from the power cables 5a, 5b; instrument current transformers 403a, 403b which detect the currents flowing through the transformer coils 1a, 1b; instrument voltage transformers 404a, 404b which detect the voltages applied to the transformer coils 1a, 1b; and ground switches 405a, 405b which earth the transformer coils 1a, 1b.
  • The sealed housings 6a, 6b contain the switchgears 4a, 4b, and are filled with an insulating gas such as SF6 gas. Bushings 7a, 7b are mounted on the sealed housings 6a, 6b so as to pass through the walls of the respective housings, and function to connect the ends 501a, 501b of the power cables 5a, 5b to the switchgears 4a, 4b. Cable boxes 8a, 8b are mounted on the sealed housings 6a, 6b. The cable boxes 8a, 8b function to protect the cable ends 501 a, 501 b from dust etc., and also to prevent live parts such as the cable ends 501 a, 501 b from being physically exposed, in order to prevent electric shock accidents.
  • Bushings 9a, 9b are mounted on the sealed housings 6a, 6b so as to pass through the walls of the housings, while primary bushings 10a, 10b are mounted on the sealed housings 3a, 3b so as to pass through a walls of the latter. Conductors 11 a, 11 b are connected between the bushings 9a, 9b and the primary bushings 10a, 10b, to connect the switchgears 4a, 4b to the transformer coils 1 a, 1b. Ducts 12a, 12b are constructed of a metal material such as sheet iron, and house the conductors 11 a, 11b b therein. In addition, these ducts have the two end parts mounted on the sealed housings 3a, 3b and the sealed housings 6a, 6b, to electrically protect the conductors 11a, 11 etc. from dust etc. and also to prevent live parts such as the conductors 11a, 11 from being physically exposed, thereby to prevent electric shock accidents.
  • Secondary bushings 13a, 13b are mounted on the sealed housings 3a, 3b so as to pass through the walls of the housings, and function to pass electrical power transformed by the transformer coils 1a, 1b. A circuit breaker 14 is connected between the power cables, 5a, 5b and a power cable 15. Electric power supplied from the power cable 15 to the power cables 5a, 5b through the circuit breaker 14 is applied to the transformer coils 1 a, 1 through the switchgears 4a, 4b and is transformed by these transformer coils 1a, 1b. Thereafter, the transformed power is drawn from the secondary bushings 13a, 13b.
  • The prior-art gas insulated electrical apparatus thus constructed necessitates ducts 12a, 12b to house the conductors 11 a, 11 b being the connective conductors between the transformer coils 1a, 1 and the switchgears 4a, 4b; and the primary bushings 10a, 10b and the bushings 9a, 9b which are respectively mounted on the sealed housings 3a, 3b and the sealed housings 6a, 6b so as to pass through the walls thereof. This has led to the disadvantage that the apparatus becomes large in size. Moreover, in order to inspect the switchgear 4a, the circuit breaker 14 must be opened. This has led to the drawback that power supply is cut off on the side of the switchgear 4b, also.
  • This invention seeks to mitigate the disadvantages of the prior art as stated above, and provides a gas insulated electrical apparatus in which the switchgear 4a or 4b and the transformer coils 1a a or 1b are contained in a single sealed housing, and in which the power cables 5a and 5b are detachably connected to the switchgears 4a and 4b. Hereinbelow, an embodiment of this invention will be described with reference to the drawings.
  • Figure 3(a) is a side view showing an embodiment of the gas insulated electrical apparatus according to this invention, while Figure 3(b) is a plan view corresponding to Figure 3(a). Figure 4 is a partial sectional side view showing the details of a bushing terminal and a line side terminal device. In these figures, portions corresponding to those in Figures 1(a) and 1(b) are respectively assigned the same reference numerals.
  • Referring to Figures 3(a) and 3(b) and Figure 4, sealed housings 3A, 3B respectively contain the two transformer coils 1a, 1b and the switchgears 4a, 4b and are each filled with an insulating gas such as SF6 gas. The bushing terminals 16a, 16b are male in form in the present embodiment. These bushing terminals 16a and 16b are supported by the bushings 7a, 7b and have convex parts attheir respective fore ends. Flanges 17a, 17b are formed integrally with the bushings 7a, 7b and are mounted on walls of the sealed housings 3A, 3B. Connecting terminals 18a, 18b on the cable side function to detachably connect the power cables 5a, 5b to the bushing terminals 16a, 16b. As illustrated in Figure 4, the terminals 18a, 18b comprise female form connective terminals 181a, 181b which are connected to the cable ends 501a, 501 b and which are connected to the convex parts at the fore ends of the bushing terminals 16a, 16b with the latter received snugly therein. Bushings 183a, 183b serve to mount the connective terminals 181a, 181b on cable boxes 182a, 182b; and cable beds 184a, 184b (Figures 3(a) and 3(b)) which support the power cables 5a, 5b. Wheels 19 are mounted on the sealed housing 3A, 3B and function to allow the sealed housings to be moved.
  • In the gas insulated electrical apparatus thus constructed, the transformer coil la or 1b andthe switchgear 4a or 4b are contained in a single sealed housing 3A or 3B, and the transformer coil 1a a or 1 and the switchgear 4a or 4b are directly connected by means of the conductor 11 a or 11 b. Accordingly, the ducts 12a, 12b and the primary bushings 10a, 10b as well as the bushings 9a, 9b as in the prior-art apparatus shown in Figures 1 (a) and 1(b) are not required, and the apparatus can be reduced in overall size. Further, the sealed vessels 3A, 3B are provided with the wheels 19. Therefore, in order to inspect the switchgear 4a, the bushing terminals 16a and the connective terminals 181a may be separated by moving the sealed vessel 3A to the right as viewed in Figures 3(a) and 3(b). Thus, the switchgear 4a can be inspected without opening the circuit breaker 14 shown in Figure 2, and the power supply on the side of the sealed housing 3B need not be cut off. Although, in the embodiment illustrated in Figures 3(a) and 3(b), the wheels 19 are mounted on the sealed vessels 3A, 3B, it could equally be the line side connection terminals 18a, 18b that are rendered movable to allow disconnection.
  • As set forth above, the transformer coils and the switchgear are contained in single sealed housing, allowing the apparatus to be made small in size, and the ducts of the prior-art apparatus to be dispensed with, which also brings about the benefit that the apparatus is reduced in cost. Furthermore, the power cables and the switchgears are detachably connected, so that when the gas insulated electrical apparatus is arranged in a plurality of banks, it is possible to disconnect only a desired one or ones of the switchgears from the power cables.

Claims (4)

1. A gas insulated electrical apparatus including a transformer (1a, 2a; 1b, 2b) housed in an insulating gas-filled sealed container (3a, 3b), power switching means (4a, 4b) housed in an insulating gas-filled sealed container (4a, 4b) and connected to a primary coil of said transformer, a bushing terminal passing through a wall of the sealed enclosure that contains the switching means and connected to said switching means (4a, 4b), and a first bushing (7a, 7b) fixed to said sealed enclosure and supporting said bushing terminal and projecting towards the outside of said sealed enclosure, characterised in that the transformer (1 a, 2a; 1 b, 2b) and the power switching means (4a, 4b) on its primary side are enclosed in a common insulating gas-filled sealed container (3A, 3B), that a cable box (182a, 182b) is installed adjacent to said sealed container (3A, 3B), an end of a cable (5a, 5b) is housed within said cable box, a connection terminal (181 a, 181 b) is joined to said cable end and is capable of connection to said bushing terminal (16a, 16b), and a second bushing (183a, 183b) is fixed to said cable box and supports said connection terminal, and is capable of engaging said first bushing (7a, 7b).
2. A gas insulated electrical apparatus as claimed in claim 1 characterised in that at least one of said sealed container (3A, 38) or said cable box (182a, 182b) is constructed so as to be movable, said movement enabling engagement and disengagement of said bushing terminal (16a, 16b) and said connection terminal (181a, 181 b).
3. A gas insulated electric apparatus as claimed in claim 1 or 2, characterised in that said bushing terminal (16a, b) connected to said switchgear (4a, b) is male in form, while said connection terminal (181a, b) of said cable is female in form.
4. A gas insulated electrical apparatus as claimed in claim 3, characterised in that said bushing terminal (16a, b) connected to said switchgear is formed unitarily with its bushing (7a, b), which has a flange (17a, b) mounted on the sealed container wall.
EP19810304665 1980-10-07 1981-10-07 Gas insulated electrical apparatus Expired EP0049641B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP55140745A JPS5765208A (en) 1980-10-07 1980-10-07 Gas insulated substation
JP140745/80 1980-10-07

Publications (2)

Publication Number Publication Date
EP0049641A1 EP0049641A1 (en) 1982-04-14
EP0049641B1 true EP0049641B1 (en) 1985-03-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810304665 Expired EP0049641B1 (en) 1980-10-07 1981-10-07 Gas insulated electrical apparatus

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EP (1) EP0049641B1 (en)
JP (1) JPS5765208A (en)
DE (1) DE3169189D1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60124208U (en) * 1984-01-27 1985-08-21 株式会社明電舎 switchgear
JPS6177608U (en) * 1984-10-29 1986-05-24
JPH0681370B2 (en) * 1985-03-15 1994-10-12 三菱電機株式会社 Gas insulated switchgear
DE9404007U1 (en) * 1994-03-10 1994-05-05 Ritz Messwandler Kg Power converter

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR740907A (en) * 1933-02-03
FR1194377A (en) * 1959-11-09
GB225666A (en) * 1923-10-11 1924-12-11 David Reginald Davies Improvements in or relating to electrical switch gear
US2100721A (en) * 1936-06-26 1937-11-30 Westinghouse Electric & Mfg Co Buried type distribution transformer
FR1126583A (en) * 1955-05-17 1956-11-26 Racking-in device for transformers and similar devices
GB1196249A (en) * 1966-11-21 1970-06-24 Electro Mechanical Mfg Company Improvements in or relating to Electrical Transformer Feeder Pillars or like Units
JPS4928591U (en) * 1972-06-14 1974-03-12
JPS533625B2 (en) * 1972-10-20 1978-02-08
JPS518181A (en) * 1974-07-11 1976-01-22 Nippon Asbestos Co Ltd Kensakukakoseino yoitainetsutaimamoseisekimenrooruyosekimenkiban
JPS533625U (en) * 1976-06-22 1978-01-13
JPS5543691Y2 (en) * 1976-06-28 1980-10-14
JPS55122408U (en) * 1979-02-22 1980-08-30

Also Published As

Publication number Publication date
JPS5765208A (en) 1982-04-20
EP0049641A1 (en) 1982-04-14
DE3169189D1 (en) 1985-04-11
JPH0132723B2 (en) 1989-07-10

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