EP1768149B1 - Multi circuit selecting switchgear - Google Patents

Multi circuit selecting switchgear Download PDF

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Publication number
EP1768149B1
EP1768149B1 EP20060020018 EP06020018A EP1768149B1 EP 1768149 B1 EP1768149 B1 EP 1768149B1 EP 20060020018 EP20060020018 EP 20060020018 EP 06020018 A EP06020018 A EP 06020018A EP 1768149 B1 EP1768149 B1 EP 1768149B1
Authority
EP
European Patent Office
Prior art keywords
fixed
solid insulator
vacuum chamber
vacuum
outer case
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.)
Not-in-force
Application number
EP20060020018
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1768149A1 (en
Inventor
Takashi c/o Hitachi Ltd. Sato
Kenji c/o Hitachi Ltd. Tsuchiya
Satoru c/o Hitachi Ltd. Kajiwara
Masato Kobayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP1768149A1 publication Critical patent/EP1768149A1/en
Application granted granted Critical
Publication of EP1768149B1 publication Critical patent/EP1768149B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H01H2033/6665—Details concerning the mounting or supporting of the individual vacuum bottles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H01H33/6661—Combination with other type of switch, e.g. for load break switches

Definitions

  • the present invention relates to a multi circuit selecting switchgear using vacuum interrupters for switching among power source lines.
  • a multi circuit selecting switchgear has been represented by what is known as a gas-insulated-type multi circuit selecting switchgear. But this gas insulated type demands a lot of work in the maintenance against the degradation of insulating gas. Besides, since insulating gas is inferior in withstand voltage ability to solid insulators, it is demanded to enlarge the distance between phases regarding three-phase conductors, particularly when a total number of circuits is three or more as in the case where there are two power source lines and one load line.
  • a vacuum interrupter is used to construct a multi circuit selecting switchgear.
  • This vacuum interrupter has a vacuum chamber constructed by sealing with a shield end plate either open end of an insulated cylinder.
  • a fixed contact connected to a fixed holder penetrating the shield end plate at one open end and a moving contact connected to a moving holder penetrating the shield end plate at the other open end.
  • These electric contacts are placed facing each other, with arc shields placed like surrounding them.
  • a moving side bus bar is in contact with the moving holder, and the outside of the vacuum chamber is covered with a solid-insulator molding axially throughout from the fixed side end (fixed holder side) to the moving side end (moving holder side).
  • An earthed outer case capsulates the whole space through the moving side of the vacuum chamber including the moving side bus bar and is fastened and fixed on the solid insulator, and being filled with insulating gas therein.
  • Document EP 1 150 405 discloses a device according to the preamble of claim 1.
  • Patent Document 1 Japanese Patent application Laid-open publication No. 2002-15645
  • the outside of the vacuum chamber has been given a solid-insulator molding that covers it axially throughout from the fixed side end to the moving side end.
  • the solid insulator located between the vacuum chamber and the earthed outer case has its end face receiving in the surface directions the application of a great electric field strength equivalent to power source voltage.
  • the object of the present invention is to provide a multi circuit selecting switchgear capable of reducing the electric field strength applied to the solid insulator that puts a vacuum chamber to a molded and insulated state due to its molding and thus of size reduction.
  • a multi circuit selecting switchgear characterized in that a vacuum chamber constructed by sealing with a shield end plate either open end of an insulated cylinder has a molded and insulated state due to a solid-insulator molding that covers a part of the insulated cylinder axially from the fixed side.
  • a multi circuit selecting switchgear characterized in that the solid insulator axially covers the insulated cylinder where an electric contact (fixed contact or moving contact) and an arc shield have a smaller capacitance in between than that between an arc shield and the earthed outer case.
  • the capacitance between arc shields and an earthed outer case is made greater than that between electric contacts and arc shields by having a molded and insulated state due to a molding that covers a part of an insulated cylinder, thus it is possible to lessen the distributed voltages of the arc shields and the earthed outer case. It is further possible to lessen the electric field strength applied to the solid insulator in its surface directions, and to lessen the thickness of the solid insulator, which makes a smaller-size multi circuit selecting switchgear possible.
  • a vacuum chamber is constructed by sealing with a shield end plate either open end of an insulated cylinder.
  • a fixed contact is connected to a fixed holder penetrating the shield end plate at one open end, and a moving contact is connected to a moving holder penetrating the shield end plate at the other open end.
  • These electric contacts are placed facing each other.
  • In the vacuum chamber there are arc shields placed like surrounding the electric contacts (fixed and moving contacts).
  • a moving side bus bar is in contact with the moving holder outside the vacuum chamber.
  • a solid insulator gives a molded and insulated state due to its molding that covers axially from the fixed side end of the vacuum chamber a part of the insulated cylinder.
  • An earthed outer case capsulates the vacuum chamber through the moving side end and is fastened and fixed on the solid insulator, and filled with insulating gas therein.
  • a place of the solid insulator axially covers the insulated cylinder, where the electric contacts and the arc shields have a smaller capacitance in between than that between the arc shields and the earthed outer case.
  • Figures 1 to 4 illustrate a first embodiment of the invention.
  • Figure 1 is a longitudinal sectional view.
  • Figure 2 is a sectional view taken along the line A - A of Figure 1 .
  • Figure 3 is a top view of Figure 2 .
  • Figure 4 is an enlarged sectional view of the principal part. Note that Figures 1 to 4 illustrate an embodiment according to which three circuits are addressed, but an earthing switch oriented vacuum interrupter is provided additionally, a frame to house a multi circuit selecting switchgear according to the invention omitted from illustration.
  • Figure 4 shows a heavy dash and dotted line for a good understanding of the effects of the invention that will be mentioned later.
  • a vacuum interrupter 1 is made up of a vacuum chamber 2 constructed by sealing with shield end plates 4 and 5 the open ends of an insulated cylinder 3.
  • the vacuum interrupter 1 is made up of a fixed contact 6 connected to the end of a fixed holder 7 penetrating the shield end plate 5 shown to be the lower one in the drawing.
  • a moving holder 9 penetrates the other shield end plate 4 and is positioned above and coaxial to the fixed holder 7.
  • the fixed contact 6 faces the moving holder 9 whose end has a moving contact 8 connected and fixed to it.
  • the moving contact 8 and fixed contact 6 are positioned facing each other.
  • the fixed contact 6 and the moving contact 8 have their contact electrodes surrounded by arc shields 10.
  • the moving holder 9 is exposed outside the vacuum chamber 2 and is connected through an operating rod 11 to an operating device 12.
  • the operating device 12 is provided with an operating mechanism (not shown in the drawing) for the opening and closing between the moving contact 8 and fixed contact 6.
  • the moving holder 9 has a vertical movement, against which the vacuum of the vacuum chamber 2 is secured by using a bellows 13 made of stainless steel.
  • the moving holder 9 is in contact outside the vacuum chamber 2 with a moving side bus bar 14.
  • the moving side bus bar 14 has a sliding contact shoe, through which it is electrically connected to the moving holder 9.
  • the moving side bus bar 14, as shown in Figure 1 is in contact with the moving holder 9 for each of the three vacuum interrupters 1a, 1b and 1c of the same phase.
  • the vacuum chamber 2 has a molded and insulated state due to a solid insulator 15 molding that covers a part of the insulated cylinder 3 axially (vertically) from the fixed side.
  • the solid insulator 15 gives a molded and insulated state due to a molding in a position (upper position) 15a that covers the insulated cylinder 3 axially so that the capacitance between the fixed contact 6 or the moving contact 8 and the arc shields 10 can be smaller than that between the arc shields 10 and the earthed outer case 16.
  • Figures 1 , 2 and 4 show cases where the upper position 15a of the solid insulator 15 is positioned in the vertical vicinity of the lower ends of the arc shields 10.
  • the earthed outer case 16 capsules the vacuum interrupters 1a, 1b and 1c through the moving side of the vacuum chamber 2 including the moving side bus bar 14 and its lower opening port was fastened and fixed on the solid insulator 15.
  • the earthed outer case 16 is filled with insulating gas.
  • the solid insulator 15 retains the three vacuum interrupters 1a, 1b and 1c, which are housed inside the earthed outer case 16 filled with insulating gas.
  • the operating rods 11 for the vacuum interrupters 1a, 1b and 1c are connected inside the earthed outer case 16 to the moving holder 9, penetrate the earthed outer case 16 and are connected to the operating device 12.
  • Switch units 26 are each made up of the vacuum interrupters 1a to 1c for their respective phases U, V and W, the earthed outer case 16 and other components. These units are, as shown in Figure 2 , placed in a row for three phases.
  • the solid insulator 15 has its lower portion formed tapering toward the lower end and is fastened to a cable head 17.
  • the fixed holder 7 is in contact with a fixed side bus bar 24 and is connected through the cable head 17 to a cable 18.
  • the solid insulator 15 has an earthed layer 19 formed around it.
  • the vacuum interrupter 1 is provided, as shown in Figures 2 and 4 , adjacent with an earthing-switch-oriented vacuum interrupter 20.
  • the vacuum interrupter 20 is, like the vacuum interrupter 1, retained by the solid insulator 15.
  • the vacuum interrupter 20 has its fixed side connected through a bus bar 21 to the fixed holder 7 of the vacuum interrupter 1 and its moving side connected through an operating rod 22 to an operating device 23.
  • a multi circuit selecting switchgear constructed in the manner so far described operates in conventional manners, thus there will only be necessity for outlined description.
  • Single-line connection for one phase will be shown in Figure 5 . It is assumed that the vacuum interrupter 1c has its fixed side connected to a load line L and that the vacuum interrupters 1a and 1b have their fixed side connected to power source lines A and B different from each other.
  • the vacuum interrupters 1 (1a, 1b and 1c) are driven by the operating devices 12 (12a, 12b and 12c) in a pair of the same alphabet.
  • the load line L is supplied with electricity by closing for each phase the vacuum interrupter 1c and then the vacuum interrupter 1a.
  • the vacuum interrupter 1c has its fixed side connected to the load line L, which is supplied with electricity by the power source line A that the vacuum interrupter 1a has its fixed side connected to.
  • Supplying the load line L with electricity from the load line B is carried out by opening the vacuum interrupter 1a for each of the phases U, V and W and then closing the vacuum interrupter 1b. In this manner, multi circuit selecting and switching is possible.
  • the operation of the vacuum interrupter 20 is carried out by operating devices 23 (23a, 23b and 23c).
  • the vacuum interrupter 1 is made up of the vacuum chamber 2, to which the solid insulator 15 gives a molded and insulated state due to a molding that covers a part of the insulated cylinder 3 axially from the fixed side of the vacuum chamber 2.
  • simulation analysis has given the electric equipotential surface distribution shown in Figures 6 to 8 .
  • Figure 6 illustrates an electric equipotential surface distribution when the solid insulator 15 is a molding in a position (a height) covering the shield end plate 5 of the vacuum chamber 2 and also a part of the insulated cylinder 3.
  • the electric equipotential surface distribution shows that the shorter the line interval is the greater the electric field strength is. Note that the structure and the analytical result can be easily compared by seeing the left half of Figure 6 , which shows the structure bounded by the heavy dash and dotted line in Figure 4 .
  • the arc shields 10 and the earthed outer case 16 have the solid insulator 15 inserted partially between them, they have a rise of capacitance in between.
  • the electric potential of the arc shields 10 is inversely proportional to the capacitance between the electric contacts (the fixed contact 6 and the moving contact 8), namely the fixed holder 7 (the moving holder 9), and the arc shields 10 and that between the arc shields 10 and the earthed outer case 16.
  • the potential of the arc shields 10 is reduced to 56 percent, a value closer to that of the earthed outer case 16.
  • the solid insulator 15 is joined to the insulated cylinder 3 at a junction 50 whose potential is 43 percent.
  • Figure 7 illustrates an electric equipotential surface distribution when the solid insulator 15 is a molding in a position as high as below the shield end plate 5 of the vacuum chamber 2.
  • the electric potential of the arc shields 10 is 65 percent, a value a little greater than in the case shown in Figure 6 . Since the center axis side of the solid insulator 15 is in contact with the fixed holder 7, the potential at the junction 50 is 100 percent.
  • Figure 8 illustrates an electric equipotential surface distribution when the solid insulator 15 is a molding in a position as high as the upper end of the insulated cylinder 3 of the vacuum chamber 2.
  • the electric potential of the arc shields 10 is 35 percent, a value much smaller than in the case shown in Figure 6 . Since the solid insulator 15 is in contact with the shield end plate 4, the potential at the junction 50 is 100 percent.
  • Figure 9 is a graph of characteristics showing the three cases in Figures 6 to 8 compared in which the path from the junction 50 where the solid insulator 15 is joined to the insulated cylinder 3 toward a junction 51 where the solid insulator 15 is joined to the earthed outer case 16 has an electric equipotential surface distribution.
  • the origin is designated for the junction 50, the horizontal axis is for the reach of the path toward the earthed outer case 16, and the vertical axis is for the logarithm-indicated relative values of electric field strength distribution.
  • Characteristic a is an electrical field strength distribution in the case shown in Figure 6 where the solid insulator 15 is a molding in a position covering a part of the insulated cylinder 3
  • Characteristic b is an electrical field strength distribution in the case shown in Figure 7 where the solid insulator 15 is a molding in a position as high as below the fixed side shield end plate 5
  • Characteristic c is an electrical field strength distribution in the case shown in Figure 8 where the solid insulator 15 is a molding in a position as high as the upper end of the insulated cylinder 3, namely, covering the whole.
  • Figure 10 illustrates a second embodiment of the invention.
  • the difference from the first embodiment lies in that a moving side bus bar 25 is made up of a flexible conductor.
  • this second embodiment it is possible to lessen the electric field strength applied to the solid insulator 15 in its surface directions, and at the same time to do without providing the moving side bus bar 25 with a sliding contact and thus to lessen the number of parts.
  • Figures 11 to 13 illustrate a third embodiment of the invention.
  • Figure 11 is a longitudinal sectional view
  • Figure 12 is a sectional view taken along the line B - B of Figure 11
  • Figure 13 is a top view of Figure 12 .
  • the vacuum interrupters 1a, 1b and 1c for each of the phases are used as a circuit breaker, an earthing switch and a disconnector respectively.
  • the vacuum interrupters 1a to 1c for each of the phases U, V and W and earthed outer cases 16 and other components make up switch units 26 (26U, 26V and 26W), which are, as shown in Figure 12 , positioned in a row for the three phases.
  • the vacuum interrupter 1a as circuit breakers, the vacuum interrupter 1b as earthing switches and the vacuum interrupter 1c as disconnectors are opened or closed in a bundle for the three phases by operating devices 12a, 23b and 23c respectively.
  • the single phase connecting diagram for one phase according to the third embodiment is, regarding the vacuum interrupters 1a to 1c, one as shown in Figure 14 .
  • Figures 15 and 16 illustrate a fourth embodiment of the invention.
  • the earthed outer case 16 in the third embodiment is constructed into a 3-phase circuit bundled type. Inside the earthed outer case 16, vacuum interrupters 1a to 1c for each of the phases U, V and W are placed.
  • this fourth embodiment it is possible to lessen the electric field strength applied to the solid insulator 15 for two phases, and at the same time to integrate the insulating gas areas into one and thus effectwise simplify the structure.

Landscapes

  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Gas-Insulated Switchgears (AREA)
EP20060020018 2005-09-27 2006-09-25 Multi circuit selecting switchgear Not-in-force EP1768149B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005278990A JP4234125B2 (ja) 2005-09-27 2005-09-27 多回路選択開閉装置

Publications (2)

Publication Number Publication Date
EP1768149A1 EP1768149A1 (en) 2007-03-28
EP1768149B1 true EP1768149B1 (en) 2008-11-19

Family

ID=37564972

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060020018 Not-in-force EP1768149B1 (en) 2005-09-27 2006-09-25 Multi circuit selecting switchgear

Country Status (6)

Country Link
EP (1) EP1768149B1 (zh)
JP (1) JP4234125B2 (zh)
CN (1) CN100568434C (zh)
DE (1) DE602006003709D1 (zh)
SG (1) SG131084A1 (zh)
TW (1) TW200715330A (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4555857B2 (ja) * 2007-12-21 2010-10-06 株式会社日立製作所 真空絶縁スイッチギヤ
JP4764906B2 (ja) 2008-08-12 2011-09-07 株式会社日立製作所 真空スイッチ及び真空スイッチギヤ
KR101494790B1 (ko) 2013-05-15 2015-02-23 엘에스산전 주식회사 고체절연스위치기어의 소호 부 장치
JP2023028398A (ja) * 2021-08-19 2023-03-03 株式会社日立産機システム ガス絶縁開閉装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56114234A (en) * 1980-02-14 1981-09-08 Meidensha Electric Mfg Co Ltd Vacuum switching device
US4527028A (en) * 1984-06-27 1985-07-02 Joslyn Mfg. And Supply Co. Modular vacuum interrupter
JP3756025B2 (ja) * 1999-10-04 2006-03-15 株式会社東芝 スイッチギア
JP4537569B2 (ja) * 2000-04-24 2010-09-01 三菱電機株式会社 真空絶縁スイッチギヤ及びその製造方法

Also Published As

Publication number Publication date
EP1768149A1 (en) 2007-03-28
TWI307905B (zh) 2009-03-21
TW200715330A (en) 2007-04-16
CN100568434C (zh) 2009-12-09
DE602006003709D1 (de) 2009-01-02
SG131084A1 (en) 2007-04-26
CN1941245A (zh) 2007-04-04
JP4234125B2 (ja) 2009-03-04
JP2007095316A (ja) 2007-04-12

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