US3736437A - Vacuum switch apparatus - Google Patents

Vacuum switch apparatus Download PDF

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Publication number
US3736437A
US3736437A US00105933A US3736437DA US3736437A US 3736437 A US3736437 A US 3736437A US 00105933 A US00105933 A US 00105933A US 3736437D A US3736437D A US 3736437DA US 3736437 A US3736437 A US 3736437A
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US
United States
Prior art keywords
vacuum switch
electrodes
resistor
capacitor
circuit
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 - Lifetime
Application number
US00105933A
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English (en)
Inventor
A Nabae
M Okawa
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.)
Toshiba Corp
Original Assignee
Tokyo Shibaura Electric Co 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
Priority claimed from JP260470A external-priority patent/JPS5132232B1/ja
Application filed by Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Application granted granted Critical
Publication of US3736437A publication Critical patent/US3736437A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01H33/02—Details
    • H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
    • 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

Definitions

  • a vacuum switch apparatus comprising a vacuum switch having a pair of electrodes, and a series circuit consisting of a resistor and capacitor disposed between one of said electrodes and ground to suppress the oscillation of abnormal voltage generated at the opening of said switch.
  • the resistor preferably has a value of 100 ohms and the capacitor preferably has a value of 0.1;LF.
  • the present invention relates to a vacuum switch apparatus.
  • Vacuum switches and vacuum breakers have broad applications due to their excellent dielectric recovery and extinction characteristics and easy maintenance.
  • switches of such type cause an abnormal voltage to be generated by current chopping or reignition at the opening of the switch, with the result that a load is subject to damage due to the abnormal voltage.
  • Appearance of abnormal voltages due to current chopping may be eliminated using electrode materials in which there takes place a low degree of current chopping.
  • the cause is not clearly defined and there have not yet been proposed fully satisfactory countermeasures, with the result that the load is still subject to damage due to generation of abnormal voltage at the opening of the switch, particularly that resulting from reignition.
  • FIG. 1 represents the case where there was used a conventional vacuum switch in the circuit of an induction motor.
  • numeral 11 denotes a power source, 12 a vacuum switch, 13 an induction motor, 14 source inductance, 15 source stray capacity, 16 line stray inductance and 17 load side stray capacity.
  • the present invention has been accomplished by taking countermeasures for the fact that said phenomenon of reignition originates, as described above, with the L-C circuit included in the switch circuit. It is accordingly the object of the invention to provide a vacuum switch wherein there is provided a high frequency oscillation control circuit on the switch so as to prevent the generation of abnormal voltage at its opening.
  • a vacuum switch apparatus including a series connection of a capacitor and resistor which is connected between one of the electrodes of vacuum switch and ground or between the electrodes, to suppress the oscillation of abnormal voltages generated at the opening of the switch.
  • FIG. 1 is an equivalent circuit diagram representing the case where there is used a prior art vacuum switch
  • FIG. 2 shows the wave form of load side voltage appearing at the time of reignition in the circuit of FIG.
  • FIG. 3 indicates the wave form of voltage occurring across the switch electrodes at the time of reignition in the circuit of FIG. 1;
  • FIG. 4 illustrates a vacuum switch circuit according to an embodiment of the present invention
  • FIGS. 5 and 6 are equivalent circuit diagrams of FIG.
  • FIG. 7 is a co-ordinate representation showing the values of the capacitor and resistor constituting high frequency oscillation control means used in the vacuum switch of the present invention.
  • FIG. 8 presents the wave form of load the circuit of FIG. 4 when it is opened
  • FIG. 9 shows the wave form of voltage across the switch electrodes in the circuit of FIG. 4 when it is opened.
  • FIGS. 10 and 11 are circuit diagrams using vacuum switches according to other embodiments of the invention.
  • numeral 30 represents a vacuum switch which is connected to a power source 33 and load 34 through cables 31 and 32 respectively.
  • the load side electrode of the vacuum switch 30 is grounded through a series circuit consisting of a resistor 35 and capacitor 36.
  • This series circuit constitutes side voltage in 3 high frequency oscillation control means 37 which effectively controls the oscillation of abnormal voltage which would progressively increase with repetition of reignition occurring at the opening of the vacuum switch 30.
  • FIG. 10 there are connected a series connection of a capacitor 36 and resistor 35 between the paired electrodes of the vacuum switch 30 to constitute high frequency oscillation control circuits 37.
  • FIG. 11 shows a circuit for a short circuit test of the vacuum switch apparatus according to this invention.
  • One electrode of the paired electrodes of each vacuum switch 30 is grounded through a high frequency control circuit 37 and connected through a cable 31 and reactor 43 to respective ones of output terminals of a short circuit generator 42, and the other electrode of each vacuum switch 30 is grounded.
  • the vacuum switch including the control circuit of the present invention effectively prevents the generation of abnormal voltage.
  • the high frequency oscillation control circuit 37 consisting of resistors 35 and capacitors 36 may be integrally placed in a cubicle together with the vacuum switch to render it compact.
  • a vacuum switch apparatus comprising at least one vacuum switch having a pair of electrodes and an RC surge suppressor circuit coupled between one of said electrodes and ground, said surge suppressor circuit being comprised of a series connection of a resistor R and a capacitor C, the values of said resistor R and capacitor C satisfying the following:
  • n C/Ce
  • m Ce/Cs
  • q l+n+m
  • Ce load side stray capacity
  • Cs source side stray capacity
  • Lo line stray inductance
  • a vacuum switch apparatus comprising three RC surge suppressor circuits, and wherein said vacuum switch is of the three phase type having three pairs of electrodes, one electrode of each pair being connected to ground through a respective RC surge suppressor circuit.
  • a vacuum switch apparatus comprising test means connected to said surge suppressor circuit for a short circuit test thereof.
  • a vacuum switch apparatus according to claim 1 wherein said resistor is chosen to have a resistance of ohms and said capacitor to have a capacity of 0.1ILF.
  • a vacuum switch apparatus comprising at least one vacuum switch having a pair of electrodes and an RC surge suppressor circuit coupled between said electrodes, said surge suppressor circuit being comprised of a series connection of a resistor R and a capacitor C, the values of said resistor R and capacitor C satisfying the following:
  • n C/Ce
  • m Ce/Cs
  • q 1+n+m and circuit being connected between respective pairs of said switch electrodes.
  • a vacuum switch apparatus according to claim 5 wherein said resistor is chosen to have a resistance of ohms and said capacitor to have a capacity of

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Measuring Fluid Pressure (AREA)
  • Lasers (AREA)
US00105933A 1970-01-08 1971-01-12 Vacuum switch apparatus Expired - Lifetime US3736437A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP260470A JPS5132232B1 (de) 1970-01-08 1970-01-08
US10593371A 1971-01-12 1971-01-12

Publications (1)

Publication Number Publication Date
US3736437A true US3736437A (en) 1973-05-29

Family

ID=26336027

Family Applications (1)

Application Number Title Priority Date Filing Date
US00105933A Expired - Lifetime US3736437A (en) 1970-01-08 1971-01-12 Vacuum switch apparatus

Country Status (3)

Country Link
US (1) US3736437A (de)
CH (1) CH520397A (de)
GB (1) GB1332233A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4953206A (en) * 1986-11-17 1990-08-28 At&T Bell Laboratories Methods of and apparatus for providing substantially error-free transmitted data
US5257157A (en) * 1990-05-04 1993-10-26 Epstein Barry M Protector network for A-C equipment
US20080067980A1 (en) * 2006-08-24 2008-03-20 General Atomics Method and Apparatus for Using Momentary Switches in Pulsed Power Applications
DE102022207958A1 (de) 2022-08-02 2024-02-08 Siemens Energy Global GmbH & Co. KG RC-Anordnungen zum Schalten von induktiven Strömen mit Hochspannungs-Vakuumschaltern

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB275966A (en) * 1926-08-10 1928-03-01 Siemens Ag Improvements in or relating to lead-in insulators, particularly for electric apparatus
US2547614A (en) * 1948-09-24 1951-04-03 Gen Electric Saturable reactor arc prevention circuit
US3383519A (en) * 1963-12-23 1968-05-14 Westinghouse Electric Corp Electric power distribution systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB275966A (en) * 1926-08-10 1928-03-01 Siemens Ag Improvements in or relating to lead-in insulators, particularly for electric apparatus
US2547614A (en) * 1948-09-24 1951-04-03 Gen Electric Saturable reactor arc prevention circuit
US3383519A (en) * 1963-12-23 1968-05-14 Westinghouse Electric Corp Electric power distribution systems

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Rovnyak, R. M.; Arc, Surge, and Noise Suppression; Electronic s World; May, 1967. *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4953206A (en) * 1986-11-17 1990-08-28 At&T Bell Laboratories Methods of and apparatus for providing substantially error-free transmitted data
US5257157A (en) * 1990-05-04 1993-10-26 Epstein Barry M Protector network for A-C equipment
US20080067980A1 (en) * 2006-08-24 2008-03-20 General Atomics Method and Apparatus for Using Momentary Switches in Pulsed Power Applications
DE102022207958A1 (de) 2022-08-02 2024-02-08 Siemens Energy Global GmbH & Co. KG RC-Anordnungen zum Schalten von induktiven Strömen mit Hochspannungs-Vakuumschaltern
WO2024028115A1 (de) * 2022-08-02 2024-02-08 Siemens Energy Global GmbH & Co. KG Rc-anordnungen zum schalten von induktiven strömen mit hochspannungs-vakuumschaltern

Also Published As

Publication number Publication date
CH520397A (de) 1972-03-15
GB1332233A (en) 1973-10-03

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