US1805497A - Electric switch - Google Patents

Electric switch Download PDF

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Publication number
US1805497A
US1805497A US3?16?A US32816128A US1805497A US 1805497 A US1805497 A US 1805497A US 32816128 A US32816128 A US 32816128A US 1805497 A US1805497 A US 1805497A
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US
United States
Prior art keywords
contacts
contact
switch
current
movable
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
US3?16?A
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English (en)
Inventor
William E Paul
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US3?16?A priority Critical patent/US1805497A/en
Priority to GB38947/29A priority patent/GB339133A/en
Priority to FR687116D priority patent/FR687116A/fr
Application granted granted Critical
Publication of US1805497A publication Critical patent/US1805497A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/18—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • 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
    • H01H33/593—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 for ensuring operation of the switch at a predetermined point of the AC cycle

Definitions

  • My invention relates to electric switches and particularly to switches for interrupting modern alternating current .commercial power circuit.
  • Switches commonly used for controlling such-circuits have their contacts power that may be interrupted by such a' switch is dependent to a large extent upon the amount of gas that-is formed by the are drawn between the contacts before it is finally extinguished. Any means therefore that will lfireduce, the amount of gas formeddn the switch or prevent it entirely is an important factor in effecting the interruption of the circuit.
  • Another object of my invention is to provide improved means for causing any are that maybe drawn between the contacts of the final break-to be transferred quickly from the contacts and the contacts to become insulated from each otherby a layer of the insulating liquid.
  • Another object of my invention is the provisionof a liquid break switch having main and arcing contacts and improved means for expelling laterally from the main contacts and the switch operating means any are and gas formed at the arcing contacts.
  • A; further object of my invention is the provision of a liquid break switch. whereni the circuit is broken simultaneously ata plurality of points in series, the arcs at. the several points being expelled laterally and the cooperating contacts immediately insulated from each other by insulatingliquid.
  • Fig. 1 is 'a view partly in section and partly in elevation of a switch embodying my invention the parts being shown in close circuit position; Fig. 2
  • FIG. 1 is a sectional View f a portion of the same taken 011 theline 2-2; F i". 3 is similar to Fig. 1 except that it shows the switch in open circuit'p'osition; Fig. 4 is across sectional view'of Fig. 3 showingthemovable arcing contacts; Fig. 5 is a circuit diagram; and- Fig. 6 illustrates a modification. 7 Through the top of the enclosing vessel 1 containing insulating liquid extend the 1nsulatingbushings 2 connected by braces 3 and surrounding-the studs 4: in accordance with well known oil switch construction. At-
  • each bushing 2 is number of chambers, in the present case three,
  • each coil comprising the coil 10 formed of several turnsof fiat conductor around the core 11 and secured to the ends of each core are the plates 12 forming pole pieces, the sh ape of the plates being indicated by dotted lines in Fig. 1.
  • One end. of each coil connects with one of the fixed arcing contacts 13 arranged between the pole pieces 12.
  • each chamber of the housings has the curved wall and is shaped v to form an arc chute, the coil being protected by the wall from the arc.
  • the conducting arc runner 16 whichconnects at its lower end with the fixed contact 13.
  • That part of the housing forming the lower wall of the are chute has an opening to receive the movable arcing contact 17 and is provided withthe barrier 18 below which isthe conductin member 19.
  • This .member- is slidably. secure to the housin' by the bolt 20 and is pressed against the si e of the movable contact 17 by the spring 21.
  • the operating rod 25, the-lower portion at least of which is of insulating material, has I secured to it the main current ca'rryin bridge 26 and the arcing contact bridge 2
  • Bridge 27 comprises two transverse metal plates 30 fixed to the oper ating rod and having lateral projections bolted to the three pairs of insulating plates .31. At each end of each pairof plates there is secured the sleeve 32in which slides, the
  • I movable arcing contact 17 I movable arcing contact 17.
  • lvlg'yement of contact 17 in its sleeve is limited the pin 33 fixed in the sleeve engaging the ends of the slot 34 in the-contact.
  • Coil spring 36 mount- .ed within the contact between the upper end thereof and the pin holds the cooperating arcing cont acts together during the initial opening movement of the switch.
  • bracket 37 secured tothe bridge 31 is pivoted the arm 38 at the opposite end of which is the pawl 39 and on the side facingthe pawl the contact 17 has a series of teeth or notches 40 forming a ratchet adapted to be engaged by the pawl.
  • the arm At its pivot endthe arm is connected to the contact 17 by the flexible conductor 41 and at its opposite end it is connected by flexible conductor 42 to member 43 of the bridge.
  • blow-out coils In addition to its effect in expelling the arcs into the chutes, the blow-out coils also a zero value.
  • the movable contact is held in engagement with the. fixed contact by the electromagnetic force of the current travel-s ing contact, however, comprises the bridging member secured at its central portion to the operating rod 25 and having the con tacts 51 pivoted to the respective ends thereof. As illustrated, the ends of the bridging member are turned up at right angles and the adjacent portion of the contact extends parallel to the bridging member-or substan tially so. A loop is thereby formed at each end of the bridging member. While the switch is being moved to open circuit position the electromagnetic effect 'ofthese loops is to cause the cooperating contacts to remain in engagement with each other as long as the instantaneous value of the currentwave is not at or near zero. force of the current on each contact is opposed by the spring 52 which connects the bridging member and contact mechanically though preferably not electrically, the spring.
  • the electromagnetic force of the current in small ar c that may occur at this time. is quick- 1y expelled into the arc chute and extinguished as already described,
  • the movable contact also iscovere'd by cool-insulating liq- The electromagnetic uid as already described which prevents a re-establishment of the arc.
  • My switch has been used to break currents up' to a dead short circuit at voltages ranging from approximately 15,000 volts to 96,000
  • the-switch showedno signs of distress. with-a multiple break switch.
  • the arrangement for extinguishing the arc is so effective that the average break for these tests was within approximately one half cycle ofi a twentyfive cycle wave and with an approximate break distance of only about two inches -when the arc was interrupted, although the switch utilized on these tests did not embody the means on the movable contacts. for ensuring final separation of the contacts at or-nearthe 'zero value of the current wave.
  • Apparatus for interrupting an alternating current at or near the zero value thereof comprising cooperating fixed and movable contacts, conducting means forming a loop in circuit with the contacts including a movable portion arrangedto control the separation of the contacts, and means for yieldingly opposing the electromagneticeffect of the cu'rrent in said loop.
  • Apparatus for interrupting an alter-. nating current at or near the zero value thereof comprising cooperating fixed and movable contacts, conducting means including a mov 1 able member forming aloop in series with said contacts for controllin the separation thereof and a spring engaging the movable loop.
  • Apparatus for interrupting an alternating current at or near the zero value thereof comprising cooperating fixed and movable contacts, conducting means in circuit therewith including a movable portion arrangedto control the separationof thej c0ntacts,'and' a blow-out coil for an are drawn between said contacts arranged to affect said movable portion.
  • Apparatus for interrupting an alternat ing current at or nearithe zero value thereof comprising cooperating fixed and movable contacts, an operating member for the movable contact having a loose mechanical connection therewith and ineans responsive to a predetermined low instantaneous value of the current for making said connection fixed.
  • Apparatus for interrupting an-alternating current at or near the zero value thereof comprising cooperating fixed and movable 7 contacts, a member for movingv the movable contactto open circuit position, means constructed to connect said member with said movable contact, and means responsive to the instantaneous values of the current for rendering said means inoperative While the greater than a predeterm ned 1ow.
  • Apparatus for interrupting an alternatin g current at or near the zero value thereof comprising cooperating contacts, a mem- 1 her for-moving oneof said contacts from the other, a clutch connection between said member and said one contact, and means respons'ive to the instantaneous values ofsaidcurrent for c'ontrolling said-clutch connection.
  • Apparatus for interrupting an alternat ing current at or near the zero value thereof comprising cooperating fixed and movable contacts, an operating member, a clutch con- I nection between said member and said movable contact, and means controlling said con-.
  • Apparatus for interrupting-an alternating current at or near the zero value thereof contacts an' operating member for the movable contact having a slidin mechanical connection therewith, means or yieldingly maintaining the movable contact in engage- I 'ment with the fixed contact when the instantaneous value of the current is above a predetermined amount and for connecting together the movable contact and the operat containing insulating liquid, a contact housing supported in said liquid having a pluing member to cause a separation of thecontacts when the instantaneous value of the current reduces amount.
  • An electric switch comprising a fixed contact, a cooperating movable contact, an operating member having a sliding connection withv the movable contact, resilient.
  • clutch means for maintaining the contacts in engagement with each other when the operating member is operated, clutch means for securing the movable contact to the operating member, and a clutch controlling arm forming a portion of a loop in the current circuitthrough the switch.
  • An electric switch comprising a pair of fixed contacts, a bridging member having contacts slidably mounted thereon for engaging the I fixed contacts, ratchet mechanism for. connecting the bridging memberv to the contacts carried thereby, ratchet controlling arms pivoted to the bridging member adja-' cent each slidable contact, and means conmeeting said arms incircuit with the slidable contacts whereby each arm forms a portion.
  • An electric s itch comprising a fixed contact. immersed 111 insulating liquid, a structure associated therewith, forming a- 'magnetic arc blow-out, and a blow-out chute therefor, a cooperating movable contact, and members in said chute connected respectively with said contacts to which member an are drawn between the contacts is adapted to be in insulating liquid, a structure associated with the fixed contact forming a magnetic blow-out and a blow-out chute therefor, said chute being closed on all but one side and having an opening on one side through which the movable contact is withdrawn, said blowout coil being arranged toexpel the arc in a direction substantially at right angles to the direction of movement of them'ovable con-v tact. 4
  • An electric switch comprising a vessel containing insulating liquid, a contact housing supported in said liquid having a plurality of chambers open at one side thereof,
  • An electric switch comprising a vessel rality of chambers open at one side thereof,
  • each of said chambers bein formed at,,that portion opposite the open si e-there'- of with a ocketforming a reservoir from which insu at'ing liquid flows to cover the movable contact after the arc-has been ex- 15.
  • An electric switch comprising a vessel containing insulating liquid, acontact housing supported in the liquid having a discharge opening atone-side thereof, a fixed 16 arcing contact and blow-out coil therefor mounted in the chamber, a cooperating mov-' fable arcing contact, mean's connecting'said blow-out coil and contacts in aseries clrcuit, a fixed main current-carrying contact se- 20 cured tothe exterior of the housing, a movable main current-carrying contact, and an operating rod for the movable main and areing contacts, the opening of said chamber being arranged to direct a discharge away from.
  • An electric switch comprising a vessel containin insulating liquid, a air of contact housings supported in the, iquid' each I ofsaid housings comprising a plurality-of similar chambers having dischargeopen-ings at the same side of the. housing, a blow-out coil and a fixed arcin contact in each. charm ber, an o crating ro movable arcing contacts carried thereby, and cooperating main current-carrying contacts said operating rod.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US3?16?A 1928-12-24 1928-12-24 Electric switch Expired - Lifetime US1805497A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US3?16?A US1805497A (en) 1928-12-24 1928-12-24 Electric switch
GB38947/29A GB339133A (en) 1928-12-24 1929-12-19 Improvements in and relating to electric switches for sparklessly interrupting alternating current circuits
FR687116D FR687116A (fr) 1928-12-24 1929-12-23 Perfectionnements aux appareils électriques tels que disjoncteurs, interrupteurs etanalogues

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3?16?A US1805497A (en) 1928-12-24 1928-12-24 Electric switch

Publications (1)

Publication Number Publication Date
US1805497A true US1805497A (en) 1931-05-19

Family

ID=23279774

Family Applications (1)

Application Number Title Priority Date Filing Date
US3?16?A Expired - Lifetime US1805497A (en) 1928-12-24 1928-12-24 Electric switch

Country Status (3)

Country Link
US (1) US1805497A (fr)
FR (1) FR687116A (fr)
GB (1) GB339133A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436665A (en) * 1944-12-27 1948-02-24 Gen Electric Electric circuit interrupter
US2748227A (en) * 1951-06-27 1956-05-29 Yorkshire Switchgear & Eng Co Electric circuit breakers
US2979589A (en) * 1956-04-09 1961-04-11 Westinghouse Electric Corp Circuit interrupters
US3198918A (en) * 1961-02-13 1965-08-03 Ite Circuit Breaker Ltd Bracing and support structure for oil circuit breakers
US3215796A (en) * 1960-12-19 1965-11-02 Siemens Ag Electrodynamic drive for synchronous circuit interrupters

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436665A (en) * 1944-12-27 1948-02-24 Gen Electric Electric circuit interrupter
US2748227A (en) * 1951-06-27 1956-05-29 Yorkshire Switchgear & Eng Co Electric circuit breakers
US2979589A (en) * 1956-04-09 1961-04-11 Westinghouse Electric Corp Circuit interrupters
US3215796A (en) * 1960-12-19 1965-11-02 Siemens Ag Electrodynamic drive for synchronous circuit interrupters
US3198918A (en) * 1961-02-13 1965-08-03 Ite Circuit Breaker Ltd Bracing and support structure for oil circuit breakers

Also Published As

Publication number Publication date
GB339133A (en) 1930-12-04
FR687116A (fr) 1930-08-05

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