US1889479A - Electric switch - Google Patents

Electric switch Download PDF

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Publication number
US1889479A
US1889479A US274898A US27489828A US1889479A US 1889479 A US1889479 A US 1889479A US 274898 A US274898 A US 274898A US 27489828 A US27489828 A US 27489828A US 1889479 A US1889479 A US 1889479A
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US
United States
Prior art keywords
coil
current
switch
force
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
US274898A
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English (en)
Inventor
Keller Robert
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.)
BBC Brown Boveri AG Germany
Original Assignee
Bbc Brown Boveri & Cie
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 Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US1889479A publication Critical patent/US1889479A/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
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2472—Electromagnetic mechanisms with rotatable armatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2454—Electromagnetic mechanisms characterised by the magnetic circuit or active magnetic elements

Definitions

  • the release of ordinary electric switches is usually effected by causing the force of a spring or weight to act on the movable switch contact, which force is made inoperative by lockin means durin normal workin and is b 23 D released on the current limit being exceeded by the said locking means being released.
  • the switch is then immediately opened. although this takes place only after these moving masses have been accelerated.
  • it would suiiice to increase the force of the spring weights cannot suitably be used for quick-acting switches, owing to the masses to be accelerated).
  • a spring of increased strength entails a greater friction on the releasing mechanism, which again demands an increase in the releasing force.
  • Fig. 1 represents the diagram of connections of a quick-acting switch
  • Figs. 2 and 3 two different constructional forms of a part of the switch
  • Figs. 4 and 5 a further modification, such as is suitable for releasing reverse current
  • Fig. 6 shows a modification of the system of Fig. 1.
  • a trip release and an electro-dynamic release, acting on the movable switch member a which, when closed, rests against the fixed switch contact brush 5.
  • the shaft of the switch is composed of two parts 0 and d.
  • the movable switch member a is mounted rigidly on the part 0 of the shaft and is connected to the other part d of the same by means of a free-wheel coupling or by a similarly acting spring 6 which is fixed to a pin 8 in the switch member a.
  • On the part d of the shaft is also mounted a driving lever r.
  • the releasing spring f of the trip gear is attached to the lever g mounted on the part (i of the shaft, which lever is held in the switched in position by the detent k.
  • the electric coupling 6 (or the free-wheel mechanism) between the shafts c and d may be made capable of being locked at will.
  • the short circuit winding referred to above lies in the air gap Z of a three-limbed magnet core n which is energized by the main current winding m, which air gap is concentric with the rotary shaft 0 of the rotating coil 70.
  • a short circuit current proportional to the change in the field is induced in the rotary coil by transformer action, which short circuit current acts in opposition to the change in the field.
  • the coil 76 shall exert, even on ycurrent increases occurring below the maximum point, atorque which reduces the contact pressure between a and I) or even causes the switch to open for a short time. In this case the force of the spring e causes the smswitch to close again each time before the are between the switch contacts is broken. It is also possible to make the arrangement such,
  • the iron circuit for the coil 70 may be divided into two separate circuits n and a, each of which is energized by its own energizing coil m and m and :1which are arranged on either side of the coil shaft 0, say symmetrical to the same.
  • Fig. 4 shows in a constructional form of switch operating gear which acts only with reverse current, the magnet core for the transformer induction of the driving coil which is coupled to the shaft 0 of the switch in elevation, and the magnetic circuit for producing the motion of the coil is in section
  • Fig. 5 shows a plan view of the same arrangement, the magnet core first referred to being in section and the magnetic circuit for producing the motion of the coil is in elevation.
  • the coil m through which the main current flows, is interlinked with the short circuit winding is by the laminated iron core a which in this case has no air gap.
  • the longitudinal sides of the coil 70 lie in the air gap Z of a stationarv iron circuitcomposed of two parts 0 and p which is energized from an I external source of the winding 9.
  • the iron circuit 0, go is so arranged that the coil is when at rest, the switch a, 6 being closed, lies approximately at the edge of the air gap Z.
  • the two magnetic circuits are furthermore so energized that, on a reverse current occurring in the main circuit, to which the switch a, b and the coil m belong, the coil in may be drawn into the air gap Z while in the case of a normal current it will be repelled out of the said air gap.
  • the arrows shown in Figs. 1- and 5 apply to the former case.
  • the switch contact a (Fig. 1) will be operated in the opening direction, on an increase in the reverse current occurring.
  • the reverse current dying down again before having reached the necessary height for releasing the detent k, the
  • a particular advantage of this arrangement is that the switch a, b can be closed at full load, without there being any danger of its being released again through the sudden considerable change in current, as through the increase in current in the forward direction, the coil is moved in the closing direction of the switch.
  • the maximum current release f, g, i, h of the switch a, b is of course intended to act with both directions of current, in order to prevent overloads and the burning out of the machines or apparatus to be protected.
  • the combination last described is particularly suitable for rectifier plants. In such plants it will act selectively in the case of backignitions, that is only that rectifier will be disconnected, in which a heavy back ignition is occurring. In the case of lighter back ignitions in which the reverse current does not reach the maximum current limit, no final disconnection will take place at all, the switch being opened only during the increase in the reverse current and immediately closed again on the reverse current decreasing. Such an action of the arrangement is required in practice in connection with rectifier plants.
  • the transformer transmission of a changing current to the rotary coil can also be effected by means of a transformer as shown in Fig. 6.
  • the rotary coil 70 which is coupled to the shaft 0 of the switch is fed by means of the transformer 23.
  • a transformer 11 may be used for energizing the magnetic field having the motor action, in front of the primary to which a resistance a may be inserted and the secondary of which feeds the magnet winding 9.
  • Such a way of operating the switch a, I) may be so arranged as to act only in the case of reverse current.
  • a switch adapted for quick release including a fixed contact, a movable switch member carrying a movable contact, resilient means tending to force apart said contacts, a
  • locking device holding said contacts together against the force of the said resilient means and additional means independent of said locking device and tending to force apart said contacts in dependence upon the rate of change of current through said contacts.
  • a device as claimed in claim 1, wherein said additional means comprises a rotary coil coupled to the movable switch member and located in the air gap of a magnetic circuit.
  • said additional means comprising a rotary coil coupled to the movable switch member and located in the air gap of a magnetic circuit and a coil in series with said current to produce flux in said magnetic circuit.
  • said additional means comprising a rotary coil coupled to the movable switch member and located in the air gap of a magnetic circuit, and a coil in series with said current to produce flux in said magnetic circuit, which is magnetically linked with the rotary coil so that the coil energized by the current through the switch contacts induces current in the rotary coil.
  • said additional means comprising a rotary coil coupled to the movable switch member and located in the air gap of a magnetic circuit, and a coil in series with said current to produce flux in said magnetic circuit, which is magnetically linked with the rotary coil so that the coil energized by the current through the switch contacts induces current in the rotary coil, which is short circuited on itself.
  • said additional means comprising a rotary coil coupled to the movable switch member and located in the air gap of a magnetic circuit, and a coil in series with said current to produce flux in said magnetic circuit, which is magnetically linked with the rotary coil so that the coil energized by the current through the switch contacts induces current in the rotary coil, which is short circuited on itself and consists of a single turn.
  • said additional means comprises a rotary coil coupled to the movable switch member and located in the air gap of amagnetic circuit, said magnetic circuit being magnetically linked with the rotary coil so that change of flux in said magnetic circuit tends to rotate the rotary coil.
  • said additional means comprises a rotary coil coupled to the movable switch member and located in the air gap of a magnetic circuit, said magnetic circuit being magnetically linked with the rotary coil so that change of flux in said magnetic circuit tends to rotate the rotary coil, and said magnetic circuit is arranged symmetrically with respect to the rotary coil.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
US274898A 1927-05-07 1928-05-03 Electric switch Expired - Lifetime US1889479A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1889479X 1927-05-07

Publications (1)

Publication Number Publication Date
US1889479A true US1889479A (en) 1932-11-29

Family

ID=4566662

Family Applications (1)

Application Number Title Priority Date Filing Date
US274898A Expired - Lifetime US1889479A (en) 1927-05-07 1928-05-03 Electric switch

Country Status (5)

Country Link
US (1) US1889479A (en))
CH (1) CH127386A (en))
DE (1) DE564769C (en))
FR (1) FR653850A (en))
NL (1) NL24832C (en))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2631190A (en) * 1950-04-17 1953-03-10 Pacific Electric Mfg Corp Circuit breaker latch mechanism
US3215796A (en) * 1960-12-19 1965-11-02 Siemens Ag Electrodynamic drive for synchronous circuit interrupters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2631190A (en) * 1950-04-17 1953-03-10 Pacific Electric Mfg Corp Circuit breaker latch mechanism
US3215796A (en) * 1960-12-19 1965-11-02 Siemens Ag Electrodynamic drive for synchronous circuit interrupters

Also Published As

Publication number Publication date
DE564769C (de) 1932-11-23
NL24832C (en))
FR653850A (fr) 1929-03-28
CH127386A (de) 1928-09-01

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