GB626114A - Improvements in protective arrangements for polyphase electrical apparatus - Google Patents

Improvements in protective arrangements for polyphase electrical apparatus

Info

Publication number
GB626114A
GB626114A GB21232/47A GB2123247A GB626114A GB 626114 A GB626114 A GB 626114A GB 21232/47 A GB21232/47 A GB 21232/47A GB 2123247 A GB2123247 A GB 2123247A GB 626114 A GB626114 A GB 626114A
Authority
GB
United Kingdom
Prior art keywords
disc
switch
switches
contacts
phase
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
GB21232/47A
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.)
Metals and Controls Corp
Original Assignee
Metals and Controls Corp
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 Metals and Controls Corp filed Critical Metals and Controls Corp
Publication of GB626114A publication Critical patent/GB626114A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/02—Making articles shaped as bodies of revolution discs; disc wheels
    • B21H1/04—Making articles shaped as bodies of revolution discs; disc wheels with rim, e.g. railways wheels or pulleys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H81/00—Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting
    • H01H81/02—Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting electrothermally operated
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for three-phase systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermally Actuated Switches (AREA)

Abstract

626,114. Protective cut-out arrangements; thermal switches. METALS & CONTROLS CORPORATION. Aug. 5, 1947, No. 21232. Convention date, Sept. 15, 1939 [Class 38(v)] A protective arrangement for an energy translating device such as a poly-phase motor utilizes two thermally-actuated, doublepole switches, each having a single snapaction bowed bimetallic disc 4 electrically welded to a supporting plate 2. The disc 4 has a contact button 10 which co-operates with a second fixed plate 11 to form one " pole " of the switch, and a screw 6 rotatably engages the centre of the disc to permit the adjustment of the operating temperature. The other " pole " of the switch is formed by a resilient blade 14 carrying a contact 16 which co-operates with a fixed contact 17. This blade is fixed at 15 and is actuated by the disc 4 by means of an insulating push rod 13. The disc is heated by a heating coil 20, by the current flowing through the disc and if the switch is fixed on or in the motor, by the heat of motor. Fig 1 shows the use of two switches to protect the delta connected windings 29 of a three-phase motor, the connections being such, that the opening of either switch under overload conditions interrupts the current in all three phases. In this example the disc 4, the element 20 and the contacts 10, 11 of each switch are connected in series with a supply line and the contacts 16, 17 of both switches are connected in the third supply line. This arrangement may also be applied to apparatus having windings connected in star or two-phase three-wire apparatus, Figs. 6 and 7 (not shown). In a further embodiment, Fig. 5 (not shown) the two switches are used to protect a two-phase four-wire apparatus, each winding being connected in series with the contacts 10, 11 of one switch and the contacts 16, 17 of the other switch.
GB21232/47A 1939-09-15 1947-08-05 Improvements in protective arrangements for polyphase electrical apparatus Expired GB626114A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US626114XA 1939-09-15 1939-09-15

Publications (1)

Publication Number Publication Date
GB626114A true GB626114A (en) 1949-07-08

Family

ID=22043630

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21232/47A Expired GB626114A (en) 1939-09-15 1947-08-05 Improvements in protective arrangements for polyphase electrical apparatus

Country Status (1)

Country Link
GB (1) GB626114A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1180454B (en) * 1961-01-19 1964-10-29 Victor Graves Vaughan Heat protection switch for electric motors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1180454B (en) * 1961-01-19 1964-10-29 Victor Graves Vaughan Heat protection switch for electric motors

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