GB277954A - Method of and means for demagnetising alternating current dynamo electric machines - Google Patents

Method of and means for demagnetising alternating current dynamo electric machines

Info

Publication number
GB277954A
GB277954A GB23651/27A GB2365127A GB277954A GB 277954 A GB277954 A GB 277954A GB 23651/27 A GB23651/27 A GB 23651/27A GB 2365127 A GB2365127 A GB 2365127A GB 277954 A GB277954 A GB 277954A
Authority
GB
United Kingdom
Prior art keywords
transformer
mains
machine
excitation
opposing
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
GB23651/27A
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.)
Siemens Schuckertwerke AG
Siemens AG
Original Assignee
Siemens Schuckertwerke AG
Siemens AG
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 Siemens Schuckertwerke AG, Siemens AG filed Critical Siemens Schuckertwerke AG
Publication of GB277954A publication Critical patent/GB277954A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
    • H02P9/12—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for demagnetising; for reducing effects of remanence; for preventing pole reversal
    • H02P9/123—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for demagnetising; for reducing effects of remanence; for preventing pole reversal for demagnetising; for reducing effects of remanence

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)
  • Synchronous Machinery (AREA)

Abstract

277,954. Siemens - Schuckertwerhe Akt.-Ges., (Assignees of Siemens-Schuckertwerke Ges.). Sept. 22, 1926, [Convention date]. Protective or safety devices, auxiliary; regulation of exciting machines; alternating-current induction machines.-In order to effect rapid demagnetization of an alternating - current machine, the excitation is supplied by the difference of two opposing fields, the greater of which can be caused to disappear automatically in dependence upon change of state in the mains or in the machine. Fig. 1 shows the invention applied to an asynchronous generator 1 feeding mains 2. The excitation for the generator is derived from a compensated commutator exciter 4, the rotor of which is fed from the opposing secondary windings of two transformers 6, 7 the primaries of which are connected to the mains 2. The effect of the transformer 7 preponderates throughout the range of regulation of the transformer 6, but if the mains voltage rises above a predetermined value, a switch 8 opens the primary circuit of the transformer 7 and the excitation of the machine 4 is derived wholly from the transformer 6 and consequently is reversed. In the case of a synchronous machine, the continuous-current exciter has a regulatable shunt field winding and an opposing and preponderating winding fed at constant voltage, the circuit of which can be opened automaticaly as in the first described example.
GB23651/27A 1926-09-22 1927-09-08 Method of and means for demagnetising alternating current dynamo electric machines Expired GB277954A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE277954X 1926-09-22

Publications (1)

Publication Number Publication Date
GB277954A true GB277954A (en) 1928-03-29

Family

ID=6028418

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23651/27A Expired GB277954A (en) 1926-09-22 1927-09-08 Method of and means for demagnetising alternating current dynamo electric machines

Country Status (1)

Country Link
GB (1) GB277954A (en)

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