GB677658A - Improvements relating to frequency-responsive electric relays - Google Patents

Improvements relating to frequency-responsive electric relays

Info

Publication number
GB677658A
GB677658A GB617850A GB617850A GB677658A GB 677658 A GB677658 A GB 677658A GB 617850 A GB617850 A GB 617850A GB 617850 A GB617850 A GB 617850A GB 677658 A GB677658 A GB 677658A
Authority
GB
United Kingdom
Prior art keywords
frequency
improvements relating
predominance
switch
current
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
GB617850A
Inventor
Richard Woolliscroft Haigh
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.)
ZF International UK Ltd
Original Assignee
Joseph Lucas 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
Application filed by Joseph Lucas Ltd filed Critical Joseph Lucas Ltd
Priority to GB617850A priority Critical patent/GB677658A/en
Publication of GB677658A publication Critical patent/GB677658A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/30—Electromagnetic relays specially adapted for actuation by ac
    • H01H51/32—Frequency relays; Mechanically-tuned relays

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Relay Circuits (AREA)

Abstract

677,658. Electromagnetic relays. LUCAS, Ltd., J. Feb. 22, 1951. [March 11, 1950] No. 6178/50. Class 38 (v). A frequency responsive relay has two windings i, j acting in opposition and respectively connected through rectifiers e, g to two differently tuned circuits a, band b<SP>1</SP>, a<SP>1</SP> arranged in series between A.C. supply terminals c. The core k of the relay is polarized, and when the frequency of the supply reaches a predetermined amount the predominance of the current in one winding i causes the switch h to be closed and at another frequency the predominance of the current in the other winding causes the switch to be re-opened under the action of a spring. Specification 623,970 is referred to.
GB617850A 1950-03-11 1950-03-11 Improvements relating to frequency-responsive electric relays Expired GB677658A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB617850A GB677658A (en) 1950-03-11 1950-03-11 Improvements relating to frequency-responsive electric relays

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB617850A GB677658A (en) 1950-03-11 1950-03-11 Improvements relating to frequency-responsive electric relays

Publications (1)

Publication Number Publication Date
GB677658A true GB677658A (en) 1952-08-20

Family

ID=9809828

Family Applications (1)

Application Number Title Priority Date Filing Date
GB617850A Expired GB677658A (en) 1950-03-11 1950-03-11 Improvements relating to frequency-responsive electric relays

Country Status (1)

Country Link
GB (1) GB677658A (en)

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