GB951318A - Improvements in or relating to power supply failure alarm circuits - Google Patents

Improvements in or relating to power supply failure alarm circuits

Info

Publication number
GB951318A
GB951318A GB4244162A GB4244162A GB951318A GB 951318 A GB951318 A GB 951318A GB 4244162 A GB4244162 A GB 4244162A GB 4244162 A GB4244162 A GB 4244162A GB 951318 A GB951318 A GB 951318A
Authority
GB
United Kingdom
Prior art keywords
potential
conductor
supply failure
relating
power supply
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
GB4244162A
Inventor
John Anthony Weeks Butcher
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB4244162A priority Critical patent/GB951318A/en
Priority to DE1962B0069653 priority patent/DE1287372B/en
Publication of GB951318A publication Critical patent/GB951318A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H02H3/24—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 undervoltage or no-voltage

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

951,318. Protective systems. STANDARD TELEPHONES & CABLES Ltd. Nov. 9, 1962, No. 42441/62. Heading H2K. If the potential difference between two conductors 1, 2 falls below a predetermined value, the potential at the tapping point of a potential divider D, R, between the conductor 1 and a conductor 3 having a reference potential of opposite polarity, falls sufficiently to change the output path of a semi-conductor switch, e.g. transistor T, from a low conduction to a high conduction condition to operate a current responsive device indicating supply failure. The upper arm D of the divider preferably takes the form of a voltage limiting device such as a Zener diode. The polarities of conductors 1, 3 may be reversed when an N-P-N instead of a P-N-P transistor is employed and the diode D is reversed.
GB4244162A 1961-11-28 1962-10-31 Improvements in or relating to power supply failure alarm circuits Expired GB951318A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB4244162A GB951318A (en) 1962-10-31 1962-10-31 Improvements in or relating to power supply failure alarm circuits
DE1962B0069653 DE1287372B (en) 1961-11-28 1962-11-16 Ball joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4244162A GB951318A (en) 1962-10-31 1962-10-31 Improvements in or relating to power supply failure alarm circuits

Publications (1)

Publication Number Publication Date
GB951318A true GB951318A (en) 1964-03-04

Family

ID=10424432

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4244162A Expired GB951318A (en) 1961-11-28 1962-10-31 Improvements in or relating to power supply failure alarm circuits

Country Status (1)

Country Link
GB (1) GB951318A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3304490A (en) * 1963-06-05 1967-02-14 Lambda Electronics Corp Monitoring circuit for regulated power supply

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3304490A (en) * 1963-06-05 1967-02-14 Lambda Electronics Corp Monitoring circuit for regulated power supply

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