GB1471998A - Arrangement for warning of the departure from a predetermined relationship of currents in an electrical supply system - Google Patents

Arrangement for warning of the departure from a predetermined relationship of currents in an electrical supply system

Info

Publication number
GB1471998A
GB1471998A GB3705974A GB3705974A GB1471998A GB 1471998 A GB1471998 A GB 1471998A GB 3705974 A GB3705974 A GB 3705974A GB 3705974 A GB3705974 A GB 3705974A GB 1471998 A GB1471998 A GB 1471998A
Authority
GB
United Kingdom
Prior art keywords
currents
departure
warning
arrangement
supply system
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
GB3705974A
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.)
English Electric Co Ltd
Original Assignee
English Electric Co 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 English Electric Co Ltd filed Critical English Electric Co Ltd
Priority to GB3705974A priority Critical patent/GB1471998A/en
Publication of GB1471998A publication Critical patent/GB1471998A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G01R27/18—Measuring resistance to earth, i.e. line to ground

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

1471998 Monitoring currents ENGLISH ELECTRIC CO 23 May 1975 [23 Aug 1974] 37059/74 Heading H2K A system for indicating departure from a predetermined interrelationship of the currents in a plurality of conductors comprises a plurality of current transformers 1, one in each conductor, whose secondaries are connected to an ammeter movement 3 which is arranged to operate a switch when the moving part reaches a certain position. To detect earth leakage in a polyphase system, the transformer secondaries are connected in parallel and through a rectifier 2 to a moving coil meter. The moving coil carries a vane which passes, at one point, between two adjustablypositioned coils. A switching circuit actuated by the change in mutual inductance of the coils controls a buzzer and lamps 4, 7, 8. An unbalancing network 9-12 enables the system to be tested.
GB3705974A 1975-05-20 1975-05-20 Arrangement for warning of the departure from a predetermined relationship of currents in an electrical supply system Expired GB1471998A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3705974A GB1471998A (en) 1975-05-20 1975-05-20 Arrangement for warning of the departure from a predetermined relationship of currents in an electrical supply system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3705974A GB1471998A (en) 1975-05-20 1975-05-20 Arrangement for warning of the departure from a predetermined relationship of currents in an electrical supply system

Publications (1)

Publication Number Publication Date
GB1471998A true GB1471998A (en) 1977-04-27

Family

ID=10393419

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3705974A Expired GB1471998A (en) 1975-05-20 1975-05-20 Arrangement for warning of the departure from a predetermined relationship of currents in an electrical supply system

Country Status (1)

Country Link
GB (1) GB1471998A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee