GB289538A - Improvements relating to leakage indicators for alternating current circuits - Google Patents

Improvements relating to leakage indicators for alternating current circuits

Info

Publication number
GB289538A
GB289538A GB251327A GB251327A GB289538A GB 289538 A GB289538 A GB 289538A GB 251327 A GB251327 A GB 251327A GB 251327 A GB251327 A GB 251327A GB 289538 A GB289538 A GB 289538A
Authority
GB
United Kingdom
Prior art keywords
circuit
relay
transformers
rectifying
current circuits
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
GB251327A
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 Mobility Ltd
Original Assignee
Westinghouse Brake and Signal Co Ltd
Westinghouse Brake and Saxby Signal 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 Westinghouse Brake and Signal Co Ltd, Westinghouse Brake and Saxby Signal Co Ltd filed Critical Westinghouse Brake and Signal Co Ltd
Priority to GB251327A priority Critical patent/GB289538A/en
Publication of GB289538A publication Critical patent/GB289538A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H02H3/16—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 fault current to earth, frame or mass

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

289,538. Peter, L. H., and Westing- house Brake & Saxby Signal Co., Ltd. Jan. 28, 1927. Detecting and indicating faults. - A leakage indicator for alternating-current circuits comprises a transformer or a rectifying device connected between each of the circuit conductors and earth and arranged to actuate a relay operating an indicator. As shown the primary 3, 7 of transformers 4, 8 are connected between the circuit conductors 1, 5 respectively and earth. The secondary windings 11, 15 of the transformers 4, 8 are connected to the diagonally opposite points of rectifying systems 12, 16 respectively, the other pairs of diagonally opposite points being connected to relay windings 13, 17. Normally the armatures 19, 20 of both relays 13, 17 are attracted and close the circuit of a green lamp 24 between supply terminals 23, 25. On the occurrence of a fault on one of the mains 1, 5, the corresponding primary winding is more or less short-circuited causing de-energization of the associated relay and thereby closing the circuit of one or other of the red lamps 28, 29. In a modification the transformers 4, 8 are omitted, the mains 1, 5 being connected directly to the rectifying systems 12, 16. Regulating resistances may be included in circuit with the relay winding 13, 17. The rectifying units are preferably of the metal oxide type described in Specification 257,305.
GB251327A 1927-01-28 1927-01-28 Improvements relating to leakage indicators for alternating current circuits Expired GB289538A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB251327A GB289538A (en) 1927-01-28 1927-01-28 Improvements relating to leakage indicators for alternating current circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB251327A GB289538A (en) 1927-01-28 1927-01-28 Improvements relating to leakage indicators for alternating current circuits

Publications (1)

Publication Number Publication Date
GB289538A true GB289538A (en) 1928-04-30

Family

ID=9740884

Family Applications (1)

Application Number Title Priority Date Filing Date
GB251327A Expired GB289538A (en) 1927-01-28 1927-01-28 Improvements relating to leakage indicators for alternating current circuits

Country Status (1)

Country Link
GB (1) GB289538A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2585734A (en) * 1948-01-02 1952-02-12 Fred J Bucher Leakage indicator and protective equipment for direct current distributing circuits
US2623107A (en) * 1949-10-04 1952-12-23 Westinghouse Air Brake Co Ground detecting apparatus
US2660717A (en) * 1949-12-22 1953-11-24 Herman A Hood Electrical ground detector
US2697217A (en) * 1953-03-17 1954-12-14 Crouse Hinds Co Ground detecting apparatus
US2907016A (en) * 1953-07-23 1959-09-29 Petcar Res Corp Short circuit and grounding indicator for flame detector systems
US3218622A (en) * 1962-12-03 1965-11-16 Birtcher Corp Ground fault detector
US3641548A (en) * 1969-02-17 1972-02-08 Larry A Groce Overcurrent-fault indicator apparatus for trunk lines of an electrical power distribution system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2585734A (en) * 1948-01-02 1952-02-12 Fred J Bucher Leakage indicator and protective equipment for direct current distributing circuits
US2623107A (en) * 1949-10-04 1952-12-23 Westinghouse Air Brake Co Ground detecting apparatus
US2660717A (en) * 1949-12-22 1953-11-24 Herman A Hood Electrical ground detector
US2697217A (en) * 1953-03-17 1954-12-14 Crouse Hinds Co Ground detecting apparatus
US2907016A (en) * 1953-07-23 1959-09-29 Petcar Res Corp Short circuit and grounding indicator for flame detector systems
US3218622A (en) * 1962-12-03 1965-11-16 Birtcher Corp Ground fault detector
US3641548A (en) * 1969-02-17 1972-02-08 Larry A Groce Overcurrent-fault indicator apparatus for trunk lines of an electrical power distribution system

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