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GB719219A - Improvements in or relating to polyphase current transformers for use in earth leakage protective systems - Google Patents

Improvements in or relating to polyphase current transformers for use in earth leakage protective systems

Info

Publication number
GB719219A
GB719219A GB874251A GB874251A GB719219A GB 719219 A GB719219 A GB 719219A GB 874251 A GB874251 A GB 874251A GB 874251 A GB874251 A GB 874251A GB 719219 A GB719219 A GB 719219A
Authority
GB
United Kingdom
Prior art keywords
earth leakage
leakage protective
relating
protective systems
polyphase 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
GB874251A
Inventor
Alexander Anderson
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.)
Anderson Boyes and Co Ltd
Original Assignee
Anderson Boyes and 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 Anderson Boyes and Co Ltd filed Critical Anderson Boyes and Co Ltd
Priority to GB874251A priority Critical patent/GB719219A/en
Publication of GB719219A publication Critical patent/GB719219A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/38—Instruments transformers for polyphase ac
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection
    • H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
    • H01H2083/146—Provisions for avoiding disadvantages of having asymetrical primaries, e.g. induction of a magnetic field even by zero difference current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection
    • H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

719,219. Transformers. ANDERSON, BOYES & CO., Ltd. July 14, 1952 [April 14, 1951], No. 8742/51. Class 38(2) A polyphase current transformer of the 'type having a primary winding for each phase mounted on a common magnetic core has the primary windings constituted by the cores 5A, 5B, 5C of a multicore cable 5 wound on a core 4 as a single coil. Alternatively the windings may be formed by a multicore co-axial cable. A transformer of this type is of use in earth leakage protective systems.
GB874251A 1951-04-14 1951-04-14 Improvements in or relating to polyphase current transformers for use in earth leakage protective systems Expired GB719219A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB874251A GB719219A (en) 1951-04-14 1951-04-14 Improvements in or relating to polyphase current transformers for use in earth leakage protective systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB874251A GB719219A (en) 1951-04-14 1951-04-14 Improvements in or relating to polyphase current transformers for use in earth leakage protective systems

Publications (1)

Publication Number Publication Date
GB719219A true GB719219A (en) 1954-12-01

Family

ID=9858396

Family Applications (1)

Application Number Title Priority Date Filing Date
GB874251A Expired GB719219A (en) 1951-04-14 1951-04-14 Improvements in or relating to polyphase current transformers for use in earth leakage protective systems

Country Status (1)

Country Link
GB (1) GB719219A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470496A (en) * 1967-04-19 1969-09-30 Dembling Paul G Static inverter
EP0076999A2 (en) * 1981-10-14 1983-04-20 Siemens Aktiengesellschaft Arrangement for the avoidance of fault impulses of a summation current transformer
US4524342A (en) * 1981-12-28 1985-06-18 Allied Corporation Toroidal core electromagnetic device
WO1996003760A1 (en) * 1994-07-23 1996-02-08 Delta Circuit Protection & Controls Limited Current imbalance sensor
EP0791835A2 (en) * 1996-02-20 1997-08-27 GOSSEN-METRAWATT Gesellschaft mit beschränkter Haftung Laboratory test device for isolation testing of a load connected for testing purposes
US5705971A (en) * 1993-05-14 1998-01-06 Allen-Bradley Company, Inc. Low leakage coaxial transformers
US5841616A (en) * 1994-07-23 1998-11-24 Delta Circuit Protection & Controls Limited Module for use with a miniature circuit breaker
CN104183374A (en) * 2013-05-24 2014-12-03 基思利仪器公司 Isolation transformer for use in isolated dc-to-dc switching power supply
GB2536931A (en) * 2015-03-31 2016-10-05 E2V Tech (Uk) Ltd A transformer

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470496A (en) * 1967-04-19 1969-09-30 Dembling Paul G Static inverter
EP0076999A2 (en) * 1981-10-14 1983-04-20 Siemens Aktiengesellschaft Arrangement for the avoidance of fault impulses of a summation current transformer
EP0076999A3 (en) * 1981-10-14 1985-10-16 Siemens Aktiengesellschaft Arrangement for the avoidance of fault impulses of a summation current transformer
US4524342A (en) * 1981-12-28 1985-06-18 Allied Corporation Toroidal core electromagnetic device
US5705971A (en) * 1993-05-14 1998-01-06 Allen-Bradley Company, Inc. Low leakage coaxial transformers
US5841616A (en) * 1994-07-23 1998-11-24 Delta Circuit Protection & Controls Limited Module for use with a miniature circuit breaker
WO1996003760A1 (en) * 1994-07-23 1996-02-08 Delta Circuit Protection & Controls Limited Current imbalance sensor
EP0791835A2 (en) * 1996-02-20 1997-08-27 GOSSEN-METRAWATT Gesellschaft mit beschränkter Haftung Laboratory test device for isolation testing of a load connected for testing purposes
EP0791835A3 (en) * 1996-02-20 1998-04-22 GOSSEN-METRAWATT Gesellschaft mit beschränkter Haftung Laboratory test device for isolation testing of a load connected for testing purposes
CN104183374A (en) * 2013-05-24 2014-12-03 基思利仪器公司 Isolation transformer for use in isolated dc-to-dc switching power supply
EP2806435A3 (en) * 2013-05-24 2014-12-03 Keithley Instruments, Inc. Isolation transformer for use in isolated DC-TO-DC switching power supply
US9478351B2 (en) 2013-05-24 2016-10-25 Keithley Instruments, Inc. Isolation transformer for use in isolated DC-to-DC switching power supply
GB2536931A (en) * 2015-03-31 2016-10-05 E2V Tech (Uk) Ltd A transformer
US20180277297A1 (en) * 2015-03-31 2018-09-27 Teledyne E2V (Uk) Limited Triaxial cable transformer
GB2536931B (en) * 2015-03-31 2020-03-11 Teledyne E2V Uk Ltd A transformer
US10896779B2 (en) * 2015-03-31 2021-01-19 Teledyne Uk Limited Triaxial cable transformer

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