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GB288606A - Improvements in or relating to current transformers - Google Patents

Improvements in or relating to current transformers

Info

Publication number
GB288606A
GB288606A GB10173/28A GB1017328A GB288606A GB 288606 A GB288606 A GB 288606A GB 10173/28 A GB10173/28 A GB 10173/28A GB 1017328 A GB1017328 A GB 1017328A GB 288606 A GB288606 A GB 288606A
Authority
GB
United Kingdom
Prior art keywords
currents
carrying
relating
shield
current transformers
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
GB10173/28A
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of GB288606A publication Critical patent/GB288606A/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
    • 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
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • 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)
  • Transformers For Measuring Instruments (AREA)

Abstract

288,606. International General Electric Co., Inc., (Assignees of Allgemeine Elektricitõts-Ges.). April 13, 1927, [Convention date]. Transformers. - In a current transformer for measuring the sum of the currents in several circuits, a magnetic shield d comprising several layers of sheet iron insulated from each other is placed between the core b carrying the secondary winding and the conductors a carrying the currents of the several circuits and forming the primaries. The shield is intended to prevent flux such as c linking with only one primary conductor, and is rendered more effective by a lining e of non- magnetic electrically-conducting material such as copper.
GB10173/28A 1927-04-13 1928-04-04 Improvements in or relating to current transformers Expired GB288606A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA50612D DE473614C (en) 1927-04-13 1927-04-13 Current transformer for measuring the sum of several currents

Publications (1)

Publication Number Publication Date
GB288606A true GB288606A (en) 1929-02-21

Family

ID=6937495

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10173/28A Expired GB288606A (en) 1927-04-13 1928-04-04 Improvements in or relating to current transformers

Country Status (2)

Country Link
DE (1) DE473614C (en)
GB (1) GB288606A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3683302A (en) * 1970-12-15 1972-08-08 Fred C Butler Sensor for ground fault interrupter apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7833955U1 (en) * 1978-11-13 1979-03-01 Siemens Ag, 1000 Berlin Und 8000 Muenchen Fully insulated, metal-enclosed high-voltage switchgear with single-line current transformers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3683302A (en) * 1970-12-15 1972-08-08 Fred C Butler Sensor for ground fault interrupter apparatus

Also Published As

Publication number Publication date
DE473614C (en) 1929-03-18

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