GB489650A - Improvements in or relating to electric current transformers of the core-balance type - Google Patents

Improvements in or relating to electric current transformers of the core-balance type

Info

Publication number
GB489650A
GB489650A GB276537A GB276537A GB489650A GB 489650 A GB489650 A GB 489650A GB 276537 A GB276537 A GB 276537A GB 276537 A GB276537 A GB 276537A GB 489650 A GB489650 A GB 489650A
Authority
GB
United Kingdom
Prior art keywords
relating
core
electric current
current transformers
balance type
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
GB276537A
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.)
A Reyrolle and Co Ltd
Original Assignee
A Reyrolle 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 A Reyrolle and Co Ltd filed Critical A Reyrolle and Co Ltd
Priority to GB276537A priority Critical patent/GB489650A/en
Publication of GB489650A publication Critical patent/GB489650A/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
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • 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)
GB276537A 1937-01-30 1937-01-30 Improvements in or relating to electric current transformers of the core-balance type Expired GB489650A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB276537A GB489650A (en) 1937-01-30 1937-01-30 Improvements in or relating to electric current transformers of the core-balance type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB276537A GB489650A (en) 1937-01-30 1937-01-30 Improvements in or relating to electric current transformers of the core-balance type

Publications (1)

Publication Number Publication Date
GB489650A true GB489650A (en) 1938-08-02

Family

ID=9745472

Family Applications (1)

Application Number Title Priority Date Filing Date
GB276537A Expired GB489650A (en) 1937-01-30 1937-01-30 Improvements in or relating to electric current transformers of the core-balance type

Country Status (1)

Country Link
GB (1) GB489650A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001045128A1 (en) * 1999-12-16 2001-06-21 Abb Service S.R.L. Ground fault circuit breaker

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001045128A1 (en) * 1999-12-16 2001-06-21 Abb Service S.R.L. Ground fault circuit breaker

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