GB174475A - Improvements in and relating to current transformers for protective systems for electric apparatus - Google Patents

Improvements in and relating to current transformers for protective systems for electric apparatus

Info

Publication number
GB174475A
GB174475A GB3180920A GB3180920A GB174475A GB 174475 A GB174475 A GB 174475A GB 3180920 A GB3180920 A GB 3180920A GB 3180920 A GB3180920 A GB 3180920A GB 174475 A GB174475 A GB 174475A
Authority
GB
United Kingdom
Prior art keywords
transformers
current transformers
gaps
primary
magnetic 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
GB3180920A
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.)
HENRY STANLEY HOLBROOK
British Thomson Houston Co Ltd
Original Assignee
HENRY STANLEY HOLBROOK
British Thomson Houston 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 HENRY STANLEY HOLBROOK, British Thomson Houston Co Ltd filed Critical HENRY STANLEY HOLBROOK
Priority to GB3180920A priority Critical patent/GB174475A/en
Publication of GB174475A publication Critical patent/GB174475A/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
    • H01F38/30—Constructions

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Transformers For Measuring Instruments (AREA)

Abstract

174,475. British Thomson - Houston Co., Ltd., and Holbrook, H. S. Nov. 10, 1920. Regulating transformers.-In a circulating- current protective system for transformers or other electrical apparatus, in which current transformers with balanced secondary currents are placed on each side of the apparatus to be protected, the core cross-sections of the current transformers are made inversely proportional to the respective primary ampere turns under working conditions. The effective lengths of the magnetic circuits are made directly proportional to the primary ampere turns by providing one or more air gaps in the magnetic circuits. In the construction shown, the transformer core has an adjustable main air gap 2 and smaller gaps 3. The primary and secondary windings 8, 9 surround the main gap 2 in order to shield it from external influences. In a modification, the single main gap is replaced by a number of short gaps.
GB3180920A 1920-11-10 1920-11-10 Improvements in and relating to current transformers for protective systems for electric apparatus Expired GB174475A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3180920A GB174475A (en) 1920-11-10 1920-11-10 Improvements in and relating to current transformers for protective systems for electric apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3180920A GB174475A (en) 1920-11-10 1920-11-10 Improvements in and relating to current transformers for protective systems for electric apparatus

Publications (1)

Publication Number Publication Date
GB174475A true GB174475A (en) 1922-02-02

Family

ID=10328733

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3180920A Expired GB174475A (en) 1920-11-10 1920-11-10 Improvements in and relating to current transformers for protective systems for electric apparatus

Country Status (1)

Country Link
GB (1) GB174475A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2501929A1 (en) * 1981-03-10 1982-09-17 Merlin Gerin LOW VOLTAGE CIRCUIT BREAKER AND METHOD FOR MANUFACTURING A CURRENT SENSOR

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2501929A1 (en) * 1981-03-10 1982-09-17 Merlin Gerin LOW VOLTAGE CIRCUIT BREAKER AND METHOD FOR MANUFACTURING A CURRENT SENSOR
EP0061364A1 (en) * 1981-03-10 1982-09-29 Merlin Gerin Low voltage circuit breaker with adjustable hybrid triggering
US4443828A (en) * 1981-03-10 1984-04-17 Merlin Gerin Low voltage circuit breaker

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