GB378434A - Improvements in and relating to protective arrangements for electric systems - Google Patents

Improvements in and relating to protective arrangements for electric systems

Info

Publication number
GB378434A
GB378434A GB4160/31A GB416031A GB378434A GB 378434 A GB378434 A GB 378434A GB 4160/31 A GB4160/31 A GB 4160/31A GB 416031 A GB416031 A GB 416031A GB 378434 A GB378434 A GB 378434A
Authority
GB
United Kingdom
Prior art keywords
neutral
class
inductive
operating frequency
resistance
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
GB4160/31A
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.)
British Thomson Houston Co Ltd
Original Assignee
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB378434A publication Critical patent/GB378434A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H02H3/14—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 occurrence of voltage on parts normally at earth potential

Landscapes

  • Regulation Of General Use Transformers (AREA)
  • Ac-Ac Conversion (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

378,434. Protective arrangements for supply systems and apparatus. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of Palueff, K. K. ; 18, Laflin Terrace, Pittsfield, Massachusetts, U.S.A.) Feb. 10, 1931, No. 4160. Convention date, Feb. 10, 1930. [Class 38 (iv).] The neutral point of a system comprising an inductive winding or windings is connected to ground by parallel circuits comprising respectively an impedance and a non-inductive path such that for currents of the operating frequency the neutral is either effectively' isolated or grounded through a predetermined impedance by the former and is solidly earthed for transient oscillations by the latter, the passage to earth of current of normal operating frequency then being prevented. The first mentioned may be a condenser, an inductance or a resistance, and the second may consist of or include a resistance having a negative volt-ampere characteristic such as is described in Specification 292,110, [Class 38 (iv), Electric supply and transmission systems &c]. A spark gap set to break down at a voltage materially in excess of the highest operating frequency voltage of the neutral may be connected in series with the non- inductive path. The preferred arrangement is shown in the Figure, in which the neutral is connected to earth through parallel paths comprising respectively a condenser 28 and inductance 33 and a non-inductive resistance 30 in series with a spark gap 29. The invention is applicable to systems employing transformers of the type described in Specifications 173,606, 178,609. [both in Class 38 (iv), Electric supply and transmission systems &c.], and 350,520, having shielded or non-resisting windings 21.
GB4160/31A 1930-02-10 1931-02-10 Improvements in and relating to protective arrangements for electric systems Expired GB378434A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US378434XA 1930-02-10 1930-02-10

Publications (1)

Publication Number Publication Date
GB378434A true GB378434A (en) 1932-08-10

Family

ID=21896681

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4160/31A Expired GB378434A (en) 1930-02-10 1931-02-10 Improvements in and relating to protective arrangements for electric systems

Country Status (1)

Country Link
GB (1) GB378434A (en)

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