GB329986A - Improvements in or relating to the measurement of thermal conditions in electrical apparatus - Google Patents

Improvements in or relating to the measurement of thermal conditions in electrical apparatus

Info

Publication number
GB329986A
GB329986A GB629629A GB629629A GB329986A GB 329986 A GB329986 A GB 329986A GB 629629 A GB629629 A GB 629629A GB 629629 A GB629629 A GB 629629A GB 329986 A GB329986 A GB 329986A
Authority
GB
United Kingdom
Prior art keywords
thermometer
bulb
eddy currents
magnetic
transformer
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
GB629629A
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 ELECTRIC TRANSFORMER C
Original Assignee
BRITISH ELECTRIC TRANSFORMER C
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 ELECTRIC TRANSFORMER C filed Critical BRITISH ELECTRIC TRANSFORMER C
Priority to GB629629A priority Critical patent/GB329986A/en
Publication of GB329986A publication Critical patent/GB329986A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H02H5/047—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a temperature responsive switch
    • H02H5/048—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a temperature responsive switch additionally responsive to excess current due to heating of the switch

Landscapes

  • General Induction Heating (AREA)

Abstract

329,986. British Electric Transformer Co., Ltd., and Whish, A. C. Feb. 26, 1929. Thermometers.-A means for measuring the highest temperature of the windings of a transformer or other electrical apparatus comprises a thermometer immersed in the cooling fluid surrounding the apparatus and additionally heated by eddy currents or hysteresis effects or both produced in the material of the thermometer itself or in a mass of magnetic' or non-magnetic conducting material placed adjacent the thermometer and within the magnetic field produced by the transformer current or a current proportional thereto. Figs. 5 and 6 show a constructional arrangement. in which the bulb 1 of the thermometer is made of magnetic material and forms part of a magnetic circuit comprising a U-shaped laminated core 5 magnetized by a winding or conductor 5a carrying the transformer current. The thermometer bulb is adjustably mounted in order that the air gap in the magnetic circuit may be varied, additional control of the characteristics and range of the thermometer being obtained by providing on the core auxiliary windings 6, 6a that are short-circuited through an adjustable impedance. Modifications are described in which the additional heating is effected by (i) eddy currents induced directly in the expansion medium of a mercury thermometer, (ii) eddy currents or hysteresis losses produced directly in a metal bulb containing the expansion medium, (iii) eddy currents or hysteresis losses produced directly in a metal sleeve surrounding the the,rmometer bulb, (iv) eddy currents or hysteresis losses produced in a metal sleeve surrounding the thermometer bulb and forming a part of a magnetic circuit energized by the transformer current or a current proportional thereto.
GB629629A 1929-02-26 1929-02-26 Improvements in or relating to the measurement of thermal conditions in electrical apparatus Expired GB329986A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB629629A GB329986A (en) 1929-02-26 1929-02-26 Improvements in or relating to the measurement of thermal conditions in electrical apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB629629A GB329986A (en) 1929-02-26 1929-02-26 Improvements in or relating to the measurement of thermal conditions in electrical apparatus

Publications (1)

Publication Number Publication Date
GB329986A true GB329986A (en) 1930-05-26

Family

ID=9811909

Family Applications (1)

Application Number Title Priority Date Filing Date
GB629629A Expired GB329986A (en) 1929-02-26 1929-02-26 Improvements in or relating to the measurement of thermal conditions in electrical apparatus

Country Status (1)

Country Link
GB (1) GB329986A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3106842A (en) * 1959-06-05 1963-10-15 Westinghouse Electric Corp Thermally responsive device for electrical apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3106842A (en) * 1959-06-05 1963-10-15 Westinghouse Electric Corp Thermally responsive device for electrical apparatus

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