GB1452293A - Solid state thermal overload indicator - Google Patents

Solid state thermal overload indicator

Info

Publication number
GB1452293A
GB1452293A GB4713073A GB4713073A GB1452293A GB 1452293 A GB1452293 A GB 1452293A GB 4713073 A GB4713073 A GB 4713073A GB 4713073 A GB4713073 A GB 4713073A GB 1452293 A GB1452293 A GB 1452293A
Authority
GB
United Kingdom
Prior art keywords
resistor
oct
transistors
conductor
source
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
GB4713073A
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 Canada Co
Original Assignee
Canadian General Electric Co Ltd
General Electric Canada 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 Canadian General Electric Co Ltd, General Electric Canada Co filed Critical Canadian General Electric Co Ltd
Publication of GB1452293A publication Critical patent/GB1452293A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H6/00—Emergency protective circuit arrangements responsive to undesired changes from normal non-electric working conditions using simulators of the apparatus being protected, e.g. using thermal images

Landscapes

  • Protection Of Generators And Motors (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

1452293 Motor protective systems CANADIAN GENERAL ELECTRIC CO Ltd 9 Oct 1973 [11 Oct 1972] 47130/73 Heading H2K A motor protective system has transformerresistor units 13 producing voltages proportional to the line currents and these are used to control a circuit having resistor R2 and capacitor C2 simulating the thermal characteristics of the motor between a conductor 17 and one busbar 15 of a D.C. source. Transistors Q1 and Q2 form a voltage dependent current valve circuit between conductor 17 and the other bus-bar 16 of the D.C. source and transistor Q3 forms a second such valve connected to Zener diode Z1. Under stalling or running overload a voltage is produced at 17 allowing a diode D4 to conduct, whereon transistors Q4 to Q6 will turn on and a switching signal will appear at O. The overcurrent trip level is set by resistor R10 and the stall overload time is set by resistor R8.
GB4713073A 1972-10-11 1973-10-09 Solid state thermal overload indicator Expired GB1452293A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA153,623A CA962331A (en) 1972-10-11 1972-10-11 Solid state thermal overload indicator

Publications (1)

Publication Number Publication Date
GB1452293A true GB1452293A (en) 1976-10-13

Family

ID=4094646

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4713073A Expired GB1452293A (en) 1972-10-11 1973-10-09 Solid state thermal overload indicator

Country Status (5)

Country Link
JP (1) JPS4972644A (en)
CA (1) CA962331A (en)
DE (1) DE2351158A1 (en)
FR (1) FR2203194A1 (en)
GB (1) GB1452293A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1193317A (en) * 1982-05-07 1985-09-10 Canadian General Electric Company Limited Thermal model for electrical apparatus

Also Published As

Publication number Publication date
DE2351158A1 (en) 1974-04-18
CA962331A (en) 1975-02-04
FR2203194A1 (en) 1974-05-10
JPS4972644A (en) 1974-07-13

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees