GB1452611A - Solid state thermal overload indicator - Google Patents

Solid state thermal overload indicator

Info

Publication number
GB1452611A
GB1452611A GB4757573A GB4757573A GB1452611A GB 1452611 A GB1452611 A GB 1452611A GB 4757573 A GB4757573 A GB 4757573A GB 4757573 A GB4757573 A GB 4757573A GB 1452611 A GB1452611 A GB 1452611A
Authority
GB
United Kingdom
Prior art keywords
resistor
circuit
capacitors
representative
motor
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
GB4757573A
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 GB1452611A publication Critical patent/GB1452611A/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)
  • Control Of Electric Motors In General (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

1452611 Thermal analogue electric protection CANADIAN GENERAL ELECTRIC CO Ltd 11 Oct 1973 [11 Oct 1972] 47575/73 Heading H2K A thermal analogue protective arrangement for apparatus such as a motor or transformer load 10 has resistor capacitor circuit R10, C2 representative of the thermal characteristics of the conductors and magnetic components of the apparatus and a further resistor capacitor circuit R11, C3 representative of the thermal characteristics of the other components (e.g. insulation) of the apparatus arranged so that the first circuit is fed from sensing means T1, T2, T3, D1, D2, D3, Z1, C1, R1 via transistor Q1 to provide a signal representative of the load circuit currents some of which is bled through a resistor R12 to the further circuit R11, C3 to add to the constant D.C. provided across busbars 13, 14. When the voltage on capacitor C2 reaches a voltage preset by resistor R13 it will switch on amplifier 15 to activate a coil 18 controlling a main circuit breaker 11. Capacitors C2 and C3 have series electronic switches which are controlled by an adjustable oscillator 20 to set the charging times of the capacitors. Resistors R5 to R7 with diodes D4 to D6 control operation on motor stalling at a value set by R7. An oscillator controller 21 may be added to control an electronic switch 19 when the load is switched off and thus to change the signal from the oscillator 20 in such a way that the discharge times of the capacitors C2, C3 are related to the cooling characteristics of the motor and the resetting of the amplifier 15 which is determined by feedback resistor 22 occurs at a safe temperature.
GB4757573A 1972-10-11 1973-10-11 Solid state thermal overload indicator Expired GB1452611A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA153,624A CA962332A (en) 1972-10-11 1972-10-11 Solid state thermal overload indicator

Publications (1)

Publication Number Publication Date
GB1452611A true GB1452611A (en) 1976-10-13

Family

ID=4094647

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4757573A Expired GB1452611A (en) 1972-10-11 1973-10-11 Solid state thermal overload indicator

Country Status (5)

Country Link
JP (1) JPS4976052A (en)
CA (1) CA962332A (en)
DE (1) DE2351157A1 (en)
FR (1) FR2203195A1 (en)
GB (1) GB1452611A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2967332D1 (en) * 1978-07-10 1985-01-31 Cutler Hammer World Trade Inc A.c. power overload protection control
FR2476923A1 (en) * 1979-12-07 1981-08-28 Telemecanique Electrique Exponential heating and cooling function generator - has capacitor with variable pulse width switched resistor to extend effective time constant
SU1046826A1 (en) * 1981-05-06 1983-10-07 Павлодарский Индустриальный Институт Threee-phase electric machine
CA1193316A (en) * 1982-05-07 1985-09-10 David R. Boothman Motor protection apparatus
CA1193317A (en) * 1982-05-07 1985-09-10 Canadian General Electric Company Limited Thermal model for electrical apparatus
JP6707054B2 (en) 2017-04-06 2020-06-10 株式会社デンソーテン Overcurrent protection device and vehicle electronic control unit

Also Published As

Publication number Publication date
CA962332A (en) 1975-02-04
FR2203195A1 (en) 1974-05-10
DE2351157A1 (en) 1974-04-18
JPS4976052A (en) 1974-07-23

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees
728C Application made for restoration (sect. 28/1977)
728R Application refused (sect. 28/1977)