SE8104643L - CIRCUIT FOR OVERHEAT PROTECTION BY AN ELECTRIC ENGINE INCLUDING TWO TIME CONSTANT ORGANIZATIONS - Google Patents

CIRCUIT FOR OVERHEAT PROTECTION BY AN ELECTRIC ENGINE INCLUDING TWO TIME CONSTANT ORGANIZATIONS

Info

Publication number
SE8104643L
SE8104643L SE8104643A SE8104643A SE8104643L SE 8104643 L SE8104643 L SE 8104643L SE 8104643 A SE8104643 A SE 8104643A SE 8104643 A SE8104643 A SE 8104643A SE 8104643 L SE8104643 L SE 8104643L
Authority
SE
Sweden
Prior art keywords
time constant
voltage
motor
capacitor
reference voltage
Prior art date
Application number
SE8104643A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE447685B (en
Inventor
C Cadet
G Baurand
B Dumortier
G Souques
Original Assignee
Telemecanique Electrique
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 Telemecanique Electrique filed Critical Telemecanique Electrique
Publication of SE8104643L publication Critical patent/SE8104643L/en
Publication of SE447685B publication Critical patent/SE447685B/en

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
    • 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)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

Overload protection for an electric motor is provided by two RC temperature-simulating networks each charged from a voltage representing the square of the motor current and each comprising a resistor 1301, 1700, a switch 16, 17 controlled by recurrent pulses, and a capacitor 24, 25. The voltage across each capacitor 24, 25 is compared (29, 30) with a respective reference voltage in order to detect overload. The time constant of the second network 1700, 17, 25 represents the conventional cooling of the motor, indicated by the manufacturer. The time constant of the first network corresponds to the cold starting time for a current equal to six times the nominal current. The second reference voltage corresponds to a overload of a few percent and the first reference voltage is greater than this. A cross-coupling network 27, 2701, 2702 prevents the voltage across the first capacitor 24 falling below that across the second (25). The pulses supplied to switch 17 are varied depending on whether the motor is being energised or not. <IMAGE>
SE8104643A 1980-08-04 1981-08-03 DEVICE FOR HEATING PROTECTION OF AN ELECTRIC ENGINE SE447685B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8017424A FR2488458A1 (en) 1980-08-04 1980-08-04 THERMAL PROTECTION CIRCUIT OF AN ELECTRIC MOTOR COMPRISING TWO TIME-CONSTANT ORGANS

Publications (2)

Publication Number Publication Date
SE8104643L true SE8104643L (en) 1982-02-05
SE447685B SE447685B (en) 1986-12-01

Family

ID=9244980

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8104643A SE447685B (en) 1980-08-04 1981-08-03 DEVICE FOR HEATING PROTECTION OF AN ELECTRIC ENGINE

Country Status (11)

Country Link
AT (1) AT389961B (en)
BE (1) BE889836A (en)
CH (1) CH642199A5 (en)
DE (1) DE3129730A1 (en)
ES (1) ES8207661A1 (en)
FR (1) FR2488458A1 (en)
GB (1) GB2081995B (en)
IT (1) IT1137790B (en)
NL (1) NL8103660A (en)
NO (1) NO159470C (en)
SE (1) SE447685B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4819118A (en) * 1988-06-02 1989-04-04 Westinghouse Electric Corp. Electromagnetic contactor tandem control system for thermal protection of a bidirectional motor drive

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH534444A (en) * 1972-05-23 1973-02-28 Sprecher & Schuh Ag Electronic motor protection relay with current-dependent tripping
CH540587A (en) * 1972-08-22 1973-08-15 Sprecher & Schuh Ag Circuit arrangement that represents a thermal image of electrical equipment that is dependent on electrical losses
DE2600472C3 (en) * 1976-01-08 1981-12-10 Siemens AG, 1000 Berlin und 8000 München Overload protection device for an electrical machine
DE2939938C2 (en) * 1979-09-28 1984-05-30 Siemens AG, 1000 Berlin und 8000 München Overload protection arrangement for an electrical machine
FR2468238A1 (en) * 1979-10-16 1981-04-30 Telemecanique Electrique Phase loss or overvoltage protector for motor - has signal fed to comparator via Zener network and driving cut=off relay in motor supply

Also Published As

Publication number Publication date
DE3129730A1 (en) 1982-02-25
DE3129730C2 (en) 1990-05-31
AT389961B (en) 1990-02-26
GB2081995A (en) 1982-02-24
FR2488458A1 (en) 1982-02-12
NO812629L (en) 1982-02-05
ATA341381A (en) 1989-07-15
CH642199A5 (en) 1984-03-30
FR2488458B1 (en) 1984-05-18
SE447685B (en) 1986-12-01
IT8123345A0 (en) 1981-08-03
ES504510A0 (en) 1982-09-16
NL8103660A (en) 1982-03-01
IT1137790B (en) 1986-09-10
NO159470B (en) 1988-09-19
GB2081995B (en) 1985-01-09
ES8207661A1 (en) 1982-09-16
NO159470C (en) 1989-01-04
BE889836A (en) 1981-12-01

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