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 ORGANIZATIONSInfo
- 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
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>
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)
| 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)
| 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 |
-
1980
- 1980-08-04 FR FR8017424A patent/FR2488458A1/en active Granted
-
1981
- 1981-07-28 DE DE19813129730 patent/DE3129730A1/en active Granted
- 1981-08-03 SE SE8104643A patent/SE447685B/en not_active IP Right Cessation
- 1981-08-03 BE BE0/205565A patent/BE889836A/en not_active IP Right Cessation
- 1981-08-03 NL NL8103660A patent/NL8103660A/en not_active Application Discontinuation
- 1981-08-03 NO NO812629A patent/NO159470C/en unknown
- 1981-08-03 AT AT0341381A patent/AT389961B/en not_active IP Right Cessation
- 1981-08-03 IT IT23345/81A patent/IT1137790B/en active
- 1981-08-03 CH CH499781A patent/CH642199A5/en not_active IP Right Cessation
- 1981-08-03 ES ES504510A patent/ES8207661A1/en not_active Expired
- 1981-08-04 GB GB8123751A patent/GB2081995B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2488458B1 (en) | 1984-05-18 |
| ES504510A0 (en) | 1982-09-16 |
| NO159470B (en) | 1988-09-19 |
| IT1137790B (en) | 1986-09-10 |
| SE447685B (en) | 1986-12-01 |
| GB2081995A (en) | 1982-02-24 |
| GB2081995B (en) | 1985-01-09 |
| IT8123345A0 (en) | 1981-08-03 |
| FR2488458A1 (en) | 1982-02-12 |
| ATA341381A (en) | 1989-07-15 |
| NO812629L (en) | 1982-02-05 |
| DE3129730A1 (en) | 1982-02-25 |
| CH642199A5 (en) | 1984-03-30 |
| NO159470C (en) | 1989-01-04 |
| BE889836A (en) | 1981-12-01 |
| AT389961B (en) | 1990-02-26 |
| DE3129730C2 (en) | 1990-05-31 |
| ES8207661A1 (en) | 1982-09-16 |
| NL8103660A (en) | 1982-03-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NUG | Patent has lapsed |
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