FR2432211A1 - Cut=out circuit for three=phase transformer protection - has three transformers with resistors and thermistor associated with capacitor and solenoid - Google Patents
Cut=out circuit for three=phase transformer protection - has three transformers with resistors and thermistor associated with capacitor and solenoidInfo
- Publication number
- FR2432211A1 FR2432211A1 FR7822069A FR7822069A FR2432211A1 FR 2432211 A1 FR2432211 A1 FR 2432211A1 FR 7822069 A FR7822069 A FR 7822069A FR 7822069 A FR7822069 A FR 7822069A FR 2432211 A1 FR2432211 A1 FR 2432211A1
- Authority
- FR
- France
- Prior art keywords
- cut
- resistors
- capacitor
- out circuit
- potentiometer
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/004—Thermally-actuated switches with thermal image
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/14—Electrothermal mechanisms
-
- 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
-
- 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
- H02H7/04—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 transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The cut-out circuit is for contactors esp. those providing protection for the low voltage side of polyphase transformers used in electrical power distribution and particularly those employed in rural areas. The cut-out also minimises heating at the contactor proper. Current level and balance in each phase is detected by a current transformer (2, 3, 4) within an insulated housing (1). Each transformer secondary is shunted by a low value resistor (8, 9, 10). The three resistors are spaced symmetrically around a single central heat sensitive element (11). This forms one part of a potentiometer (27, 11) controlling the gate bias of a threshold detecting thyristor or similar semiconductor. The voltage from each resistor also determines the charge on a capacitor (19) via rectifying diodes (13-18) and a further resistive, zener diode potentiometer (20-23) controlling the supply voltage across the thyristor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7822069A FR2432211A1 (en) | 1978-07-24 | 1978-07-24 | Cut=out circuit for three=phase transformer protection - has three transformers with resistors and thermistor associated with capacitor and solenoid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7822069A FR2432211A1 (en) | 1978-07-24 | 1978-07-24 | Cut=out circuit for three=phase transformer protection - has three transformers with resistors and thermistor associated with capacitor and solenoid |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2432211A1 true FR2432211A1 (en) | 1980-02-22 |
FR2432211B3 FR2432211B3 (en) | 1981-02-13 |
Family
ID=9211186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7822069A Granted FR2432211A1 (en) | 1978-07-24 | 1978-07-24 | Cut=out circuit for three=phase transformer protection - has three transformers with resistors and thermistor associated with capacitor and solenoid |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2432211A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2504748A1 (en) * | 1981-04-27 | 1982-10-29 | Westinghouse Electric Corp | SEMICONDUCTOR LOAD PROTECTION DEVICE WITH ELECTRONIC SIMULATION OF THE HEATING OF AN ENGINE |
FR2554271A1 (en) * | 1983-11-02 | 1985-05-03 | Merlin Gerin | Thermal image of an electrical transformer |
FR2702083A1 (en) * | 1993-02-22 | 1994-09-02 | Telemecanique | Electrical protection device with thermal detector. |
-
1978
- 1978-07-24 FR FR7822069A patent/FR2432211A1/en active Granted
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2504748A1 (en) * | 1981-04-27 | 1982-10-29 | Westinghouse Electric Corp | SEMICONDUCTOR LOAD PROTECTION DEVICE WITH ELECTRONIC SIMULATION OF THE HEATING OF AN ENGINE |
FR2554271A1 (en) * | 1983-11-02 | 1985-05-03 | Merlin Gerin | Thermal image of an electrical transformer |
FR2702083A1 (en) * | 1993-02-22 | 1994-09-02 | Telemecanique | Electrical protection device with thermal detector. |
EP0615266A1 (en) * | 1993-02-22 | 1994-09-14 | Schneider Electric Sa | Electric protection device with thermal detector |
Also Published As
Publication number | Publication date |
---|---|
FR2432211B3 (en) | 1981-02-13 |
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