GB1452293A - Solid state thermal overload indicator - Google Patents
Solid state thermal overload indicatorInfo
- 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
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.
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)
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 |
-
1972
- 1972-10-11 CA CA153,623A patent/CA962331A/en not_active Expired
-
1973
- 1973-10-04 JP JP11108373A patent/JPS4972644A/ja active Pending
- 1973-10-09 GB GB4713073A patent/GB1452293A/en not_active Expired
- 1973-10-10 FR FR7336269A patent/FR2203194A1/fr not_active Withdrawn
- 1973-10-11 DE DE19732351158 patent/DE2351158A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE2351158A1 (en) | 1974-04-18 |
JPS4972644A (en) | 1974-07-13 |
CA962331A (en) | 1975-02-04 |
FR2203194A1 (en) | 1974-05-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |