GB883349A - Improvements relating to protective circuit arrangements - Google Patents
Improvements relating to protective circuit arrangementsInfo
- Publication number
- GB883349A GB883349A GB389859A GB389859A GB883349A GB 883349 A GB883349 A GB 883349A GB 389859 A GB389859 A GB 389859A GB 389859 A GB389859 A GB 389859A GB 883349 A GB883349 A GB 883349A
- Authority
- GB
- United Kingdom
- Prior art keywords
- load
- current
- paths
- circuit
- protective circuit
- 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
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
883,349. Protective arrangements. WESTINGHOUSE BRAKE & SIGNAL CO. Ltd. Feb. 4, 1960 [Feb. 4, 1959], No. 3898/59. Class 38 (4). [Also in Group XXXVII] A protective circuit comprises two parallel oppositely poled conductivity-controlled semiconductor circuit paths, each path having a blocking characteristic in the reverse direction and a breakover voltage for conduction in the forward direction, control means for applying triggering signals to render the paths conducting, and current-responsive means to inhibit the application of the triggering signals when the current taken by a protected load exceeds a predetermined overload value. In Fig. 1 the parallel paths are provided by rectifier 9, 99 and semi-conductor diodes 5, 55 each of which conducts in the forward direction of the associated rectifier when triggering pulses are applied by an associated pulse generator 4 or 44 under the control of a flip-flop device 6. Under normal conditions the paths conduct on their appropriate half-cycles so that A.C. is supplied from a source 1 to a load 2. When the current to the load 2 exceeds the predetermined value, a current-sensing device 7 supplies a signal to the device 6 which then acts to cut-off the pulse generation so that the supply to the load is interrupted. Restoration of the supply to the load 2 may be effected by manual control of the device 6. In an alternative arrangement, Fig. 2 (not shown), the protective circuit is connected in parallel with the load and is normally non-conducting. When the predetermined load current value is exceeded, the protective circuit is rendered conducting and places a short-circuit across the load to cause the tripping of a highspeed circuit-breaker. In either embodiment the rectifier-semi-conductor combination in each path may be replaced by a three-electrode semi-conductor device which has a permanent blocking characteristic in-the reverse direction and a breakover voltage in the forward direction controllable in dependence on the voltage applied to a control electrode, Figs. 3 and 4 (not shown).
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB389859A GB883349A (en) | 1959-02-04 | 1959-02-04 | Improvements relating to protective circuit arrangements |
| FR816680A FR1246043A (en) | 1959-02-04 | 1960-01-26 | Overload protection circuit |
| BE587004A BE587004A (en) | 1959-02-04 | 1960-01-27 | Overload protection circuit. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB389859A GB883349A (en) | 1959-02-04 | 1959-02-04 | Improvements relating to protective circuit arrangements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB883349A true GB883349A (en) | 1961-11-29 |
Family
ID=9766942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB389859A Expired GB883349A (en) | 1959-02-04 | 1959-02-04 | Improvements relating to protective circuit arrangements |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE587004A (en) |
| FR (1) | FR1246043A (en) |
| GB (1) | GB883349A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3247447A (en) * | 1962-10-23 | 1966-04-19 | Gen Electric | Fast action current limiting protective circuit for phase shift control devices |
-
1959
- 1959-02-04 GB GB389859A patent/GB883349A/en not_active Expired
-
1960
- 1960-01-26 FR FR816680A patent/FR1246043A/en not_active Expired
- 1960-01-27 BE BE587004A patent/BE587004A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3247447A (en) * | 1962-10-23 | 1966-04-19 | Gen Electric | Fast action current limiting protective circuit for phase shift control devices |
Also Published As
| Publication number | Publication date |
|---|---|
| BE587004A (en) | 1960-05-16 |
| FR1246043A (en) | 1960-11-10 |
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