GB610837A - Improvements in devices for selective electric protection - Google Patents
Improvements in devices for selective electric protectionInfo
- Publication number
- GB610837A GB610837A GB33701/45A GB3370145A GB610837A GB 610837 A GB610837 A GB 610837A GB 33701/45 A GB33701/45 A GB 33701/45A GB 3370145 A GB3370145 A GB 3370145A GB 610837 A GB610837 A GB 610837A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- voltage
- rectifiers
- potentiometer
- bias
- 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
- H02H3/26—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
- H02H3/353—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system involving comparison of phase voltages
-
- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Landscapes
- Protection Of Static Devices (AREA)
Abstract
610,837. Protective cut-out systems. COMPAGNIE ELECTRO-MECANIQUE. Dec. 12, 1945, No. 33701. Convention date, June 30, 1943. [Class 38 (v)] In a three-phase protective arrangement wherein only the switch in a faulty phase is actuated, the rectified alternating voltages between each phase and earth (represented in the Figures by batteries e1 ... e3) are connected in series with rectifiers R1 .. : R3, in parallel with a potentiometer PA partly shunted by a condenser CA. If one phase fails, the others feed it in the reverse direction, thereby creating a voltage across the appropriate rectifier, this voltage being used to operate the release mechanism. If two phases fail, voltages appear across the two rectifiers, and if all three fail, the condenser CA feeds all three, thereby setting up a voltage across each rectifier. In Fig. 2, a point ED on the potentiometer PA is connected by rectifiers R<1>1 ... R<1>3 to the grids of gas tubes L1 ... L3 controlling the release valves V1 ... V3. A battery Eo provides a bias against operation of the tubes L1 ... L3 and is normally assisted by the potentiometer volt-drop eD. If a fault occurs, say in phase 3, voltage e3 drops and current from the other sources e1, e2 flows from ED via R<1>3 to the grid of tube L3, so avoiding the bias eD, but the bias eo is only wiped out, to produce tripping, on internal fault, when a directional control impulse is received via the transformer T.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR55663T | 1943-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB610837A true GB610837A (en) | 1948-10-21 |
Family
ID=8689967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB33701/45A Expired GB610837A (en) | 1943-06-30 | 1945-12-12 | Improvements in devices for selective electric protection |
Country Status (2)
| Country | Link |
|---|---|
| FR (2) | FR972827A (en) |
| GB (1) | GB610837A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4021703A (en) * | 1975-06-02 | 1977-05-03 | Westinghouse Electric Corporation | Phase imbalance detection circuit |
-
1941
- 1941-05-09 FR FR972827D patent/FR972827A/en not_active Expired
-
1943
- 1943-06-30 FR FR55663D patent/FR55663E/en not_active Expired
-
1945
- 1945-12-12 GB GB33701/45A patent/GB610837A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR972827A (en) | 1951-02-05 |
| FR55663E (en) | 1952-09-03 |
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