GB688594A - Improvements in selective electric protection systems - Google Patents
Improvements in selective electric protection systemsInfo
- Publication number
- GB688594A GB688594A GB9203/51A GB920351A GB688594A GB 688594 A GB688594 A GB 688594A GB 9203/51 A GB9203/51 A GB 9203/51A GB 920351 A GB920351 A GB 920351A GB 688594 A GB688594 A GB 688594A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- circuit
- relays
- energized
- operate
- 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
- 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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
688,594. Protective cut-out arrangements. ELECTRICITE DE FRANCE. April 19, 1951 [Aug. 29, 1950], No. 9203/51. Class 38 (v) A selective protection arrangement has a directional relay a, a<SP>1</SP>, preferably of the wattmetric type, at each end A, B of the protected line L, the relays controlling the energization of tripping relays b, b<SP>1</SP> by means of an alternating current pilot circuit having transformers T1, T2. In the arrangement shown, should a fault occur outside the protected section at X, the relay a closes, but relay a<SP>1</SP> remains open, so that the relay b<SP>I</SP> cannot be energized. The nilot circuit P is energized from the a.c. source S, but the impedance of the circuit including the relay b, the transformers T1, T2 and the pilots P is such that the current flowing is insufficient to operate relay b. If a fault occurs outside the protected section at Z, relay a does not operate, so that the pilot system remains de-energized and the relays b, b<SP>1</SP> are not operated. Should a fault occur within the protected section at Y, both relays a, a<SP>1</SP> close and since the secondary circuit C<SP>1</SP> of the transformer T2 is now complete, the impedance of the pilot system-is low enough for relay b to operate. Relay b<SP>1</SP> also operates and the circuit-breakers D, D<SP>1</SP> at each end of the protected section L are tripped:
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR688594X | 1950-08-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB688594A true GB688594A (en) | 1953-03-11 |
Family
ID=9026813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9203/51A Expired GB688594A (en) | 1950-08-29 | 1951-04-19 | Improvements in selective electric protection systems |
Country Status (2)
Country | Link |
---|---|
BE (1) | BE502704A (en) |
GB (1) | GB688594A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3148309A (en) * | 1960-08-23 | 1964-09-08 | John H Neher | Pilot wire protective system for transmission lines |
-
0
- BE BE502704D patent/BE502704A/xx unknown
-
1951
- 1951-04-19 GB GB9203/51A patent/GB688594A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3148309A (en) * | 1960-08-23 | 1964-09-08 | John H Neher | Pilot wire protective system for transmission lines |
Also Published As
Publication number | Publication date |
---|---|
BE502704A (en) |
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