GB705398A - Improvements in or relating to electric signalling arrangements for protective or other purposes - Google Patents
Improvements in or relating to electric signalling arrangements for protective or other purposesInfo
- Publication number
- GB705398A GB705398A GB8191/51A GB819151A GB705398A GB 705398 A GB705398 A GB 705398A GB 8191/51 A GB8191/51 A GB 8191/51A GB 819151 A GB819151 A GB 819151A GB 705398 A GB705398 A GB 705398A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- rectifier
- winding
- current
- pilot
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/10—Control of transmission; Equalising by pilot signal
- H04B3/11—Control of transmission; Equalising by pilot signal using pilot wire
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
- H02H1/0084—Details of emergency protective circuit arrangements concerning transmission of signals by means of pilot wires or a telephone network; watching of these wires
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
705,398. Protective cut-out arrangements. REYROLLE & CO., Ltd., A. March 27, 1952 [April 9, 1951], No. 8191/51. Class 38(5) A two-way signalling circuit, particularly a pilot circuit for a protective arrangement in which the currents at the ends of a protected section are compared, comprises a single pair of pilot wires D, D<SP>1</SP>, a source of A.C. A, A<SP>1</SP> and a rectifier B, Bl at each end in series with the pilot circuit, the rectifiers permitting unidirectional current to circulate in the pilot circuit, and a shunt circuit at each end having a rectifier C, C<SP>1</SP>; opposed to the adjacent series rectifier B, B<SP>1</SP> so that current from the remote and not the adjacent source can flow through a shunt circuit. If the currents at each end are in phase with one another, then current will flow during one half cycle from the source A through the rectifier B, the pilot wires and the remote shunt circuit C<SP>1</SP>, E<SP>1</SP> and energize the " receiver " E<SP>1</SP>. This current does not flow through rectifier B<SP>1</SP> and source A<SP>1</SP> as it is opposed by the source A<SP>1</SP>. During the other half cycle the " receiver " E is similarly energized from the source A<SP>1</SP>. If the currents at each end are in phase opposition, current flows during one half cycle from both sources round the pilot circuit but not through either shunt. circuit as the resultant voltage across each shunt, circuit is in the reverse direction for conduction through the rectifier C, C<SP>1</SP>. On the other half cycle, the rectifiers B, B<SP>1</SP> prevent the flow of current in the pilot circuit so that the receivers E, El remain de-energized. In Fig. 2, this pilot circuit is used to protect a feeder H<SP>1</SP> ... H<SP>3</SP> . and is supplied by summation transformers G. F, G<SP>1</SP>, F<SP>1</SP>. Connected in each shunt circuit is the biasing winding M, M<SP>1</SP> of a relay having an operating winding L, L<SP>1</SP> energized by a tertiary N, N<SP>1</SP> of the adjacent summation transformer. To provide a continuous secondary load for the transformers, a rectifier P, P<SP>1</SP> and a resistance O, O<SP>1</SP> are connected across a portion of the secondary winding F, F<SP>1</SP> of each summation transformer to provide a load circuit in which current flows during the half cycles in which the transformer is not supplying the pilot circuit. Non-linear resistors Q, Q<SP>1</SP> limit the voltage applied to the pilot circuit.. Under through fault conditions, the current in the secondary windings F, F<SP>1</SP> are in phase and the biasing windings M, M<SP>1</SP> are energized as described above to restrain the relays from operaton. In the event of an internal fault, the current in F, Fl are substantially in phase opposition, the windings M, M<SP>1</SP> are not energized and the relay windings L, Ll operate the relay to trip circuit breakers K, K<SP>1</SP>. In a modification, Fig. 3 (not shown), each winding M, M<SP>1</SP> is arranged as the D.C. biasing winding of a transductor, each transductor having an operating winding connected across the secondary winding F, F<SP>1</SP> and a secondary winding supplying a sensitive D.C. relay through a full-wave rectifier. Each transductor may have a short circuited smoothing winding and each smoothing winding may have a rectifier in circuit with it to make the output of the transductor dependent on the phase relationship between the operating and biasing currents.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB300398X | 1951-04-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB705398A true GB705398A (en) | 1954-03-10 |
Family
ID=10301290
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8191/51A Expired GB705398A (en) | 1951-04-09 | 1951-04-09 | Improvements in or relating to electric signalling arrangements for protective or other purposes |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH300398A (en) |
DE (1) | DE935114C (en) |
GB (1) | GB705398A (en) |
-
1951
- 1951-04-09 GB GB8191/51A patent/GB705398A/en not_active Expired
-
1952
- 1952-04-08 CH CH300398D patent/CH300398A/en unknown
- 1952-04-09 DE DER8777A patent/DE935114C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE935114C (en) | 1955-11-10 |
CH300398A (en) | 1954-07-31 |
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