GB573172A - Improvements in or relating to arrangements of differential electric protection - Google Patents
Improvements in or relating to arrangements of differential electric protectionInfo
- Publication number
- GB573172A GB573172A GB9977/40A GB997740A GB573172A GB 573172 A GB573172 A GB 573172A GB 9977/40 A GB9977/40 A GB 9977/40A GB 997740 A GB997740 A GB 997740A GB 573172 A GB573172 A GB 573172A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transformers
- saturable
- line
- lines
- secondaries
- 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
- H02H7/267—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 for parallel lines and wires
-
- 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
- H02H3/28—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 two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Transformers (AREA)
Abstract
573,172. Protective cut-out arrangements. COMPAGNIE POUR LA FABRICATION DES COMPTEURS ET MATERIEL D'USINES A GAS. June 7, 1940, No. 9977. Convention date, June 13, 1939. [Class 38 (v)] Differential protective systems of the circulating-current or opposed voltage type, for line-sections or machines, and employing saturable transformers for limiting the throughfault current, are prevented from operation by differences, due to such saturation, in wave-form of the secondary currents delivered to the pilot circuit, by non-saturable chokes in the secondary circuits, which chokes have for effect the avoidance of " peaked " waves. The transformers may be the line currenttransformers or, as shown, auxiliary transformers with unequal secondaries to give protection also against interphase faults, and are saturable. Applications to simple circuits and to an alternator are described, Figs. 3-5 (not shown), also to the disconnection of all of three lines connected to a busbar set, Fig. 6 (not shown), but in Fig. 7 selective disconnection of any of three lines 1, 1a, 1b connected to common bars can be obtained. Currenttransformer groups 2, 2a, 2b in the lines are each connected to auxiliary saturable transformers 6, 6a, 6b, the secondaries of which are connected in series with non-saturable chokes 7, 7a, 7b across resistances 5, 5a, 5b connected in star on one side. The relays 4, 4a, 4b are mesh-connected to the free ends of the resistances and provided with two sets of contacts, connected to the starting coils of circuit-breakers 15 in the lines. If a fault occurs in, say, line 1, the potential of the free end of the resistance 5 changes with respect to that of the other free ends, relays 4, 4b operate, and trip out the faulty line. The line 1, Fig. 8 has interposed in the pilot circuit 27, which may be subjected to high induced voltages, a pair of insulating transformers 26, the mid points of the secondaries of which are earthed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR573172X | 1939-06-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB573172A true GB573172A (en) | 1945-11-09 |
Family
ID=8951766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9977/40A Expired GB573172A (en) | 1939-06-13 | 1940-06-07 | Improvements in or relating to arrangements of differential electric protection |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB573172A (en) |
-
1940
- 1940-06-07 GB GB9977/40A patent/GB573172A/en not_active Expired
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