GB236656A - Improvements in or relating to protective arrangements for alternating current systems - Google Patents
Improvements in or relating to protective arrangements for alternating current systemsInfo
- Publication number
- GB236656A GB236656A GB915424A GB915424A GB236656A GB 236656 A GB236656 A GB 236656A GB 915424 A GB915424 A GB 915424A GB 915424 A GB915424 A GB 915424A GB 236656 A GB236656 A GB 236656A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relays
- fuses
- fault
- balance
- short
- 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
- H02H3/28—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
- H02H3/30—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 using pilot wires or other signalling channel
- H02H3/305—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 using pilot wires or other signalling channel involving current comparison
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Synchronous Machinery (AREA)
Abstract
236,656. British Thomson-Houston Co., Ltd., and Fitzgerald, A. S. April 10, 1924. Cut-out arrangements of the Merz-Price type employing protective' relays 16 connected in star between equipotential points 14 of the normallybalanced pilot-wire system 15 have each of the relays short-circuited by fuses 18 which constitute a delta-connection around the relays. By these means the sensitive relays are rendered insensitive to out of balance currents in the protected lines not due to a fault therein, whereas in the case of an earth fault an out of balance current circulates through the particular relay corresponding to the faulty line and through the neutral point 17, which is connected by the lead 13 to the neutral points of the current transformers 11, 11<1>, unaffected by the shunt fuses. In the case of an interphase fault a relatively large out-of-balance current will circulate through one or more of the fuses which will blow, thereby opening the short-circuit between two of the relays and permitting one or both of them to operate and isolate the section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB915424A GB236656A (en) | 1924-04-10 | 1924-04-10 | Improvements in or relating to protective arrangements for alternating current systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB915424A GB236656A (en) | 1924-04-10 | 1924-04-10 | Improvements in or relating to protective arrangements for alternating current systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB236656A true GB236656A (en) | 1925-07-10 |
Family
ID=9866422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB915424A Expired GB236656A (en) | 1924-04-10 | 1924-04-10 | Improvements in or relating to protective arrangements for alternating current systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB236656A (en) |
-
1924
- 1924-04-10 GB GB915424A patent/GB236656A/en not_active Expired
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