GB574974A - Improvements in direct current networks protecting devices - Google Patents
Improvements in direct current networks protecting devicesInfo
- Publication number
- GB574974A GB574974A GB3756/41A GB375641A GB574974A GB 574974 A GB574974 A GB 574974A GB 3756/41 A GB3756/41 A GB 3756/41A GB 375641 A GB375641 A GB 375641A GB 574974 A GB574974 A GB 574974A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- air
- circuit
- direct current
- inductance
- 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
- H02H3/44—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 the rate of change of electrical quantities
- H02H3/445—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 the rate of change of electrical quantities of DC quantities
Landscapes
- Protection Of Transformers (AREA)
Abstract
574,974. Protective cut-out arrangements. COMPAGNIE POUR LA FABRICATION DES COMPTEURS ET MATERIEL D'USINES A GAZ. March 19, 1941, No. 3756. Convention date, July 28, 1939. [Class 38 (v)] A protective arrangement for a D.C. circuit, such as a traction circuit, comprises a transformer 2 with one or more air-gaps 3, 3<1> and a secondary 4 which feeds a relay 5, preferably of the moving- frame and fixed magnet type, through an inductance 6 of the air-core type, or one having an adjustable air-gap. In order to discriminate between faults and heavy starting-currents, which may reach the value of a fault but in a longer period of time, the relay is made to depend both on the current-maximum and on the rapidity of its establishment, this being effected by making the relay-circuit inductance very high with respect to its resistance, the latter quantity being also adjustable so as to vary its time-constant.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR218207X | 1939-07-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB574974A true GB574974A (en) | 1946-01-29 |
Family
ID=8881379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3756/41A Expired GB574974A (en) | 1939-07-28 | 1941-03-19 | Improvements in direct current networks protecting devices |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH218207A (en) |
| GB (1) | GB574974A (en) |
-
1940
- 1940-12-31 CH CH218207D patent/CH218207A/en unknown
-
1941
- 1941-03-19 GB GB3756/41A patent/GB574974A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH218207A (en) | 1941-11-30 |
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