GB391546A - Improvements in and relating to protective devices for electric distribution systems - Google Patents
Improvements in and relating to protective devices for electric distribution systemsInfo
- Publication number
- GB391546A GB391546A GB1273/32A GB127332A GB391546A GB 391546 A GB391546 A GB 391546A GB 1273/32 A GB1273/32 A GB 1273/32A GB 127332 A GB127332 A GB 127332A GB 391546 A GB391546 A GB 391546A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- neutral
- earth
- relay
- frequency generator
- 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
- H02H3/16—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 fault current to earth, frame or mass
- H02H3/17—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 fault current to earth, frame or mass by means of an auxiliary voltage injected into the installation to be protected
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
391,546. Protective cut-out arrangements. INTERNATIONAL GENERAL ELECTRIC CO., Inc., 120, Broadway, New York, U.S.A.-(Assignees of Allgemeine, Elektricitõts-Ges.; 2, Friedrich Karl- Ufer Berlin.) Jan. 15, 1932, No. 1273. Convention date, Jan. 15, 1931. [Class 38 (v).] Earth leakage protection of apparatus for example the generator or transformer 1 is effected by employing a wattmeter relay 4 tuned to a frequency different from the fundamental frequency of the apparatus so as to be particularly sensitive to the frequency superimposed on the apparatus by a frequency generator 7 which, as shown, may be located in the connection from neutral to earth. In this way selective protection against internal earth faults may be obtained without the use of very accurately matched summation transformers 3 which in conjunction with the transformer 5 in the earth. connection supply one coil of the relay the other coil being supplied with a current which is a measure of the voltage of the frequency generator. The resultant current from the transformers 3, 5 may be amplified by means of a thermionic valve and the amplified current supplied to the relay. Where the protected apparatus has an insulated neutral, an artificial neutral may be formed and to this neutral the frequency generator connected. The frequency generator may be brought into use only on fault.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE391546X | 1931-01-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB391546A true GB391546A (en) | 1933-05-04 |
Family
ID=6380484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1273/32A Expired GB391546A (en) | 1931-01-15 | 1932-01-15 | Improvements in and relating to protective devices for electric distribution systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB391546A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3427505A (en) * | 1966-01-25 | 1969-02-11 | Uninorm Anstalt | Leakage current protection switch with excess current release |
| CZ302920B6 (en) * | 2009-01-23 | 2012-01-18 | Západoceská Univerzita V Plzni | Device for compensation of ground currents connected to phase conductors of distribution system |
-
1932
- 1932-01-15 GB GB1273/32A patent/GB391546A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3427505A (en) * | 1966-01-25 | 1969-02-11 | Uninorm Anstalt | Leakage current protection switch with excess current release |
| CZ302920B6 (en) * | 2009-01-23 | 2012-01-18 | Západoceská Univerzita V Plzni | Device for compensation of ground currents connected to phase conductors of distribution system |
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