GB849657A - Improvements in and relating to electrical protective relay systems - Google Patents
Improvements in and relating to electrical protective relay systemsInfo
- Publication number
- GB849657A GB849657A GB127956A GB127956A GB849657A GB 849657 A GB849657 A GB 849657A GB 127956 A GB127956 A GB 127956A GB 127956 A GB127956 A GB 127956A GB 849657 A GB849657 A GB 849657A
- Authority
- GB
- United Kingdom
- Prior art keywords
- unit
- transductors
- current transformer
- protective relay
- energized
- 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
- H02H3/40—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 ratio of voltage and current
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
849,657. Protective cut-out arrangements. ENGLISH ELECTRIC CO. Ltd. Jan. 11, 1957 [Jan. 13, 1956], No. 1279/56. Class 38 (5). A protective relay system comprises two transductors having their control-windings 20b energized by different control currents which are dependent on different electrical conditions and are both derived from the voltage and the current of a protected A.C. circuit, a relayoperating means 24 being operated only when both transductors are saturated. The main or operating windings 20a of the transductors may be energized from a separate source having a frequency appreciably greater than the main supply frequency, or directly from a current transformer, or from the current transformer 22 by means of a saturating current transformer or a transactor 23, as shown. The control currents may be derived from a directional unit and an impedance unit as shown, or from a mho unit and a reactance unit, Fig. 3 (not shown). Reference is also made to the use of a magnetic amplifier or a transistor amplifier as an input stage to the means 24.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB127956A GB849657A (en) | 1956-01-13 | 1956-01-13 | Improvements in and relating to electrical protective relay systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB127956A GB849657A (en) | 1956-01-13 | 1956-01-13 | Improvements in and relating to electrical protective relay systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB849657A true GB849657A (en) | 1960-09-28 |
Family
ID=9719205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB127956A Expired GB849657A (en) | 1956-01-13 | 1956-01-13 | Improvements in and relating to electrical protective relay systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB849657A (en) |
-
1956
- 1956-01-13 GB GB127956A patent/GB849657A/en not_active Expired
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