GB937205A - Improvements relating to impedance protective systems - Google Patents
Improvements relating to impedance protective systemsInfo
- Publication number
- GB937205A GB937205A GB3676559A GB3676559A GB937205A GB 937205 A GB937205 A GB 937205A GB 3676559 A GB3676559 A GB 3676559A GB 3676559 A GB3676559 A GB 3676559A GB 937205 A GB937205 A GB 937205A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- circuit
- comparison
- proportional
- protected
- 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
- Protection Of Transformers (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
937,205. Protective systems. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Oct. 13, 1960 [Oct. 29, 1959], No. 36769/59. Class 38 (5). A distance protective arrangement comprises a voltage transformer 4 for producing a first voltage proportional to the voltage of the protected circuit 1, a capacitor-resistor network 8, 9 for modifying the first voltage by eliminating from it the component proportional to the RI component of the circuit voltage, a linear mutual inductor 6 having a non-ferro-magnetic core and providing a second voltage proportional to the rate of change of the circuit current, a comparison circuit 3 for comparing the modified first voltage with the vector difference of the modified first voltage and the second voltage, and a protective device 5 energized from the comparison circuit to disconnect the protected circuit when the comparison indicates a fault in the protected circuit. The comparison circuit includes transistor coincidence circuits which effect phase comparison for both the negative and positive half-cycles of the input voltages and energize a relay 5<SP>1</SP> controlling a trip coil 5 only when the input voltages applied to the comparison circuit over two successive half-cycles indicate that a fault exists on the protected circuit. Specification 925,014 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3676559A GB937205A (en) | 1959-10-29 | 1959-10-29 | Improvements relating to impedance protective systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3676559A GB937205A (en) | 1959-10-29 | 1959-10-29 | Improvements relating to impedance protective systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB937205A true GB937205A (en) | 1963-09-18 |
Family
ID=10391017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3676559A Expired GB937205A (en) | 1959-10-29 | 1959-10-29 | Improvements relating to impedance protective systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB937205A (en) |
-
1959
- 1959-10-29 GB GB3676559A patent/GB937205A/en not_active Expired
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