GB641792A - Improvements in or relating to electric power supply systems - Google Patents
Improvements in or relating to electric power supply systemsInfo
- Publication number
- GB641792A GB641792A GB3727146A GB3727146A GB641792A GB 641792 A GB641792 A GB 641792A GB 3727146 A GB3727146 A GB 3727146A GB 3727146 A GB3727146 A GB 3727146A GB 641792 A GB641792 A GB 641792A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phase
- relays
- voltages
- rectifiers
- resistors
- 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
- H02H3/32—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 corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—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 corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
- H02H3/353—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 corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system involving comparison of phase voltages
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
641,792. Fault testing. STANDARD TELEPHONES & CABLES, Ltd. Dec. 18, 1946, No. 37271. [Class 37] [Also in Group XXXVII] In a phase unbalance indicating device for a delta power supply systems, Fig. 1, the phase conductors 1, 2, 3 are interconnected by resistors R1-6 shunted by condensers C1-6 'and in series with rectifiers RU1-6, so that the rectified voltages appearing across the resistors are proportional to the respective interphase voltages and are equal when the phase voltages are balanced. The rectifiers are poled so that the voltages across each resistor of a pair returned to the same phase have the same polarity, and relays A, B, C are connected respectively across the junctions of such resistor pairs and their associated rectifiers. The relays A, B, C, each have 2 sets of contacts a1, a2, b1, b2, c1, c2, series connected in pairs a1 b2, b1 c2, c1 a2, in an alarm or cut out operative circuit foreach phase, Fig. 2. The relays are inoperative when the phase voltages balance, but voltage deviation of phase 1 for example operates relays A and B leaving relay C in. operative, so that the phase 1 alarm circuit is energized. Similarly, voltage deviations of phase 2 or phase 3 operate relays B, C and A, C respectively. Explanatory vector diagrams are included. In a modification (Fig. 3, not shown), 2 relays only are employed with a 3-phase supply, and in a further modification (Figs. 4, 5, not shown), the device is applied to a 5- phase supply. The invention is also applicable to a star connected system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3727146A GB641792A (en) | 1946-12-18 | 1946-12-18 | Improvements in or relating to electric power supply systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3727146A GB641792A (en) | 1946-12-18 | 1946-12-18 | Improvements in or relating to electric power supply systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB641792A true GB641792A (en) | 1950-08-23 |
Family
ID=10395110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3727146A Expired GB641792A (en) | 1946-12-18 | 1946-12-18 | Improvements in or relating to electric power supply systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB641792A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2232762A1 (en) * | 1973-06-07 | 1975-01-03 | Bbc Brown Boveri & Cie |
-
1946
- 1946-12-18 GB GB3727146A patent/GB641792A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2232762A1 (en) * | 1973-06-07 | 1975-01-03 | Bbc Brown Boveri & Cie |
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