GB1152793A - Improvements in and relating to Earth Leakage Protection Devices - Google Patents
Improvements in and relating to Earth Leakage Protection DevicesInfo
- Publication number
- GB1152793A GB1152793A GB11436/67A GB1143667A GB1152793A GB 1152793 A GB1152793 A GB 1152793A GB 11436/67 A GB11436/67 A GB 11436/67A GB 1143667 A GB1143667 A GB 1143667A GB 1152793 A GB1152793 A GB 1152793A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- relay
- supply
- main
- breaker
- 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
- H02H3/33—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 using summation current transformers
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
Abstract
1,152,793. Protective arrangements. FUCHS ELECTRICAL INDUSTRIES (PTY.) Ltd. 10 March, 1967 [11 March, 1966], No. 11436/67. Heading H2K. In an earth leakage protective arrangement in which the signal from a core balance transformer 2 effects the operation of a relay 25, 26 through an amplifier and a trigger device, the " power " supply for the amplifier and device is derived from the main protected A.C. circuit through a capacitor 16 which functions as a voltage dropper. As shown, unbalance between the currents in the single turn primary windings 6, 7 of the transformer induces current in the secondary winding 4 which with a capacitor 9 forms a tuned circuit. The resulting signal is applied to the base of a transistor 10 to render it conductive and the output of the transistor acting through a current limiting resistor 19 triggers a silicon controlled rectifier 20 which conducts to energize the relay coil 25. The " power " supply for this circuit is obtained from the main supply conductors through conductors 14, 15. A shunt trip coil of a main circuit-breaker is connected in series with the line 15 so that when the relay closes its contacts 26 the shunt trip coil is fully energized and trips the circuit-breaker. A test winding 5 on the core-balance transformer is controlled by a switch 41.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA661387 | 1966-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1152793A true GB1152793A (en) | 1969-05-21 |
Family
ID=25560973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB11436/67A Expired GB1152793A (en) | 1966-03-11 | 1967-03-10 | Improvements in and relating to Earth Leakage Protection Devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1152793A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2137591A1 (en) * | 1971-05-07 | 1972-12-29 | Rucker Co | |
| EP0311649A1 (en) * | 1987-01-30 | 1989-04-19 | Square D Co | Add-on ground fault module. |
-
1967
- 1967-03-10 GB GB11436/67A patent/GB1152793A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2137591A1 (en) * | 1971-05-07 | 1972-12-29 | Rucker Co | |
| EP0311649A1 (en) * | 1987-01-30 | 1989-04-19 | Square D Co | Add-on ground fault module. |
| EP0311649A4 (en) * | 1987-01-30 | 1990-09-05 | Square D Company | Add-on ground fault module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |