GB1424228A - Earth leakage proteciton circuit - Google Patents
Earth leakage proteciton circuitInfo
- Publication number
- GB1424228A GB1424228A GB1733173A GB1733173A GB1424228A GB 1424228 A GB1424228 A GB 1424228A GB 1733173 A GB1733173 A GB 1733173A GB 1733173 A GB1733173 A GB 1733173A GB 1424228 A GB1424228 A GB 1424228A
- Authority
- GB
- United Kingdom
- Prior art keywords
- secondary winding
- triac
- diodes
- voltage
- thyristor
- 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
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
1424228 Protective arrangements TEXAS INSTRUMENTS Ltd 11 April 1973 17331/73 H2K An earth-leakage protective arrangement for an A.C. mains supply comprises a circuitbreaker BS1, BS2 having a winding BL in series with a semi-conductor trigger device, e.g. a triac S2, across the mains supply, which trigger device may be rendered conductive in response to both positive and negative half cycles of the voltage induced in the secondary winding L3 of a core-balance transformer T when the voltage in this secondary winding exceeds a threshold value. As shown, the ends of the centre tapped secondary winding L3 are connected through diodes D1, D2 to the gate of a thyristor S1. This thyristor S1 connects the gate of the triac S2 to the junction between a diode D3 and a Zener diode Z when rendered conductive on the occurrence of an earth leakage. A capacitor C ensures that a triggering voltage is always available for the triac S2. In a modified arrangement, the diodes D1, D2 are replaced by Zener diodes and capacitors connected across the two halves of the secondary winding and two thyristors are used, Fig. 2 (not shown).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1733173A GB1424228A (en) | 1973-04-11 | 1973-04-11 | Earth leakage proteciton circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1733173A GB1424228A (en) | 1973-04-11 | 1973-04-11 | Earth leakage proteciton circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1424228A true GB1424228A (en) | 1976-02-11 |
Family
ID=10093304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1733173A Expired GB1424228A (en) | 1973-04-11 | 1973-04-11 | Earth leakage proteciton circuit |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1424228A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2131636A (en) * | 1982-10-20 | 1984-06-20 | Technical Components Pty Ltd | Gas flow control circuits |
-
1973
- 1973-04-11 GB GB1733173A patent/GB1424228A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2131636A (en) * | 1982-10-20 | 1984-06-20 | Technical Components Pty Ltd | Gas flow control circuits |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |