GB1515563A - Earth leakage and overcurrent protection circuit - Google Patents
Earth leakage and overcurrent protection circuitInfo
- Publication number
- GB1515563A GB1515563A GB2166875A GB2166875A GB1515563A GB 1515563 A GB1515563 A GB 1515563A GB 2166875 A GB2166875 A GB 2166875A GB 2166875 A GB2166875 A GB 2166875A GB 1515563 A GB1515563 A GB 1515563A
- Authority
- GB
- United Kingdom
- Prior art keywords
- overcurrent protection
- circuit
- earth leakage
- circuit breaker
- transformer
- 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
- 230000000994 depressogenic effect Effects 0.000 abstract 1
- 239000004065 semiconductor Substances 0.000 abstract 1
- 230000001960 triggered effect Effects 0.000 abstract 1
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
- H02H3/08—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 excess current
- H02H3/10—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 excess current additionally responsive to some other abnormal electrical conditions
- H02H3/105—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 excess current additionally responsive to some other abnormal electrical conditions responsive to excess current and fault current to earth
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Breakers (AREA)
Abstract
1515563 Earth-leakage and overcurrent protection TEXAS INSTRUMENTS Ltd 20 May 1975 21668/75 Addition to 1424228 Heading H2K A circuit providing both earth leakage and overcurrent protection for a mains supply 1, 2 comprises a semiconductor switch 54 which actuates a circuit breaker BL when the secondary of either a current transformer T2 in one of the supply leads or a core-balance transformer T1 delivers a signal above a respective threshold. The earth leakage protection arrangement is generally similar to that described in Specification 1,424,228 except that the circuit breaker preferably has normally-open contacts BS1, BS3 and has its coil connected in parallel with the triac S4, to be de-energized on occurrence of a fault. The circuit breaker will thus also trip if the mains supply fails. The overcurrent protection is provided by an additional SCR S3 connected in the gating circuit of the triac S4 and triggered by an overcurrent signal from transformer T2. Auxiliary contacts BS2, BS4 are automatically held open whilst a resetting button is being depressed to reset the main contacts BS1, BS3 to prevent attempts to override the circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2166875A GB1515563A (en) | 1975-05-20 | 1975-05-20 | Earth leakage and overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2166875A GB1515563A (en) | 1975-05-20 | 1975-05-20 | Earth leakage and overcurrent protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1515563A true GB1515563A (en) | 1978-06-28 |
Family
ID=10166812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2166875A Expired GB1515563A (en) | 1975-05-20 | 1975-05-20 | Earth leakage and overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1515563A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2276991A (en) * | 1993-03-22 | 1994-10-12 | B & R Electrical Plc | Protection circuit responsive to several sensors |
| GB2303005A (en) * | 1995-07-01 | 1997-02-05 | Ampy Automation Digilog | Controlling electrical supply to a consumer |
| WO1999001013A3 (en) * | 1997-06-30 | 1999-03-18 | Everbrite Inc | Apparatus and method for dimming a gas discharge lamp |
| WO1996016459A3 (en) * | 1994-11-21 | 2001-12-20 | Siemens Ag | Fault current breaker with a cumulative current converter |
| US9722513B2 (en) | 2014-11-06 | 2017-08-01 | Rockwell Automation Technologies, Inc. | Torque-based stepwise motor starting |
| US9726726B2 (en) | 2014-11-06 | 2017-08-08 | Rockwell Automation Technologies, Inc. | Single-pole, single current path switching system and method |
| US9748873B2 (en) | 2014-11-06 | 2017-08-29 | Rockwell Automation Technologies, Inc. | 5-pole based wye-delta motor starting system and method |
| US9806641B2 (en) | 2014-11-06 | 2017-10-31 | Rockwell Automation Technologies, Inc. | Detection of electric motor short circuits |
| US9806642B2 (en) | 2014-11-06 | 2017-10-31 | Rockwell Automation Technologies, Inc. | Modular multiple single-pole electromagnetic switching system and method |
| US10074497B2 (en) | 2014-11-06 | 2018-09-11 | Rockwell Automation Technologies, Inc. | Operator coil parameter based electromagnetic switching |
| US10141143B2 (en) | 2014-11-06 | 2018-11-27 | Rockwell Automation Technologies, Inc. | Wear-balanced electromagnetic motor control switching |
| US10361051B2 (en) | 2014-11-06 | 2019-07-23 | Rockwell Automation Technologies, Inc. | Single pole, single current path switching system and method |
| CN113740792A (en) * | 2021-08-27 | 2021-12-03 | 保定北特电气设备制造有限公司 | Electric leakage metering system and method after secondary open circuit of current transformer |
-
1975
- 1975-05-20 GB GB2166875A patent/GB1515563A/en not_active Expired
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2276991A (en) * | 1993-03-22 | 1994-10-12 | B & R Electrical Plc | Protection circuit responsive to several sensors |
| WO1996016459A3 (en) * | 1994-11-21 | 2001-12-20 | Siemens Ag | Fault current breaker with a cumulative current converter |
| GB2303005A (en) * | 1995-07-01 | 1997-02-05 | Ampy Automation Digilog | Controlling electrical supply to a consumer |
| WO1999001013A3 (en) * | 1997-06-30 | 1999-03-18 | Everbrite Inc | Apparatus and method for dimming a gas discharge lamp |
| US9806641B2 (en) | 2014-11-06 | 2017-10-31 | Rockwell Automation Technologies, Inc. | Detection of electric motor short circuits |
| US9806642B2 (en) | 2014-11-06 | 2017-10-31 | Rockwell Automation Technologies, Inc. | Modular multiple single-pole electromagnetic switching system and method |
| US9746521B2 (en) | 2014-11-06 | 2017-08-29 | Rockwell Automation Technologies, Inc. | 6-pole based wye-delta motor starting system and method |
| US9748873B2 (en) | 2014-11-06 | 2017-08-29 | Rockwell Automation Technologies, Inc. | 5-pole based wye-delta motor starting system and method |
| US9766291B2 (en) | 2014-11-06 | 2017-09-19 | Rockwell Automation Technologies Inc. | Cleaning and motor heating electromagnetic motor control switching |
| US9772381B2 (en) | 2014-11-06 | 2017-09-26 | Rockwell Automation Technologies, Inc. | Synchronized reapplication of power for driving an electric motor |
| US9722513B2 (en) | 2014-11-06 | 2017-08-01 | Rockwell Automation Technologies, Inc. | Torque-based stepwise motor starting |
| US9726726B2 (en) | 2014-11-06 | 2017-08-08 | Rockwell Automation Technologies, Inc. | Single-pole, single current path switching system and method |
| US10018676B2 (en) | 2014-11-06 | 2018-07-10 | Rockwell Automation Technologies, Inc. | Electromagnetic switch interlock system and method |
| US10074497B2 (en) | 2014-11-06 | 2018-09-11 | Rockwell Automation Technologies, Inc. | Operator coil parameter based electromagnetic switching |
| US10101393B2 (en) | 2014-11-06 | 2018-10-16 | Rockwell Automation Technologies, Inc. | Temperature-based electromagnetic switching |
| US10141143B2 (en) | 2014-11-06 | 2018-11-27 | Rockwell Automation Technologies, Inc. | Wear-balanced electromagnetic motor control switching |
| US10175298B2 (en) | 2014-11-06 | 2019-01-08 | Rockwell Automation Technologies, Inc. | Wellness monitoring of electromagnetic switching devices |
| US10361051B2 (en) | 2014-11-06 | 2019-07-23 | Rockwell Automation Technologies, Inc. | Single pole, single current path switching system and method |
| US10393809B2 (en) | 2014-11-06 | 2019-08-27 | Rockwell Automation Technologies, Inc. | Intelligent timed electromagnetic switching |
| CN113740792A (en) * | 2021-08-27 | 2021-12-03 | 保定北特电气设备制造有限公司 | Electric leakage metering system and method after secondary open circuit of current transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |