GB1520736A - Electrical protection circuits - Google Patents
Electrical protection circuitsInfo
- Publication number
- GB1520736A GB1520736A GB2953274A GB2953274A GB1520736A GB 1520736 A GB1520736 A GB 1520736A GB 2953274 A GB2953274 A GB 2953274A GB 2953274 A GB2953274 A GB 2953274A GB 1520736 A GB1520736 A GB 1520736A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- energize
- july
- lamp
- current
- 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
- H02H3/44—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 the rate of change of electrical quantities
-
- 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
-
- 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
- H02H3/16—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 fault current to earth, frame or mass
- H02H3/162—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 fault current to earth, frame or mass for ac systems
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
1520736 Protective systems H W CHAU 2 July 1975 [3 July 1974] 29532/74 Heading H2K Arrangements are described which both indicate and protect against the occurrence of earth leakages and short circuits. Earth leakage results in a current on line 38 in phase with the secondary voltage of transformer 48. Amplifier 42 can then switch on during a positive half cycle to energize a meter relay 52 and thus, via relay 62, circuit breaker 24 and a latching relay 74 for lamp 78. Short circuit produces a sudden pulse of current through inductor 22 and the resultant induced voltage triggers either a thyristor 96 or another meter relay to energize a lamp relay 108 and the circuit breaker.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2953274A GB1520736A (en) | 1975-07-02 | 1975-07-02 | Electrical protection circuits |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2953274A GB1520736A (en) | 1975-07-02 | 1975-07-02 | Electrical protection circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1520736A true GB1520736A (en) | 1978-08-09 |
Family
ID=10293027
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2953274A Expired GB1520736A (en) | 1975-07-02 | 1975-07-02 | Electrical protection circuits |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1520736A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0404406A2 (en) * | 1989-06-21 | 1990-12-27 | Orc Manufacturing Co., Ltd. | Light source unit for using exposure |
-
1975
- 1975-07-02 GB GB2953274A patent/GB1520736A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0404406A2 (en) * | 1989-06-21 | 1990-12-27 | Orc Manufacturing Co., Ltd. | Light source unit for using exposure |
EP0404406A3 (en) * | 1989-06-21 | 1991-08-28 | Orc Manufacturing Co., Ltd. | Light source unit for using exposure |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |