GB783602A - Improvements in or relating to protective arrangements for electrical instruments and circuits - Google Patents
Improvements in or relating to protective arrangements for electrical instruments and circuitsInfo
- Publication number
- GB783602A GB783602A GB1810353A GB1810353A GB783602A GB 783602 A GB783602 A GB 783602A GB 1810353 A GB1810353 A GB 1810353A GB 1810353 A GB1810353 A GB 1810353A GB 783602 A GB783602 A GB 783602A
- Authority
- GB
- United Kingdom
- Prior art keywords
- supply
- connection
- excessive voltage
- relay
- operate
- 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
- H02H3/50—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 appearance of abnormal wave forms, e.g. ac in dc installations
Abstract
783,602. Measuring-instruments. FRIEDRICHS, G.. June 30, 1953, No. 18103/53. Class 37. [Also in Group XXXVII] An electric motor, measuring instrument, &c. 3 is protected against connection to an unsuitable supply by a relay 6 connected to the supply terminals in series with a circuit, which includes at least two devices in parallel, and in normal circumstances does not pass enough current to operate the relay. The devices may be such as to protect against excessive voltage and reverse polarity, or against excessive voltage and connection to an A.C. supply, or against reversed polarity and connection to an A.C. supply. As shown, protection against excessive voltage is given by a neon tube 15 which operates rapidly in response to a considerable overload and a pair of rectifiers 15a which can be designed to operate on a slight overload but takes longer to become effective. Protection against connection to an A.C. supply is given by capacitor 15b. In every case the apparatus is disconnected at contacts 4 until these have been re-set manually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1810353A GB783602A (en) | 1953-06-30 | 1953-06-30 | Improvements in or relating to protective arrangements for electrical instruments and circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1810353A GB783602A (en) | 1953-06-30 | 1953-06-30 | Improvements in or relating to protective arrangements for electrical instruments and circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB783602A true GB783602A (en) | 1957-09-25 |
Family
ID=10106702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1810353A Expired GB783602A (en) | 1953-06-30 | 1953-06-30 | Improvements in or relating to protective arrangements for electrical instruments and circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB783602A (en) |
-
1953
- 1953-06-30 GB GB1810353A patent/GB783602A/en not_active Expired
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