GB627552A - Improvements in and relating to electromagnetic protective relays - Google Patents
Improvements in and relating to electromagnetic protective relaysInfo
- Publication number
- GB627552A GB627552A GB19401/45A GB1940145A GB627552A GB 627552 A GB627552 A GB 627552A GB 19401/45 A GB19401/45 A GB 19401/45A GB 1940145 A GB1940145 A GB 1940145A GB 627552 A GB627552 A GB 627552A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coils
- armature
- contacts
- motor
- stated
- 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
- 230000001681 protective effect Effects 0.000 title abstract 2
- 230000004907 flux Effects 0.000 abstract 1
- 230000003472 neutralizing effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection
- H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor And Converter Starters (AREA)
Abstract
627,552. Electromagnetic relays; control of motors. BRITISH THOMSON-HOUSTON CO., Ltd. July 30, 1945, No. 19401. Convention date, Aug. 5, 1944. [Classes 38(iii) and 38(v)] An electromagnetic protective relay for a three-phase motor comprises two coils 1, 2 arranged substantially at right angles with one another, a pivoted armature 7, and contacts 11 operated by the armature. The coils are connected in two of the supply lines to the motor and it is stated in the Specification that the armature normally occupies a central position, the rotary forces due to the two coils neutralizing each other. In the event of failure of either of the two lines having the coils, one of the coils will be de-energized, and an insulating extension 9 of the armature will separate the contacts 11, thereby opening the main circuit-breaker 15. Should a failure occur in the line not having a relay coil, the current in one of the remaining phases will be reversed so that the resultant flux will, it is stated, be substantially at right angles with the centre line of the cylinder 4, thereby causing contacts 11 to be opened. The armature may be restored to its normal position by hand or by a spring, after which the motor is restarted by pressing button 17.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US627552XA | 1944-08-05 | 1944-08-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB627552A true GB627552A (en) | 1949-08-11 |
Family
ID=22044573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19401/45A Expired GB627552A (en) | 1944-08-05 | 1945-07-30 | Improvements in and relating to electromagnetic protective relays |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB627552A (en) |
-
1945
- 1945-07-30 GB GB19401/45A patent/GB627552A/en not_active Expired
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