GB682962A - Improvements in dash-pots for use in electric protective devices - Google Patents
Improvements in dash-pots for use in electric protective devicesInfo
- Publication number
- GB682962A GB682962A GB2797449A GB2797449A GB682962A GB 682962 A GB682962 A GB 682962A GB 2797449 A GB2797449 A GB 2797449A GB 2797449 A GB2797449 A GB 2797449A GB 682962 A GB682962 A GB 682962A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- armature
- lag
- protective devices
- electric protective
- 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
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/44—Automatic release mechanisms with or without manual release having means for introducing a predetermined time delay
- H01H71/443—Automatic release mechanisms with or without manual release having means for introducing a predetermined time delay with dash-pot
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/1081—Modifications for selective or back-up protection; Correlation between feeder and branch circuit breaker
Landscapes
- Breakers (AREA)
Abstract
682,962. Retarding action of switches. BRITISH THOMSON-HOUSTON CO., Ltd., and GIBSON, A. C. Sept. 13, 1950 [Nov. 1, 1949), No. 27974/49. Drawings to Specification. Class 38 (v) [Also in Group XXXII] A dashpot (see Group XXXII) for providing a time-lag in the operation of over-current electric protective devices, which is normally an inverse function of the force applied to the dashpot piston by the armature of a relay forming the device, is so constructed as to produce a change in the function and a consequently reduced time-lag when the applied force exceeds a predetermined amount. The armature is associated with contacts which when closed, effect energisation of the trip-coil of a circuit breaker, or may be directly associated with the trip coil itself. Where the devices are connected in series a measure of discrimination in deciding the circuit-breaker to be tripped, is obtained, both for over-load currents and currents of short-circuit magnitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2797449A GB682962A (en) | 1949-11-01 | 1949-11-01 | Improvements in dash-pots for use in electric protective devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2797449A GB682962A (en) | 1949-11-01 | 1949-11-01 | Improvements in dash-pots for use in electric protective devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB682962A true GB682962A (en) | 1952-11-19 |
Family
ID=10268249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2797449A Expired GB682962A (en) | 1949-11-01 | 1949-11-01 | Improvements in dash-pots for use in electric protective devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB682962A (en) |
-
1949
- 1949-11-01 GB GB2797449A patent/GB682962A/en not_active Expired
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