GB712850A - Improvements in electrical control devices - Google Patents
Improvements in electrical control devicesInfo
- Publication number
- GB712850A GB712850A GB9552A GB9552A GB712850A GB 712850 A GB712850 A GB 712850A GB 9552 A GB9552 A GB 9552A GB 9552 A GB9552 A GB 9552A GB 712850 A GB712850 A GB 712850A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- resonant circuit
- heater
- supply
- switch
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
- H04Q9/08—Calling by using continuous ac
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Magnetic Treatment Devices (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
712,850. Thermat switches; protective systems. ELECTRICAL APPARATUS CO., Ltd. Feb. 19, 1952 [May 9, 1951], No. 95/52. Divided out of 712,824, [Group XXXV]. Class 38(5) [Also in Group XXXV] A frequency responsive switch, particularly for inclusion in a load shedding arrangement, such as described in Specification 712,824, [Group XXXV], comprises bimetal arms 25, 26 carrying contacts 27, 28, arm 26 being associated with a heater 29 which is energized from the supply source P, N through a parallel resonant circuit 34, 35 tuned to a frequency slightly below that of the normal supply, so that upon a predetermined reduction in the supply frequency the heater current is reduced to a value insufficient to maintain arm 26 in its " operated " position. A variable resistor 38 in series with the resonant circuit permits adjustment of the frequency at which the switch responds. In the arrangement shown, plug switches 43, 44 allow the heater to be in series with either the resonant circuit, so as to be frequency controlled, or a resistor 36-in which case the switch is responsive to the reduction of supply voltage. The arms 25, 26 may be provided with current shunts 32, 33 and with a magnet 30 and associated keeper 31 (or a toggle mechanism) for giving snap action and a differential between conditions necessary for make and break of the contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9552A GB712850A (en) | 1951-05-09 | 1951-05-09 | Improvements in electrical control devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9552A GB712850A (en) | 1951-05-09 | 1951-05-09 | Improvements in electrical control devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB712850A true GB712850A (en) | 1954-08-04 |
Family
ID=9698303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9552A Expired GB712850A (en) | 1951-05-09 | 1951-05-09 | Improvements in electrical control devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB712850A (en) |
-
1951
- 1951-05-09 GB GB9552A patent/GB712850A/en not_active Expired
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