GB672931A - Improvements in systems of control for electrical apparatus - Google Patents
Improvements in systems of control for electrical apparatusInfo
- Publication number
- GB672931A GB672931A GB1596349A GB1596349A GB672931A GB 672931 A GB672931 A GB 672931A GB 1596349 A GB1596349 A GB 1596349A GB 1596349 A GB1596349 A GB 1596349A GB 672931 A GB672931 A GB 672931A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- amplifier
- contact
- relays
- 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
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
- H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
Abstract
672,931. Valve circuits; radio signalling. GENERAL ELECTRIC CO., Ltd., and NETTLESHIP, T. G. P. May 3, 1950 [June 15, 1949], No. 15963/49. Classes 40 (v) and 40 (vi). A control apparatus for a pair of valve devices and a pair of power units therefor comprises manually operated switches whereby either valve device may be brought into service with either power unit and automatic means for changing over to the spare valve device or power unit on the occurrence of a fault. The circuit shown is associated with two receiver-amplifiers (A and B, not shown), and two power units (A and B, not shown) of a radio relay link. To bring the A units into operation non-locking keys ARK and APK are depressed to ensure that relays R and P are released, and switch SK is then operated. This operates relay S, the contacts of which operate relays ACH and BCH respectively, switching on the filaments of the amplifiers. When the filaments have warmed up relays ACD and BCD operate. Contact ACD1 operates relay AH which connects the full H.T. to amplifier A and contact BCD2 operates relay BL which connects a low H.T. to amplifier B to prevent the valves from deteriorating. Contact ACD1 also operates relay AW which connects the input and output lines to amplifier A. To change over to amplifier B switch BRK is momentarily operated, operating a main controlling relay R which locks in. Contact R2 moves the input and output lines to amplifier B by operating relay BW and releasing relay AW. Contact R3 in changing over does not alter the condition of the low power switching relays AL and BL since delay contact ACD2 has already operated but contacts R4 and R5 release relay S and operate relay C causing power unit A to be connected to amplifier B and vice versa, by means of contacts, not shown. A similar change-over would have occurred if a fault had developed in amplifier A for this would have caused the fault relay ALF to operate and its contact ALF1 to operate relay R as before. Contact ALF2, however, releases relay ACH and thus switches off the filaments of amplifier A. A further contact could be provided to operate an alarm. The S and C contacts ensure that the correct power unit is switched off even though the A and B units may be cross-connected. The changeover of power units on the occurrence of a fault or manually is effected by fault relays APF and BPF or switch BPK and by relay P operating in a similar manner to relay R. It is stated that the change-over of input and output lines of the amplifier alternatively could be effected by contacts or relays S and C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1596349A GB672931A (en) | 1949-06-15 | 1949-06-15 | Improvements in systems of control for electrical apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1596349A GB672931A (en) | 1949-06-15 | 1949-06-15 | Improvements in systems of control for electrical apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB672931A true GB672931A (en) | 1952-05-28 |
Family
ID=10068733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1596349A Expired GB672931A (en) | 1949-06-15 | 1949-06-15 | Improvements in systems of control for electrical apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB672931A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2281178A (en) * | 1993-08-17 | 1995-02-22 | Nokia Telecommunications Oy | Repeater backup arrangement for securing operation of a telecommunications network in a cellular radio system |
| GB2332341A (en) * | 1997-12-02 | 1999-06-16 | Nec Corp | Reducing power consumption in a telephone base station in the event of a fault |
-
1949
- 1949-06-15 GB GB1596349A patent/GB672931A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2281178A (en) * | 1993-08-17 | 1995-02-22 | Nokia Telecommunications Oy | Repeater backup arrangement for securing operation of a telecommunications network in a cellular radio system |
| US5551056A (en) * | 1993-08-17 | 1996-08-27 | Nokia Telecommunications Oy | Method for securing the operation of a telecommunications network in a cellular radio system and a base station arrangement |
| GB2281178B (en) * | 1993-08-17 | 1997-08-13 | Nokia Telecommunications Oy | A method for securing the operation of a telecommunications network in a cellular radio system and a base station arrangement |
| GB2332341A (en) * | 1997-12-02 | 1999-06-16 | Nec Corp | Reducing power consumption in a telephone base station in the event of a fault |
| US6353747B1 (en) | 1997-12-02 | 2002-03-05 | Nec Corporation | Portable cellular phone base station |
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