GB721398A - Improvements in or relating to electrical phase-sensitive devices and the like - Google Patents
Improvements in or relating to electrical phase-sensitive devices and the likeInfo
- Publication number
- GB721398A GB721398A GB2133552A GB2133552A GB721398A GB 721398 A GB721398 A GB 721398A GB 2133552 A GB2133552 A GB 2133552A GB 2133552 A GB2133552 A GB 2133552A GB 721398 A GB721398 A GB 721398A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- current
- pulse
- power factor
- occur
- 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
- 239000003990 capacitor Substances 0.000 abstract 2
- 230000007935 neutral effect Effects 0.000 abstract 1
- 230000002441 reversible effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/02—Details
- H01J17/36—Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for
Landscapes
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
721,398. Valve relay circuits. WATFORD ELECTRIC & MANUFACTURING CO., Ltd. Aug. 17, 1953 [Aug. 25, 1952], No. 21335/52. Class 40 (6). In a phase sensitive device in which one or other of two gas-filled valves V1, V2 is fired when the input to the grids leads or lags the anode supply, a third valve V3 is arranged with its anode supply in quadrature so that, when short pulses of current occur in the associated valve V2, long pulses occur in the valve V3. The invention is stated to prevent chatter in relays and is used for the connection and disconnection of power factor correcting capacitors. The valves V2, V1 are energized in antiphase, Fig. 3, and are normally maintained non-conducting by bias derived from potentiometers P1, P2. A current transformer CT feeds pulses 33, 34 over a peaking transformer T2 which occur when there is no positive potential on the anodes when the system is operating at unity power factor. If the current lags the voltage, the pulse 33 fires valve V1 which remains conducting for most of the remaining half-cycle, providing adequate current to operate relay K1. When the current leads, the pulse 34 fires valve V2 near the end of the half cycle causing a short pulse of current to flow in valve V2. A voltage pulse is applied to valve V3 which is energized from phase C and neutral N and is thus in quadrature with the voltage from phases A and B. Current flows for at.least a quarter-cycle, increasing as the current leads further. Relays K1, K2 operate a reversible motor operating cams to connect and disconnect power factor correcting capacitors.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2133552A GB721398A (en) | 1952-08-25 | 1952-08-25 | Improvements in or relating to electrical phase-sensitive devices and the like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2133552A GB721398A (en) | 1952-08-25 | 1952-08-25 | Improvements in or relating to electrical phase-sensitive devices and the like |
Publications (1)
Publication Number | Publication Date |
---|---|
GB721398A true GB721398A (en) | 1955-01-05 |
Family
ID=10161141
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2133552A Expired GB721398A (en) | 1952-08-25 | 1952-08-25 | Improvements in or relating to electrical phase-sensitive devices and the like |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB721398A (en) |
-
1952
- 1952-08-25 GB GB2133552A patent/GB721398A/en not_active Expired
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