GB685244A - Improvements in or relating to electrical indicating instruments - Google Patents
Improvements in or relating to electrical indicating instrumentsInfo
- Publication number
- GB685244A GB685244A GB2485850A GB2485850A GB685244A GB 685244 A GB685244 A GB 685244A GB 2485850 A GB2485850 A GB 2485850A GB 2485850 A GB2485850 A GB 2485850A GB 685244 A GB685244 A GB 685244A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- opening
- meter
- conductor
- magnetic
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/188—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers comprising rotatable parts, e.g. moving coils
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
685,244. Ammeters; wattmeters. GENERAL ELECTRIC CO., Ltd., and RUDGE, T. R. Oct. 18, 1951 [Oct. 11, 1950], No.. 24858/50. Class 37. [Also in Group XXXV] In an instrument indicating in dependence on the flux in a closed magnetic path at least the major part of which is formed by a ferro-magnetic core, an opening is provided in the core into which a conductor may be inserted from outside the core, the opening being bridged by a part of the core and means being provided for locating the conductor in the opening relative to the axis of the magnetic path. The ammeter shown comprises a housing 1 enclosing a moving coil meter 3 and the major part of a closed laminated core 14 of nickel-iron alloy. The core is formed with an opening 18 extending inwards for about three-quarters of the width of the core and having a flat edge 21 and a V-shaped edge 22. Two pole-pieces 23, 24 thus project from the casing and are coated with cellulose acetate. A coil 25 is wound on the core and is connected to the meter 3 through a rectifier. A conductor 26 carrying A.C. to be measured is brought into the opening 18 and pressed into the notch 22, thereby locating it so that its centre is at a predetermined distance from the magnetic axis through the core 14. An alternating flux is set up in the core 14 and the meter 3 measures the current in the conductor 26. A range-change switch by which resistances are inserted in series with the meter may be provided in the housing. An elongated electric lamp, such as a fluorescent lamp, may be passed through the central opening 27 in the core 14 so that its operating current may be measured. In a modification the core 14 may be broken at a point opposite the opening 18 to provide a gap in which the moving coil of the meter 3 may be mounted. The invention is applicable to other instruments such as wattmeters.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2485850A GB685244A (en) | 1950-10-11 | 1950-10-11 | Improvements in or relating to electrical indicating instruments |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2485850A GB685244A (en) | 1950-10-11 | 1950-10-11 | Improvements in or relating to electrical indicating instruments |
Publications (1)
Publication Number | Publication Date |
---|---|
GB685244A true GB685244A (en) | 1952-12-31 |
Family
ID=10218354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2485850A Expired GB685244A (en) | 1950-10-11 | 1950-10-11 | Improvements in or relating to electrical indicating instruments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB685244A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2219409A (en) * | 1988-03-21 | 1989-12-06 | John Timothy Murray | Assessing fuse ratings |
GB2265016A (en) * | 1992-03-14 | 1993-09-15 | Ampy Automation Digilog | Electricity meters |
-
1950
- 1950-10-11 GB GB2485850A patent/GB685244A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2219409A (en) * | 1988-03-21 | 1989-12-06 | John Timothy Murray | Assessing fuse ratings |
GB2265016A (en) * | 1992-03-14 | 1993-09-15 | Ampy Automation Digilog | Electricity meters |
GB2265016B (en) * | 1992-03-14 | 1996-05-29 | Ampy Automation Digilog | Improvements in and relating to electricity meters |
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