GB339661A - Improvements in and relating to alternating electric current measurement devices - Google Patents
Improvements in and relating to alternating electric current measurement devicesInfo
- Publication number
- GB339661A GB339661A GB2415529A GB2415529A GB339661A GB 339661 A GB339661 A GB 339661A GB 2415529 A GB2415529 A GB 2415529A GB 2415529 A GB2415529 A GB 2415529A GB 339661 A GB339661 A GB 339661A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- ammeter
- carried
- portions
- relating
- 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
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
339,661. Ferranti, Ltd., and Holmes, W. Aug. 7, 1929. Transformers, - For measuring alternating currents, an ammeter a is combined with a transformer, the core of which is in two parts d, e, which can be separated so that the core can be placed around a conductor carrying the current to be measured. The portions d, e of the core are of L-shape and meet with butt joints, at b, c. The core portions are carried by members g, h hinged at i and having handles p, j by which they may be opened against the pressure of a spring k. At the contact faces b, c of the core, the section of the iron may be the same as that of the limbs, or may be greater in order to reduce the reluctance of the contact. To ensure correct bedding at the joints, the part d of the core is pivoted at m to a brass piece n secured to the member h, so as to permit slight movement about the pivot. The ammeter a may be of the moving-coil rectifier type and is connected to a secondary winding o carried by the part e of the core. The winding o may be tapped to provide different ranges of measurement, or several secondary windings of different numbers of turns may be provided, a switch being arranged to change the range. The aperture formed bv the core mav be insulated internally to facilitate manipulation around bare bus-bars.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2415529A GB339661A (en) | 1929-08-07 | 1929-08-07 | Improvements in and relating to alternating electric current measurement devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2415529A GB339661A (en) | 1929-08-07 | 1929-08-07 | Improvements in and relating to alternating electric current measurement devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB339661A true GB339661A (en) | 1930-12-08 |
Family
ID=10207251
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2415529A Expired GB339661A (en) | 1929-08-07 | 1929-08-07 | Improvements in and relating to alternating electric current measurement devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB339661A (en) |
-
1929
- 1929-08-07 GB GB2415529A patent/GB339661A/en not_active Expired
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