GB539904A - An improved method and apparatus for estimating electric current in conductors - Google Patents
An improved method and apparatus for estimating electric current in conductorsInfo
- Publication number
- GB539904A GB539904A GB910840A GB910840A GB539904A GB 539904 A GB539904 A GB 539904A GB 910840 A GB910840 A GB 910840A GB 910840 A GB910840 A GB 910840A GB 539904 A GB539904 A GB 539904A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sheath
- conductors
- electric current
- spikes
- improved method
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
539,904. Current measurements. MARCHANT. E. W. May 23, 1940, No. 9108. [Class 37] The strength of an alternating current flowing in a conductor 1, which may have a non-magnetic metal sheath 2, but otherwise has such a sheath, Fig. 3 (not shown), temporarily applied to it, is measured by measuring the voltage induced in the sheath by Foucault currents by means of a voltmeter 6, which may be calibrated in amperes, between two fixed points whereat spikes 5 are applied, the spikes being insulatingly carried in a magnetic screen 3 preventing direct influence of the conductor-current on the meter circuit. The screen 3 may be only part cylindrical and support the meter, a handle being attached, or may be in the form of co-operating half-sleeves bolted together, Figs. 2 and 3, respectively (not shown).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB910840A GB539904A (en) | 1940-05-23 | 1940-05-23 | An improved method and apparatus for estimating electric current in conductors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB910840A GB539904A (en) | 1940-05-23 | 1940-05-23 | An improved method and apparatus for estimating electric current in conductors |
Publications (1)
Publication Number | Publication Date |
---|---|
GB539904A true GB539904A (en) | 1941-09-29 |
Family
ID=9865510
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB910840A Expired GB539904A (en) | 1940-05-23 | 1940-05-23 | An improved method and apparatus for estimating electric current in conductors |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB539904A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0333711A1 (en) * | 1986-07-14 | 1989-09-27 | MILLER, John S. Sr. | Current detection device having an extended frequency range of response |
WO1994010579A1 (en) * | 1992-11-05 | 1994-05-11 | N.V. Kema | Method and apparatus for measuring partial discharges in cables |
-
1940
- 1940-05-23 GB GB910840A patent/GB539904A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0333711A1 (en) * | 1986-07-14 | 1989-09-27 | MILLER, John S. Sr. | Current detection device having an extended frequency range of response |
EP0333711A4 (en) * | 1986-07-14 | 1990-01-08 | Miller John S Sr | Current detection device having an extended frequency range of response. |
WO1994010579A1 (en) * | 1992-11-05 | 1994-05-11 | N.V. Kema | Method and apparatus for measuring partial discharges in cables |
US5767684A (en) * | 1992-11-05 | 1998-06-16 | N.V. Kema | Method and apparatus for measuring partial discharges in cables |
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