GB460708A - Improvements relating to portable electric current transformers - Google Patents
Improvements relating to portable electric current transformersInfo
- Publication number
- GB460708A GB460708A GB18786/35A GB1878635A GB460708A GB 460708 A GB460708 A GB 460708A GB 18786/35 A GB18786/35 A GB 18786/35A GB 1878635 A GB1878635 A GB 1878635A GB 460708 A GB460708 A GB 460708A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- measured
- transformer
- windings
- pair
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
- B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
- B60Q1/1438—Actuating means for dimming masks or screens
-
- 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
- H01F38/30—Constructions
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
460,708. Current transformers; calibrating meters. ALLGEMEINE ELEKTRICITATS-GES. July 1, 1935, No. 18786. Convention date, June 30, 1934. [Class 38 (ii)] [Also in Group XXXVI] A portable transformer for measuring A.C. or D.C. in straight conductors comprises a pair of annular cores 2, 3 divided so that they may be placed round a conductor 11 carrying the current to be measured, the cores carrying a pair of oppositely connected auxiliary excitation windings 4, 5 and a pair of series-connected secondary windings 7, 8. When D.C. is to be measured, the auxiliary windings 4, 5 are fed with A.C. from an auxiliary source (such as a commutator switching arrangement mounted on the transformer) so as to produce alternating fluxes acting oppositely on the secondaries. The additional effect of the D.C. in the conductor 11 is to produce a resultant alternating flux which produces a voltage at the secondary terminals proportional to the D.C. flowing. When A.C. is to be measured the auxiliary windings 4, 5 are disconnected. The core parts may be hinged together and provided with handles to form tongs. A measuring instrument may be mounted on the transformer. The instrument may be calibrated by comparison with current readings obtained by passing current through an ampere-hour meter for a measured period of time and dividing the meter readings by the time. To facilitate calculation, the number of units of time during which current is allowed to flow is made equal to the transformer ratio, or to a simple fraction or multiple of it.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE460708X | 1912-07-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB460708A true GB460708A (en) | 1937-02-01 |
Family
ID=6539776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB18786/35A Expired GB460708A (en) | 1934-06-30 | 1935-07-01 | Improvements relating to portable electric current transformers |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR460708A (en) |
GB (1) | GB460708A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3386032A (en) * | 1966-04-28 | 1968-05-28 | Franklin Lewis B | Removable core structures for electrical devices |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1151475B (en) * | 1960-05-06 | 1963-07-18 | Paul Wittstock | Anti-glare device for lights, especially for street lights |
-
1913
- 1913-07-24 FR FR460708D patent/FR460708A/en not_active Expired
-
1935
- 1935-07-01 GB GB18786/35A patent/GB460708A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3386032A (en) * | 1966-04-28 | 1968-05-28 | Franklin Lewis B | Removable core structures for electrical devices |
Also Published As
Publication number | Publication date |
---|---|
FR460708A (en) | 1913-12-10 |
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