Optical instrument transformer
US5128608A · kind A · utility
15Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 26, 1990 |
| Grant date | Jul 7, 1992 |
| Priority date | — |
| Expiry date | Oct 26, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical instrument transformer can measure both current and voltage of the primary conductor. Measurement of current is made through modulation effect of a light signal by the optical magnetic-field sensor, and measurement of voltage is made through modulation effect of a light signal by the optical electric-field sensor, by measuring the voltage between a conductor member and an upper flange the of the a bushing, which has a value divided in a dividing ratio determined by the capacitance between the conductor member (4a) and the upper flange and the capacitance between the upper flange and ground.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.