Electrical measuring device
US4894609A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1987 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | May 26, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R15/242
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The disclosed porcelain insulator has built-in optical transmission media extending therethrough from a base metal secured at one end thereof to a conductor-holding fixture at the opposite end thereof. The conductor-holding fixture may carry one or both of two type sensing units: namely, a sensing unit having a current transformer (CT) coupled to the phase conductor, a load resistor connected to the CT, and an electro-optic element coupled to both said load resistor and said optical transmission medium; and another sensing unit having a capacitive potential transformer (PT) coupled to said conductor and an electro-optic element coupled to both said PT and said optical transmission medium. An electric measuring device is formed by applying light to the electro-optic element through the optical transmission medium of the insulator, modulating the incident light by the electro-optic element depending on the line current or voltage, receiving the modulated light through the optical transmission medium of the insulator, converting the modulation of the received light into an electric signal. Due to information detection right by the line conductor and optical transmission of the informa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.