Zero-current detector for high voltage DC transmission line
US4280093A · kind A · utility
8Cited by
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8Claims
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Assignee
Inventor
Key dates
| Filing date | Aug 27, 1979 |
| Grant date | Jul 21, 1981 |
| Priority date | — |
| Expiry date | Aug 27, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/175
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A saturable magnetic reactor is disposed about one of the current-carrying conductors in a DC power transmission line. A zero-current status for the transmission line is sensed by means of impedance changes in the reactor. A step-down transformer cascade electromagnetically couples the saturable reactor to impedance detection means, which means typically comprise an oscillator driven bridge circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.