Current summing arrangement for ground fault detection
US5195009A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 27, 1991 |
| Grant date | Mar 16, 1993 |
| Priority date | — |
| Expiry date | Aug 27, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2083/148
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An arrangement for producing a signal representative of the vectorial sum of the currents in a plurality of electric conductors in an electrical system. The arrangement includes a current transformer associated with each of the electrical conductors, and a differential current transformer for summing the current produced by each of the current transformers in response to currents in the electrical conductors. The differential current transformer is coupled to a rectifier and resistor arrangement which allows a voltage signal to be produced which is representative of the sum of the currents in the current transformers. The voltage signal is also representative of the sum of currents in the phase conductors of the electrical system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.