Solid-state trip device comprising a zero sequence current detection circuit
US4899246A · kind A · utility
129Cited by
2References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1988 |
| Grant date | Feb 6, 1990 |
| Priority date | — |
| Expiry date | Mar 1, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/105
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A signal representative of the zero sequence current is obtained from current transformers associated with each phase and with the neutral if applicable by separate summing, in two distinct conductors, of the positive half-wave currents and of the absolute value of the negative half-wave currents produced by the set of current transformers, the difference between the currents flowing through these two conductors being representative of the zero sequence current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.