Ground fault protective system including an impedance responsive oscillator
US3935510A · kind A · utility
1Cited by
3References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 25, 1974 |
| Grant date | Jan 27, 1976 |
| Priority date | — |
| Expiry date | Feb 25, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/331
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ground fault protective system and method in which an impedance responsive oscillator detects low impedance ground faults on the neutral conductor of an electrical distribution circuit and responds thereto to provide a partially or totally attenuated output signal. A level detector senses the magnitude of the output signal of the oscillator and causes a trip circuit to open contacts in the electrical distribution circuit whenever the attenuated oscillator output signal occurs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.