Method for detecting ground faults on the conductors of an electrical machine
US5739693A · kind A · utility
16Cited by
9References
10Claims
0Family size
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Inventor
Key dates
| Filing date | Sep 1, 1994 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Sep 1, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/346
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method is specified for detecting ground faults on the conductors of an electrical machine, in which method the conductors of the machine are biased with respect to ground by means of an injection voltage (Ui). An optimum utilization of the injection transformer (5) is achieved when the injection signal (Ui) comprises in the transmission period (S) a square-wave signal which switched over periodically between a positive and a negative maximum and has at the start and at the end of the transmission period (S) a quarter-period either of the positive or of the negative maximum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.