Ground fault detection methods on variable frequency drive systems
US11329589B2 · kind B2 · utility
0Cited by
43References
13Claims
0Family size
Assignee
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Key dates
| Filing date | Mar 15, 2013 |
| Grant date | May 10, 2022 |
| Priority date | — |
| Expiry date | Nov 26, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/165
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A mining machine including a motor, an adjustable speed drive providing a voltage to the motor, the voltage having an excitation component comprising a magnitude and a frequency for operating the motor at a desired speed and including an additional voltage component for use in detecting a ground fault condition, and a ground fault relay for detecting a ground fault current when the ground fault current exceeds a predetermined threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.