Method for insulation monitoring of a converter-supplied power supply system
US11391785B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 9, 2019 |
| Grant date | Jul 19, 2022 |
| Priority date | — |
| Expiry date | Sep 21, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method for determining an insulation resistance and for locating insulation faults in a power supply system whose active parts are ungrounded and which is supplied via a converter operated grounded and equipped with controlled power semiconductor switches. A common-mode voltage against ground is generated at the output of the converter and is superimposed on the ungrounded network as an active measuring voltage in order to measure the insulation resistance. The direct integration of the generation of the common-mode measuring voltage in the converter allows cost-effective implementation including similarly comprehensive insulation monitoring functions as those possible in fully ungrounded power supply systems. Furthermore, the method for determining the insulation resistance can be expanded into a method for locating insulation faults and thus for locating faulty system branches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.