Method and photovoltaic inverter for determining the insulation resistance of a photovoltaic system to ground
US11614475B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 2021 |
| Grant date | Mar 28, 2023 |
| Priority date | — |
| Expiry date | Mar 10, 2041 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E10/56
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and a photovoltaic inverter for determining the insulation resistance of a photovoltaic system relative to ground are provided. The voltage required for the measurement can be provided by an intermediate circuit in the form of an intermediate circuit voltage and a measuring device is designed to actuate an input short-circuit switch for short-circuiting a DC input with an AC disconnector open, as a result of which the intermediate circuit voltage can be applied to the DC input in the reverse direction. The measuring device is configured to record measured voltages with a switch of a voltage divider open and closed, and to determine the insulation resistance from the measured values of the two measured voltages recorded with the switch of the voltage divider open and closed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.