Fail-safe operating method for a decentralized power generation plant
AssigneeSMA Solar Technology AG
InventorsMichael Viotto, Martin Putz, Christian Tschendel
Life of this patent
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Abstract
A fail-safe operating method for a decentralized power generation plant DG includes determining a leakage capacitance of a generator of the DG before connecting the DG. The method also includes comparing the determined leakage capacitance with a predetermined first limit value, and connecting the DG to a grid only if the determined leakage capacitance is smaller than the predetermined first limit value. A decentralized power generation plant is configured to perform the method.
Claims19
A method of operating a decentralized power generation plant (DG), comprising:
- prior to connecting the DG to a grid, applying at least two voltage values to connecting lines of a generator of the DG,
- determining a leakage capacitance of the generator of the DG based on currents or current transients caused by the application of the at least two voltage values, and
- selectively connecting the DG to the grid based on the determined leakage capacitance.
A decentralized power generation plant (DG), comprising:
- an insulation monitoring circuit configured to perform an act of determining a value of a leakage capacitance of a generator of the DG, wherein the determining is based on currents or current transients caused by an application of at least two voltage values to connecting lines of a generator of the DG, and
- a residual current circuit breaker coupled to the insulation monitoring circuit and configured to perform an act of selectively connecting the DG to a grid via a grid relay based on the determined leakage capacitance value to ensure that the DG remains disconnected from the grid when the determined leakage capacitance satisfies a predetermined criteria.
Dependencies are inferred from the claim text.