Safety device for a photovoltaic system
AssigneeSMA Solar Technology AG
InventorsJens Friebe, Sebastian Bieniek
Life of this patent
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Abstract
The disclosure relates to a safety device for a photovoltaic system for feeding into a power supply system, that includes at least one input for connection to a PV generator, at least one output for connection to an inverter, and a switching element for de-energizing the at least one output. The safety device includes an evaluating unit configured to switch the switching element based on a low-frequency signal at the at least one output. The disclosure also relates to a method for operating such a safety device.
Claims19
A safety device for a photovoltaic system for feeding into a power supply system, the safety device comprising:
- at least one input for connection to a PV generator;
- at least one output for connection to an inverter;
- a switching element for de-energizing the at least one output;
- and
- an evaluating unit configured to switch the switching element based on a low-frequency signal present at the at least one output.
A method for operating a safety device for a photovoltaic system for feeding into a power supply system, the safety device comprising at least one input for connection to a PV generator and at least one output for connection to an inverter, and comprising a switching element for de-energizing the at least one output, comprising:
- determining a level of a low-frequency signal at the at least one output;
- connecting the at least one output to the at least one input, if the level of the low-frequency signal is above a first threshold value;
- and
- de-energizing the at least one output if the level of the low-frequency signal is below a second threshold value.
Dependencies are inferred from the claim text.