Protection concept

The following parameters are monitored

 

continuously and in parallel by the micro-

 

controller and displayed on the screen:

 

· AFI error (ground fault)

 

· Overheating of the cooling element

 

·

DC overvoltage

 

·

AC undervoltage/overvoltage

In the event of a fault, the conversion is immediately blocked and the grid relay disconnected.

In addition, the following protective devi- ces are provided on both grid and PV generator side:

· Grid-side varistors

Protect the power semiconductors from high-energy, time-limited voltage spikes on the grid and provide for a reduction of energy in the throttle in the event of grid disconnection.

· Generator-side varistors

Thermally monitored varistors provide pro- tection against atmospheric overvoltages (e.g. due to remote strikes during storms).

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Sunway NT 6000, NT 2600, NT 4000 user manual Protection concept