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Planning the installation 45

Connection diagram for neutral grounded TN-C-S type grid

Connection diagram for neutral grounded TT type grid

 Corner grounded TN and TT type grids

Connection diagrams for three PVS300 solar inverters to corner grounded TN and TT

grids are shown in the following figures. In a corner grounded TN or TT type grid, the

voltage seen by a given PVS300 inverter is the line-to-line or line-to-earth voltage.

The allowed line-to-line RMS voltages are 208, 220, 230 and 240 V.

Note: In corner grounded TN or TT type grids, the PVS300 inverter may generate an

increased amount of leakage current to earth, potentially causing nuisance trips of

any external residual current device (RCD). The amount of leakage current depends

on the construction of PV installation, type of PV panels used and also weather

conditions. Therefore, an exact value for leakage current cannot be given or

calculated.

The inverter has an integrated DC and AC sensitive residual current monitoring unit

(RCMU) which can detect residual (fault, leakage) currents. During grid feeding

operation the inverter monitors residual currents. The inverter disconnects

Earth

230 V

Earth

230 V

Earth

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ABB PVS300 Handbuch Seite 45