Electrical installation 41
Protective earthing (grounding) inside the megawatt
station
The protective earth (PE) terminals or frames of all of the main components in the
megawatt station are connected to the two main PE busbars located at the corners of the
building. At the installation site:
• Measure the continuity of all internal PE connections by measuring the conductivity
between each protective earth terminal and the main PE busbar.
• Earth the shields, armours and protective conductors of all incoming cabling to the
appropriate earthing terminals of the station.
Refer to drawing 3AES-SH_4600-02-DW02 for the factory-installed internal PE
connections, and the connection point of the external grounding electrode.
Measuring the insulation resistances
Make sure that the insulation resistances of the external power cables are measured
according to the local regulations.
Connecting the DC cabling from the solar generator to
the inverters
WARNING! Make sure that the cable entry is sealed to maintain the IP
classification of the inverter.
Refer to the PVS980 hardware manual (3AXD50000026013 [EN]) and the wiring diagrams
that are delivered with the megawatt station.
To connect the cabling:
1. Remove the covers of the cable entries.
2. Lead the cables into the megawatt station and seal the entry with the gland plates that
come with the inverter.
3. Connect the cables to the correct terminals in the inverters. Tighten the connections to
the torques given in the PVS980 commissioning and maintenance manual
(3AXD50000046782 [EN]).
4. Fill the cable trenches and seal the cable entries (refer to Finalizing the installation on
page 43).
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