Routing the cables
When you route the cables:
•
Install the AC power cables and the control cables on separate routes.
•
Use metallic screen cables for control cables.
•
Do not put extra cables through the MVCS without permission.
For more information, see drawing 3AES-PVS-100_120-MVCS-01-DW02.
Earthing
Always construct an earthing electrode for the MVCS. Always follow the local regulations.
Follow the minimum requirements for the earthing electrode:
•
Minimum cross-sectional area = 95 mm
2
. The plates are prepared for 95 mm
2
cables
•
Installation depth = 500...800 mm from the surface of the soil
•
Installation route around the MVCS = one meter from the outer wall
•
Connect the MVCS earthing busbar and the station enclosure to the earthing electrode.
Use joint lubricant to protect the connection point against corrosion
For more information, see grounding drawing 3AES-PVS-100_120-MVCS-02-DW02.
Protective earthing (grounding) inside the MVCS
The protective earth (PE) terminals or frames of all the main components in the MVCS are
connected to two main PE busbars located inside the station.
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, armors and protective conductors of all incoming cables to the
appropriate earthing terminals of the station.
For more information, see the grounding layout drawing
3AES-PVS-100/120-MVCS-02-DW02.
Measuring the insulation resistance of the cabling
Make sure that the insulation resistance of the external power cables are measured according
to manufacturer recommendations and local regulations.
42 Electrical installation
