Sungrow SG2500U-MV, Системное руководство

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5 Mechanical Installation System Manual
26
The foundation plan described in this chapter is for reference only; please consult
on-site professional project personnel before project construction.
20# channel steel is pre-embedded on the front and back side of the foundation surface so
that the foundation of MV Station can be welded with the foundation after the mechanical
installation.
The pre-embedded channel steel must be horizontal with the rest part of foundation upper
surface; the pre-embedded steel sheet must be firm and reliable.
According to the on-site actual conditions, water discharge system is designed and
constructed at the bottom of foundation to avoid steeper.
The oil groove of oil-immersed transformer is designed at the bottom of foundation.
Adequate support is prepared for the oil groove. The grounding design of oil groove is in
accordance with the local standard or code.
An exclusive oil discharge outlet is designed for the oil groove.
In the construction of foundation, the grounding body is pre-embedded. One end of the
grounding body is welded with the main grounding network of power plant while the other
end is welded with the pre-embedded channel steel in the foundation to assure firm welding
quality. The embedded grounding pole must be in accordance with the installation codes.
The maintenance entry is designed for the foundation; if needed, the working personnel
can enter into the foundation for required operation.
It is recommended to build up steps at the inlet of MV Station for convenient access. The
step width and level are reasonably selected according to the on-site actual conditions.
For convenient late maintenance and repair work, a proper maintenance area is
constructed around the foundation according to the on-site actual conditions. The
maintenance area enjoys an adequate bearing capacity and levelness and conforms to the
local standard/code.
Both ends of all the pre-embedded pipes are temporarily sealed to prevent impurities;
otherwise, it is inconvenient for laying cables in the late period.
Upon connection of all the electrical cables, the cable inlet and outlet and joint are sealed
by refractory mud or other appropriate materials to prevent entrance of rodents.
Please refer to the said drawing and other related drawings for the rest recommended
dimensions.
Pre-bury grounding units according to relevant standards of the country/region
where the project is located.
5.3.4 Other Precautions
A drainage system should be designed on the installation site to prevent the MV
Station from being immersed in water during heavy rainfalls.
Do not plant any trees near the MV Station installation site to prevent the damage
of MV Station by tree leaves or stems.