INTKM01 ABB  Operator unit

With reference to Standard IEC 61936, Power installations exceeding 1 kV a.c. – Part 1: Common rules, the entire subclause 7.5 is dedicated to the requirements for buildings used as substations.

The Standard underscores how areas containing switchgear and controlgear must be designed to prevent the ingress of water and to minimize condensation. The materials used for the walls, ceilings and floors on the ground shall not be damaged by water penetration or leakage. More specifically, the constituent materials of the external enclosures shall be capable of withstanding the attacks of atmospheric elements (rain, sun, aggressive wind, etc.).

The Standard specifies that indoor climate conditions shall be established e.g. by adequate cooling, heating, dehumidifying, ventilation (so-called HVAC systems) or by adequate design of the building. Generally speaking, use of natural ventilation is to be preferred. Forced ventilation systems must be monitored. Ventilation openings should not be positioned in front of, or in the vicinity of MV switchgear and must be able to prevent the ingress of foreign bodies or vermin.

When HVAC systems are chosen, care must be taken to prevent chemically aggressive substances, which may be hazardous to the correct function of the equipment in the installation, from entering the substation. Filters or heat exchangers must be provided if necessary.

If there is no MV/LV transformer, the thermal conductivity of the substation walls must be 0.3 to 3 W•K-1•m-1, such as to thermally insulate the substation. Since the entrance doors are areas where a great deal of heat is exchanged with the outside environment, great attention must be paid to their positions and to the choice of materials and finishes. Firstly, the substation must be watertight, especially its floor and roof.

The structure and details of the product：

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