1.1 Scope
This standard specifies the service conditions, rated characteristics, general structural requirements and test methods of HV/LV or LV/HV prefabricated substations, which are cable-connected, to be operated from inside (walk-in type) or outside (non-walk-in type) for alternating current of rated voltages at 3.6 kV~40.5 kV on the HV side, and for one or more transformers for service frequencies up to and including 50 Hz for outdoor installation in locations with public accessibility.
Note: the prefabricated substations with overhead line may make reference to this standard.
Prefabricated substations can be situated at ground level or partially or completely below ground level.
In general, a prefabricated substation comprises the following main components (functions) and parts:
- Enclosure;
- Power transformers;
- HV switchgear and controlgear;
- LV switchgear and controlgear;
- HV and LV interconnections;
- Auxiliary equipment and circuits.
However, relevant provisions of this standard are applicable to designs where not all these components exist (for example, an installation consisting of power transformer and LV switchgear and controlgear).
Note: non-prefabricated substations shall comply with the service requirements of IEC 61936-1:2002.
