DS/EN IEC 62271-202:2022/AC:2023

High-voltage switchgear and controlgear - Part 202: AC prefabricated substations for rated voltages above 1 kV and up to and including 52 kV

This part of IEC 62271 specifies the service conditions, rated characteristics, general structural requirements and test methods of enclosed high-voltage prefabricated substations. These prefabricated substations are cable-connected to AC high-voltage networks with an operating voltage up to and including 52 kV and power frequencies up to and including 60 Hz. They can be manually operated from inside (walk-in type) or from outside (non-walk-in type). They are designed for outdoor installation at locations with public accessibility and where protection of personnel is provided.*These prefabricated substations can be situated at ground level or partially or completely below ground level. The last are also called underground prefabricated substations.*In general, two types of prefabricated substations are considered in this document:*- high-voltage switchgear prefabricated substations;*- high-voltage/low-voltage transformer prefabricated substations (step-up and step-down).*A high-voltage switchgear prefabricated substation comprises an enclosure containing in general the following electrical components:*- high-voltage switchgear and controlgear;*- auxiliary equipment and circuits.*A high-voltage/low-voltage transformer prefabricated substation comprises an enclosure containing in general the following electrical components:*- power transformer(s);*- high-voltage and low-voltage switchgear and controlgear;*- high-voltage and low-voltage interconnections;*- auxiliary equipment and circuits.*However, relevant provisions of this document are applicable to designs where not all these electrical components exist (for example, a prefabricated substation consisting of power transformer and low-voltage switchgear and controlgear).*The listed electrical components of a high-voltage/low-voltage transformer prefabricated substation can be incorporated in the prefabricated substation either as separate components or as an assembly type CEADS according to IEC 62 ...