BS EN IEC 62271-202:2022

1   Scope

  This part of [IEC 62271](/search?q=IEC%C2%A062271)
   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: 

   
      
         

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