UNE-EN IEC 62271-202:2023

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 highest

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 standard:

" high-voltage switching prefabricated substations;

" high-voltage/low-voltage transformer prefabricated substations (step-up and step-down).

A high-voltage switching 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 transformers;

" high-voltage and low-voltage switchgear and controlgear;

" high-voltage and low-voltage interconnections;

" auxiliary equipment and circuits.

However, relevant provisions of this standard 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 62271-212.

This standard covers only designs using natural ventilation. However, relevant provisions of

this standard are applicable to designs using other means of ventilation except the rated power

of the prefabricated substation and associated class of enclosure (see 5.101), the continuous

current tests (see 7.5) and all temperature rise related requirements, which would require an

agreement between manufacturer and user.

NOTE IEC 61936-1 [1] provides general rules for the design and erection of high-voltage power installations. As

well, it specifies additional requirements for the external connections, erection and operation at the place of

installation of high-voltage prefabricated substations compliant with IEC 62271-202, which are regarded as a