BS EN 62271-212:2022 - Page 2

High-voltage switchgear and controlgear. Compact Equipment Assembly for Distribution Substation (CEADS) for AC voltages up to 52 kV | Status: Current

1 Scope This part of IEC 62271 specifies the service conditions, rated characteristics, general structural requirements and test methods of the assemblies of the main electrical functional units of a high-voltage transformer substation, duly interconnected, for AC voltages up to and including 52 kV on the high-voltage side and service frequency 50 Hz or 60 Hz. The CEADS is cable-connected to the high-voltage network for indoor and outdoor applications of restricted access. A CEADS as defined in this document is designed and tested to be a single product with a single serial number and one set of documentation. The functions of a CEADS are:

• — high-voltage/high-voltage or high-voltage/low-voltage transformation;

and some or all the following:

• — switching and control for the operation of the high-voltage circuit(s);
• — switching and control for the operation of the low-voltage circuit(s);
• — protection of the power transformer functional unit.

The main functions are integrated in the following functional units:

• — high-voltage functional unit;
• — power transformer functional unit;
• — low-voltage functional unit.

NOTE For the purpose of this document a self-protected transformer is not considered as a CEADS, but as a functional unit, designed and type tested to its own product standard IEC 60076‑13:2006.