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:
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— high-voltage/high-voltage or high-voltage/low-voltage transformation;
and some or all the following:
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— switching and control for the operation of the high-voltage circuit(s);
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— switching and control for the operation of the low-voltage circuit(s);
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— protection of the power transformer functional unit.
The main functions are integrated in the following functional units:
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— high-voltage functional unit;
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— power transformer functional unit;
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— 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.