Power transformers – Part 21: Standard requirements, terminology, and test code for step-voltage regulators
|Publication Date:||1 December 2018|
|ICS Code (Transformers. Reactors):||29.180|
This document describes electrical, mechanical and test requirements of liquid-immersed, single- and three-phase, 50 Hz and 60 Hz, self and forced-air cooled, distribution, overhead and substation, step-voltage regulators, 1 000 kVA (single-phase units) or 3 000 kVA (threephase units) and smaller, 34 500 volts and below (2 400 V minimum) and their associated controls.
Requirements, references and definitions relevant to either IEC or IEEE contexts are given and their use is described in Clause 4.