What is BS IEC 60076-21-Standard requirements, terminology, and test code for step-voltage regulators about?

BS IEC 60076-21 is a standard that serves standard requirements, terminology, and test code for step-voltage regulators, enabling the regulation and reduction of voltage volatility.

BS IEC 60076-21 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, 1000 kVA (single-phase units) or 3000 kVA (three-phase units) and smaller, 34500 volts and below (2400 V minimum) and their associated controls.

BS IEC 60076-21 provides requirements, references, and definitions relevant to either IEC or IEEE contexts and their use is described in Clause 4.

Who is BS IEC 60076-21-Standard requirements, terminology, and test code for step-voltage regulators for?

BS IEC 60076-21 on standard requirements, terminology, and test code for step-voltage regulators applies to:

Manufacturers of step-voltage regulators
Dealers and importers of step-voltage regulators
Testing houses and labs for step-voltage regulators
Safety assurance services

Why should you use BS IEC 60076-21-Standard requirements, terminology, and test code for step-voltage regulators?

Step voltage regulators are regulators in which the current supply is regulated by switches. They're mostly used to enhance voltage on long feeds with a slow load change over several minutes or hours.

BS IEC 60076-21 provides you guidance on service conditions, rating data, construction, other requirements, test code, component test and universal interface that enables higher load ratings and high tolerance to system faults and overload.

BS IEC 60076-21 provides you guidance on test code including resistance measurements, polarity test, ratio test, no-load loss, excitation current, load loss and impedance voltage, dielectric tests, control system routine tests and more that ensures the safety and operability of step-voltage regulators.

Guidance in BS IEC 60076-21 enables you to standardize requirements, terminology and test code for step-voltage regulators enabling reduction of voltage volatility and high tolerance to frequency deviations.

What’s changed since the last update?

BS IEC 60076-21:2018 supersedes BS IEC 60076‑21:2011, which is now withdrawn.

Changes in BS IEC 60076-21:2018 include -

Inclusion of tables for optional fan-cooled ratings, external dielectric clearances and sound pressure levels
Revision of short-circuit requirements for the distribution and substation voltage regulators
Inclusion of a universal interface between control enclosure and apparatus
Inclusion of tap-changer routine and type tests
Inclusion of audible sound pressure emissions test procedures

BS IEC 60076-21:2018

Power transformers - Standard requirements, terminology, and test code for step-voltage regulators

Current, Under Review

Published:

31 Dec 2018