IEC 60076-24:2020 pdf free

IEC 60076-24:2020 pdf free.POWER TRANSFORMERS – Part 24: Specification of voltage regulating distribution transformers (VRDT).
This document applies to medium power transformers from 25 kVA up to 3 150 kVA with highest voltage for equipment up to 36 kV, or in low voltage (LV) networks with highest voltage for equipment of up to 1,1 kV equipped with voltage regulating devices.
Voltage regulating distribution transformers are transformers equipped with components to control primary or secondary voltage for on-load voltage regulation purposes.
The main objective of the installation of a VRDT is to regulate the LV network voltage level (i.e. 400 V), to avoid violation of the limits defined by relevant standards or regulations. The VRDT must operate properly as a step down and step up transformer.
Transformers covered by this document comply with the relevant requirements set out in
IEC 60076 (all parts) and, unless otherwise stated in this document, they also comply with
European Standards EN 50160 and EN 50588-1.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (Including any amendments) applies.
IEC 60068-2-1, Environmental testing — Part 2-1: Tests — Test A: Cold
IEC 60068-2-2, Environmental testing — Part 2-2: Tests — Test B: Dry heat
IEC 60068-2-11, Basic environmental testing procedures— Part 2-11: Tests— TestKa: Salt mist
IEC 60068-2-30. Environmental testing — Part 2-30: Tests — Test Ob: Damp heat, cyclic (12 h + 12 h cycle)
IEC 60068-2-78, Environmental testing — Part 2-78: Tests — Test Cab: Damp heat, steady state
IEC 60076-1, Power transformers — Part 1: General
IEC 60076-2, Power transformers — Part 2: Temperature rise for liquid-immersed transformers
IEC 60076-5, Power transformers — Part 5: Ability to withstand short circuit
IEC 60076-7, Power transformers — Part 7: Loading guide for mineral-oil-immersed power transformers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60076-1, EN 50708, and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http:/Iwww.iso.org/obp
3.1 voltage regulating distribution transformer VRDT transformer equipped with components to control primary or secondary voltage for on-load voltage regulation purposes within the scope of this document
3.2 regulation voltage ratio Ud/UN or 100 Ud/UN (percentage) where: UN is the rated voltage of the transformer; Ud is the voltage which would be developed at no-load at the terminals of the transformer, connected on the tapping concerned, by applying rated voltage to an untapped winding related to IEC 60214
3.3 regulation range variation range of the regulation voltage expressed as a percentage, compared with value N lOOK.IEC 60076-24 pdf download.