Voltage variation in MV distribution networks and its impact on selection of MV/LV transformation ratio

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Paper number
1025
Working Group Number
Conference name
CIRED 2019
Conference date
3-6 June 2019
Conference location
Madrid, Spain
Peer-reviewed
Yes
Short title
Convener
Authors
Broz, Filip, EGC-EnerGoConsult CB, Czech Republic
Prochazka, Karel, EGC-EnerGoConsult CB, Czech Republic
Kaspirek, Martin, E.ON Distribuce, Czech Republic
Jiricka, Jan, E.ON Distribuce a.s., Czech Republic
Abstract
Regarding the nominal voltage change from 380 V to 400 V in LV networks and increasing the maximum voltage from 400 V to 420 V, the distribution utilities started to take a different approach to the MV/LV transformation ratio of transformers, specifically to change of the secondary nominal voltage to 420 V instead of 400 V. Thus, in newly constructed MV/LV TRs as well as during the retrofit of existing TR, transformers connected to the MV feeders have the output voltage 400 V ±2×2.5% and 420 V ±2×2.5% with off load tap changing (except the OLTC pilots).This paper deals with assessment of suitability of transformation ratios of 22/0.4 kV or 22/0.42 kV under actual voltage conditions.
Table of content
Keywords
Publisher
AIM
Date
2019-06-03
Permanent link to this record
https://cired-repository.org/handle/20.500.12455/247
http://dx.doi.org/10.34890/12
ISSN
2032-9644
ISBN
978-2-9602415-0-1