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Voltage distribution in multi‐cascaded transformer
Author(s) -
Nakajima Tatsuhito,
Suzuki Hirokazu,
Matsuo Takahide,
Saito Sadamu,
Inagaki Keizo
Publication year - 1998
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/(sici)1520-6416(19980115)122:1<17::aid-eej3>3.0.co;2-v
Subject(s) - distribution transformer , transformer , voltage , electrical engineering , cascade , electromagnetic coil , delta wye transformer , engineering , chemical engineering
The voltage distribution for lightning surges in multicascaded transformers that will be used for converter transformers in self‐excited dc transmission was studied using model transformers. There was good agreement between measured data and calculated results. It was shown that our calculation program has sufficient accuracy for estimating voltage distribution. Maximum voltages in high‐voltage windings for lightning surges were below 120% and transfer voltages to the converting circuit were below about 5%. Therefore, there were no serious problems in cascaded transformers for lightning surges. However, their voltage distribution was not satisfactory when the same transformers were connected in cascade. We determined by a simulation that the distribution could be improved by modifying transformer structures according to their position in the cascade connection. © 1998 Scripta Technica. Electr Eng Jpn, 122(1): 17–24, 1998