Quality & Quantity (2005) 39:671–685 © Springer 2005
Design Optimization of Current Transformers
Using Robust Design Methodology
M. BAMENI MOGHADAM
and M. AMANI
Department of Statistics, Allameh Tabatabaee Univ., Beheshti – Ghasir Ave., Tehran, Iran;
Abstract. In this paper a cost effective system design of current transformer (100/5 A)
through application of robust design methodology is proposed. The results show that with
better performance, the market price of proposed current transformer can be much less than
half the price of one of the famous current transformer brand in market. These results are
obtained under vast environmental conditions of network frequency and temperature varia-
tions of Iran.
Key words: current transformer, robust design, system design, parameter design.
Two of the most quality issues in current transformers (CTs) is reduction
of output errors in amplitude and phase which are called ratio and phase
errors, respectively. These are errors caused by not exactly reproducing the
primary current (IP) in CTs. This study focuses on robust optimization in
product design of a particular current transformer (100/5 A. CT) in respect
of ratio error quality characteristic (I e).
Since CTs are used for two main purposes in industries, namely,
electrical measuring and system protection, malfunctioning of CTs leads
to incorrect measuring of designed parameters and destruction of electri-
cal equipments in a system. Therefore, minimization of ratio error quality
characteristic in CTs is important from quality and cost point of view.
The product design optimization method used here is application of
Robust Design method in Engineering which is also called Taguchi method
(TM). It appears that there is nothing notable in the published litera-
ture about optimization of product design of CTs using Taguchi Method.
Therefore, the present study seems to be a pioneer work in its own in
respect of using this method in product design optimization of CTs. The
Author for correspondence: Department of Statistics, Allameh Tabatabaee University,
Beheshti – Ghasir Avenue, Tehran, Iran. E-mail: bamenimoghadam @ atu. ac. ir