Modelling and optimisation of design of non-conventional instrument transformers

Bojan Nikolić,Sanowar Khan

doi:10.1088/1742-6596/1379/1/012057

Abstract

In this paper, we have proposed, modelled and optimised several designs of non-conventional instrument transformer (NCIT) for high voltage overhead transmission lines (400kV). We have discussed several parameters and investigated how they influence the sensitivity of our NCIT, consisting of magnetic shape memory (MSM) element, magnetic circuit and an LVDT (linear variable differential transformer). One of the most used conductors in these lines, 528-Al1/69-ST1A ACSR conductor (old code MOOSE), was modelled together with the MSM element and the magnetic circuit in ANSYS APDL. Based on the obtained results we have given suggestions on how NCIT could be designed taking into account a choice of the most appropriate material for this application. The way how the model was developed was presented as well as calculations of errors in the model in ANSYS APDL for electromagnetic problems.

Highlights

One of the main reasons that a need for so-called non-conventional instrument transformers (NCIT) has arisen recently is incompatibility of conventional instrument transformers with modern measurement equipment
The magnetic circuit geometry should be carefully chosen as it affects its saturation, nonconventional instrument transformer (NCIT)’s sensitivity to high temperatures of the conductor and, possibility to trigger the magnetic shape memory (MSM) element
In this paper, we have analysed parameters that affect the sensitivity of the proposed NCIT designs in order to optimise its magnetic circuit geometry for high voltage overhead transmission lines (400kV)

Summary

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Introduction

Published under licence by IOP Publishing Ltd

Shape of w t r

Conclusions