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Vol. 105, Issue 6, June 2009, pp.56-65





Study of a Modified Design of a Potential Transformer


S. C. BERA and D. N. KOLE

Instrumentation Engineering Section, Department of Applied Physics,

University of Calcutta, 92, A. P. C. Road, Kolkata 700 009, W. B., India

E-mail: scb152@indiatimes.com, dnkoley@yahoo.com



Received: 18 February 2009   /Accepted: 22 June 2009   /Published: 30 June 2009


Abstract: The conventional potential transformers suffer from ratio error and phase angle error, due to the effects of secondary current, magnetizing current and eddy current. In the present paper attempts have been made to reduce these currents by modifying the conventional design of a potential transformer using feedback technique. A low voltage prototype of this modified potential transformer has been fabricated and its performance characteristics have been experimentally studied in storage oscilloscope. The experimental results are reported in this paper. From these results a very good linear response with negligible phase angle error has been observed.


Keywords: Potential transformer, Ratio error, Phase angle error and Feedback technique


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