Methods to improve transient performance of CVTs: analysis and recommendations

Abstract

Transients in capacitive voltage transformers (CVTs) are known to cause measurement problems in the relays. These switching transients can take several cycles to die out if the burden imposed by the secondary connected devices is a fraction of the CVT rated burden. In this paper, the transient response of the CVTs connected to low burden numerical relays is studied in detail and than the methods to improve the same are discussed. The methods discussed vary from simple modifications in existing CVT design to some major changes in the CVT construction. The paper gives a comprehensive coverage of design issues for CVTs intended to be used with numerical relays. Copyright © 2010 John Wiley & Sons, Ltd.