Abstract
Controlled switching is proven as best mitigation technique for reduction in current transient arises during transformer and capacitor switching. Ideal targets for transformer switching are gap voltage peak without considering residual flux, whereas capacitors are switched at minimum gap voltage. Transformer–capacitor combined topology is adopted in specific conditions based on operational and economical constraints.Such topology presents behavior of transformer and capacitor in the same circuit hence conventional strategies for energization and de-energization are not feasible. This paper evaluates the application of controlled switching for transformer connected with large capacitor bank connected with weak grid. With the application of proposed methodology, the high frequency inrush current has been reduced along with reduction in voltage depression and total harmonic distortion. In this way, application of controlled switching not only reduces inrush transients but also improves the power quality at the point of common connection. The technique has been validated with field tests and simulations and is found quite effective.
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Schedule a callMore From: Journal of The Institution of Engineers (India): Series B
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