Title: Zigzag transformer - some new applications with a note to energy efficiency

Authors: Kartik P. Basu; Naeem M. Hanoon

Addresses: Faculty of Engineering, Multimedia University, 63100 Cyberjaya, Malaysia ' Faculty of Engineering, Multimedia University, 63100 Cyberjaya, Malaysia

Abstract: Zigzag transformer is only used as a grounding transformer in a three-phase delta connected power supply system. Equal DC current flowing through the windings of a zigzag transformer does not produce any core saturation and it may be used as an interfacing device for AC supply with DC in a power system. This property of the transformer may be used to transmit DC and AC power simultaneously through the same transmission line. It may also be used to get three-phase voltage from three-wire, two-phase supply and may be used to maintain three-phase load voltage when any one phase of the three-phase supply line trips. This paper emphasises the role of zigzag transformer as a common interfacing device in all these new applications with some comments on the change of energy efficiency of the power system.

Keywords: zigzag transformers; EHV transmission lines; HVDC transmission; voltage sag; short-term power interruption; STPI; single-pole auto reclosing; SPAR; energy efficiency; interfacing device.

DOI: 10.1504/IJPEC.2015.070473

International Journal of Power and Energy Conversion, 2015 Vol.6 No.3, pp.267 - 280

Received: 18 Jun 2014
Accepted: 08 Oct 2014
Published online: 07 Jul 2015 *

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