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An active-shunt diverter for on-load tap changers

Rogers, Daniel J. and Green, Tim C. 2013. An active-shunt diverter for on-load tap changers. IEEE Transactions on Power Delivery 28 (2) , pp. 649-657. 10.1109/TPWRD.2013.2243171

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This paper presents a new hybrid diverter design for on-load tap changers. The design uses “active-shunt” current diversion principles. At its core, the design employs a low-voltage high-current switch-mode amplifier to divert current out of the mechanical contacts and into a pair of anti-parallel thyristors. Commutation between transformer taps may then be performed by the thyristors. The amplifier and thyristors are placed outside the normal load current path and only conduct during a tap change, producing efficiency savings and improving robustness when compared to previous hybrid on-load tap changer implementations. An amplifier control loop that autonomously produces zero-current conditions at switch opening and zero-voltage conditions at switch closure is demonstrated. Experimental results investigating the wear characteristics of contacts operated under the new hybrid diverter are presented, along with comparison results from a passive-type switching scheme. Contact lifetime of more than 25 million operations is demonstrated under the new scheme.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: Arc discharges; closed-loop systems; contacts; power distribution; power electronics; power grids; smart grids; sparks; transformers; voltage control
Publisher: IEEE Power & Energy Society
ISSN: 0885-8977
Funders: EPSRC
Last Modified: 12 Oct 2016 02:45

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