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Zero-current zero-voltage switching for on-load tap-changers

Rogers, Daniel J. and Green, Tim C. 2010. Zero-current zero-voltage switching for on-load tap-changers. Presented at: Power Electronics, Machines and Drives (PEMD), Brighton, UK, 19-21 April 2010. 5th IET Conference on Power Electronics, Machines and Drives. IEEE, 10.1049/cp.2010.0039

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We present a new on-load tap changer (OLTC) design that provides the traditional advantages of the semiconductor-assisted OLTC over the classic, mechanical OLTC. The design provides zero-current, zero-voltage operation of both diverter switches at all times, eliminating contact wear due to arcing. The design of the diverter sub-circuit is discussed, including the introduction of a voltage source and corresponding control loop that provides the necessary shunt current or voltage to create the desired zero conditions in the diverter switches. The design differs from existing semiconductor-assisted OLTC systems by the fact that the semiconductor portion of the system is connected in a purely shunt configuration to the main current path. Under normal conditions the load current flows only in the selector and diverter switches making the system very low loss.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Uncontrolled Keywords: contact arcing ; mechanical switching ; on-load tap changer ; power electronics
Publisher: IEEE
Last Modified: 12 Oct 2016 02:35

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