Electronic Tap Changer for Very High-Power Medium-Voltage Lines With No Series–Parallel Thyristors
Fecha
2018-06
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IEEE
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Tap changers are commonly used to maintain
the limits in medium-voltage lines. Initially based on
electromechanical switches, efforts have been made since
the 1990’s to reduce maintenance expenses with thyristorbased
versions. Among the methods to limit the shortcircuiting
current in commutating taps, the multiwinding
coil has demonstrated, during decades of use in the lowvoltage
field, to be reliable and cheap. Two previous papers
showed that multiwinding changers can be applied to
medium-voltage lines up to 34.5 kV, 15 MVA with no parallel
or series thyristor association. This paper proposes a new
topology, based on a double array of tap switches per phase,
allowing for step-up the power from 15 to 36 MVA and insertion
in any point of the line with no connection to the head
transformer. A comparative cost analysis gives technical
and economical results for a typical 10 MVA, 34.5 kV stabilizer
demonstrating the advantages of the proposed circuit
over the electronic single array topology and the classic
mechanical solutions.
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S. M. Fernández, S. M. García, C. C. Olay, J. C. Campo Rodríguez, R. V. García and J. V. López, "Electronic Tap Changer for Very High-Power Medium-Voltage Lines With No Series–Parallel Thyristors," in IEEE Transactions on Industrial Electronics, vol. 65, no. 7, pp. 5237-5249, July 2018, doi: 10.1109/TIE.2017.2777380.