151. Electronic Tap Changer for Very High-Power Medium-Voltage Lines With No Series-Parallel Thyristors.
- Author
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Fernandez, Santiago Monteso, Garcia, Salvador Martinez, Olay, Carlos Cagigal, Campo Rodriguez, Juan Carlos, Garcia, Ruben Vela, and Lopez, Joaquin Vaquero
- Subjects
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ELECTRIC network topology , *TAP changing (Electric transformers) , *THYRISTORS , *ELECTROMECHANICAL devices , *ELECTRIC potential - Abstract
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 thyristor-based versions. Among the methods to limit the short-circuiting current in commutating taps, the multiwinding coil has demonstrated, during decades of use in the low-voltage 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. [ABSTRACT FROM PUBLISHER]
- Published
- 2018
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