Abstract
The paper is concerned with the main aspects of the two-phase automatic reclosing in transposed extra-high voltage lines equipped with four-radial shunt reactors. In 500-1150 kV lines, the overwhelming proportion of blackouts is caused by single-phase short circuits, many of which, being unstable arc accidents are conveniently eliminated in a single-phase automatic reclosing cycle. However, a considerable share (approximately 5–10%) is made up of double-phase short-circuits, for the elimination of these, a high-speed three-phase automatic reclosing is usually used. It is of great interest to analyze the efficiency of using double-phase automatic reclosing to eliminate double-phase short circuits. It was shown that complying presentation of the real transpose line is necessary to determine the transient recovery voltage and secondary arc current at two-phase automatic reclosing pause. In 500 km lines with equipped with three shunt reactors, a method was proposed to decrease the secondary arc current and transient recovery voltage using capacitor batteries, which are connected in series with the shunt reactor during the two-phase automatic reclosing pause.
Keywords
Extra-high voltage line, transposed line, four-radial shunt reactors, two-phase automatic reclosing, transient recovery voltage, secondary arc current, dead time.
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