一种超/特高压分相投切型并联电抗器及其档位调节方法

Super/extra-high voltage split-phase switching shunt reactor and gear adjusting method thereof

Abstract

本发明涉及一种电力系统超/特高压技术,具体涉及一种中性点小电抗可调的超/特高压分相投切型并联电抗器及其档位调节方法。超/特高压分相投切型并联电抗器包括A、B、C三相绕组,A、B、C三相开关和中性点小电抗;A相绕组与A相开关、B相绕组与B相开关以及C相绕组与C相开关分别串联后A、B、C三相绕组星型连接,星型连接后的输电线路中性点通过中性点小电抗器接地;中性点小电抗器包括N个抽头,其电抗数值分档位可调节。本发明解决在不换位超/特高压输电线路上装设对称高抗时可能导致单相自动重合闸失败、线路接地开关选型困难等技术问题,从而有效提高单相自动重合闸成功率,有利于选择同塔双回或并行单回架设线路的接地开关。
The invention relates to a super/extra-high voltage technology of a power system, and particularly relates to a super/extra-high voltage split-phase switching shunt reactor with an adjustable small reactor of a neutral point and a gear adjusting method thereof. The super/extra-high voltage split-phase switching shunt reactor comprises an A-phase winding, a B-phase winding, a C-phase winding, an A-phase switch, a B-phase switch, a C-phase switch, and a small reactor of a neutral point, wherein the A-phase winding, the B-phase winding and the C-phase winding are connected in a star form after being respectively connected with the A-phase switch, the B-phase switch and the C-phase switch in series; the neutral point of an electric transmission line after connection in the star form is grounded through the small reactor of the neutral point; the small reactor of the neutral point comprises N taps; the reactance values can be adjusted by gears. By adopting the super/extra-high voltage split-phase switching shunt reactor and the gear adjusting method thereof, the technical problems that a single-phase automatic reclosing probably fails, selection of a model of a line earthing switch is difficult and the like caused when symmetric high reactors are arranged on an un-shifting super/extra-high voltage transmission line are solved. Thus, the single-phase automatic reclosing success rate is effectively improved, and selection of the earthing switch of a common-tower double-loop or parallel single-loop construction line is facilitated.

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