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

Abstract

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.

Description

technical field [0001] The invention relates to an ultra / ultra-high voltage technology of a power system, in particular to an ultra / ultra-high voltage split-phase switching shunt reactor and a gear adjustment method thereof. Background technique [0002] In the EHV / UHV power grid, three-phase shunt reactors (hereinafter referred to as symmetrical high reactance) with symmetrical and equal capacity are installed on the transmission line to compensate the large amount of capacitive power generated by the transmission line and suppress the power frequency overshoot of the system. Voltage. [0003] For non-transposed EH / UHV transmission lines, due to the high voltage level of transmission lines and the unbalanced capacitance and inductance parameters of three-phase lines, when installing symmetrical high-resistance on non-transposed EH / UHV transmission lines , will lead to a high level of submerged supply current and recovery voltage gradient when a single-phase ground fault oc...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the object of the present invention is to provide a super / ultra-high voltage split-phase switching shunt reactor and its gear adjustment method. The invention solves the problem of installing symmetrical high Anti-time may lead to technical problems such as single-phase automatic reclosing failure and difficult selection of line grounding switches, thereby effectively improving the success rate of single-phase automatic reclosing, which is conducive to the selection of grounding switches for double-circuit or parallel single-circuit erected lines on the same tower

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