ANALYSIS AND DATA PROCESSING SYSTEMS

The paper discusses the implementation of a single-phase auto-reclosing (SPAR) using automatic phase shunting in transposed lines. It is proved that to take into account real transposition in the calculation of recovery voltages (RV) and secondary arc currents (SAC) is a prerequisite. On the basis of the algorithm, the conditions for quenching the secondary arc are analyzed for SPAR with the use of APS in 500 kV and 750 kV lines with their lengths of 300 and 500 km. Typically, a transposition of phases consisting of three steps of transposition is used in long lines. When estimating RV and SAC, such lines are usually taken to be perfectly transposed, that is, having the symmetry of phase and interphase parameters. This paper proves that taking into account real transposition in assessing the effectiveness of the use of single-phase auto-reclosing (SPAR) is a prerequisite. In the case of real transposition RV and SAC depend on what phase is SPAR performed. The maximum recovery voltages (RV) and secondary arc currents (SAC) for real transposition exceed the corresponding values by 2.5-7.0 times in the case when the line is represented as ideally transposed. The most unfavorable conditions arise in phases that occupy extreme positions at the middle step of transposition. The SPAR application gives the greatest effect if the pause duration is 0,5-1,0 sec, which requires limiting the secondary arc current to 20-45 A (an amplitude value). With a pause of more than 1.5-2.0 sec its duration does not significantly affect the throughput by condition of dynamic stability.

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