APPLICATION OF AUTOMATIC PHASE SHUNTING FOR SUPPRESSION OF THE SECONDARY ARC IN PAUSE PAIRS OF EXTRA HIGH VOLTAGE TRANSMISSION LINES

Authors

DOI:

https://doi.org/10.20535/1813-5420.1.2019.182478

Keywords:

single-phase automatic reclose, automatic phase shunting, secondary arc, shunt reactor, compensation reactor

Abstract

One of the main causes of equipment failure in the main electrical network is a overvoltage, that is, increase the value of the operating voltage above the maximum value according to the technical requirements. This is because the relatively small insulation reserve provides for the components of the electricity grid because of its high cost for a given voltage. Generally, cost of power systems insulation is a significant factor in capital expenditures. Internal overvoltage appears through resonance, due to coincidence of the parameters of the circle. In order to increase the reliability and efficiency of extra-high voltage power lines, a single-phase automatic reclose is applied when a single-phase short circuit occurs. During the operation cycle of a single-phase automatic reclose, a secondary arc arises, which receives supplying from the capacitive connections of the unconnected phases of the line. In turn, the success of a single-phase reclosing cycle depends on the characteristics of the secondary arc. The aim of the article is the development and application of an effective measure of suppressing a secondary arc in the form of automatic shunting of the disconnected phase. To achieve this goal, an approach has been developed to determine the characteristics of the repeated arc of the current of the disconnected phase, based on the matrix method of analysis of power line elements. To assess the degree of influence of automatic phase shunting on the aperiodic component of the charge arc current, the equivalent circuit of the disconnected damaged phase was compared. Based on the developed approaches, the effectiveness of the use of automatic phase shunting to increase the efficiency of operation of extra-high voltage power lines in o-phase operation modes was proved.

References

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Issue

Section

TECHNOLOGIES AND EQUIPMENT IN ENERGY