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Single-phase autoreclosure of extra-high-voltage transmission lines. An investigation into the residual fault current and recovery voltage

Single-phase autoreclosure of extra-high-voltage transmission lines. An investigation into the residual fault current and recovery voltage

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The success of single-phase autoreclosure of extra-high-voltage transmission lines is based on the possibility of self extinction of the secondary arc, in spite of the influence of the sound phases. The residual fault current and the recovery voltage of the switched phase are among the most essential factors affecting self extinction of the residual fault.In this paper, a method is developed for the calculation of the recovery voltage and residual fault current during single-pole switching. The power system investigated consists of a remote power station interconnected to a large electrical system, through a single-circuit extra-high-voltage transmission line. The analysis includes the effect of fault location, line length, station parameters, transmission-line loading and the electromechanical swing subsequent to fault occurrence. The effects of the above factors on recovery voltage and residual current are investigated on the basis of numerical computations for a 500 kV transmission system.

Inspec keywords: fault currents; transmission network calculations; switchgear; power system interconnection; switching systems; short-circuit currents

Subjects: Power system management, operation and economics; Network and transmission line calculations; Switchgear

References

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