Fast three-phase reclosing method in shunt reactor compensated transmission lines

摘要

The present invention describes a method for controlling overvoltages when reclosing shunt reactor compensated transmission lines. After the circuit breaker opens a transmission line, the interaction between the transverse admittance of the line and the inductance of the compensation shunt reactor causes the voltage between the poles of the circuit-breaker to oscillate (pulse). The best point to reclose the circuit breaker corresponds to the region where the voltage pulse amplitude between the circuit breaker poles is the lowest. The disclosed method determines with greater reliability the first minimum pulse region, irrespective of the zero crossing of the voltage wave. This method also affords a greater time margin to operate the circuit breaker, since detection of the best reclosing region occurs several fundamental frequency cycles in advance. When incorporated into the logic control unit of a digital relay for the three-phase reclosing of transmission lines, this method creates a new digital relay for adaptive three-phase reclosing of transmission lines with shunt reactor compensation.