The invention discloses a
phase selection switch controller which comprises an upper
machine communication module, a main control module, a
signal processing and collecting module, a charging and discharging control module of an energy storing
capacitor and a safety
interlocking module. The main control module is mainly composed of a DSP
system, an external RAM and a man-
machine interface. The
signal processing and collecting module is composed of an
analog signal conditioning unit, a
logic control unit and a digit collecting unit. The charging and discharging control module of the energy storing
capacitor is composed of an AC / DC high-frequency switch power supply, a discharging and energy storing
capacitor C, a protective
diode and a photoelectric coupler. The
phase selection switch controller has the advantages that during closing and opening of the capacitor, inrush currents are reduced,
overvoltage is hindered, a series reactor is not needed, the overhauling period and the service life of a high-
voltage switch are prolonged, re-ignition and re-strike are prevented and the insulating level of equipment is lowered. When fault currents are
cut off, the
cut-off capability is improved, abrasion of the switch is reduced, stability of the
system is improved and the service life of the switch is prolonged.