Device and Operating Principles

This device adopts the high-voltage large-power thyristors as the switch device to meet different voltage levels by thyristors in series or/and parallel form. By controlling the switch of thyristors, it can avoid the sudden change of terminal voltage of capacitor when the capacitor occurs conduction moment, and the capacitor array can be switched on safely; it is naturally turned off with zero current when turning off the capacitor, and the capacitor array can be switched off safely.

 

Performance

   No inrush current, no operating over-voltage when capacitor array is switched-on.

   No reignition over-voltage when capacitor array is switched-off.

   The capacitor array can be on-off switched frequently, the residue voltage of capacitor array has no effect on operating.

   On some occasions, an alternative is to work with vacuum contactor in parallel-circuit, During the transient processes, the thyristor works , and the vacuum contactor works during the steady-state. In this way, the heat loss of thyristor is avoided.

   The capacitor array can work in single-phase (individually); The capacitor array must be connected in star-form when works in tri-phase (three-phase).

   Several devices can be connected to form a network, to adjust reactive power(factor) automatically and dynamically.

Applications

   6kV、10kV、35kV tri-phase, Y-connected capacitor: such as in electric network power substation, chemical plant , metallurgical industry, steel rolling mill and mining , in which the reactive power(factor) must be controlled .

   27.5kV single-phase, single- Y connected capacitor: such as in the traction substation in the electrified railway system in which the reactive power(factor)must be adjusted automatically and dynamically.

       Note: The voltage level can be adjusted based on customer’s requirement.