An Advanced Retard Switch (referred: ARS) is used to reverse the polarity of a winding during transformer operation.
The COMTAP® ARS has two basic operating positions. With an ARS application the through-current of a current path is commutated to another current path of the same potential. The contact system is equipped with special contacts for this purpose.
The COMTAP® ARS can be used for different applications in combination with an on-load tap-changer. The ARS is primarily used to reverse the polarity of the regulating voltage (double reversing change-over selector function) for applications with wide regulating ranges such as phase shifter transformers, for example.