Abstract: A substation (100) is disclosed for use in a power transmission and distribution network. The substation comprises a single phase isolating high frequency transformer (101) having at least one input winding (112, 113) and at least one output winding (114-117) with corresponding input (104) and output (105) solid state switching networks. Each input solid state switching network (104) comprises a plurality of semiconductor switching devices which receive an input waveform from the transmission network and output a high frequency waveform to the primary winding of the transformer. Likewise, each output solid state switching network (105a-105d) comprises a plurality of semiconductor switching devices receiving a high frequency waveform from the secondary winding (114-117) of the transformer and outputting an output frequency waveform from the substation.