A system comprising: a rotary transformer; a power inverter system; and a device for isolating one or more outputs of the power inverter system from a primary winding of the rotary transformer adapted to couple power between at least one stationary element and at least one rotational element, wherein the power inverter system is configured to provide input power to the primary winding of the rotary transformer, the device further comprising: multiple summing isolation transformers configured to receive a sum of the one or more outputs of the power inverter system and to drive the primary winding of the rotary transformer, wherein each summing isolation transformer (103, 303) includes: a primary winding, wherein the primary winding is connected to the one or more outputs of the power inverter system; a secondary winding, wherein the secondary winding is configured to drive the primary winding of the rotary transformer; a primary shield, wherein during operation the primary shield is operative to provide a return path for primary parasitic capacitance to a main power input connected to the power inverter system; and a secondary shield provided on the secondary winding, wherein the secondary shield is coupled to ground and operative to remove a frequency present on the primary shield. a rotary transformer; a power inverter system; and a device for isolating one or more outputs of the power inverter system from a primary winding of the rotary transformer adapted to couple power between at least one stationary element and at least one rotational element, wherein the power inverter system is configured to provide input power to the primary winding of the rotary transformer, the device further comprising: multiple summing isolation transformers configured to receive a sum of the one or more outputs of the power inverter system and to drive the primary winding of the rotary transformer, wherein each summing isolation transformer (103, 303) includes: a primary winding, wherein the primary winding is connected to the one or more outputs of the power inverter system; a secondary winding, wherein the secondary winding is configured to drive the primary winding of the rotary transformer; a primary shield, wherein during operation the primary shield is operative to provide a return path for primary parasitic capacitance to a main power input connected to the power inverter system; and a secondary shield provided on the secondary winding, wherein the secondary shield is coupled to ground and operative to remove a frequency present on the primary shield. multiple summing isolation transformers configured to receive a sum of the one or more outputs of the power inverter system and to drive the primary winding of the rotary transformer, wherein each summing isolation transformer (103, 303) includes: a primary winding, wherein the primary winding is connected to the one or more outputs of the power inverter system; a secondary winding, wherein the secondary winding is configured to drive the primary winding of the rotary transformer; a primary shield, wherein during operation the primary shield is operative to provide a return path for primary parasitic capacitance to a main power input connected to the power inverter system; and a secondary shield provided on the secondary winding, wherein the secondary shield is coupled to ground and operative to remove a frequency present on the primary shield. a primary winding, wherein the primary winding is connected to the one or more outputs of the power inverter system; a secondary winding, wherein the secondary winding is configured to drive the primary winding of the rotary transformer; a primary shield, wherein during operation the primary shield is operative to provide a return path for primary parasitic capacitance to a main power input connected to the power inverter system; and a secondary shield provided on the secondary winding, wherein the secondary shield is coupled to ground and operative to remove a frequency present on the primary shield.