Switch assembly for use in a power transmission system

A switch assembly for use in a circuit between a first electrical conductor and a second electrical conductor, the circuit being configured to carry a current between the first electrical conductor and the second electrical conductor, the current having a variable frequency, wherein the switch assembly is arranged such that the first electrical conductor and the second electrical conductor can be selectively connected and disconnected such that when the first electrical conductor and the second electrical conductor are disconnected, current therebetween is interrupted and when the first electrical conductor and the second electrical conductor are connected, current is permitted to flow therebetween, the switch assembly comprising:

• at least a first current path and a second current path, wherein each of the first current path and the second current path includes an electrical contact which can be selectively connected to or disconnected from the second electrical conductor so as to permit current flowing between the first electrical conductor and the second electrical conductor to flow via one or both of the first current path and the second current path,
• wherein at least one of the first current path and the second current path is arranged such that it has a frequency-dependent reactance so as to force current with a frequency which complies with a selected frequency criterion and which flows between the first electrical conductor and the second electrical conductor to flow via a selected one of the first current path and the second current path at least to a greater extent than via the other one of the first current path and the second current path.