Interference limiting enclosure for power flow devices

A method for reducing electrical interference in a power flow control device connected to a high voltage transmission line, the method comprising:

• providing a sealed enclosure around the power flow control device wherein a plurality of panels, formed of metal, are attached together with conductive gaskets therebetween;
• providing a shorting connection between each pair of the plurality of panels;
• providing an electrical connection between at least one of the plurality of panels and the high voltage transmission line;
• providing a receiving region on each panel for each shorting connection;
• and
• providing an equipotential assembly that floats at a potential of the high voltage transmission line, wherein the equipotential assembly comprises the sealed enclosure, whereby electromagnetic interference is reduced from the high voltage transmission line to internal components of the power flow control device, and from the internal components of the power flow control device to the high voltage transmission line.