Shunt Capacitor Switching EMI Voltages, Their Reduction in Bonneville Power Administration Substations

Back to back switching of grounded Wye shunt capacitors cause high frequency, high magnitude current flow in overhead bus and ground mat conductors. Measurements of induced voltages on control cables and receptacles, transverse voltages on fuse blown PT secondaries and personnel intercept voltages are reported. BPA methods of confining transients to capacitor areas and shielding techniques are reviewed.