Ice-melting practices on transmission lines

THE SHORT-CIRCUIT and phase-shift methods for removal of ice formation from approximately 95 per cent of its 3,200 miles of 33-, 66-, and 132-kv transmission lines are being used by Public Service Company of Northern Illinois, Wheaton. These methods are used when the severity and extent of ice storms in the company´s 11,000 square miles of territory make ice prevention measures through additional line loadings and current circulation in transmission-line loops not wholly effective.