STANDARDIZATION OF INSULATION FOR HIGH-VOLTAGE UNDERGROUND POWER-LINES

On the basis of an analysis of lightning overvoltages in the circuit o f an overhead line and high-voltage underground line, it is shown that , when installing non-linear limiters at the beginning and end of a 10 0-500 kV underground transmission line, the dimensions of the insulati on of such a line of various designs (oil-filled cables, polyethylene- insulated cables, gas-insulated lines) can be chosen only on the basis of ensuring an acceptable operating electrical field intensity. (C) 1 997 Elsevier Science Ltd. All rights reserved.