Real-Time Ampacity Model for Overhead Lines

Abstract

A thermal model is formulated that has the capability of predicting the temperature of overhead transmission lines. The thermal model is formulated into a computer program that can calculate both steady-state tate and transient temperatures of a conductor. The transient portion of the program allows the simulation of "real-time" line operation and provides a method to predict instantaneous conductor temperatures. In addition to predicting the temperature and ultimate sag of the line, the program can be used to predict the operating conditions of lines in the design stage. The program is also useful for designing new transmission spans, and for predicting contingency ratings during emergency conditions.