| 摘要 |
<p>PROBLEM TO BE SOLVED: To precisely estimate a conductor temperature in the maximum temperature part of a line when a cross section to be analyzed has a complicated shape or consists of parts made of different materials or when a load current is suddenly changed. SOLUTION: In a method for estimating a conductor temperature of an electric power cable line by means of a limited element heat analysis model, a temperature inside a hollow tube line and a line load current pattern are measured, while an unknown heat constant is varied as a parameter, and an optimum parameter is selected for calculating a temperature distribution of the line so that a temperature distribution most similar to that of an actually measured line is given. Consequently, the conductor temperature in the maximum temperature part is estimated.</p> |
