The allowable current of an underground power cable system is evaluated based an the temperature rise of a conductor. Generally the steady allowable current is evaluated based on saturated temperature rise, and the short-time allowable current is evaluated bared on transient beat Conduction only in one cable with approximate time constants. There is a relatively large tolerance. Therefore, an evaluation system for transient temperature rise of power cables in 1) protection pipe with actual transient load change is strongly required. I t i s effective i f temperature rises o f a protection pipe and a conductor in a cable are calculated individually and then subsequentlyadded because heat capacity of soil is very large and that of the cable itself i s relatively small. In this study calculation programs for a protection pipe and cable are developed and with these programs the evaluation system f o r underground power cable temperature is proposed. With this system, tolerance of the conventional method is evaluated and validity of this system i s presented.
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