Trend adjusted lifetime monitoring of underground power cable

•This paper presents a method for realistic lifetime monitoring of power cable.•The estimations are carried out using trend-adjusted exponential smoothing.•The methodology is sensitive to changes in LOL trend annually.•The loading condition is the main factor to determine the lifespan.

Insulated power cables are the most critical devices used in electrical network for urban areas. Also, lifespan knowledge of these devices is the important information for decision-makers to make their investment planning. This study has presented a practical method for estimating the remaining lifetime of a power cable. The validation of the method has been tested under two different cases for 154 kV XLPE insulated underground power cable system. Power cable thermal network has been modeled for a short-duration transient according to electrical analogy. Lifetime monitoring has been carried out by considering loss of life trend depending on the load raising an annual basis. The results show that the accuracy of the remaining service life estimation is related to receiving data with high sample-rate and determining loss of life trend curve belonging to the power cable. The realistic estimations are carried out using trend-adjusted exponential smoothing.