Condition Assessment of Underground Cable System Using Fuzzy Logic and Scoring and Weighting Average Methods

In this paper, the overall health index of underground cable system is determined using Fuzzy Logic and Scoring and Weighting Average methods. The relevant data of 73 feeders has been collected in the prepared evaluation forms, divided into five major component groups: cable, joint, termination, manhole, and ductbank. In each component, various testing methods and diagnostic techniques are applied, and then the numerical score is determined according to the technical criteria for condition assessment. Subsequently, the obtained overall health index is multiplied with the conditional factor to incorporate the differences in installation type and configuration as well as the operating and environmental conditions. Finally, the overall health index based on these two methods is compared to verify the accuracy of the obtained results to properly plan the preventive and condition-based maintenance and to improve the reliability of the underground cable system.

I. Introduction

An underground cable system is a form of power transmission laid underground. The conduit is embedded in the ground in a structure that supports the cables and equipment for power transmission. There are several advantages of underground cable systems, whether adding beautiful scenery to the surrounding, helping to strengthen the stability and safety of the electrical system, and reducing the problem of supply interruption from natural disasters and accidents on the ground.