Publication: Study on the effect of ampacity for medium voltage underground cables using horizontal direct drilling method in distribution division, Tenaga Nasional Berhad
Date
2025-06-05
Authors
Masliza Binti Md. Noah
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Underground distribution cable is a vital part of TNB Distribution system in delivering the required power. Selecting the most suitable cable installation method is important and it has become more difficult nowadays due to the stringent requirement imposed by the passage caretaker. TNB Distribution will have to deliberately consider both requirements from TNB and the passage caretaker. This study analyzed laying cable in ducts which are best known as installation cable using Horizontal Direct Drilling (HDD) method which is widely imposed by local authorities in Malaysia. HDD also was known as the expensive way of cable installation method even though contributing less harm to the aesthetic value of the road. The independent variables of the research consist of three major criteria that influence the cable ampacity when laid in ducts, which are the depth effect of HDD pipes, the formation of the HDD pipes and the sizes of the HDD duct or pipe. The research used a multi-model approach where the effect of the independent variables on the dependent variable, which is the method of HDD cable installation were evaluated by a developed matrix model. The technical effect of the various cable installation method was examined using CYMCAP Simulation Software program which used IEC 287 to calculate medium voltage underground ampacity worldwide. The simulated data was used to analyze the effect of the ampacity and also to determine the optimum ampacity for the MVUG cables installed using HDD method. The study found that in order to achieve the optimum ampacity of the laid cable using HDD installation method, it is best to maintain the six inches pipe size but with minimum one meter spacing between the pipes. And for single core cable, it is recommended to lay one cable per core per pipe in order to achieve the optimum ampacity of the said cable.
Description
TK3001.M37 2016