Study of Characteristics of Fault in Overhead and Underground Cable Distribution System Using Experimental Test Bench

Piladelak Yindeesap,Atthapol Ngaopitakkul,Monthon Leelajindakrairerk

doi:10.12792/icisip2015.065

Abstract

This paper is focused on the behavior of current waveform when the single line to ground fault occurs on the pi-lumped equivalent circuit experimental test bench of distribution system. The experimental test bench can be divided into the distribution system either overhead line or underground cable. The parameter of experimental test bench is calculated based on per-unit method by using the data from the 115 kV distribution system in Thailand. The various case studies are performed by changing the type of distribution system, the location of fault, the inception angle of fault including varying the load. The obtained results show that, during the fault occurrence, the current waveform has a sudden change and increases more than 10 times in comparison with normal condition. Finally, the results from the experimental test bench will be beneficial in the behavioral study of the fault current in case of both overhead line and underground cable and will be development of the short-circuit protection system in the distribution system.

Highlights

Distribution system is one of important parts in power system, which sends electrical energy from utility to end user
By changing the location of fault and not for the inception angle of 180° and size of load is 25 W as shown in Table 6 and Figure 8, it can be seen that, during the postfault condition, the fault current tends to decrease with the increase of the distance between the fault point and variable voltage transformer; this has the same behavior as in the case of overhead line, but the amplitude of the fault current is more than the other case
This paper has focused on the characteristics of the single-line to ground fault current obtained from the experimental test bench

Summary

INTRODUCTION

Distribution system is one of important parts in power system, which sends electrical energy from utility to end user. By considering the literature review about simulation program, this research studies the fault location in transmission line of 3-phase multi-generator system in conjunction with an adaptive neuro-fuzzy inference system (ANFIS) and artificial neural network (ANN) [1]. The simulation program such as PSS/E, EMTP-ATP and PSCAD/EMTDC are used to study the power system with mathematical model. By considering the literature review about mathematical model, fuzzy and neural network are interesting to study the path characteristic frequency-based fault for locating single line to ground fault in radial distribution systems. The fault current in case of single line to ground fault was investigated to study and understand the characteristics of fault when fault occurs either in overhead line or underground cable distribution system. The various case studies are performed by changing the type of distribution system, the location of fault, the inception angle of fault including varying the load

EXPERIMENTAL TEST BENCH

AND DISCUSSION

Overhead line distribution system

Underground distribution system

Findings

CONCLUSION