Mohd Muhridza Yaacob

A new polyvinyl chloride cable insulation using micro and nano filler materials

The dielectric strength of cable insulation depends on many factors such as the existence of filler material in the insulation. In this work, laboratory studies on a new filler material for cable insulation have been conducted. The influence of calcium carbonate and bentonite fillers on the dielectric strength of polyvinyl chloride (PVC) cable were analyzed. Polymer structure was changed during the processing and influence in the dielectric properties. Those specimens produce from both formulations were tested on dielectric strength under alternating current stress. The analysis result was further characterized on scanning electron microscope (SEM) and density for further confirmation. Dispersion of the filler is examined by using the scanning electron microscope (SEM) while the density of specimens is measured by density meter. Comparison is made between the result of measurement and the actual density of the specimens. From the results, it is shown that the filler material has improved the dielectric strength of the cable insulator.

Dielectric property of Waste Tire Dust-Polypropylene (WTD-PP) composite for high voltage outdoor insulation application

High voltage insulation technology is still undergoing continuous development and improvement from time to time, from conventional ceramic type since to newly polymeric composite insulation material. This includes the development of new composite materials. This paper focused on the possibility of using Waste Tire Dust-Polypropelene (WTD-PP) composite with Alumina Trihydrate (ATH) as the main reinforcement filler for high voltage insulation material. Compound of WTD-PP without and with ATH were prepared with different compositions of WTD-PP content and different amount of ATH filler. A step of processes to produce this newly polymeric composite is presented in this paper. The basic requirement to determine and evaluate the performance of the selected materials as high voltage outdoor application shall comply to the international standard, BS EN 62039:2007. This standard lists several requirements of electrical and mechanical properties that must be fulfilled for materials to be used for high voltage outdoor application. Experimental work has been conducted on the dielectric strength of WTD-PP composite. Breakdown test complying with BS EN 60243-1:1998 is adopted to examine the breakdown strength of this newly polymeric composite. It was found that the breakdown strength of these composites is less than 10kV/mm due to it carbon black content but can be used for lower voltage insulation application.

In Situ Detection and Localization of Partial Discharge Using Acoustic Sensors

The partial discharge (PD) phenomenon is very harmful for electrical appliances and its early detection could be a cost effective approach for the industry. Although many techniques are used for PD detection yet no technique has presented widely acceptable solution. Still the subject needs parallel study of the detection techniques. In this study, partial discharge signal has been captured by the three techniques using fiber optic sensor (FOS), Piezoelectric Sensor (PZT), leakage current (LC) techniques. In these experiments, FOS shows good sensitivity in the range of applied high voltage > 5 kV. The sensitivity and noise level of PD signal was different in these two experiments. The location of a PD was demonstrated in a 500 gallon water tank using convolution method.

Partial Dicharge Signal Analysis in Insulation Oil Using Optical Chromatic Technique

In this work optical chromatic approch has been use to analyze PD signals in insulation oil. The study of chromatic approach of acoustic emission for PD phenomenon addressing PD signals with three detectors red, green and blue (R,G,B) having non-orthogonal (overlapping) responses. The outputs of the three detectors are transformed into a number of chromatic parameters designated x, y, z as well as hue, lightness and saturation (H,L,S). The x, y, z represents the proportion of the signal from each of the three processors while H, L, S represents the dominant phase, effective strength and notional spread of the PD signals respectively. This technique provides a high degree of traceability in relating the chromatic parameters to the raw PD signals. Changes in the values of the chromatic parameters are shown to reflect various PD trends and to provide early indications of incipient insulation failure and PD source discrimination.

In Situ Detection of Partial Discharge Using Leakage Current, Fiber Optic Sensor and Piezoelectric Sensor Techniques

The partial discharge (PD) phenomenon is very harmful for electrical appliances and its early detection could be a cost effective approach for the industry. Although many techniques are used for PD detection yet no technique has presented widely acceptable solution. Still the subject needs parallel study of the detection techniques. In this study, partial discharge signal has been captured by the three techniques using fiber optic sensor (FOS), Piezoelectric Sensor (PZT), leakage current (LC) techniques. In these experiments, FOS shows good sensitivity in the range of applied high voltage > 5 kV. The sensitivity and noise level of PD signal was different in these two experiments.