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Ongoing Research Projects

 

Project Title:
Insulation Characteristics of Palm-Based Power Transformer Oil under Partial Discharge Activities and Lightning Impulse

 

Project descriptions:
Palm-based oil is gaining worldwide attention as sustainable resources and is becoming a competitor to petroleum-based oil for insulating liquids in high voltage transformers. However, palm-based oil has high concentration of unsaturated fatty acid, making it unstable and prone to oxidation. The development of nanofluid (NF) technology has been introduced by recent researchers where the goal of nanofluids in high voltage engineering is to achieve the best possible electrical and thermal properties. The number of publications reported on nanofluids has increased per year but only a limited number has focused on electrical properties. Based on several publications, there are evidences shown that Fe3O4, TiO2, and SiO2 nanoparticles can improve the breakdown strength of mineral and vegetable oil. Therefore, this work is conducted to examine the improvement of dielectric properties of nanofluid palm-based oil as high voltage liquid insulating material.

 

 

Project Title:
Development of intelligent insulator condition monitoring system

Project descriptions:
Outdoor insulators are now widely used as it plays an important role in maintaining the reliability of the power system. Besides subjected to the partial discharge, the insulators are also directly subjected to the weather continuously during its service. Subsequently, the deterioration and vandalism of insulator may cause insulation breakdown and damage to the whole power system. The maintenance of the system is costly and very time consuming. Thus, insulator condition monitoring using image processing and artificial intelligent method is proposed.
 

 

 

  Project Title:
Investigation on the effect of indirect lightning stroke on 132kV transmission lines in Malaysia

Project Descriptions:
Indirect lightning strikes pose major problem to consumers as the electromagnetic field emitted by the return strokes may reach any nearby power system network. The electromagnetic field may induce and couple impulse overvoltage on the nearby power system networks and affecting them. Hence, indirect lightning induced overvoltage patterns are studied on a 132kV double circuit transmission line in Malaysia. The overvoltage induced on the transmission line was observed under different parameters related to the lines and tower. Through this study, a better understanding of the effect of indirect lightning stroke on 132kV transmission line can be achieved.

 

 

Project Title:
Optimisation of corona ring dimensions on high voltage power transmission lines using various artificial intelligence methods

Project Descriptions:
Insulator string is an important equipment on high voltage transmission lines. High electric field on the insulator string may increase the likelihood of corona phenomenon. Thus, the use of a corona ring can reduce the likelihood of corona occurrences. However, the design of a corona ring has to be optimized to achieve the best performance of the insulator string. Therefore, the electric field distribution on an insulator string with and without a corona ring and the optimisation of a corona ring design are investigated. The electric field distribution along the insulator string is obtained using finite element analysis (FEA) software. The electric field as a function of various parameters of the model is used in the artificial intelligence method to find the optimum design of the corona ring. Different artificial intelligence methods are used to identify which method yields the most optimised corona ring design.
 

 

 

  Project Title:
Electrical characteristics of various polymeric materials for high voltage insulation application

Project Descriptions:
The electrical characteristics of good insulation materials for high voltage equipment include high breakdown strength, low tan delta and strong partial discharge and electrical treeing resistance. The most commonly used insulation material type is polymeric material. This project analyses the electrical characteristics of different types of polymeric materials for comparison. Different types of polymeric materials are also mixed together with different percentage of compositions to determine which combination of the mixture yields the best electrical characteristics. Hence, improvement on the existing polymeric materials can be proposed.

 

 

Project Title:

Partial discharge characteristics within voids in dielectric materials with nanofillers

 

Project Descriptions:

 

Partial discharge (PD) may cause breakdown of an insulation material when the repetition of PD events within a defect is very high, which causes chemical and physical deterioration of the insulation. When breakdown of the insulation occurs, breakdown of the whole high voltage components may occur. To overcome this problem, a material of higher PD-resistance can be used as insulation. One suggestion that has been proposed is the use of a dielectric material filled with nanofiller. Nanofillers studies have been on-going since the last decades. However, research on PD characteristics within a void in a nanofiller/dielectric material is not widely published. Therefore, in this project, measurement of PD activity will be performed on test samples consisting of a void in an epoxy resin filled with different nanofillers. A model of a void in a solid dielectric insulation material filled with nanofillers will also be developed using finite element analysis (FEA) software. The model will be used to simulate PD activity within a void in a nanofiller/dielectric material and will be compare with the measurement results.

 

 

 

  Project Title:
Optimization of Zinc Oxide surge arrester design in reducing leakage current

Project Descriptions:
Nowadays, zinc oxide surge arresters (ZnO) are widely used in power systems. However, leakage current is commonly flow across ZnO under non-conducting condition. Leakage current is known to be directly related to the degree of degradation of ZnO arrester. An understanding of leakage current flow across ZnO arrester can be enhanced through modelling. Therefore, in this work, a model of Zinc Oxide surge arrester will be developed using finite element analysis method to simulate leakage current across the arrester. Then, the developed model will be used to find the optimized design of Zinc Oxide surge arrester in reducing the leakage current using optimisation methods. To validate the simulation model, the simulated results will be compared with measurement results of leakage current across the surge arrester. For this purpose, measurement of leakage current in Zinc Oxide surge arrester under various conditions will be performed. Through this work, a better understanding of leakage current across ZnO arrester can be attained, which may help condition monitoring analysis on surge arrester in electrical utilities.



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