Mardianaliza Othman
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Preferred name
Mardianaliza Othman
Official Name
Mardianaliza, Othman
Alternative Name
Othman, Mardianaliza A.
Othman, Mardianaliza
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Scopus Author ID
57235542000

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Effect of RTV coating on the electrical performance of porcelain insulator string under dry condition

2020 , Mardianaliza Othman , Muzamir Isa , Z C M Kasa , Mazlee Mohd Noor , M A M Piah

Pollution flashover is one of the primary reasons cause to power system failure in Malaysia. The presence of accumulation on the porcelain insulator surface reduces the electrical performance and also causes the failure of insulation in transmission and distribution lines. This research presents a study on the effect of Room Temperature Vulcanize (RTV) coating on the performances of a string porcelain insulator and their impact on environmental contamination. An attempt has been made to simulate the electric field distribution of 33 kV insulators using the finite element method (FEM). From the simulation results, the maximum electric field distribution is obtained at the pin insulator of a clean insulator, while the cap insulator indicated the minimum electric field. With the existence of the contamination layer, the electric field distribution of the porcelain surface results in a reduction trend.

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Simulation analysis for 33 kV porcelain insulator string based on room temperature vulcanize coating

2023 , Mardianaliza Othman , Siti Huzaimah Kamal Hamadi , Muzamir Isa

Porcelain insulator is widely used in high voltage (HV) transmission lines due to its high mechanical strength, performing well on heat and aging resistance. However, porcelain insulator string is always exposed to environmental contamination. The presence of accumulation contamination on the porcelain insulator string surface reduces the electrical performance and causes insulation failure in transmission and distribution lines. Literature has shown that the conventional method to prevent contamination is limited to periodically water washing and silicone grease, involving some limitations in practice from the technical and economic point of view. Therefore, this research investigates the performance of porcelain insulator string due to the contamination effect based on Room Temperature Vulcanize (RTV) coating in 33 kV transmission line system. The four-unit porcelain insulator string in 2-D form was first developed using computer-aided design (CAD). Electric field and voltage distribution results were analysed using finite element method (FEM) software. After adding RTV coating, the percentage decrement of electric field distribution value is 9.73% from the study. This has proven that the porcelain insulator string with a significantly lower electric field distribution may protect the transmission lines from a higher risk of corona or even flashover.

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Review on RTV silicone rubber coatings insulator for transmission lines

2020 , Siti Huzaimah Kamal Hamadi , Muzamir Isa , Syahrun Nizam Md Arshad @ Hashim , Mardianaliza Othman

Nowadays, the usage of RTV Silicone Rubber as Insulator coatings are increased due to its advantages to avoid pollution flashover of contaminated insulator. Besides, the coatings can reduce the maintenance cost and scheduled routine. This paper had introduced the advantage of RTV Silicone Rubber coatings on insulator, such as good adhesion, nominal thickness range and good hydrophobicity. There are three method of coatings application, such as brushing, spraying and dipping. Suitable method is used to specific insulator application. Meanwhile, this paper also explained about installation of coated insulator in the field.

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Development and Performance Analysis of the Rogowski coil sensor for Arcing Fault Measurement

2020-03-20 , Ayob Nazmy Nanyan , Muzamir Isa , Mohamad Nur Khairul Hafizi Rohani , Haziah Abdul Hamid , Afifah Shuhada Rosmi , Mardianaliza Othman , Ahmad Zaidi Abdullah , Zamri Che Mat Kasa , Ami Nurul Nazifah Abdullah

Arcing fault is an overvoltage that usually occurs in the power system network, and it is necessary to monitor this phenomenon in electrical equipment. This paper presents the Rogowski coil (RC) as an arcing fault sensor. Finite element method (FEM) software used for analysing the RC magnetic flux density with two types of RC with the different turns and size demonstrated. The sizing of RC based on the 240 mm2 cross-link polyethene (XLPE) 11 kV underground cable. The prototypes of the RC sensors were designed using Solidworks software and three-dimensional (3D) printer for fabrication purposes. The main objective of the experiment is to investigate the RC effect with high magnetic flux density by implementing in real measurement. An experimental setup for real arcing fault with various voltages (up to 15 kV) was conducted to verify the RC performance, such as sensitivity and bandwidth range. The result has shown that the bandwidth of RC 1 is higher than RC 2 in all measurement by 22.6%.

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