nan Hermawan

Implementation of photovoltaic and simple resonant power converter for high frequency discharge application

Ozone gas (O3) is widely used in deodorization, decolourization, disinfection, bleaching processes, gas/air treatment, chemical synthesis and recently in medical applications. Due the wide application of ozone then the ozone generator or ozonizer is urgently needed. A single switch resonant converter with ferrite transformer is proposed in this work. The prototype is constructed by two parts, first is ozone chamber and the second part is power converter with a single switch resonant converter and it supplied by photovoltaic simulator. The converter is successful to convert 12 volt from photovoltaic to 1.89 kVpp high frequency voltage to ozone chamber. The ozone gas produce with the proposed system is 450 ppm with oxygen as an input gas.

The Application of Algorithm Genetic for Tuning Power System Stabilizer In Suralaya Power Plant Generation - West Java

In power system, the application of power system stabilizer (PSS) has been proved to overcome the stability of power system. But on the certain condition such as full load, it is necessary to determine the appropriate PSS parameter. This paper presents the application of algorithm genetic for tuning power system parameter stabilizer. The power plant system that is simulated in this paper is the model of Suralaya Power Generation in West Java - Indonesia. The effectiveness of this method is shown in eigen value analysis and the result of response system simulation.

Leakage current characteristics at different shed of epoxy resin insulator under rain contaminants

In this paper we present the characteristics of leakage current at different shed of epoxy resin insulator under rain contaminants. The aim of this paper compared the leakage current characteristics under rain contaminant and dry test. Also it compared when used same and different sheds. The tests were conducted at high voltage laboratory with AC high voltage 50 Hz. Leakage current characteristic of 20 kV outdoor insulators with epoxy resin has been investigated under dry and rain contaminant condition. The chamber was used to placing the insulator. The research results showed that the leakage currents characteristics on insulator surface were affected by rain contaminant and form of shed. A minimum leakage current achieved at outdoor insulator without contaminant or dry test conditions. For outdoor insulator under rain contaminant test, the characteristics of leakage current tend to increase. Shed form of insulator influences the characteristics of leakage current also was analyzed.

Determination of Hydrophobic Contact Angle of Epoxy Resin Compound Silicon Rubber and Silica

Epoxy resin is a thermosetting polymeric material which is very good for application of high voltage outdoor insulator in electrical power system. This material has several advantages, i.e. high dielectric strength, light weight, high mechanical strength, easy to blend with additive, and easy maintenance if compared to that of porcelain and glass outdoor insulators which are commonly used. However, this material also has several disadvantages, i.e. hydrophilic property, very sensitive to aging and easily degraded when there is a flow of contaminants on its surface. The research towards improving the performance of epoxy resin insulation materials were carried out to obtain epoxy resin insulating material with high water repellent properties and high surface tracking to aging. In this work, insulating material was made at room temperature vulcanization, with material composition: Diglycidyl Ether Bisphenol A (DGEBA), Metaphenylene Diamine (MPDA) as hardener with stoichiometric value of unity, and nanosilica mixed with Silicon Rubber (SiR) with 10% (RTV21), 20% (RTV22), 30% (RTV23), 40% (RTV24) and 50% (RTV25) variation. The usage of nanosilica and Silicon Rubber (SIR) as filler was expected to provide hydrophobic properties and was able to increase the value of surface tracking of materials. The performance of the insulator observed were contact angle of hydrophobic surface materials. Tests carried out using Inclined Plane Tracking procedure according to IEC 60-587: 1984 with Ammonium Chloride (NH4Cl) as contaminants flowed using peristaltic pumps. The results show that hydrophobic contact angle can be determined from each sample, and RTV25 has maximum contact angle among others.

Theoretical analysis for ozone yield of a high frequency silent discharge

The paper uses dimensional analysis to develop a theoretical prediction of the yield of a high frequency silent discharge ozone generator at atmospheric pressure. To verify the viability of the resulting yield equation, a rectangular shaped chamber with a 0.75 mm air gap was constructed. Aluminium mesh electrodes were used, with metal tape and a planar mica sheet forming a dielectric barrier. The power supply to the chamber was from a modified class E resonant power inverter. It is established that prediction using the yield equation based on fractional function matches closely with data obtained from the experimental findings.

Integrated LC resonant converter and silent discharge ozonizer for colour removal

Indonesia has palm oil harvesting as the most important agriculture crop. Unfortunately, this agricultural activity delivers a large amount of by product, known as palm oil mills effluent (POME). The treatment using membrane bioreactor has successfully removed the heavy organic component of POME but it left water in colour. This paper proposed the use of a single switch resonant converter with parallel load resoant with dielectric barrier discharge ozonizer to remove colour of treated POME. The ozonizer chamber was made from a planar metal dielectric barrier discharge construction. A single switch resonant converter as power supply to the chamber was designed and it is based on resonance principle. This circuit converted a direct current low voltage input into high frequency and sinusoidal voltage output. The high voltage created micro electrical discharges inside chamber to generate ozone from oxygen molecules. At atmospheric pressure and ambient temperature, the ozonizer deliver up to 2300 ppm ozone gas. The ozone gas was injected into the treated POME for several duration of time. The results of experiment showed that the treated POME water has successfully changed in colour from 100 mg/l Pt.Co into 20 mg/l Pt.Co or lower. As the time of treatment is increased then the colour abatement was below 15 mL/l Pt.Co.

Piezoelectric transformer with pulse dropping technique for high voltage generation

This paper describes implementation design and analysis of piezoelectric transformer with pulse dropping technique to produce high voltage. The main contribution is the implementation of pulse dropping mode in inverter switching mechanism to decrease heat of piezoelectric transformer during the high voltage generation. Piezoelectric transformer fed by inverter in this work is dedicated to generate high voltage in high frequency. How ever, load current drawn from the transformer causes temperature rise and deterioration of internal elements of piezoelectric. As operating temperature reach the maximum limit, the output voltage of piezoelectric becomes non sinusoidal and decreases in magnitude. In pulse dropping technique, there are two modes in period of inverter switching. The first mode is called as power injection and the second is called as relaxation period. The experiments was carried out by a high frequency inverter, power MOSFET as power electronic switch, KW06-559 infra red thermometer to detect temperature of piezoelectric transformer, and resistive-capacitive component as a load. Without the use of pulse dropping technique during experiment, the temperature of piezoelectric reached the maximum limit at 70°C, voltage output was unstable and the piezoelectric was easy to crack. It was found that first mode maintained high voltage output at 2.45 kV peak to peak and the second mode successfully maintained the average temperature of piezoelectric in the range of 35–40°C.

Interconnection of hydro power plant through 20 kV distributed line to improve electrical power supply in Dieng Central Java

Hydro power plant is possible to be present and has interconnection to distribution line. The presence of such power plant is expected to supply additional power and overcome voltage drop at load side. In this paper, several experimental works based on simulation and primary data from field measurement are presented to show the performance of interconnection of hydro power plant through 20 kV distribution line to improve electrical power supply in Dieng - Central Java. Several requirements were observe and investigated by conducting simulation experiment. Several analyses such as Load flow, short circuit and stability were performed. As the results, the presence of hydro power plant has given positive impact to the profile of voltage in 20 kV distribution system. All power flows to the load properly and no reverse power back to the power plant or substation.

Double dielectric barrier discharge chamber for ozone generation

The paper proposes an ozone generation generated by double dielectric barrier discharge chamber which is operated at atmospheric pressure discharge and supplied by high frequency power converter. The air fed or oxygen is bombarded inside chamber that is constructed by a planar type chamber using double aluminum mesh on a metal plate and a double mica sheet as dielectric material. The power converter utilizes the class E parallel resonant converter operated at 39 kHz and maximum voltage 3 kV peak to peak.. The system is able to produced ozone product more than 150 ppm. Due to the simplicity and low cost design, it can be suitably used for low-density application such as home water treatment.