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Aging of transformer occurs as the transformer operates. Dielectric characteristics testing of oil insulation in transformers is needed to estimate the condition of transformers due to aging. Insulating materials in long-term operations will degrade gradually and cause the change of its properties. In this paper, a database of result for dielectric characteristics was analyzed statistically using...
Power apparatus is usually enclosed by metal box or metal shield. The partial discharge (PD) detection system needs to be designed for this power apparatus. This paper discusses the effect of the presence of the metal box on partial discharge (PD) waveform and partial discharge pattern detected by using high frequency current transformer (HFCT). The PD source is needle plane electrode in air. The...
Regarding the intermittent nature of photovoltaic (PV) connected to grid, there will be a change in the operational mechanism. The energy generated from PV is highly dependent on the solar radiation. There are differences between using PV Farm from PLN (State-Owned Electricity Company) and IPP (Independent Power Plant). Modelling PV Farm from PLN implies the large cost of installation but little charge...
In this paper, a concept to optimize power generated by a stand-alone photovoltaic (PV) system is proposed. A modification of algorithm control technique for optimizing of battery charging, overcharge protection and maximum power tracking have implemented. The optimum power generated can be achieved by improving the control technique (bootstrap technique) of P&O maximum power point tracking (MPPT)...
Insulation system of power transformers consists of solid insulation and liquid insulation. Insulation system has a function to insulate among active parts or between active parts to ground. Insulation system, especially insulation paper could lose its ability to insulate due to ageing which consist of several mechanism i.e. hydrolysis and pyrolysis. Those two mechanisms can be detected by observing...
Electricity in rural area of Indonesia is mostly in small-scale with diesel generator as the main power source. These diesel generators are mostly in the latter stage of operational age, thus have limited capability and poor performance. Microgrid has been introduced lately, as a system to integrate more renewable energy sources to the existing power system. Photovoltaic (PV) source is one of the...
Nowadays, the solar power systems are quickly developing in many countries to replace the fossil power sources and mitigate the environment pollution. The working efficiency of the power conditioner system in the solar power system is not high because the energy supply from solar array depends on the weather. The utilization rate of the power conditioner system can be increased by supplementing the...
Single-step synthesis of γ-alumina (γ-Al2O3), by wire-explosion process (WEP), is described in this work. Molecular oxygen is used as ambient gas with different levels of pressure to obtain the corresponding oxide nanoparticles (NPs). The energy (E) deposited to the capacitor, used for the explosion is in multiples of the sublimation energy. XRD and TEM techniques are used to characterise the synthesized...
Most of power transformer design today is still using oil filled type which laminated iron core with paper insulated copper conductors. Oil is an important part in power transformers as electrical insulation, information carrier and cooling medium. Besides oil, paper insulation also plays important role as dielectric material of transformer. The influence of oil especially vegetable-based oil and...
Energy management in Pemaron's Gas Power Plant is applied to perform more efficient achievement when it is operated. One of the indicators for the efficiency is the quantity of the fuel used by the plant, such as Pemaron power plant which use HSD to minimize fuel consumption, so it will reduce the emission and optimizing cost. This study aims to determine the impact of energy management on reducing...
Failure due to external fault. This external fault, known as through fault current (TFC), determined as fault occur on low side of transformer. This condition become an issue in PLN transmission unit nowadays because this fault highly effected to the lifetime of transformer, especially distribution transformer (150/20 kV and 70/20 kV). Beside the loss of the material, it is also bring the consequence...
In 2014, PT. PLN (Persero) P3B Jawa Bali has 150/20 kV power transformers as much as 695 transformers. The average lifetime of 150/20 kV transformers is 14.55 years while it was designed for 40 years. The delayed of feeder protection on handling disturbance can cause through fault current of the transformer. Through fault current may result abnormalities. Dissolved Gas Analysis (DGA) can be used for...
This paper presents novel of power system stabilizer in which intend to investigate and observe the oscillation due to disturbances then define power angle difference on South Sulawesi grid. The symmetrical three phase fault and single phase fault to ground have been implemented and results show that the 150 kV of South Sulawesi grid tend to reach the limit of transient stability and then subject...
Circuit breaker (CB) installed for capacitor bank is the CB which commonly experiences the switching process due to the capacitor bank function as a voltage regulator. In closing switching process, CB encounter transient condition due to inrush current. In this paper, the simulation for studying the inrush current characteristic of capacitor bank switching in Indonesia has been performed. Simulation...
In Indonesia distribution system, the power distribution from 20/0.4kV transformer to customer feeder is done using low voltage switchboards. Low voltage switchboard utilized in Indonesia distribution system is consist of several fuse rails, where each fuse rail supplies one customer feeder and the amount of fuse rail that is mounted to low voltage switchboard is depended on the capacity of 20/0.4kV...
One of the most effective methods to assess the quality of solid insulated cable under AC or DC voltage is partial discharge (PD) analysis. Several common methods to analyze PD phenomenon based on PD data sets, such as PD magnitude, phase, and occurrence time, have been investigated and interpreted. In this paper, a new approach using the statistical parameters obtained from the PD magnitude density...
Belitung island will be developed as one of tourism economic zone. Regarding to this situation, the electricity will increase the capability of supply by using non fossil fuel power generation. Integration of intermittent renewable energy such as photovoltaic farm become a main concern in this development. This paper deal with a mechanism to calculate a maximum penetration of PV farm in the Belitung...
In this paper, an economic analysis for a grid connected residential photovoltaic system in Malaysia is presented. The Feed in Tariff (FiT) and recently introduce Net Metering Policy (NEM) were described. The payback period and return on investment for the residential scale photovoltaic system were calculated and compared for both policies. For small usage that less than rm250, FiT has a lower payback...
The isolated electrical system is the one solution for electrical distribution in the archipelago. Any disruption to this system would disserve the public and detriment the utility companies because it can't sell the energy. The problem of an isolated solar plant failure is happened in Indonesia exactly in System A. Currently, there are few references that address the investigation of real cases problem,...
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