Partial discharge (PD) is the main cause of electric equipment degradation. PD location can provide the scientific direction and analysis for equipment condition monitoring. The phased-ultrasonic receiving-planar array transducer for PD location in transformer is studied in this paper. The operation environment and material properties of transducer are analyzed. The center frequency of transduc...

Finite Element Analysis (FEA) using Finite Element Method (FEM) was developed over 70 years to solve the complex elasticity and structural analysis problem in civil and aeronautical engineering. Application of FEA is being expanded to simulation in electrical engineering also to solve the complex design problems. The circuit theory models for designing transformers are not much accurate in dete...

The scope of this paper is to describe a real electrical installation of renewable energy using photovoltaic cells. The displayed power grid connected network was established in 2007 at area of Northern Greece. The photovoltaic park is composed of 6120 photovoltaic cells able to deliver a total power of 1.101.600 Wp. For the transformation of DC voltage to AC voltage have been used 25 stand alo...

The gases generated in oil filled transformers can be used for qualitative determination of incipient faults. The Dissolved Gas Analysis has been widely used by utilities throughout the world as the primarily diagnostic tool for transformer maintenance. In this paper, various Artificial Intelligence Techniques that have been used by the researchers in the past have been reviewed, some conclusio...

Online monitoring of dissolved fault characteristic hydrocarbon gases, such as methane, ethane, ethylene and acetylene in power transformer oil has significant meaning for condition assessment of transformer. Recently, semiconductor tin oxide based gas sensor array has been widely applied in online monitoring apparatus, while cross sensitivity of the gas sensor array is inevitable due to same c...

Assessment of power transformer conditions has become increasingly important in recent years. As an asset that represents one of the largest investments in a utility’s system, detection of incipient faults in power transformers is crucial. Dissolved gas-in-oil analysis (DGA) is a successful technique to detect these potential faults and it provides wealth of diagnostic information. This project...

The resistivity of oil impregnated paper will decrease during its aging process. This paper takes paper resistivity as an assessment index to evaluate the insulation condition of oil impregnated paper in power transformer. The feasibility of this method are discussed in two aspects: reliability and sensitivity. Iterative inversion of paper resistivity was combined with finite element simulation...

This paper presents a numerical calculation method that allows for the simulation of mechanical and acoustic behaviour transformer tank. In order to simulate vibroacoustic an oil-immersed power transformer, acoustic-mechanical coupled three-dimensional finite-element model was setup. The is performed in frequency domain at frequencies adjacent driving frequency. A vibration source closely resem...

Oil is utilized in large transformers for its insulation properties and cooling. Mineral oil (MO) not recyclable it poses environment risks as serves transformer. It can be avoided by using a liquid coolant that has all the key qualities of transformer seems to biodegradable. Natural ester, made from plants substitute mineral oil, several profits. More investigations were conducted improve insu...

background: polychlorinated biphenyls (pcbs) are toxic bio-accumulate components and may increase risk of adverse effects on human health and the environment. for different social, technical and economic reasons, significant quantities of pcbs contaminated transformer oil are still in use or storied. the study aimed to determine the effect of hydrogen peroxide and solvent on photolysis of pcbs ...