Insulation oil is one of the most important components in an oil-insulated transformer. With use dissolved gas analysis (DGA) tool, condition transformer can be studied and predicted to prevent unwanted events from occurring. However, due rising issues related stray gassing phenomenon that causes false interpretations condition, there a need find out factors contributing formation gases oil. In...

This paper presents a bistable microswitch fully batch-fabricated on a single glass wafer, comprising of a microactuator, a signal transformer, a microspring and a permanent magnet. The bistable mechanism of the microswitch with large displacement of 160 μm depends on the balance of the magnetic force and elastic force. Both the magnetic force and elastic force were optimized by finite-element ...

The aging of electrical insulation material or a system is a main issue for designers of high-voltage (HV) machines. Precise determination of the life cycle of electrical insulation is one way of improving the efficiency of electrical machines involved in the production and transmission of electrical energy. Much effort has been devoted to preparing statistical or physical methods of Electrical...

Abstract This article uses an image processing method to study the hydrophobicity of transformer composite insulators, and then determine surface aging performance insulators. In order meet requirements randomness ambiguity hydrophobic image, this paper a series algorithms process insulator: enhancement based on adaptive histogram equalization, wavelet transform Filtering segmentation grade cla...

Degradation of cellulosic materials can be identified by measuring dissolved carbon oxide gas content in oil, Degree Polymerization (DP) of paper and 2-Furfurol content in oil. Each method has some advantages and limitations. In case of dissolved carbon oxide gas analysis and furan content determination, sampling is easy but interpretation of result is not very reliable. On the other hand DP me...

Water can be an irritant to a power transformer, as it is recognized major hazard the operation of transformers. The water content transformer insulation system comprises in oil and cellulose paper. increase leads reduced breakdown voltage, accelerated aging oil–paper system, possibility producing bubbles at high temperatures. Therefore, various techniques have been applied measure both paper i...

It is well known that existence and accumulation of space charge within the insulating material poses threat to the reliability in the operation of dc power cables. When the cables are loaded under high voltage direct current (HVDC), temperature gradient is developed across the insulation material. In this paper, commercial ac XLPE power cables were used under an application voltage of 80 kV dc...

HVDC (high voltage direct current) transmission is an effective way to transport electrical power over long distances by using direct current. The insulation system of HVDC components has to be designed for both AC and DC field distributions. It consists of mineral oil and pressboard. The used insulation material behavior has not been completely understood under DC stress. In this paper, electr...

Abstract The bushing is one of the most important components power transformer, and it very to find internal defects bushings as soon possible, effectively accurately diagnose its insulation state information. In this paper, active loss 500kV transformer have been analyzed, evaluation method based on proposed. To verify feasibility method, abnormal was selected analyze state. result shows that ...