Bushing is an indispensable component in high voltage direct current (HVDC) transmission project. As the main insulating material possesses poor thermal conductivity and negative temperature coefficient (NTC) electrical resistivity, HVDC bushing suffers from distortion of electro-thermal-coupled fields. Therefore, it urgent to reveal influence resistivity-temperature characteristic on DC electr...

At present, the tendency to implement the conditionbased maintenance (CBM), which allows the optimization of the expenses for equipment monitoring, is more and more evident; also, the transformer substations with remote monitoring are increasingly used. This paper reviews all the advantages of the on-line monitoring and presents an equipment for on-line monitoring of bushings, which is the own ...

Abstract The valve‐side bushing of the UHV converter transformer is key equipment in DC transmission project, and its running state directly affects security stability power system. This paper analyses attributes physical entities, uses digital twins to establish feature set proposes a zero‐sample evaluation algorithm for bushing. First, geometric, materials electrical characteristics are analy...

B. Gajdzik, The Silesian University of Technology, Faculty of Materials Science and Metallurgy, Katowice, Poland J. Sitko, The Silesian University of Technology, Faculty of Organization and Management, Zabrze, Poland The article presents the subject matter of steel mill product analysis using quality tools. The subject of quality control were bolts and a ball bushing. The Pareto chart and fault...

This paper presents bushing condition monitoring frameworks that use multi-layer perceptrons (MLP), radial basis functions (RBF) and support vector machines (SVM) classifiers. The first level of the framework determines if the bushing is faulty or not while the second level determines the type of fault. The diagnostic gases in the bushings are analyzed using the dissolve gas analysis. MLP gives...

Power transformer bushings withstand great electrical and mechanical stress during high voltage current working conditions. Sealing failure poses a threat to the long-term reliable operation of bushing power transformer; however, criterion evaluate sealing status caused by problems is still lacking. In this paper, model established gain theoretical insight into relationship between temperature ...

Abstract The transformer bushing is an important monitoring object of the substation online system. end screen current one parameters to characterize insulation state bushing, by collecting full power frequency and partial discharge pulse high-frequency domain. Based on TMR array sensing principle, this paper studies wide-band domain technology for monitoring, integrates it with ground terminal...

The reliability of the power transformer depends on performance its bushing. Transformer bushings subjected to hot conditions or high temperatures for a long period time can cause bushing failure. Bushing failure result damage such as bursting conservator tank, explosion and fire. purpose this study was determine temperature spot at Unit II Pekalongan Substation (GI) in order avoid transformer....

Abstract As con-rod is a critical component in an engine, its reliability overwhelmingly directly affects the performance of whole diesel engine. The fretting wear bushing mainly occurs on contact surface with small end and cap. In proposed study, process end, cap under maximum combustion pressure condition was analyzed, distribution friction stress analyzed. Then orthogonal simulation test des...

Today, tool life in high pressure die casting (HPDC) is of growing interest. A common agreement that primarily decided by the thermal load and temperature gradients materials. Conformal cooling with growth additive manufacturing has raised interest as a means extending life. In current paper, conformal channels’ performance effect on cycle high-pressure rheocasting are investigated for conventi...