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Detection of power transformer bushing faults and oil degradation using frequency response analysis Open
Frequency response analysis (FRA) has been globally accepted as a reliable tool to detect mechanical deformation within power transformers. However, because of its reliance on graphical analysis, interpretation of FRA signature is still a …
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Motor Oil Viscosity Stratification in Friction Units of Marine Diesel Motors Open
The phenomenon of the motor oil viscosity stratification in lubricating the cylinder-piston units of marine diesel engines has been investigated. The correlations for determining the shear stress and the velocity, occurring in the liquid f…
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Ride Comfort Optimization of In-Wheel-Motor Electric Vehicles with In-Wheel Vibration Absorbers Open
This paper presents an in-wheel vibration absorber for in-wheel-motor electric vehicles (IWM EVs), and a corresponding control strategy to improve vehicle ride comfort. The proposed in-wheel vibration absorber, designed for suppressing the…
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Fault diagnosis of the bushing infrared images based on mask R‐CNN and improved PCNN joint algorithm Open
Bushings are served as an important component of the power transformers; it's of great significance to keep the bushings in good insulation condition. The infrared images of the bushing are proposed to diagnose the fault with the combinati…
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Temperature‐dependent electric field distribution in ±800 kV valve‐side bushing insulation for a converter transformer Open
The electric field distribution is determined for the design and long‐term performance of bushing yet gets complicated when coupled with temperature due to the highly temperature‐dependent conductivity of insulation. An electrothermal coup…
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Prediction the wear of sliding bearings Open
The problem of developing a calculation-experimental method for calculating wear of a sliding bearing based on a two-factor wear model (contact pressure - sliding velocity) with identification of wear resistance parameters was considered. …
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Maintaining Boundary and Hydrodynamic Lubrication Modes in Operating High-pressure Fuel Injection Pumps of Marine Diesel Engines Open
Background/Objectives: The effects of hydrodynamic and boundary lubrication occurring in the plunger-bushing friction pair of the high-pressure fuel injection pump in marine combustion engines have been studied. Methods: To determine thick…
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Highly conductive polymer nanocomposites for emerging high voltage power cable shields: experiment, simulation and applications Open
High voltage power cables play a critical role in global electricity transmission and distribution. The currently used power cables cannot fulfil the green and sustainable requirement of modern society because of the thermoset nature of ca…
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Calculation-experimental modeling of wear of cylindrical sliding bearings Open
Запропонована модель зношування підшипника ковзання в умовах граничного тертя у вигляді залежності інтенсивності зношування від контактного тиску і швидкості ковзання. На основі моделі зношування вирішена зносоконтактна задача для циліндри…
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Differential Magnetometer Measurements of Geomagnetically Induced Currents in a Complex High Voltage Network Open
Space weather poses a hazard to grounded electrical infrastructure such as high voltage (HV) transformers, through the induction of geomagnetically induced currents (GICs). Modeling GICs requires knowledge of the source magnetic field and …
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Investigation on distribution of electro‐thermal coupled field and improved design of ±1100 kV converter valve‐side bushing Open
Compared to bushings with lower voltage levels, the ±1100 kV converter valve‐side bushing has thicker radial insulation and longer axial insulation resulting in a more uneven temperature distribution and more severe electric field distorti…
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Modeling and Verification of a New Hyperelastic Model for Rubber‐Like Materials Open
The essential evaluation criterion for the hyperelastic model is its ability to describe the mechanical behavior of rubber‐like materials under different deformation modes over a large deformation range accurately. Based on the Seth strain…
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Optimum bushing length in thermal drilling of galvanized steel using artificial neural network coupled with genetic algorithm Open
Thermal drilling is a novel sheet-metal-hole-making technique that utilizes the heat produced at the interface of the rotating conical tool and workpiece in order to soften the workpiece and pierce a hole into it.In this work, experiments …
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Simulation and experimental analysis of three‐dimensional temperature distribution of ±400‐kV converter transformer valve‐side resin impregnated paper bushing under high current Open
In order to cope with the current engineering demand for increasing the current‐carrying capacity of resin impregnated paper (RIP) bushing, an optimization scheme of RIP bushing was proposed in this paper. Simulation and experimental studi…
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The Impact of Bushing Thickness on the Piston/Cylinder Interface in Axial Piston Pump Open
A comprehensive multi-domain simulation tool that could predict the lubricating flow between piston and bushing in the cylinder is presented in this paper. The first module simulates the main flow through the piston pump according to a lum…
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The Mechanism and Diagnosis of Insulation Deterioration Caused by Moisture Ingress into Oil-Impregnated Paper Bushing Open
The healthy state of insulation in oil-impregnated bushings is traditionally evaluated by tanδ and capacitance at power frequency and mostly at 10 kV in the test standard. However, there has frequently been insulation accidents induced by …
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Propagation and localisation of partial discharge in transformer bushing based on ultra‐high frequency technique Open
As an essential component of power transformers, the detection and diagnosis of incipient partial discharge (PD) activities of bushings are of great significance. A 35‐kV oil‐impregnated paper (OIP) bushing is investigated. The bushing is …
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On-Line Monitoring of Partial Discharge of Less-Oil Immersed Electric Equipment Based on Pressure and UHF Open
For partial discharge (PD) detection of less-oil immersed electric equipment (CT, PT, bushing), frequent sampling of oil chromatographic is likely to cause negative pressure inside the equipment, and by modifying the terminal tap to access…
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Effect of Surface Topography and Structural Parameters on the Lubrication Performance of a Water-Lubricated Bearing: Theoretical and Experimental Study Open
This study explored the influence of the surface topography of a bushing on the lubrication performance of a water-lubricated bearing. Bushing deformations were considered in the mathematical model. Theoretical calculations and experiments…
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Cold Expansion Strengthening of 7050 Aluminum Alloy Hole: Structure, Residual Stress, and Fatigue Life Open
The 7050 aluminum alloy orifice plate is extruded and strengthened by the cold expansion process of slotted bushing holes. A three-dimensional finite element model was established for cold expansion strengthening of holes, and the residual…
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SF <sub>6</sub> decomposition behaviour under partial discharge of typical insulation defects in gas‐solid insulated valve‐side bushing of converter transformer Open
In this paper we investigated SF 6 decomposition behaviour of typical insulation defects in gas‐solid insulated converter transformer valve‐side bushing under partial discharge (PD). Additionally, we compared the results with that of gas i…
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Design of adaptive bushing based on field grading materials Open
Electrical bushings, as important power system components, are critical to the reliability of power systems. The capacitance‐graded bushing is a type of high voltage bushing that is most commonly used in current power systems. However, the…
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Friction Drilling of Difficult-to-Machine Materials: Workpiece Microstructural Alterations and Tool Wear Open
Difficult-to-machine materials are metals that have great toughness, high work-hardening, and low thermal conductivity. Friction drilling of difficult-to-machine materials is a technically challenging task due to the difficulty of friction…
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Research on the dynamic characteristics of electric field distribution of the ± 1100 kV Ultra high voltage converter transformer valve‐side bushing using weakly ionised gas conductance model Open
Ultra high voltage (UHV) converter transformer valve‐side bushings are the key equipment indirect current (DC) transmission projects, and are subjected to high voltage and large current with large number of harmonics simultaneously. The el…
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Effects of aging on the structural, mechanical, and thermal properties of the silicone rubber current transformer insulation bushing for a 500 kV substation Open
In order to analyze the cracking and aging reason of the silicone rubber current transformer (CT) insulation bushing used for 8 years from a 500 kV alternating current substation, characteristics including Fourier transform infrared (FTIR)…
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Monitoring of transient overvoltages on the power transformers and shunt reactors – field experience in the Croatian power transmission system Open
Power transformers and shunt reactors may be subjected to various dielectric stresses such as lightning and switching overvoltages. Since the exposure of equipment to overvoltages during operation and the overvoltage amplitudes are usually…
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Theoretical and Numerical Investigations on Static Characteristics of Aerostatic Porous Journal Bearings Open
To investigate the static characteristics of aerostatic journal bearings with porous bushing, the flow model—in which the compressibility of lubricating gas is considered—is established based on the Reynolds lubrication equation, Darcy equ…
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Electric Field and Thermal Analysis of 132 kV Ceramic Oil-Filled Cable Sealing Ends Open
This paper reports on a method combining the use of finite element simulations and external measurements to provide preliminary condition diagnosis of oil-filled cable sealing ends (CSEs) without requiring downtime. Good agreement has been…
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Calculation of Hot Spot Temperature of Transformer Bushing Considering Current Fluctuation Open
The transformer bushing hot spot temperature (HST) seriously affects its performance and design. In this paper, a novel method for calculating the hot spot temperature of bushing is proposed, in which the principle of constant joule heat i…
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Corrosion reaction kinetics and high‐temperature corrosion testing of contact element strips in ultra‐high voltage bushing based on the phase‐field method Open
For the structural characteristics of power transmission equipment such as bushings, the plug‐in structure is mostly used for current‐carrying connections owing to the large size and long distance at high voltage levels. The contact elemen…