ENGINEERING RESEARCH PAPERS

transformer 2016 IEEE PAPER




Power Balance Theory Control of an Integrated Electronic Load Controller with Zig-Zag Transformer for Stand-Alone Wind Farm with PV Array Connected to
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Abstract Wind Turbine (WT) with PV array power generation attracted attention to supply electricity in remote areas because of its self-sustainability, environment friendly and economic reasons. This paper propounds isolated Wind turbine and PV array generating

THEORETICAL ANALYSIS OF SEVERAL WORKING PAIRS FOR ADSORPTION HEAT TRANSFORMER APPLICATION
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Currently a large amount of thermal energy, especially in the industrial sector, is discharged in atmosphere since its temperature level is too low to be considered useful for further applications. Such a heat stream is usually defined as low-grade waste heat. A rough

Power Balance Theory Control with Internal Model Controller Based Integrated Electronic Load Controller with Zig-Zag Transformer for Stand-Alone PEM Fuel
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Abstract Fuel cell (FC) power generation has drawn attention to supply electricity to rural areas because of its portability, self-sustainability, high potential capability, modularity, environment friendliness, easy maintainence and less weight. This paper presents stand-

A Three Phase Transformer Modelling For Distribution System
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Abstract The purpose of this paper to present that how a three phase transformer can be modelled in some definite parameters that can be used to represent a transformer in distribution system. These model will follow Kirchhoff's current, voltage law the ideal

A High Transformer Ratio Scheme for PITZ PWFA Experiments
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Abstract In the field of plasma wakefield acceleration (PWFA) significant progress has been made throughout the recent years. However, an important issue in building plasma based accelerators that provide particle bunches suitable for user applications will be a high

Submodule Configuration of HVDC-DC Auto Transformer Considering DC Fault
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Abstract: This paper studies the submodule configuration of MMC based non-isolated HVDC- DC autotransformer (HVDC-AT) with DC fault blocking capability, including two-terminal and multiterminal topologies. The operation principle of the HVDC-AT is described.

A predicate/state transformer semantics for Bayesian learning
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Abstract This paper establishes a link between Bayesian inference (learning) and predicate and state transformer operations from programming semantics and logic. Specifically, a very general definition of backward inference is given via first applying a predicate transformer

Multicriteria transformer asset management with maintenance and planning perspectives
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Abstract Strategic asset management of transformer fleets in electrical power systems is a critical aspect for distribution utilities. In this work an integrated framework for multicriteria asset management is presented. A multiobjective optimization model is deployed,

Particle tracing modelling on moisture dynamics of oil-impregnated transformer
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Abstract: An accurate estimation of moisture in oil-impregnated cellulose of a transformer is difficult due to the complex moisture dynamics inside the transformer, which is highly influenced by the temperature and dimension of the transformer. In this paper, a novel

Optimization and Performance Analysis of CI Engine by Using UsedTransformer Oil Blends with Diesel as Alternative Fuel
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Abstract: The increased demand for renewable energy sources and developing countries like India's need to secure its energy supply has spurred interest in development of bio fuel production whereas the exhaust emission of the biodiesel is deteriorating the environment

Evaluation and Analysis Techniques of Transformer Performance in JFE Steel
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Abstract: Iron losses and acoustic noise in transformers are analyzed using model transformers in JFE Steel. In this paper, techniques to measure local iron losses and vibrations in model transformer cores are described. Distributions of magnetic fluxes and

Analysis and Design of a Multi-Tapped High-Frequency Auto-TransformerBased Inverter System
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Abstract:The Google Little Box Challenge, an open competition to build the world smallest 2 kW Photo-Voltaic (PV) inverter, triggered a trend in the power electronic community to design PV inverter systems with a very high power density. In particular, in this paper, a

Difficulties in high frequency transformer modelling
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First, stable but non-passive rational function is identified by solving non-linear minimization problem as two linear problems („vector fitting algorithm); Then, the non- passive model is checked for passivity violations and those violations are fixed by

Modeling and experimental testing activity of the Voltage Optimization Unit.: Testing activity of the distribution transformer with single-phase on-load tap changer
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In the EUDP project 'Energy saving by voltage management'two reports are provided by Technical University of Denmark (DTU) covering the simulation studies and experimental work. The first report presented the simulation results regarding the technical evaluation of

Evaluation Study of Performance Analysis Characteristics of Amorphous Core Transformer for Electrical Distribution System
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ABSTRACT Nowadays traditional use of other materials such as Al, copper etc increases the transmission losses, cost and reduce the efficiency but on the other hand amorphous core material design that reduces losses upto 25-40 percent improves the efficiency and

Circuit Module Design of High-Voltage Side for Optical Current Transformer
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Abstract The Field Programmable Gate Array (FPGA) technology has been used for designing the signal processing circuit of A/D device, CRE code and Manchester module of highvoltage side for optical current transformer in this paper. The A/D controlling module,

Three Phase Grid Connected Transformer less Inverter for Photovoltaic with PMSM drive
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Abstract Three-phase transformer less inverter is widely used in lowpower photovoltaic (PV) grid-connected systems due to its small size, high efficiency and low cost. When no transformer is used in a grid connected photovoltaic (PV) system, a galvanic connection

Environmental Impact Assessment for an Absorption Heat Transformer
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Abstract This study presents the environmental impact assessment of an absorption heat transformer designed to recover 1 kW of thermal energy from each 2 kW of waste heat supplies. The net contribution of the heat transformer is a load avoided of 0.665 kg CO2

Overcurrent Protection of Transformer by incorporating IDMT function with the help of Arduino Uno Microcontroller
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Abstract–Power transformer is an important and vital part of the electrical power system, there protection and continuous monitoring is very crucial for an uninterrupted power supply. There are various types of relays available for protection of transformer, one of the relay

A Modular Bi-Directional Power Electronic Transformer
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Abstract This paper presents a topology of a modular power electronic transformer (PET) and the control scheme is proposed. This PET consists of a cascaded H-Bridge rectifier on the primary side, a high-frequency DC/DC conversion cell in the center, and a cascaded H

Microbial Contamination of Electrical Power Transformer Oil Obtained from Onitsha, Nigeria
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Abstract Microbial contamination of in-use and unused electrical power transformer oils obtained from Onitsha, Nigeria was studied using cultural techniques. The average bacterial and fungal counts of the in-use oil were 1.2 x 102 cfu/ml and 0.7 x 102 cfu/ml respectively

Using the Complex Values of the Frequency Response to Improve PowerTransformer Diagnostics
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Abstract:Frequency response analysis (FRA) is a well-known technique for detecting the mechanical defects inside a power transformer. There are different methods to interpret the FRA results, and one of them is using the numerical indices. Majority of the indices

Effect of Leakage Current in the PV Transformer-Less Inverter Topology
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Abstract: The Photovoltaic (PV) is well known and becoming popular due to cost-effective as well as easy operating features especially in transformer-less inverter-based grid-tied distribution generation systems. Photovoltaic (PV) grid connected converter without

A Review: Transformer Protection for Magnetizing Inrush Current and Different Protection Schemes
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Abstract-The power transformer is one of the most vital links in a power system. Because of its relatively simple in construction, it is highly reliable piece of equipment. This reliability, however, requires proper design methodologies, annual overhauling and different

High Selectivity Coupled Line Impedance Transformer with Second Harmonic Suppression
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Abstract This paper presents a design of an impedance transformer (IT) with high frequency selectivity characteristics. The frequency selectivity can be controlled by even-and odd- mode impedance of a shunt coupled transmission line (TL). For experimental validation, a

Design Considerations of Resonant Network and Transformer Magnetics for High Frequency LLC Resonant Converter
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Abstract–This paper proposes the design considerations of resonant network and transformer magnetics for 500 kHz high switching frequency LLC resonant converter. The high power density can be effectively achieved by adopting high switching frequency

Transformer Winding Deformation Analysis using SFRA Technique
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Abstract The sweep rate response analysis is wide used technique for establish veiled fault and circumstance observance of power electrical device. The action is administrated by provide a coffee voltage signal of changeable frequencies to the electrical device

Photovoltaic (PV) Panel to Transformer-Less Inverter Topology: A Review Paper
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ABSTRACT Environmental friendly energy system is going to develop compared to convectional primary energy due to energy security problems. As the cost of solar energy is zero, the demand of solar energy is gradually increased in different purposes such as

Novel Detection Method of High Voltage Power Metering Circuit Fault based on Electric Energy Meter Phase and Voltage Transformer
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Abstract The basic structure of the electromagnetic induction type voltage transformer is the core and primary, secondary winding. Characteristics of capacity are small and relatively constant. This paper introduces the application of electric energy meter, including two

ANALYSIS OF SOLID STATE TRANSFORMER IN MICROGRID SYSTEM FOR POWER MANAGEMENT AND POWER QUALITY IMPROVEMENT
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Abstract: In this paper, the reduction of multiple reverse conversions in an individual AC or DC microgrid is proposed through SST. It also facilitates connections to variable renewable AC, DC sources and loads to power systems. In the present work power management and

Steady State Analysis for Power System of HSR with Active Transformer
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Abstract–In this paper, new electric railway feeding system which has active transformer is modeled for evaluating the steady state analysis using PSCAD/EMTDC. Equivalent models including power supply, feeder, train and transformers are proposed for simplifying the

Examination of a split transformer arrangement for the inductive link of contactless power transfer systems
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Abstract. In this work, a split transformer topology is proposed for use in a wireless electric vehicle charger. The topology presents desirable characteristics concerning minimization of the air gap, easiness of alignment, weight and cost. The coupling coefficient of the system

Development of ANN and AFIS Models for Age Prediction of in-ServiceTransformer Oil samples
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Abstract Power transformer is one of the most important and expensive equipment in electrical network. The transformer oil is a very important component of power transformers. It has twin functions of cooling as well as insulation. The oil properties like viscosity,

Transformer-Less UPFC for Wind Turbine Applications
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In this paper, an innovative technique with a new concept of transformer-less unified power flow controller (UPFC) is implemented. The construction of the conventional UPFC that consists of two back-to-back inverters which results in complexity and bulkiness which

Winding temperature prediction in split-winding traction transformer
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Abstract: Incombustible features of resin make multiwinding dry-type transformers suitable for use in traction systems. Nevertheless, due to resin's heat transfer property and the special structure of traction transformers, temperature distribution in traction transformers

Voltage Unbalance Reduction of a Local Transformer Area with Domestic Asymmetrical Inverter and Optimal Control Design
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Abstract The three-phase unbalance problem can introduce additional losses in distribution networks due to both negative and zero sequence components, which leads to inefficient power consumption and increased CO2 emission of low voltage transformer area,

Multiband RF Low Noise Amplifier (LNA) base on Multi section ImpedanceTransformer for Multi frequency Application
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Abstract In this paper, multiband RF low noise amplifier (LNA) is designed and evaluated. This LNA has a center frequencies 0.95 GHz for GSM, 1.85 GHz for WCDMA, and 2.45 GHz for WLAN application. In order to work on multifrequency, this paper proposed the use of

Analysis of the Different Topologies of Loose Coupled Rotating Transformerin Contactless Excitation System
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Abstract There are air gap and machining difficulty for loose coupled rotating transformer in contactless excitation system (CES). The coupling coefficient is relatively small compare with traditional transformer at the same time. There are several problems in the CES, such as

Investigation of MEMS piezoelectric transformer with PVDF thin layer
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Abstract. This paper presents the results of experimental work on the thin piezoelectric polyvinylidene fluoride (PVDF) film, which is used as piezoelectric transformer. The piezoelectric PVDF film was deposited by spray deposition technique on flexible

Monitoring and Controlling of Distribution Transformer using PLC
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Abstract:The Embedded system isdesignedand developed for monitoring and controlling electrical appliance mainly Transformers using PLC,. Distribution transformers of substation are one ofthe most important equipment in power system network. Because of, the large

Voltage dips compensation via boosting transformer cascades
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Abstract The article represents research results in connection with the oil production plant power line modes. Problems are disclosed, which are related to the voltage drops as result of starting powerful engines at the ends of both radial and radialbulk types of power lines.

Design and Implementation of Low Cost Distribution Transformer Monitoring System for Remote Power Electric Powergrid
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Abstract: In normal ways all the Industrial or Electrical machineries are controlled by the manual operation. Hence there is step by step progress but most of the time there is not actually instant co-operation between system and operator in case of emergency or fault

A Novel Transformer-less Voltage Quadruple with Low Switch Voltage Stress Solar DC-DC Converter by using Fuzzy Logic Controller
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ABSTRACT-In this paper, a novel transformer-less adjustable voltage quadruple solar dc–dc converter with highvoltage transfer gain and reduced value of settling time semiconductor voltage stress by using (FLC) fuzzy logic controller is proposed. The proposed topology

Monitoring Parameter of Distribution Transformer by using XBEE Technology
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Abstract-The distributed transformers monitoring system (DTMS) based on XBEE technology is developed for monitoring and record the parameter like oil level, temperature of distribution transformer. The system consists of PIC microcontroller for handling the sensor

Electrical Circuit Design of a Coupling Transformer with a Virtual Air Gap
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Abstract–The Dynamic Voltage Restorers composed of a coupling transformer and a Voltage Source Converter are efficient series devices to improve the power quality of electrical grids. For the proposed coupling transformer, an embedded magnetic bypass

Distribution Transformer Monitoring System Based On Zigbee Technology
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Abstract–Transformer is the valuable link of the transmission of electricity all over the world. If any fault causes in transformer it will reduce the life of it, this will causes to need of continuous monitoring of various transformer. Distribution transformer remotely monitoring

Diagnosis of power transformer incipient faults using electronic nose
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Abstract Power transformers are very expensive entities of electrical power systems. Since repairing and maintaining health of a transformer is very difficult and time consuming, their failure will have big negative impact on the system. Thus, any information regarding

Analysis of Geomagnetically Induced current in Transformer
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Abstract:Geomagnetically induced current (GIC) is harmful to the power system mainly on the transformer. Also, it causes serious problems to the transformers. It is DC bias current produced due to the effect of solar storm on earth. As GIC enter in the transformer through

Transformer Monitoring System Using GSM Module
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Abstract: The aim of the project work is to protect the distribution transformer or any other power transformer, burning due to the overload. Normally most of the transformers are burning because of over load; hence by incorporating monitoring and control circuits, life

TOWARDS A TRANSFORMER TRANSIENT MODEL AS A LUMPED-DISTRIBUTED PARAMETER SYSTEM
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Abstract-A topological model of three-phase three-limb transformer applicable for low- frequency transients is presented. The processes in the core limbs and yokes are reproduced individually by means of a dynamic hysteresis model. A method of accounting

Analysis Of 3- Multi-Pulse Ac To Dc Converter Through Zig Zag Transformer
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Abstract: This paper deals with the reduction of Total Harmonic Distortion (THD) by using Multi-pulse AC to DC Conversion technique. The three-phase multipulse AC to DC conversion system have a phase-shifting transformer and a three-phase source. Every

A Balance Compensation Method for Traction Substation Based on Converter Power Compensation and Balance Transformer in Chinese high-speed railway
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Abstract: According to the characteristics of the balance transformer in traction substation, a two-phase current compensation method aiming at balance transformer is proposed on the basis of the power balance device and the three-phase instantaneous reactive power

Research on Typical Discharge Mode of Power Transformer
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Abstract: Five kinds of oil-paper insulation models are designed and produced to simulate typical defects of power transformer. Plenty of discharge spectrogram and discharge impulse waveform are obtained by using digital PD measuring system. PD features of different

CASE STUDY OF SHELL-TYPE POWER TRANSFORMER TANK VIBRATION IN DIFFERENT LOADING CONDITIONS
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Abstract. Vibration measurements on power transformer tanks have been used to monitor their technical condition and detect internal failures for already 30 years, but the health grade system for vibration measurements of power transformers has not been yet

Determination of the amount of heat generated by the inrush current in the windings of a superconducting transformer
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Abstract. The text presents an analysis of the amounts of heat generated by the inrush current flowing through the primary winding of a superconducting transformer. A formula to describe the inrush current for the winding in the resistive state is derived. Then, a formula

Determination of the basic parameters of the high-frequency planar transformer
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Abstract. The study is dedicated to the experimental and analytical determination of the parameters of the p-shape circuit models of high-frequency two-winding planar transformers used in various types of power electronic converters. For determining the winding

Smart Energy meter using Power Factor Meter and Instrument Transformer
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ABSTRACT Electric Supply office sends the consumption bill for the previous month depending on the consumption as indicated by the conventional electric meter placed in a domestic premises or business place. The consumer then going to the electricity office,

Transformer-less DIDO DC-DC Converter for EV's
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Abstract:A transformer-less dual input dual output (DIDO) dc converter is proposed in this paper. This converter finds its application in fields of hybrid power system and hybridization of energy sources for electric vehicles. Supply of the output loads, charging and

Hybrid, multi-megawatt, medium frequency HVDC transformer for offshore wind turbines
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Abstract As the offshore wind industry moves further offshore HVDC transmission is becoming increasingly popular. HVDC transformer substations are not optimised for offshore industry however, increasing costs and reducing redundancy. A modular HVDC

Mitigation of DC Component and Suppression of Inrush Current for PowerTransformer Protection
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Abstract When a transformer is energized, magnetizing inrush current arises due to short- term over fluxing in the transformer core. The quantity of inrush current may be as high as ten times of transformer rated current which causes mal operation of differential protection

Design of Transformer-Less Sliding Mode Controlled Resonant DC-DC Converter
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Abstract: Renewable energy generation interfaces are widely used for their clean energy; these renewable interfaces require a power electronic interface to condition their power as the sources are affected by environmental conditions. This paper presents a Transformer-

DIRECT AC-AC CONVERTER WITH HIGH FREQUENCY LINK TRANSFORMERUSING SINUSOIDAL PWM TECHNIQUE
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Abstract-A direct AC-AC converter based on high frequency link concept is proposed to reduce the harmonics present in the output current when connected to the non linear loads in the distribution system. The proposed system converts one unregulated sinusoidal

On the study of the layer-short in the winding of power transformer in running at the attack of
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It is well known that there occurs the AC layer-short in the winding of transformer in service, when once the impulse voltage passed through the deteriorated layer in the transformer winding. It is difficult to examine whether the AC layer-short appeared or not, because the fault

Power Transformer Inrush Current Detection Harmonic Sharing In Differential Relay Protection
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Abstract-Differential relays protection is one of the most widely used methods for protecting power transformer against internal faults. The technique is based on the measurement and

MOISTURE, AND AGEING AS AN OPERATING PA-RAMETERS CONDITIONING RELIABILITY OF TRANSFORMER COOLING SYSTEM RODZAJ CIECZY,
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Abstract In this work, 1500VA variable output step down transformer was designed and constructed. The voltage was stepped down from 230V AC supply to 12V and 24V rectified

Concept Design and Characteristics of 500 kV HVDC Transformer
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SUMMARY In a High Voltage Direct Current (HVDC) system, the HVDC transformer serves several functions, such as act as a galvanic barrier between the AC and DC systems to prevent the DC potential to enter the AC system, voltage transformation between the AC

Design and Implementation of Remote Condition Monitoring Technique ofTransformer using Data Acquisition System
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Abstract In this paper remote condition monitoring system is developed using data acquisition system which senses different parameters and communicated to the remote end using internet. The economical aspect of distribution transformer with remote condition

Artificial Neural Network Approach to Dissolved Gas Analysis for Interpretation of Fault in Power Transformer
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Abstract:Power transformer is most crucial equipment in the power system. Monitoring the behavior of transformer is necessary to avoid catastrophic failures, costly outages. Dissolved Gas Analysis (DGA) is a widely used technique to estimate the condition of oilimmersed

Enrichment of used Transformer Oil using Activated Bentonite and Comparison of Various Transformer Oils with Vegetable Oil
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Abstract: The transformer is basic unit of distributed power generation system. The transformer uses oil as insulating medium to prevent the arcing, suppress the corona and improve the cooling. Traditionally the mineral oils are used as insulating oil for

A Transformer Combined Quadrature Switched Capacitor Power Amplifier in 65nm CMOS
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Abstract:This paper presents a transformer combined, quadrature switched-capacitor power amplifier (Q-SCPA) that amplifies in-phase (I) and quadrature (Q) signals separately and combines them in a power-combining transformer. The unit SCPA utilizes a class-G

Load Trimming scheme for Overload Protection of Power Transformer
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Abstract The paper presents a microcontroller based automatic scheduling system for the operation and control of distributed energy resources connected to electrical power system. We have proposed a new structure of power system network which has a connection

COMPUTATION OF ELECTRICAL STRESSES AND FAULT DIAGNOSIS INTRANSFORMER WINDING
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Abstract: It is necessary for the transformer designers to know the electrical stresses at all parts of the windings as accurately as possible at the design state itself so that they may select an efficient winding and insulation structure. In this paper a proper winding model

SIMULATION OF THE REMANENCE INFLUENCE ON THE TRANSIENT STATES IN A SINGLE-PHASE MULTIWINDING TRANSFORMER
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Abstract–This paper presents the mathematical model of a single phase multiwinding transformer taking into account magnetic hysteresis phenomenon based on the feedback Preisach model (FPM). Experimental studies consisted of the discharge of the capacitor

Power Quality Improvement in Modified Solid State Transformer System Using Statcom
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Abstract:Power quality is a major issue of loads in the distribution system used in industrial and domestical appliances. In this work, we proposed a modified solid state transformer system using statcom to improve the power quality of loads in the distribution system. The

INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES RESEARCH TECHNOLOGY PURIFICATION OF TRANSFORMER OIL in PT. PJB UP PAITON
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ABSTRACT The purpose of this paper is to describe the filtration or purification of transformer oil. One of the main equipment in coal-fired power generation unit is transformer. When the transformer fail to operate properly, the continuity of distribution system become

Power Transformer Fault Diagnosis Based on the SOM Network Combined with the BP Neural Network
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Abstract By analyzing the bottleneck facing the current power transformer fault diagnosis model, this paper puts forward a power transformer fault diagnosis model. The SOM model is introduced to optimize the training samples collected and to eliminate interference

Influence of Zero-Sequence Removal on Transformer Fundamental Quantity Monitoring
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Abstract:This paper presents results of a simulation study to quantify the effect of zero sequence removal on the accuracy of transformer fundamental quantities estimated from ordinary voltage and current signals by linear fitting selected quantities as a function of

A Comprehensive Approach to Current Transformer Field Diagnostics
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Abstract Current transformers (CT) serve as a critical and essential interface in the world of electrical power. The role of a CT, at first glance, may appear to be a simple one but, CTs function as one of the most important components of the electrical system infrastructure.

SIMULATION AND DESIGN OF TRANSFORMER LESS SINGLE PHASE SOLAR INVERTER
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ABSTRACT In this article, solar energy is converted into electrical energy ineffective cost. The components of these solar systems which are mainly used are solar cell, dc to dc boost converters and inverters. Topology used for inverter is sine wave pulse width modulation

Review on Incipient Fault Diagnosis for Power Transformer Using Dissolved Gas Analysis Based On Fuzzy Three Gas Ratio Method
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Abstract: Dissolved Gas Analysis is useful method to detect incipient faults in transformer [1- 4]. three ratio method is widely used for detection of incipient fault. When more than one fault exists in a transformer, these methods sometimes fail to diagnose. IEC Three Ratio

Optimized Design Layout of Transformer Manufacturing Plant
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Abstract-This paper describes study and redesign of transformer manufacturing plant with the help of various techniques and design software. Initially thorough study of the sub- assemblies in main assembly line was made. For each assembly processes the assembly

ON LINE DETECTION OF PPM LEVEL MOISTURE IN HIGH VOLTAGE TRANSFORMEROIL USING NANOPOROUS CERAMIC SENSOR
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ABSTRACT Nanoporous -alumina thin films were prepared by sol-gel route using PVA as pore former. XRD, FESEM and TEM studies confirm the phase purity of the prepared materials. The adsorption studies (BJH) show the formation of pores having average

Analytical Determining Of The Steinmetz Equivalent Diagram Elements Of Single-Phase Transformer
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Abstract: This article presents to an analytical calculation methodology of the Steinmetz Equivalent Diagram Elements applied to the prediction of Eddy current loss in a single- phase transformer. Based on the electrical circuit theory, the active and reactive powers

SYNTHESIS AND THERMO-PHYSICAL CHARACTERIZATION OF GRAPHENE BASED TRANSFORMER OIL
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Abstract Transformer oils serve as coolants and an insulation medium to avoid overheating. Due to low thermal conductivity of transformer oils which may result in overheating and hence nanoparticles are introduced to overcome this challenge. In this research,

Power Transformer Protection using MATLAB
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Abstract: Power transformer is most vital component of any plant. Power transformer works on mutual induction ie input power is equals to output power. Security of power transformer is a concern issue in the past few decades. There are number of algorithm made to secure

FITTING A SIMPLE TRANSFORMER MODEL TO HFSS SIMULATION RESULTS
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Page 1. ALSO PUBLISHED ONLINE: FEBRUARY2016 www.highfrequencyelectronics.com Ideas for today's engineers: Analog · Digital · RF · Microwave · mm-wave · Lightwave FITTING A SIMPLE TRANSFORMER MODEL TO HFSS SIMULATION RESULTS IN THIS ISSUE:

Limiting Transformer Overload on Distribution Systems with High Penetration of PV Using Energy Storage Systems
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Abstract:In this work, different strategies to limit the over-loading of the transformer in a distribution system are investigated and the solutions based on installing different number of energy storage systems (ESS) of different size and at different locations are devised. In

A High Efficiency Method to Suppress Transformer Core Unbalancing Issue in Digital Controlled Phase-Shifted Full-Bridge Converter
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Abstract A high efficiency method is proposed to suppress magnetic core unbalancing issue in phase-shifted full-bridge (PSFB) converter. Compared to conventional solutions such as peak current mode (PCM) control or adding DC blocking capacitance, proposed method

Faults in Transformer Winding and Probing their Occurrence by S-Transform and RBF Neural Network Technique
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Abstract Now a days significant enhancement of certainty, reliability and economics of the power transformer is an important topic in power system engineering because among all equipment as for expedition used in electrical systems power transformer is one of the

The influence of radiators construction on vibroacoustic measurement of a power transformer
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Abstract. The paper presents an example of transformer tested with complementary tests methods: Frequency Response Analysis and Vibroacoustic Measurement. Methods applied together allow for higher quality of mechanical condition of transformer active part

Estimation of Loss of Life due to Hot Spot Development in Power Transformerusing MATLAB
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Abstract:The opportunity for the research in thermal modeling of power transformer is to estimate their loss of life due to overloading by employing the winding hot spot temperature (HST) and by carrying out aging studies based on heat transfer theory. This is facilitated

Application of GIS and Improved PSO Algorithm in Site Selection ofTransformer Substation
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ABSTRACT According to the existing substation locating and sizing method due to the neglect of geographic factors which affect the accuracy of practical application, this article puts forward a method of substation locating and sizing based on geographic information

3D MAGNETIC AND THERMAL FIELDS FOR THE TRANSFORMER WITH HOMOGENISED AMORPHOUS C-CORE UNDER HIGH FREQUENCY
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Abstract–The analysis of the 3D magnetic and thermal fields for the 1-phase amorphous transformer with f= 1 kHz operating frequency, has been presented in this work. A homogenization of the laminated C-core, with equivalent electrical conductivity, has been

INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES RESEARCH TECHNOLOGY FAULT DEVELOPED IN POWER TRANSFORMER: A REVIEW
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Power transformer is major power system equipment. Their reliability not only affects the electric energy availability of the supplied area, but also affects the economical operation of a utility. Determining transformer condition is useful for making short-term decisions regarding

Waveform Relaxation-Newton Method to determine Steady State Operation: Application to three-phase transformer
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Abstract–This paper presents a 3-D finite element method to determine the steady state operation for magnetostatic problems coupled with electrical circuit equations. For this purpose, the waveform relaxation method combined with the Newton method (WR-NM) is

Protection of power transformer by using PIC microcontroller
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Abstract:This paper describe the design and implementation of an Automatic method of protecting transformer as an PIC microcontroller based protection technique. The aim of this paper is to provide an alternative, effective, efficient and more reliable method of

DESIGN OF A CONTROLLED COOLING SYSTEM FOR A THREE-PHASE POWERTRANSFORMER WITH SUPPORT OF RENEWABLE ENERGY
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Abstract: The national electricity supplier in South Africa (Eskom) struggles more and more each year in supplying sufficient amount of power. This is partially due to residential consumers that use appliances that require more power. This results in transformers that

Numerical study of the cooling capacity of several alternative liquids in zig-zag cooling system of a power transformer
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Abstract. Mineral oil is the usual coolant of the power Transformers. Nonetheless, the high risk of fire of this liquid due to its low ignition point and its scarce biodegradability has promoted the development of dielectrics alternative fluids with better physical-chemical

Transient Recovery Voltage at Transformer Limited Fault Clearing H. Kagawa A. Janssen Tokyo Electric power Company Liander NV Japan the Netherlands
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SUMMARY Severe Transient Recovery Voltage (TRV) after the current interruption may appear when a fault occurs in the immediate vicinity of a power transformer without any appreciable capacitance between the transformer and the circuit breaker. These faults are

82: Thermodynamic optimization for central heating system by using industrial waste heat through absorption heat transformer
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Urban heating energy consumption in northern China accounts for 40% of total building energy consumption. Meanwhile there are large quantities of low grade waste heat discharged into the environment during industrial processes in northern China. Utilizing

Design of Three Phase Core Type Distribution Transformer using Matlab
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An empirical basis based on experience of the designer was previously adopted for engineering design. Later on, with the development of analytical tools and mathematical modeling the engineers began to apply them to design problems. This approach to design

SIMULATION OF RESIDENT INTERNAL STRAINS OF WELDED JOINTS OF HERMETICALLY SEALED TRANSFORMER TANKS BY TRANSIENT THERMAL
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Abstract Hermetically sealed transformer tanks which are made of low-alloy carbon steels with metal Active Gas Welding Method contains critical welded joints about fatigue loadings of transformer tanks in service life. In this proceeding paper, four samples of critical

A Novel Proposed Model to Diagnose Incipient Faults of Power TransformerUsing Dissolved Gas Analysis by Ratio Methods
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Abstract:Condition Monitoring plays a vigorous role in asset management strategy. Power Transformers are most important and critical component in electrical power transmission and distribution. To have a reliable electricity supply it is necessary to give considerable

A Case Study of Transformer Protection from Lightning and Switching Impulses using PSCAD Software.
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Abstract:The main objective of the paper is to build the circuit in the PSCAD software and observe the results for the lightning impulse and the switching impulse. The paper presents the simulation results obtained in the software. When a high impulse lightning strikes

Thermal simulation of the Effect of Windings Arrangement in a Cooled PowerTransformer
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Abstract: The outcome of the study will be the determination of the effects of modifying geometrical parameters of a real 33.6 MVA power transformer by means of a simplified model based on CFD methods. This will help the designers to prove that power

Dissolved Gas Analysis of Transformer oil using Adaptive Neuro-Fuzzy Inference System
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Abstract:In this paper, Adaptive Neuro-Fuzzy Inference System (ANFIS) has been developed for analysing various incipient faults occurring in oil immersed transformer. By using dissolved gas analysis (DGA) we can effectively monitor condition of oil immersed

GENERATION SYSTEM OF A GRID-CONNECTED POWER CONVERTER WITH NEGATIVE GROUNDING WITHOUT USING TRANSFORMER
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Abstract:This paper proposes a novel transformer less grid connected power converter with negative grounding for a photovoltaic generation system. Moreover, PV systems convert light directly into electricity and shouldn't be confused with other technologies, such as

Mathematical analysis and realization of an application specific DC-DC converter using Fly-back transformer for charging of liquid sprays
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Abstract:In order to increase the yield and for protecting the crops from pest attacks, pesticide spraying techniques are used in agricultural fields. The most promising and highly efficient technique for pesticide spraying has emerged with the advent of electrostatic

Comparison of PCCC Performance in Presence of Mercaptans and DBDS Sulfur in Transformer Oil Using Ø-tN Technique
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Abstract: Paper–oil insulation is widely used in transformers. The reactive sulfur forms copper sulfide and dispersing in oil causes the reduction in insulation of the transformer. It is reported that during life cycle of transformer, paper and pressboard insulation undergoes

Determining the potential field within a square transformer
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ABSTRACT This paper deals with determining a field of stationary potential in a transformer with square plane section, with a side measuring 4 and divided at the center by a square which side measures 2. The problem consists in solving a Laplace equation with

Mitigation and Analysis of Very Fast Transient Over Voltages of Transformerin 765 kV Gas Insulated Substation by Wavelet Transform
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Abstract-Switching operations in a gas insulated substations generate very fast transient over voltages (VFTO) which are dangerous for the transformer and the system insulation because of their short rise time. Under special circumstances the terminal over voltages

Optical high voltage breakdown prediction using thermal lensing effect intransformer oil
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Abstract. We describe an optical system to monitor microscopic pre-breakdown events in liquid insulation. The system has successfully demonstrated its ability to predict high voltage breakdown in transformer oil. A simple theory based on a thermal lens build up between

DETECTION OF MECHANICAL FAULTS ON TRANSFORMER WINDING USING FREQUENCY RESPONSE ANALYSIS (FRA)
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Abstract:Frequency Response Analysis (FRA) is the only reliable technique often called as tool for determining mechanical faults in transformer winding. There are many techniques available for the electrical fault detection. But FRA is the only tool for detection of internal (

Remote condition Monitoring Technique of Transformer using single board computer
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Abstract: In this paper remote condition monitoring system is developed using single board computer and data acquisition system which senses different parameters and communicated to the remote end using internet. The economical aspect of transformer

Classification and Localisation of Multiple Partial Discharge Sources Within a High Voltage Transformer Winding
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Abstract:Partial discharge (PD) analysis is widely adopted for assessing the condition of the insulation systems within high voltage (HV) transformers. Different PD sources have different effects on the insulation condition of HV transformers. In a typical field

Differential Transformer based Design of Bandpass Filter for 1.8 GHz
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Abstract This paper represents Bandpass filter using FR4 substrate based on differential transformer. The transformer is full differential symmetric made by two intertwined spiral inductor. This design is located at 1.8 GHz center frequency. It passes frequency from 1.68

Short-Term Load Forecasting of a Distribution Transformer using Self-Organizing Fuzzy Neural Networks
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Abstract:The distribution transformer load forecasting is very essential in the control of future smart grids and economical interfacing of Distributed Resources (DRs) to distribution networks. A distribution transformer connects DRs to the main grid. Exact distribution

A Novel Digital Non-electrical Protection for Power Transformer Based on Internal Pressure Characteristics
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Abstract:Power transformers play a very critical role in electrical energy transmission. Abnormal performance of transformers would seriously affect the reliability and stability of power system. Non-electrical gas relays are usually used as a main protection of power

Analysis and Prototyping of Multicellular DC-DC Transformer for Environmentally Friendly Data Centers
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Abstract: A multicellular DCX (dc-dc transformer) using unregulated cell converters has been proposed for the environmentally friendly data centers. The high speed cell converter with the switching frequency over MHz behaves as an ideal transformer, and this behavior