Papers by Chiragkumar Parekh
Journal of Xidian University, 2024
The seamless and efficient process of 3 phase induction motor (IM) is crucial for modern industri... more The seamless and efficient process of 3 phase induction motor (IM) is crucial for modern industries. This paper begins by reviewing traditional time-domain and frequency-domain analyses of trembling and current signature used toward diagnose various IM faults, using data from dissimilar faulty IMs in a laboratory setting. It then discusses the benefits and challenges of these conventional methods. Following this, the paper summarizes current research and advancements in signal-based automation techniques for condition monitoring, focusing on detecting and diagnosing different electrical and mechanical faults in IMs. Recently, artificial intelligence (AI) techniques have been increasingly utilized for IM and other machinery fault diagnosis. The paper provides a detailed review of advancements in AI-based fault analysis, including trendy methods, which are being integrated with traditional monitoring approaches. The focus is primarily on techniques developed in the past decade. The review covers system signals, conventional and advanced signal processing methodologies, and emphasizes selecting effective arithmetical features, AI methods, & associated teaching and testing strategies for IM fault diagnostics. In addition, the paper talk about current advancement, identifies research gaps, and explores outlook directions in IM fault monitoring and analysis.
International Conference on Science, Engineering and Technology (ICSET 2022), 2022
The quality of tangible electrical power produced by hybrid Renewable Energy System (h-RES) is sc... more The quality of tangible electrical power produced by hybrid Renewable Energy System (h-RES) is scrutinized in this novel article. Additionally, solar-wind-hydro based h-RES is interconnected with unstable nonlinear load. Power quality (PQ) of the proposed h-RES may diminish due to its connection with main electrical grid which includes variable non-linear and linear loads. To trim down this PQ issue, one of the CPD (Custom Power Device) can be used and most suitable CPD for this novel system is UPQC (Unified Power Quality Conditioner). This research work brings down harmonic distortions in voltage and current waveform generated from the proposed system by utilizing of UPQC. Moreover, voltage stability and transient state stability during various fault conditions are also enhanced in the same system. In solar-wind-hydro based h-RES, input energies are unpredictable and connected load on output side is also inconsistent & non-linear. This arrangement is similar as actual electrical grid system.
Journal of Xidian University , 2024
Power congestion management is a critical aspect of maintaining the stability and efficiency of e... more Power congestion management is a critical aspect of maintaining the stability and efficiency of electrical grids, particularly in the face of increasing demand and the integration of renewable energy sources. This review paper explores the role of Flexible AC Transmission Systems (FACTS) devices in alleviating congestion within power systems. Beginning with an overview of the challenges posed by congestion, the paper introduces the concept of FACTS devices and their potential to enhance grid flexibility and reliability. Various approaches to power congestion management utilizing FACTS devices are discussed, including voltage control, impedance management, and power flow optimization. Additionally, the paper examines the effectiveness of FACTS devices in different grid scenarios and their integration with other grid control technologies. Furthermore, it highlights the benefits and limitations of FACTS devices in mitigating congestion and improving grid performance. The review concludes with insights into future research directions and the potential impact of FACTS devices on the evolution of power systems..
The research paper explores the integration of a Solar Photovoltaic (SPV) system with the IEEE 14... more The research paper explores the integration of a Solar Photovoltaic (SPV) system with the IEEE 14 Bus network to harness renewable energy. During fault conditions, the interconnection is assessed. Specifically, IEEE 14 Bus system's Bus number 2 is linked to both a Solar Photovoltaic (SPV) system and a Salient Pole Synchronous Generator. This arrangement is necessitated by the fact that the remaining buses serve as synchronous condensers and a slack bus, leaving only Bus 2 amenable to modification. The IEEE 14 Bus system contains three synchronous condensers, essential for maintaining power factor within the system. Notably, both the Salient Pole Generator and SPV have identical power capacities. The integration of SPV into the IEEE 14 Bus system reduces the total rotational inertia on Bus 2. Consequently, during fault conditions near Bus 2, all generator output parameters are adversely affected. To mitigate these disturbances, the interconnection of a Virtual Synchronous Generator (VSG) on the same bus is employed. The passive filters are incorporated into the VSG to reduce harmonics consequence.
This paper explores the assessment of mechanical integrity and winding deformation in power trans... more This paper explores the assessment of mechanical integrity and winding deformation in power transformers using Sweep Frequency Response Analysis (SFRA), a non-invasive diagnostic technique. SFRA evaluates the frequency response of transformer windings, enabling the detection of internal issues like winding movement, core displacement, and structural deformations caused by short circuits, aging, or mechanical stresses. By applying an input signal across a broad frequency range, SFRA generates a unique response signature that reflects the transformer's internal condition. Deviations from baseline or reference responses indicate potential mechanical deformations. The study involves systematic SFRA testing on transformers subjected to different stress conditions to analyze the variations in frequency response. Results demonstrate SFRA's sensitivity to mechanical shifts and its effectiveness in early fault diagnosis, potentially extending transformer life and reducing unexpected failures. The findings advocate for SFRA as a valuable tool in predictive maintenance and reliability management for power transformers.
Journal of Instrumentation Technology and Innovations
Transformer is the most costly and important component of power system. It is more than 100 years... more Transformer is the most costly and important component of power system. It is more than 100 years old technology. Technology has not changed drastically but the challenges are continuous increase in size and rating , competition in global market , accurate prediction of performance parameters , updating of design baseline and many more. Transformer design optimization (TDO) is a complex task in which designer have to ensure that the imposed specifications are met, while keeping manufacturing costs low. The research associated with design optimization is therefore more restricted involving different mathematical optimization methods. This paper presents review of research and development in transformer engineering and design optimization for the past 40 years based on more than 100 published papers, latest 10 transformer books and various national and international standards. Keywords: transformer design optimization (TDO), magnetic circuit, no load losses, load loss cooling, finite element method (FEM) Cite this Article Parekh C, Kotwal C, Upadhyay H. A review on transformer design and innovative aspects of optimization. Journal of Instrumentation Technology and Innovations. 2016; 6(1): 10–22p.
Employing Sweep Frequency Response Analysis for Diagnosing Condition of Power Transformer
The power transformer being very expensive plays a tectonic role in power system. Reliability is ... more The power transformer being very expensive plays a tectonic role in power system. Reliability is apogee in power system. Any failure fringing power transformer may lead to substantial monetary loss depending on how much duration it is out of service. On-line monitoring and prognosis of power transformer helps the associated delegate to take decision on subject of maintenance, replacement or continuity of its operation. From accessible vivid methods for condition monitoring of power transformer, the potent key tool for diagnosing the verdure of the transformer and determining propitious condition for service is Sweep Frequency Response Analysis. Sweep Frequency Response Analysis (SFRA) helps to detect different abnormalities residing inside transformer without detanking it. In these paper, we have discussed prosecution of SFRA, principle governing SFRA, its facets, detection of faults by SFRA, various frequency response obtained by SFRA tests and rules for repeatability. Keywords: Po...
Optimum Circumscribing Circle Division Method for Getting Maximum Fill Factor in Transformer Core
Journal of Electronic Design Technology
As far as the optimum design of transformer is concerned, researchers generally concentrate on mi... more As far as the optimum design of transformer is concerned, researchers generally concentrate on minimizing cost, no load and load losses etc. by choosing K-factor, Flux density, Current density etc. as design variables. But, the design of core has remained an unexplored area. Transformer manufacturing industry uses traditional technique to find out the core design dimensions. However, in that method, the fill factor for the desired number of steps is not maximized. The advantages of maximizing the fill factor includes reduced diameter and hence reduced copper material and associated cost and losses, increased efficiency, etc. In this paper, a new method, referred to as Optimum Circumscribing Circle Division Method (OCCDM), is suggested to maximize the fill factor for the desired number of steps in the transformer core.
Challenges and Remedies for Stray Loss Prediction and Reduction for Power Transformer
Current Trends in Signal Processing
Power transformer facilitates the bulk power transmission for long distance. Cost wise it is one ... more Power transformer facilitates the bulk power transmission for long distance. Cost wise it is one of the costliest objects of power system. This is the reason; their design has been a major concern and the subject of extended research. Nowadays customers are asking for highly efficient transformers in lower cost. That means, continual improvements, analyses and innovative techniques have to be adopted by designers and manufacturers. The stray loss analysis is one of the most challenging tasks ever been for a designer which may greatly support cost optimization process. Load losses in the transformer are formed due to ohmic resistance of windings plus other supporting losses. These supporting losses are stray losses which happen due to interaction of leakage field with nearby metallic components of transformer structure. The presented work is associated with the practical and simulation bases analysis, at both manufacturing and design stages for calculation, measurement and respective remedies of stray losses. A 3-D FEM analysis is carried out for power transformers to verify leakage flux and its interaction. Keywords: Transformer design, stray loss, FEM Cite this Article Chirag Parekh, Kotwal CD, Avni Parikh. Challenges and Remedies for Stray Loss Prediction and Reduction for Power Transformer. Current Trends in Signal Processing. 2016; 6(1):25–34
Estimation of Series- and Shunt-Capacitances of a Single-Phase Core-Type Transformer Windings
Estimation of capacitance is essential in order to understand the capacitive coupling in the wind... more Estimation of capacitance is essential in order to understand the capacitive coupling in the windings, and to assess the health of the transformer. The estimation of the series capacitance (Cs) of a transformer winding from the terminal data will be challenging due to the effect of interwinding capacitance (Cw) between the HV windings. It is essential to decouple the effect of Cw to measure series capacitance accurately. In this paper, an equivalent ladder circuit model of a single-phase, core-type transformer is considered and each HV winding is represented as an electromagnetically coupled lumped ladder circuit model. Initially, the high-frequency behaviour of the model is analysed. After that, a specific frequency is identified to capture the capacitive voltage distribution along the circuit model. Based on the voltage data, connections between specific locations are proposed such that the influence of the inter-winding capacitance is minimised. As a result, accurate estimation of Cs can be possible with minimum complexity. With the proposed methodology, it is possible to estimate the capacitances of any core-type transformer even if their design details are not available. The capability of the proposed method is demonstrated on electrically and magnetically coupled, physically realizable 4-section and 6section ladder networks of 1-phase, core-type transformers.
Trends in Electrical Engineering STM Journal, 2016
Transformer is one of the key equipment of the power system. Power rating of the transformers var... more Transformer is one of the key equipment of the power system. Power rating of the transformers varies from KVA to several hundreds of MVA. The transformer is an expensive equipment of the power system. Failures of transformer usually lead to substantial profit loss to the utility, potential environmental damage, explosion and fire hazards and expensive repairing or replacement costs; thus, it is desirable that the maximum service life of transformer is required. Condition monitoring of transformer can help to increase the life of the transformer and reduce the maintenance cost. On-line monitoring is the record of significant data of a transformer and analysis of data including the history of the transformer. In this paper, we present the different techniques adopted for condition monitoring of transformer.
Shodh Ganga, 2017
Power transformer is the utmost important and costliest component of the power system. The design... more Power transformer is the utmost important and costliest component of the power system. The design of a transformer can be optimized for its cost, no load loss, efficiency, weight, etc. However, the respective customer specifications have to be taken into account. Generally, researchers find optimum design by fixing several of the parameters. In this proposed work, besides K-factor and flux density, the geometry of winding conductor, number of axial and radial conductors and number of discs of LV as well as HV winding are also considered as design variables. The constraints are imposed on total cost, load loss, percentage impedance, efficiency, Winding Gradient, Tank deflections and no load loss. As the numbers of design variables are twelve, the problem cannot be solved by traditional optimization methods. So, Genetic Algorithm (GA), an efficient evolutionary algorithm, is used to optimize. Stray loss is extremely challenging factor while optimizing design. So 3D-FEM based analysis is carried out on same GA based transformer design. The design obtained was compared with the actual industrial design and found effective in terms of cost as well as efficiency.
This work comprises the excel based software development for Transformer design as per conventional mathematical formulas, Industrial code of practice and applicable national and international standards. The optimization methods like GA,PSO,TLBO and the engineering analysis method like FEM is considered for this research work. Self-developed Binary encoded GA,PSO and TLBO is applied to drive the transformer design optimization. The multi objective optimization technique is applied for this work to conclude transformer design which has low cost and high efficiency. 15 MVA 66/11 kV transformer design data is referred to develop software based program of Transformer design and respective TDO methodology. On the base of developed TDO, the real transformer of 10 MVA 66/11 kV has been developed and tested at NABL laboratory.
Current Trends in Signal Processing STM journals, 2016
Power transformer facilitates the bulk power transmission for long distance. Cost wise it is one ... more Power transformer facilitates the bulk power transmission for long distance. Cost wise it is one of the costliest objects of power system. This is the reason; their design has been a major concern and the subject of extended research. Nowadays customers are asking for highly efficient transformers in lower cost. That means, continual improvements, analyses and innovative techniques have to be adopted by designers and manufacturers. The stray loss analysis is one of the most challenging tasks ever been for a designer which may greatly support cost optimization process. Load losses in the transformer are formed due to ohmic resistance of windings plus other supporting losses. These supporting losses are stray losses which happen due to interaction of leakage field with nearby metallic components of transformer structure. The presented work is associated with the practical and simulation bases analysis, at both manufacturing and design stages for calculation, measurement and respective remedies of stray losses. A 3-D FEM analysis is carried out for power transformers to verify leakage flux and its interaction.
Master of Engineering Thesis GTU India, 2020
I have planned to investigate the various characteristics like Dielectric,
Overloading, Partial D... more I have planned to investigate the various characteristics like Dielectric,
Overloading, Partial Discharge (PD) etc. of mineral oil and Ester oil filled
power transformer. Mineral oil is the most commonly used insulating liquid
for transformer applications, and an extensive database of knowledge has
been accumulated over the years. Increased environmental, safety
performance and economic have led to the consideration of other oils for use as transformer insulating fluids. Esters have been used as dielectric liquids since the invention of oil filled transformers in the late 1980s. Both types of oils tested are commercial products and commonly used in transformers. A Partial discharge (PD) is localized dielectric breakdown of a small portion of a solid or fluid electrical insulation (EI) system under high voltage (HV) stress. The discharge may occur at any point in the insulation system that the electric field strength exceeds the breakdown strength of that portion of the insulation system. In transformers, the insulation system is comprised of the winding insulation material as well as the dielectric fluid. PD can occur in a gaseous (i.e.SF6), liquid (Mineral Oil –Ester Oil) or solid insulating medium (Press board, Craft Paper, Insulation etc). Insulation failures begin with and are characterized by small but detectable releases of energy or Partial Discharge. That means partial discharges are the first indication of insulation
Master of Engineering Thesis GTU India, 2015
Looking at the development in the construction, manufacturing process, variety of materials and a... more Looking at the development in the construction, manufacturing process, variety of materials and application of transformer, it is necessary to focus on technology of transformer design. The transformer design proposed in the current work is capable to manage with the existing complex power system network. Also, the main aim of optimization of transformer is to fulfill all the design criteria and minimizing the manufacturing cost. The optimization of transformer using various tools and methods has
been discussed in the report.
In dissertation phase-I, two methods for optimization in active part design were approached. First is iterative programming method and second is using optimization toolbox in MATLAB. In the first method, some design variants are created and by varying them, based on application point of view the selection of optimum design was carried out. In second method, the optimization toolbox in MATLAB gives the final
value of variable which satisfies the optimum design requirements.
In dissertation Phase-II, the design of tank is included in design of active part. Here, also two methods are approached for optimization of transformer for minimization of cost.
Multiobjective optimization is also used by considering two objective functions as cost minimization and No-load losses minimization by Non-Dominating Sorting Genetic Algorithm-II(NSGA-II).
Master of Engineering Thesis GTU India, 2013
Transformers are most essential and consequential elements in electricity transmission and distri... more Transformers are most essential and consequential elements in electricity transmission and distribution. Therefore, in order to have a transformer working at optimum level, many researches and tests have been being performed. The goal of these tests and researches is reducing the amount of losses and extends lifetime of a transformer. During the conversion of the electricity in a transformer, some losses occur. These losses occur at windings and core of the transformer and they turn into heat.
Transformers are widely used in almost all industrial application and is must for any basic industrial setup. As every machine, when running under normal condition is subjected to different kind of faults, the solution of which has to be carried out in advance to achieve best possible efficiency before actual use of the transformer.
In the initial step, we go through the numerous papers which has worked on different parameters of transformer using FEM analysis. And the results of the same will be used in determining modelling of a transformer in the software using Finite Element approach. This method helps to develop accurate models of the machine under both healthy and faulty conditions. It also accurately calculates magnetic fields and related transformer design parameters for different types of transformers with completed geometry, which increases possibilities of improving the design during the planning stage (Before actual use of transformer). Using this method, analysis of Internal Insulation Design Improvements, Accurate Prediction and Minimization of No Load Loss, Internal Stresses at high frequency and faults like leakage reactance, internal winding stress etc. will be carried out.
The analysis with the fault condition listed above will be simulated in FEM based software and the result will be compared with that of the transformer under healthy condition, which helps a great in knowing the worst possible condition under which transformer can be used.
The design of the transformer carried out by the above method will be helpful to the industry in the sense that maximum possible efficiency and accurate calculation of magnetic field and stresses on windings can be achieved under worst possible conditions.
Master Of Engineering Thesis GTU India, 2016
Nowadays solar power is one of the most suitable energy source for power
generation. Solar energy... more Nowadays solar power is one of the most suitable energy source for power
generation. Solar energy is usually available in renewable energy sources. Solar power plant cannot generate the power at night time, therefore operator will disconnected the solar farm at night time for power saving purpose. At next day connected the solar power plant to grid. Due to that kind of daily process, transformer that connected between solar power plant and grid, experience the inrush current. Inrush current may flow when transformer is energized. High amount harmonics, power quality issues, voltage distortion, stress on transformer winding, malfunctioning of relay such kind of issues are occurs due to inrush current. The amount of inrush current depends on switching instant of transformer energization, amount of residual flux in transformer core.
In this thesis contains the introduction of inrush current, calculation of inrush
Master of Engineering Thesis- BVM India, 2022
The transformer is an essential component of electrical machines, as seen in the power industry. ... more The transformer is an essential component of electrical machines, as seen in the power industry. However, in today's competitive market, manufacturers still aim to improve transformer performance. As a result, performing an accurate examination of transformer losses at this time becomes increasingly crucial. The transformer suffers from a variety of
losses, including load and no-load losses. Stray loss is a type of load loss that happens in the transformer's structural components. Stray loss is caused by a leaky magnetic field that connects to the transformer's structural components. Outside the winding, stray loss in the
transformer occurs mostly in the flitch plate, clamping plate, bolts, and transformer tank wall, among other places. This thesis is centered on the use of the finite element method to model and analyzed a 15MVA, 66/11KV power transformer (FEM). Maxwell 19.0 software is used to
simulate the transformer. The usage of Aluminum, Copper, and CRNGO materials can significantly reduce stray loss, according to the study. Although stray loss accounts for a small percentage of total transformer loss, eliminating it will not significantly enhance the transformer's efficiency. However, stray loss in structural components causes hot spots,
requiring more maintenance and shortening the transformer's life. As a result, it's critical to take the appropriate steps to reduce them. This thesis explains how to reduce the Stray loss component of a power transformer by varying the magnetic field density in the tank wall. By
keeping the economic issues in mind, to a large part. The experimental results are compared to the results obtained by approaching a numerical analysis (performed at Atlanta Electricals Pvt. Ltd.).
Keywords: Power Transformer, core loss, stray loss, flux density, Copper loss, Finite Element
Method.
Master of Engineering Thesis- BVM India, 2017
The transformer is an important electrical machine by far with the highest efficiency. However in... more The transformer is an important electrical machine by far with the highest efficiency. However in today’s competitive market producers still want to achieve better performance of transformer. Therefor at this stage it becomes increasingly important to perform accurate analysis of transformer losses. Various losses, such as load loss and no-load loss occurs in the transformer. Stray loss falls under load loss and it occurs in the structural components of the transformer. Stray loss is the result of leakage magnetic field linking with the structural components of transformer. Stray loss in the transformer outside the winding occurs mostly in flitch plate, clamping plate, bolts, tank wall of transformer etc.
This thesis is based on the design and analysis of 15MVA, 66/11KV power transformer with and without aluminum shielding using finite element method (FEM). The transformer is simulated on Maxwell15.0 software. The study reveals that stray loss can be reduced to a considerable amount by the use of aluminum shields. Although stray is a small part of total loss
of the transformer so reducing them will not improve the efficiency of transformer much, but stray loss in the structural components creates hot spots which leads to higher maintenance and reduced life of transformer. Therefor it is important to take appropriate measures to reduce
them. Present thesis describes the variation in magnetic field density in the tank wall of the power transformer with and without aluminum shielding also the variation of loss in tank is shown. The results of the proposed numerical method are compared with the experimental
results (performed at Atlanta Electricals Pvt. Ltd.).
Keywords: Power Transformer, core loss, ohmic loss, stray loss, flux density, Finite Element
Method.
Master of Engineering Thesis - GTU India, 2014
With the development in the construction, types of materials, manufacturing process and applicati... more With the development in the construction, types of materials, manufacturing process and applications of transformer, it is mandatory to focus on design considerations of transformer technology. The transformer designed in the present work is such that it can
cope up with the existing complex power system network. The design optimization of oil-filled power transformer using varied tools and methods has been discussed in the thesis and the same has been done throughout the dissertation work.
In phase I, the effect of frequency on the design of transformer has been analyzed. The design results so obtained show that the volume of transformer can be reduced by increasing the operating frequency.
In phase II, the following methods of optimization in design were approached. First is iterative computer programing method and second is optimization toolbox. In first method the design variants are created and by appropriately varying them the selection of optimum design based on application point of view was carried out. In second method the
optimization toolbox gives the final value of design variable that satisfies the optimal
design requirements.
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Papers by Chiragkumar Parekh
This work comprises the excel based software development for Transformer design as per conventional mathematical formulas, Industrial code of practice and applicable national and international standards. The optimization methods like GA,PSO,TLBO and the engineering analysis method like FEM is considered for this research work. Self-developed Binary encoded GA,PSO and TLBO is applied to drive the transformer design optimization. The multi objective optimization technique is applied for this work to conclude transformer design which has low cost and high efficiency. 15 MVA 66/11 kV transformer design data is referred to develop software based program of Transformer design and respective TDO methodology. On the base of developed TDO, the real transformer of 10 MVA 66/11 kV has been developed and tested at NABL laboratory.
Overloading, Partial Discharge (PD) etc. of mineral oil and Ester oil filled
power transformer. Mineral oil is the most commonly used insulating liquid
for transformer applications, and an extensive database of knowledge has
been accumulated over the years. Increased environmental, safety
performance and economic have led to the consideration of other oils for use as transformer insulating fluids. Esters have been used as dielectric liquids since the invention of oil filled transformers in the late 1980s. Both types of oils tested are commercial products and commonly used in transformers. A Partial discharge (PD) is localized dielectric breakdown of a small portion of a solid or fluid electrical insulation (EI) system under high voltage (HV) stress. The discharge may occur at any point in the insulation system that the electric field strength exceeds the breakdown strength of that portion of the insulation system. In transformers, the insulation system is comprised of the winding insulation material as well as the dielectric fluid. PD can occur in a gaseous (i.e.SF6), liquid (Mineral Oil –Ester Oil) or solid insulating medium (Press board, Craft Paper, Insulation etc). Insulation failures begin with and are characterized by small but detectable releases of energy or Partial Discharge. That means partial discharges are the first indication of insulation
been discussed in the report.
In dissertation phase-I, two methods for optimization in active part design were approached. First is iterative programming method and second is using optimization toolbox in MATLAB. In the first method, some design variants are created and by varying them, based on application point of view the selection of optimum design was carried out. In second method, the optimization toolbox in MATLAB gives the final
value of variable which satisfies the optimum design requirements.
In dissertation Phase-II, the design of tank is included in design of active part. Here, also two methods are approached for optimization of transformer for minimization of cost.
Multiobjective optimization is also used by considering two objective functions as cost minimization and No-load losses minimization by Non-Dominating Sorting Genetic Algorithm-II(NSGA-II).
Transformers are widely used in almost all industrial application and is must for any basic industrial setup. As every machine, when running under normal condition is subjected to different kind of faults, the solution of which has to be carried out in advance to achieve best possible efficiency before actual use of the transformer.
In the initial step, we go through the numerous papers which has worked on different parameters of transformer using FEM analysis. And the results of the same will be used in determining modelling of a transformer in the software using Finite Element approach. This method helps to develop accurate models of the machine under both healthy and faulty conditions. It also accurately calculates magnetic fields and related transformer design parameters for different types of transformers with completed geometry, which increases possibilities of improving the design during the planning stage (Before actual use of transformer). Using this method, analysis of Internal Insulation Design Improvements, Accurate Prediction and Minimization of No Load Loss, Internal Stresses at high frequency and faults like leakage reactance, internal winding stress etc. will be carried out.
The analysis with the fault condition listed above will be simulated in FEM based software and the result will be compared with that of the transformer under healthy condition, which helps a great in knowing the worst possible condition under which transformer can be used.
The design of the transformer carried out by the above method will be helpful to the industry in the sense that maximum possible efficiency and accurate calculation of magnetic field and stresses on windings can be achieved under worst possible conditions.
generation. Solar energy is usually available in renewable energy sources. Solar power plant cannot generate the power at night time, therefore operator will disconnected the solar farm at night time for power saving purpose. At next day connected the solar power plant to grid. Due to that kind of daily process, transformer that connected between solar power plant and grid, experience the inrush current. Inrush current may flow when transformer is energized. High amount harmonics, power quality issues, voltage distortion, stress on transformer winding, malfunctioning of relay such kind of issues are occurs due to inrush current. The amount of inrush current depends on switching instant of transformer energization, amount of residual flux in transformer core.
In this thesis contains the introduction of inrush current, calculation of inrush
losses, including load and no-load losses. Stray loss is a type of load loss that happens in the transformer's structural components. Stray loss is caused by a leaky magnetic field that connects to the transformer's structural components. Outside the winding, stray loss in the
transformer occurs mostly in the flitch plate, clamping plate, bolts, and transformer tank wall, among other places. This thesis is centered on the use of the finite element method to model and analyzed a 15MVA, 66/11KV power transformer (FEM). Maxwell 19.0 software is used to
simulate the transformer. The usage of Aluminum, Copper, and CRNGO materials can significantly reduce stray loss, according to the study. Although stray loss accounts for a small percentage of total transformer loss, eliminating it will not significantly enhance the transformer's efficiency. However, stray loss in structural components causes hot spots,
requiring more maintenance and shortening the transformer's life. As a result, it's critical to take the appropriate steps to reduce them. This thesis explains how to reduce the Stray loss component of a power transformer by varying the magnetic field density in the tank wall. By
keeping the economic issues in mind, to a large part. The experimental results are compared to the results obtained by approaching a numerical analysis (performed at Atlanta Electricals Pvt. Ltd.).
Keywords: Power Transformer, core loss, stray loss, flux density, Copper loss, Finite Element
Method.
This thesis is based on the design and analysis of 15MVA, 66/11KV power transformer with and without aluminum shielding using finite element method (FEM). The transformer is simulated on Maxwell15.0 software. The study reveals that stray loss can be reduced to a considerable amount by the use of aluminum shields. Although stray is a small part of total loss
of the transformer so reducing them will not improve the efficiency of transformer much, but stray loss in the structural components creates hot spots which leads to higher maintenance and reduced life of transformer. Therefor it is important to take appropriate measures to reduce
them. Present thesis describes the variation in magnetic field density in the tank wall of the power transformer with and without aluminum shielding also the variation of loss in tank is shown. The results of the proposed numerical method are compared with the experimental
results (performed at Atlanta Electricals Pvt. Ltd.).
Keywords: Power Transformer, core loss, ohmic loss, stray loss, flux density, Finite Element
Method.
cope up with the existing complex power system network. The design optimization of oil-filled power transformer using varied tools and methods has been discussed in the thesis and the same has been done throughout the dissertation work.
In phase I, the effect of frequency on the design of transformer has been analyzed. The design results so obtained show that the volume of transformer can be reduced by increasing the operating frequency.
In phase II, the following methods of optimization in design were approached. First is iterative computer programing method and second is optimization toolbox. In first method the design variants are created and by appropriately varying them the selection of optimum design based on application point of view was carried out. In second method the
optimization toolbox gives the final value of design variable that satisfies the optimal
design requirements.