power transformer Articles
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Regression analysis for insulation failures in transformer windings
The winding insulation system is the main component of power transformers. If there is any failure in winding insulation will have a crucial impact of the energy system operation. Insulation failure is the predominant part of faults and highest risk for all types of transformer failures. Most of the winding insulation failure is primly due to partial discharge. Partial discharge identification is ...
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Out of the closet, into the open: professionalism, power and the personal in development
In development thinking and practice, normal professionalism, power and personal orientations are linked with a paradigm associated with things. Paradigm here refers to mutually reinforcing concepts, values, methods, behaviours, relationships and mindsets. A shift of balance is needed to a paradigm associated with people. The realities experienced by poor and marginalised people differ from those ...
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Pilot Project 1 Case Study
The project was conducted at Rivière-au-Renard in November 2016 on a 2.25 MVA power transformer installed on a 7’ x 7’ concrete base. This is an experimental wind turbine for the Gaspe Wind Farm Technical Centre (TechnoCentre Éolien de Gaspé). The collaboration of TechnoCentre Éolien staff was essential and greatly ...
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Analysis of the conditions of use of the high-frequency power transformer and design principles
According to the conditions of use of the high-frequency power transformer (transformer manufacturers) analysis, the overall two-fold: the feasibility and electromagnetic compatibility. Only pay attention to the feasibility of environmental protection awareness, must pay attention to electromagnetic compatibility. Feasibility refers to the specific conditions of use, high-frequency power ...
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Development of modulation strategies for three-phase to two-phase matrix converters
In this paper, the modulation strategy is developed for three-phase to two-phase matrix converters for synthesising balanced and unbalanced output voltages from balanced and unbalanced input voltages. Reduction of low order input current harmonics with sinusoidal output voltages is achieved by using the proposed switching strategies. The other advantage of the proposed method is the significant ...
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Modelling oil degradation in electric transformer oil under typical loads
In testing transformer oils for durability, it is desirable to use typical transformer operating conditions with appropriate allowances for factor of safety against temperature and voltage. The kinetics of degradation of used type II transformer oil with original flash point of 148?C, pour point of 51?C, and water content of 4 ppm was investigated. Assuming that the oil temperature in models Pr01 ...
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Fire-Protection Decking Installation - Pamplona, Navarre (Spain) - Case Study
In April 2019, the AKHELEC team went to Pamplona in Navarre, Spain, to oversee the installation of 2 modular containment bunds – BAFX3 product range – fitted with our Filtrelec dielectric oil filter system on two 20 and 40 MVA power transformers. Our customer also installed a pair of BAF1 ...
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Modular Retention System Installation - Andalusia (Spain) - Case Study
In February, the AKHELEC team went to Andalusia in Southern Spain to inspect the installation of the modular retention system – BAFX product range – fitted with our Filtrelec dielectric oil filter system on a 30 MVA power transformer. Our customer also installed a standard containment bund on the ballast ...
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Detection and classification of power quality events using multiwavelets
Wavelet transforms have fundamentally been used to detect the major features of power quality events, as the transforms adapt to dynamic signals and are appropriate for capturing time-localised, short-period phenomena. The multiwavelets technique is proposed here to classify power quality events. This leads to easy extraction of a quality feature set, which is further used for classification and ...
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Three–phase modular single stage full–bridge converter for switched mode power supplies
In this paper, the modular development of a three–phase single stage ac–dc power converter based on single–phase ac–dc isolated full–bridge converter for telecom power supply applications is presented. Three single–phase converter modules are series connected to form a three–phase converter system to achieve balanced three–phase currents. This paper analyses the operation of a modular converter ...
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The Age of Renewable Power – New IRENA Guide to the Future of Energy
A new report from the International Renewable Energy Agency (IRENA) aims to assist countries in their transition to renewable energy-based power systems. The Age of Renewable Power, released today on the sidelines of the Innovation for Cool Earth Forum in Tokyo, identifies 20 measures that can be taken to support the development of national roadmaps to integrate variable renewables. It also ...
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What defines the new TIER2 ecodesign norm for transformers?
The new TIER2 ecodesign norm for transformers is a set of standards and regulations that are intended to improve the environmental performance of transformers. The norm was developed by the European Commission, and it establishes minimum requirements for the energy efficiency, sound power, and no-load losses of transformers. The main goal of the TIER2 ecodesign norm for transformers is to ...
By Protrafo
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Wavelet feature–based modular neural network for detection and classification of power quality disturbances
Disturbances such as voltage sag, swell, interruption and harmonics are very typical in a power system. Power quality monitoring should be capable of identifying these disturbances to initiate mitigation action and protect sensitive loads. This paper presents wavelet–neural network–based detection and classification of power quality disturbances. Wavelet transform has the ability to analyse ...
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Power losses from wind generated electricity in high voltage AC transmission: an analysis through simulation
In this paper, we have investigated different types of losses from wind generated electricity in high voltage AC (HVAC) transmission. Wind power generation is expensive in nature and it is thus necessary to know how much power is lost in the transmission. We have simulated an HVAC transmission system with a wind power generator in Simulink. We varied different components of the system namely wind ...
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DSTATCOM topologies for three-phase high power applications
This paper proposes distribution static compensator topologies for application in three-phase high power distribution systems. These topologies overcome both the voltage and current rating constraints imposed by the semiconductor switches by the use of three single-phase multi-secondary transformers. Five topologies, namely, four leg-group, three leg-group split-capacitor, H bridge-group, three ...
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Power quality indices measurement using the S-transform
The paper presents the S-transform (ST) technique as a new tool for power quality indices measurement. A key feature of the ST is its accurate time-frequency (amplitude and phase) domain. With this feature, it is possible to redefine the calculation of the power quality indices in the ST domain based on the harmonic content of the signals. In addition, using the time information provided by this ...
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Characterisation of power quality disturbances based on wavelet transforms
This paper presents a new technique for detecting and characterising disturbances in power systems based on wavelet transforms. The voltage signal under investigation is often corrupted by noises, therefore the voltage signal is first denoised using wavelet thresholding and then wavelet transform is applied to the denoised signal. Using the first-level detail wavelet coefficients, the voltage ...
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Classification of impulse fault response patterns in transformers using cascaded wavelet network
Accurate identification of winding faults that may develop during impulse testing of transformer is of great importance for ensuring reliability and quality of power supply. In the present work a wavelet network based methodology has been proposed for feature extraction as well as classification of those features for impulse fault pattern identification. The classification involves two networks, ...
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Performance of grid connected inverter with maximum power point tracker and power factor control
Detailed analysis, simulation and hardware results of grid connected inverter with maximum power point tracker and power factor control in Malaysian climate are presented. A six-switch topology inverter with symmetrical pulse width modulation (PWM) switching technique is used. A low-pass filter is incorporated in the circuit to filter out unwanted harmonics and produce a sinusoidal AC current. ...
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Two degrees of innovation—How to seize the opportunities in low-carbon power
This paper offers a strategic framework for those seeking to capitalize on the low-carbon transition. The first section presents innovation as a key strategy to achieve economic development, energy, and environmental goals. The second section explains why the innovation process is unique in the low-carbon power sector and introduces the innovation ecosystem. The third section lays out a stepby- ...
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