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Academic literature on the topic 'Transformer Taps'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "Transformer Taps"

1

Lailypour, Chia, and Murteza Farsadi. "A New Structure for Sen Transformer Using Three Winding Linear Transformer." International Journal of Power Electronics and Drive Systems (IJPEDS) 7, no. 2 (June 6, 2016): 440. http://dx.doi.org/10.11591/ijpeds.v7.i2.pp440-449.

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<p>In this paper a new structure for "Sen" transformer is introduced, by using three winding transformers with neutral point in order to use negative value of compensating voltage. Combination of taps will be adjusted by a novel algorithm, to control the required active and reactive powers, separately. This paper tries to focus on three parts. First of all there is an introduction on the concept of ST structure what comes next is a try to work on power flow control by using PI controllers and an algorithm to find the best and efficient combination of taps, finally proposed idea and algorithm will be implement on a practical system. Implementation of the system consist of two separated and related parts. The first one is about transmission line and Sen Transformer and the<em> </em>interaction between them. The second part is programing codes that adjust taps for required active and reactive powers.</p>

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Paoli, Joshua, Bernd Brinkmann, and Michael Negnevitsky. "A Practical Approach to Optimising Distribution Transformer Tap Settings." Energies 13, no. 18 (September 18, 2020): 4889. http://dx.doi.org/10.3390/en13184889.

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This paper proposes a method of determining the optimal tap settings for no-load distribution transformers with tap-changing capabilities that is practical to apply in real distribution networks. The risk of low voltage distribution networks violating voltage constraints is impacted by the increasing uptake of distributed energy resources and embedded generation. Some of this risk can be alleviated by suitably setting no-load transformer tap settings, however, modifying these taps requires customer outages and must be infrequent. Hence, loading over the entire year must be considered to account for seasonal variations when setting these taps optimally. These settings are determined using evolution strategy optimisation based on an average loading case. Monte Carlo simulations are used to calculate the probability that the terminal voltages on the distribution transformer secondary terminals violate the network voltage limits when the optimal set of taps for the average case is applied over a whole year. This algorithm was tested on several cases of a real distribution feeder of varying complexity, and produces a sufficiently-optimal set of taps without significant computation time.

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Mohamed, Mofreh. "Data Processing with Uncertain Transformer Taps.(Dept.E)." MEJ. Mansoura Engineering Journal 13, no. 1 (May 27, 2021): 73–81. http://dx.doi.org/10.21608/bfemu.2021.172666.

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4

Adibi, M. M., D. P. Milanicz, and T. L. Volkmann. "Simulating transformer taps for remote cranking operations." IEEE Computer Applications in Power 9, no. 3 (July 1996): 24–29. http://dx.doi.org/10.1109/67.526850.

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Eissa, M. M. "Local area supervisory protection system transformer taps." Electric Power Systems Research 62, no. 2 (June 2002): 105–10. http://dx.doi.org/10.1016/s0378-7796(02)00045-7.

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Kor, Ahmad, Hossein Zeynal, Zuhaina Zakaria, and Seyed Hamid Hosseini. "Optimal reactive power pricing with transformer variable taps using genetic algorithm." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 2 (April 1, 2023): 1272. http://dx.doi.org/10.11591/ijece.v13i2.pp1272-1280.

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<span lang="EN-US">Ancillary services in interconnected networks are crucial to secure real power transfers, maintaining network reliability, improving power quality as well as network stability. Reactive power has always been of special importance as one of the most substantial ancillary services required to control the voltage in power grid. This paper presents a fresh reactive power pricing approach by embedding variable transformer taps into voltage ampere reactive (var) pricing method. To carry out the resultant optimization problem with a set of complicating constraints, the genetic algorithm takes part and guarantees the global optimal solution. The simulation results show that when transformer tap works as a control variable, the total cost of reactive power can be decreased. However, the incorporation of transformer taps in the pricing model can slightly complicates voltage profiles as the sensitivity of bus voltages to the reactive power variations in the system is increased. Further, the findings reiterate that by optimal position of transformer taps, technically, the security index of the system can be enhanced while the var price for end-users (lowest purchase cost for independent system operator) being more reasonable. To simulate the proposed reactive pricing method, the standard IEEE 30-bus system is employed to analyze the proposed method.</span>

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Baran Junior, Antonio Rubens, Thelma S. Piazza Fernandes, and Ricardo Augusto Borba. "Voltage Regulation Planning for Distribution Networks Using Multi-Scenario Three-Phase Optimal Power Flow." Energies 13, no. 1 (December 29, 2019): 159. http://dx.doi.org/10.3390/en13010159.

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Active distribution networks must operate properly for different scenarios of load levels and distributed generation. An important operational requirement is to maintain the voltage profile within standard operating limits. To do this, this paper proposed a Multi-Scenario Three-Phase Optimal Power Flow (MTOPF) that plans the voltage regulation of unbalance and active distribution networks considering typical scenarios of operation. This MTOPF finds viable operation points by the optimal adjustments of voltage regulator taps and distribution transformer taps. The differentiating characteristic of this formulation is that in addition to the traditional tuning of voltage regulator taps of an active network applied for just one scenario of load and generation, it also performs the optimal adjustment of distribution transformer taps, which, once fixed, is able to meet the voltage limits of diverse operating situations. The optimization problem was solved by the primal-dual interior-point method and the formulation was tested using the IEEE 123-bus system.

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Zhao, ZG, SQ Zhang, HC Cheng, ZY Xu, and RJ Tan. "Research on Short-Circuit Impedance Analysis Method of Auto-transformer for Side Column Voltage Regulation." Journal of Physics: Conference Series 2476, no. 1 (April 1, 2023): 012066. http://dx.doi.org/10.1088/1742-6596/2476/1/012066.

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Abstract In order to realize the accurate analysis of the impedance of transformers with complex connection relations, this paper derives the impedance calculation method of low-voltage excitation side column linear voltage regulating autotransformer by using the power method. The transformer network with different taps is analyzed, and the calculation formulas of transformer HV-MV impedance, HV-LV impedance and MV-LV impedance are derived. The analysis is simplified to the solution of concentric column coil impedance and magnetic potential of each coil. By comparing the calculated data of actual products with the measured data, the calculation deviation of this method is controlled within 2.03%; By using the finite element method, the impedance of the transformer with the measures to control the magnetic shielding is analyzed and calculated. By comparing the impedance of the transformer with different measures, it can be confirmed that the magnetic leakage measures have an impact on the impedance of the transformer.

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Attia, Hussain. "Novel 9-Steps Automatic AC Voltage Regulator based on Two Step-down Transformers." International Journal of Electrical and Computer Engineering (IJECE) 7, no. 2 (April 1, 2017): 576. http://dx.doi.org/10.11591/ijece.v7i2.pp576-583.

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<p class="IEEEAbtract">A novel design and simulation results of 9-steps automatic AC voltage regulator based on one step-down transformer is presented in this paper. Avoiding the problem of surge at the AC load during controlling jump steps is done through the proposed design. Accurate and smooth controlling function is achieved as well. Instead of the necessity of increasing the number of taps of the used multi tap transformer for wide controlling range of fluctuated AC supply voltage, the proposed designed adopts using only two step down transformers with 10 Vrms, and 30 Vrms secondary voltages respectively. Through the controlling of the proposed design of AV voltage regulator, the resultant load voltage is equal the AC supply voltage as well as the suitable voltage step which may one of the following voltages; +40V, +30V, +20V, +10V, 0V, -10V, -20V, -30V, -40V. The electronic design is done Multisim software while the electrical circuit connection of step down transformers and relays contacts that is made by using PSIM software for power circuit design.</p>

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Al-Ameri, S., A. A. Alawady, M. F. M. Yousof, H. Ahmad, Ali A. Salem, and M. A. Talib. "Frequency response analysis for transformer tap changer damage detection." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 1 (March 1, 2020): 350. http://dx.doi.org/10.11591/ijpeds.v11.i1.pp350-358.

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Frequency response analysis (FRA) method has been proven to detect the transformer winding damage. However, there is no practical study which investigates the damages on transformer tap changer even though it has a high failure rate. Hence, this paper investigates normal and faulty transformer tap changer using FRA. The FRA measurements conducted using four different test configurations. Also, normal tap changer, pitting and coking tap changer contact were investigated. In addition to FRA measurement, winding resistance measurement has been conducted. The transformer turn ratio measurement also conducted to identify the taps positions. This study results significant to understand the effect of pitting and coking tap changer on the transformer frequency response. The results showed that pitting has a slight influence on the frequency response. However, coking shows a huge variation in low-frequency response. This effect observed during the winding resistance measurement.

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Dissertations / Theses on the topic "Transformer Taps"

1

Hogg, Robert Andrew. "An adaptive, microprocessor based transformer differential relay with harmonic restraint and transformer tap changer detection." Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315575.

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Kang, Pengju. "On-line condition assessment of power transformer on-load tap-changers : transient vibration analysis using wavelet transform and self organising map." Thesis, Queensland University of Technology, 2000.

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FERREIRA, CARLOS APARECIDO. "AN IMPROVED STEADY-STATE MODEL FOR TAP-CHANGING TRANSFORMER." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=21702@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
O fenômeno de estabilidade de tensão vem despertando grande interesse acadêmico e das principais empresas de energia elétrica do mundo desde que começou a ser observado em sistemas reais, no final da década de setenta. Sua ocorrência está relacionada ao carregamento excessivo das linhas de transmissão. Modelar transformador com tap variável adequadamente é fundamental em análises de estabilidade de tensão, tanto no que diz respeito às informações fornecidas ao operador referentes às margens de estabilidade de tensão, quanto aos efeitos de ações de controle de tensão. O modelo de transformador com tap variável utilizado mundialmente consiste de uma impedância, obtida através do ensaio em curto-circuito e com tap nominal, em série com um transformador ideal. Esta tese mostra que, em estudos de estabilidade de tensão, o uso desse modelo leva a resultados qualitativamente errados. Para demonstração, utiliza-se um circuito pequeno e os conceitos de máxima potência transmitida, impedância equivalente da carga, e efeito do controle de tensão. Propõe-se um novo modelo coerente com os resultados obtidos em laboratório, com as leis de circuitos elétricos e com a teoria de estabilidade de tensão. Esse modelo pode ser utilizado em qualquer estudo em regime permanente. Através de diversas simulações computacionais, diferenças quantitativas e principalmente qualitativas foram obtidas comparando-se os resultados dos dois modelos.
The voltage stability phenomenon is of interest since it began to be observed in real systems in the late seventies. It happens due to excessive loading of transmission lines. The modeling of tap-changing transformers is fundamental in voltage stability analysis, in terms of the information provided to the operator about voltage stability margins and the effects of voltage control actions. The model for tap-changing transformers currently in widespread use consists of an impedance, measured in a short-circuit test with a nominal tap, in series with an ideal transformer. The use of this model in voltage stability studies leads to qualitatively incorrect results, as shown in this thesis. For demonstration purpose a small circuit and the concepts of maximum load, equivalent load impedance and voltage control effects are used. An improved model that takes into account laboratory results, circuit laws and voltage stability theory is proposed. This model can be used in any steady-state study. It gives results that are not only more accurate than those obtained with the conventional model, but also, as shown in this thesis, qualitatively different.

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Gao, Chao. "Voltage control in distribution networks using on-load tap changer transformers." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.607476.

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Voltage is one of the most important parameters for electrical power networks. The Distribution Network Operators (DNOs) have the responsibility to maintain the voltage supplied to consumers within statutory limits. On-Load Tap Changer (OLTC) transformer equipped with Automatic Voltage Control (AVC) relay is the most widely used and effective voltage control device. Due to a variety of advantages of adding Distributed Generation (DG), more and more distributed resources are connected to local distribution networks to solve constraints of networks, reduce the losses from power supply station to consumers. When DG is connected, the direction of power flow can be reversed when the DG output power exceeds the local load. This means that the bidirectional power flow can either be from power grid towards loads, or vice versa. The connection point of DG may suffer overvoltage when the DG is producing a large amount of apparent power. The intermittent nature of renewable energy resources which are most frequently used in DG technology results in uncertainty of distribution network operation. Overall, conventional OLTC voltage control methods need to be changed when DG is connected to distribution networks. The required voltage control needs to address challenges outlined above and new control method need to be formulated to reduce the limitations of DG output restricted by current operational policies by DNOs. The thesis presents an analysis of voltage control using OLTC transformer with DG in distribution networks. The thesis reviews conventional OLTC voltage control schemes and existing policies of DNOs in the UK. An overview of DG technologies is also presented with their operation characteristics based on power output. The impact of DG on OLTC voltage control schemes in distribution networks is simulated and discussed. The effects of different X/R ratio of overhead line and underground cable are also considered. These impacts need to be critically assessed before any new method implementation. The thesis also introduces the new concepts of Smart Grid and Smart Meter in terms of the transition from passive to active distribution networks. The role of Smart Meter and an overview of communication technologies that could be used for voltage control are investigated. The thesis analyses the high latency of an example solution of which cost and availability are considered to demonstrate the real-time voltage control using Smart Metering with existing communication infrastructures cannot be achieved cost-effectively. The thesis provides an advanced compensation-based OLTC voltage control algorithm using Automatic Compensation Voltage Control (ACVC) technique to improve the voltage control performance with DG penetration without communication. The proposed algorithm is simulated under varying load and DG conditions based on Simulink MATLAB to show the robustness of the proposed method. A generic 11kV network in the UK is modelled to evaluate the correct control performance of the advanced voltage control algorithm while increasing the DG capacity.

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Fu, Le. "Voltage stability monitoring and enhancement in electrical power systems using transformer tap changers." Thesis, Imperial College London, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506484.

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Stenhammar, Oscar. "Analysis of factory test data of on-load tap-changers for power transformers." Thesis, Uppsala universitet, Avdelningen för systemteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-447236.

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On-load tap-changers (OLTC) are devices in the power grid that keeps the voltage level constant for consumers, regardless of the power demand. Hitachi ABB Power Grids, producer of the OLTC family named VUC, guarantees 30 years of lifetime. Such a pledge requires high standard devices. This thesis has analyzed data from routine tests of switching times in the diverter switch of OLTC’s, performed before devices were put in service. The correlation of part switching times for all units leaving the factory during the past year was evaluated by calculating Pearson’s correlation coefficient. A linear trend was fitted to the data, realizing that the prediction errors, as well as the part switching times, were Gaussian distributed. The time while the resistor vacuum interrupter was open could be predicted within the interval of approximately 2ms with 2 standard deviations accuracy. To classify time series from the routine test as expected or unexpected, a model-based algorithm was implemented. The average switching time for all consecutive switches was used to define expected series. A moving average was implemented to neglect outliers and remove oscillating patterns. The majority of all data was classified as expected time series. The ones who did not, still preserved a good correlation between the part switching times. Examining the relationship between part switching times could be a valuable perspective in further classification of expected time series. The possibility of incorporating measurement of part switching times on OLTC’s in normal operation, to use the knowledge gained by this thesis, was investigated. Position sensors were mounted to measure the position of the lifting yokes, opening and closing the vacuum interrupters. The time while the vacuum interrupter contacts were open could be estimated with better accuracy than the position sensor provided. Unfortunately, those sensors cannot be utilized in normal operation. If other possibilities could be found, perhaps a laser position sensor, the implemented algorithm would be valuable.

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Maneikis, Andrius. "Distribution On Load Tap Changer Control Using IEC61850 Client/Server Architecture." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193673.

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Distributed generation is transforming the power system grid to decentralized system where separate units like wind power generators or solar panel shall coexist and operate in tandem in order to supplement each other and make one extensive system as a whole so called smart grid. It is utmost important to have a control ability over such units not only on a field level but on a system level as well. To be able to communicate with numerous devices and maintain interoperability universal standard is a must. Therefore, one of the core standards relevant to smart grids is IEC 61850 – Power Utility Automation which comes into assistance and tackles aforementioned challenges. This project uses IEC61850 architecture to implement client/server windows applications for on-load tap changer remote control. The proposed solution and designed applications are tested together with a real time simulator where simple power system is modelled to emulate the system response to control signals in a real time. In this way, the implemented applications can be tried and assessed as if performing in real environment. Consequently, a user of the client application is able to remotely control voltage on the power transformer's secondary side and manipulate the switching equipment simulated in the model.
Distribuerad generation håller på att förändra transmissionsnätet till decentraliserat system där separata enheter som vindkraftverk eller solpanel skall samexistera och fungera tillsammans för att komplettera varandra och att göra ett omfattande system som helhet så kallade smarta elnät. Det är ytterst viktigt att ha en kontroll förmåga över sådana enheter inte bara på ett fältnivå utan även på systemnivå. För att kunna kommunicera med många enheter och bibehålla interoperabiliten som universell standard är ett måste. En av de grundläggande normer som är relevanta för smarta nät är IEC 61850 - Skydd & Automation, som kommer in i bistånd och möter ovan nämnda utmaningar. Detta projekt använder IEC61850-struktur för att implementera klient/server windows applikation för lindningskopplarens fjärrkontroll. Den föreslagna lösningen och utformade applikationer testas tillsammans med en realtidssimulator där enkelt kraftsystem modelleras för att emulera systemets svar på de givna styrsignalerna i realtid. På detta sätt kan de implementerade programmen prövas och bedömas hur de utföras i verklig miljö. Följaktligen kan användare av klientapplikationen fjärrstyra spänningen på transformatorns sekundärsida och manipulera ställverk som simuleras i modellen.

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Baltazar-Lopez, Martin Eduardo. "Applications of TAP-NDE technique to non-contact ultrasonic inspection in tubulars." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/1614.

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The possibility and feasibility of experimental detection of localized defects in tubes using laser-induced ultrasonic wave approach through Thermo Acousto Photonic Non Destructive Evaluation (TAP-NDE) and Signal processing through wavelet transform is examined in this research. Guided waves in cylindrical surfaces provide solutions for detection of different defects in the material. Several experiments were conducted to this respect. Wave propagation in both axial and circumferential directions was studied. The dispersive wave propagation of ultrasonic waves in hollow cylinders has been investigated experimentally, primarily for use in non-contact and nondestructive inspections of pipes and tubes. The laser ultrasonic waves propagated in cylindrical waveguides are particularly attractive because of their unique characteristics in the applications of nondestructive evaluation (NDE). Contrary to studies making use of only axially symmetric guided waves in hollow cylinders, here are analyzed also nonaxisymmetric waves. The analysis of data is made by using the Gabor wavelet transform. The capability of modeling the guided wave dispersion in hollow cylinders is used in developing guided wave experimental techniques for flaw detection. Good agreement was obtained when comparing the dispersion spectra between theory and experimentation. Measurement of group velocities of guided waves, which are obtained directly from the wavelet transform coefficients, can be used to determine allocation and sizing of flaws.

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Pieters, Willem Diederick. "Monitoring, protection, and voltage control of parallel power transformers based on IEC 61850-9-2 process bus." Thesis, Cape Peninsula University of Technology, 2019. http://hdl.handle.net/20.500.11838/3067.

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Thesis (MEng (Electrical Engineering)--Cape Peninsula University of Technology, 2019
The purpose of an electrical power system is to supply electrical energy to the customers. Power transformers are required to transform the system voltage from generation to transmission and distribution levels. Protection and control systems must ensure that power system high voltage equipment such as transformers operate and deliver save, reliable and secure electricity supply. The aim of the project research work is to develop and implement a strategy, methods and algorithms for monitoring, protection and voltage control of parallel power transformers based on IEC 61850-9-2 process bus standard. NamPower is a power utility in Namibia. The IEC 61850 protocol for electrical substation automation system is used for the protection and control of 5 power transformers operated in parallel in an existing substation system. The IEC 61850-9-2 process bus standard is however not used in regards of Sampled Values (SV). Protection and control devices are connected to a substation communication network, routers and switches using fibre optic linked Ethernet. Inductive Current Transformers (CTs) and Voltage Transformers (VTs) secondary circuits are hardwired to Intelligent Electronic Devices (IEDs) and fibre optic links are not used for this purpose at process level communication. The research focuses on the implementation of the IEC 61850 standard with Merging Units (MUs) and sampled values to improve the existing implemented protection and control system at NamPower. This includes substation communication networks and MUs used for transformer protection, voltage regulator control and cooling fan control. At the present the CTs located at the transformer bushings and switchgear and the VTs located at the switchgear are hardwired to the inputs on protection and control IEDs. The research focuses on issues with the copper wires for voltage and currents signals and how these issues can be eliminated by using the MUs and the SV protocol. The MUs which are considered in this Thesis is to improve the voltage regulator control and the control of the cooling fan motors. The voltage regulator control IED is situated at the tap change motor drive of the On-Load Tap Changer (OLTC). The IED of each transformer is required to regulate the voltage level of the secondary side bus bar it is connected to. All the regulating IEDs are required to communicate with each other and collectively to control the bus bar voltage depending on the switching configuration of the parallel transformers. The control circuit for controlling the cooling fan motors is hardwired. Temperature analogue signal input into a programmable automation controller IED can be used for controlling the transformer cooling fans. A strategy, methods and algorithms for transformer protection, voltage regulator control and cooling fan motor control of parallel power transformers need to be developed and implemented based on IEC 61850-9-2 process bus. Power utilities and distributors can benefit from interpretation of the IEC 61850-9-2 standard and implementing MUs and SV in substations. MUs can be included in the power transformer protection, automation and control systems. A cost reduction in high voltage equipment, substation installation and commissioning costs and better performance of protection and control system are anticipated.

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Karimi, Seywan. "Dielectrics calculation of on-load tap-changer VUCL." Thesis, KTH, Hållbar produktionsutveckling (ML), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-292536.

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This is a bachelor's thesis in Mechanical engineering. The main topic of the thesis is the electrical calculation of the tap changer's shield. Although there are many kinds of tap-changers, this study focuses on VUCL models. The theoretical background of the thesis is that the new shield is suitable and useable in all VUCL models. The primary topic of the thesis is to study that the new shield protects the resistance box in the middle of the tap changers. To do this study, Creo Parametric, Comsol, and SpaceClaim are the programs used.
Detta är en kandidatexamen i maskinteknik. Avhandlingens huvudämne är den elektriska beräkningen av kranbytarens sköld. Även om det finns många olika typer av lindnings fokuserar denna studie på VUCL modeller. Den teoretiska bakgrunden för avhandlingen är att den nya skölden är lämplig och användbar i alla VUCL-modeller. Det primära ämnet för avhandlingen är att studera det nya sköld skyddar motståndet rutan i mitten av lindningskopplare. För att göra denna studie är Creo Parametric, Comsol och SpaceClaim de program som används.

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Books on the topic "Transformer Taps"

1

Learning, Thomson Delmar. Single Phase Transformers & Electrical Machines Videos - Tape 5: Single Phase Transformers. Delmar Learning, 2002.

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Learning, Thomson Delmar. Single Phase Transformers & Electrical Machines Tape #2: DC Machines. Delmar Learning, 2002.

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Be Ye Transformed Audio Set (8 Tapes) (King's High Way (Audio)). Koinonia House, 1996.

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Learning, Thomson Delmar. Single Phase Transformers & Electrical Machines Videos - Tape #4: Single Phase Motors, Part II. Delmar Learning, 2002.

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Learning, Thomson Delmar. Single Phase Transformers & Electrical Machines Video Set (Tapes 5-8) (Electrical Theory Video). Delmar Learning, 2002.

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Learning, Thomson Delmar. Single Phase Transformers & Electrical Machines Videos - Tape #3: Single Phase Motors, Part I. Delmar Learning, 2002.

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Learning, Thomson Delmar. Single Phase Transformers & Electrical Machines Video Set CD-ROM (Tapes 5-8) (Electrical Theory Video). Delmar Learning, 2002.

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Perks, Robert B. Messiah with the Microphone? Oral Historians, Technology, and Sound Archives. Edited by Donald A. Ritchie. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780195339550.013.0023.

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For decades, oral historians and their tape recorders have been inseparable, but it has also been an uneasy marriage of convenience. The recorder is both our “tool of trade” and also that part of the interview with which historians are least comfortable. Oral historians' relationship with archivists has been an uneasy one. From the very beginnings of the modern oral history movement in the 1940s, archivists have played an important role. The arrival of “artifact-free” digital audio recorders and mass access via the Internet has transformed the relationship between the historian and the source. Accomplished twenty-first-century oral history practitioners are now expected to acquire advanced technological skills to capture, preserve, analyze, edit, and present their data to ever larger audiences. The development of oral history in many parts of the world was influenced by the involvement of sound archivists and librarians. Digital revolution in the present century continues to influence oral history.

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Matzko, Paul. The Radio Right. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190073220.001.0001.

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By the early 1960s, and for the first time in history, most Americans across the nation could tune their radio to a station that aired conservative programming from dawn to dusk. People listened to these shows in remarkable numbers; for example, the broadcaster with the largest listening audience, Carl McIntire, had a weekly audience of twenty million, or one in nine American households. For the sake of comparison, that is a higher percentage of the country than would listen to conservative talk radio host Rush Limbaugh forty years later. As this Radio Right phenomenon grew, President John F. Kennedy responded with the most successful government censorship campaign of the last half century. Taking the advice of union leader Walter Reuther, the Kennedy administration used the Internal Revenue Service and the Federal Communications Commission to pressure stations into dropping conservative programs. This book reveals the growing power of the Radio Right through the eyes of its opponents using confidential reports, internal correspondence, and Oval Office tape recordings. With the help of other liberal organizations, including the Democratic National Committee and the National Council of Churches, the censorship campaign muted the Radio Right. But by the late 1970s, technological innovations and regulatory changes fueled a resurgence in conservative broadcasting. A new generation of conservative broadcasters, from Pat Robertson to Ronald Reagan, harnessed the power of conservative mass media and transformed the political landscape of America.

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Desafios da educação na contemporaneidade: discursos emergentes e concepções de ensino. Editora Amplla, 2020. http://dx.doi.org/10.51859/amplla.dec139.1120-0.

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Pensar a Educação no século XXI é um desafio intrigante. Já se fala em Educação 4.0, nomenclatura proveniente do desenvolvimento rápido e contínuo das tecnologias da informação e comunicação (TICs) e da internet que tem, cada vez mais, invadido o cotidiano das escolas e das salas de aula. Enquanto se teoriza uma Educação que, supostamente, é 4.0 e tem acompanhado as tendências digitais, ousamos problematizar que os problemas e desafios que envolvem os espaços educativos ainda são da geração 1.0. O termo Educação 1.0, do final do século XVIII, conceitua um enfoque tradicional de educação, o professor é o protagonista e o processo de ensino e aprendizagem individualizado, reservado as elites. A educação 2.0 surgiu com o intuito de preparar o homem para trabalhar nas fábricas durante o século XIX, os processos eram pautados na repetição e memorização. Em meados do século XX, a partir da 3° Revolução Industrial, surgiu a educação 3.0 que, de maneira inovadora, incorporou as novas tecnologias aos processos de ensino e aprendizagem, tratando os alunos como protagonistas da sua aprendizagem, democratização do saber. Já a educação 4.0 aparece como consequência da quarta revolução industrial, buscando atender as supostas emergências e necessidades do século, informações mais acessíveis, digitalização dos processos e diversas possibilidades de inovação1 . A obra "Desafios da educação na contemporaneidade: discursos emergentes e concepções de ensino" contém artigos que levam a pensar nesses desafios, compreendendo que eles envolvem as tecnologias digitais, mas vão bem além delas. Há desafios emergentes nos processos de ensino e aprendizagem que por ora são silenciados em detrimento de outros. Esta obra é uma das aberturas das cortinas das escolas e salas de aula visando trazer à tona temáticas que, na maioria das vezes, ainda são invisibilizadas. Tais temáticas, abordadas ao longo dos capítulos, enfocam desafios das mais diversas ordens, tais como: Formação de professores, prática docente, educação e diretos humanos, projeto político pedagógico, educação e tecnologias, educação na 1 LENGEL, J. G. A evolução da educação: 1-2-3. In: Carvalho, M. T. (Org.). Educação 3.0: novas perspectivas para o ensino. Unisinos. São Leopoldo, RS: 2017. pandemia, ensino remoto, educação a distância, educação e cultura, relações étnicoraciais, educação inclusiva, estágio docente, dentre outras. A partir das temáticas abordadas pelos autores e pelas autoras, percebemos que ao falar dos desafios da educação na contemporaneidade e ao analisar esses desafios visando desnudar o chão dos espaços educativos, as discussões têm como objetivo central o encontro de possíveis caminhos que colaborem e motivem não apenas os profissionais da educação, mas também seus alunos e alunas. Enquanto os desafios se desenham como vielas aparentemente sem saída, caminhos bifurcados ou como o tão conhecido fundo do poço, o debate sobre eles aqui proposto tendem por ressignificálos à medida que transformam os desafios em molas propulsoras de esperança e de novas possibilidades. Problematizar e refletir sobre a educação contemporânea e seus desafios é uma forma de ser sensível ao que vivem os profissionais da educação espalhados por esse país em seu trabalho cotidiano com os alunos e as alunas. Essa sensibilidade é ainda mais urgente quando, além dos já conhecidos inúmeros desafios que assolam a educação brasileira, passamos a viver, de repente, um contexto de pandemia, a saber, a pandemia do novo coronavírus (COVID 19). Nesse contexto, as questões discutidas pelos autores, de maneira envolvente e interdisciplinar a partir de abordagens teórico-metodológicas, funcionam ainda como materiais de apoio, de colaboração e de esperança para os profissionais da educação. Falar sobre os desafios não significa esbarrar neles e estagnar. É preciso fazer, sem romantizar, o que os profissionais da educação desse país sabem fazer de melhor: Ousar, criar, redesenhar, esperançar, amar... Mesmo diante do caos. Que os desafios aqui discutidos sejam possibilidades de pensar além.

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Book chapters on the topic "Transformer Taps"

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Pedoeem, Jonathan, Guy Bar Yosef, Shifra Abittan, and Sam Keene. "TABS: Transformer Based Seizure Detection." In Biomedical Sensing and Analysis, 133–60. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99383-2_4.

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Funaki, K., and M. Iwakuma. "Recent Applications of Bi-2223 Tapes to Transformer Windings and Pulsed Coils." In Advances in Superconductivity XII, 842–47. Tokyo: Springer Japan, 2000. http://dx.doi.org/10.1007/978-4-431-66877-0_249.

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Patkar, Archana. "Policy and Practice Pathways to Addressing Menstrual Stigma and Discrimination." In The Palgrave Handbook of Critical Menstruation Studies, 485–509. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0614-7_38.

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Abstract Patkar traces the efforts in various countries to break the silence and stigma surrounding menstruation and to develop national policies on menstrual hygiene. She argues that changes in social norms, institutions, and behaviors linked to taboo topics are best facilitated by simple, evidence-based policies anchored in voice and participation. She asserts that men are willing and essential agents of change for gender equality when presented with pragmatic problems and implementable solutions. Basic noncontroversial and essential services and infrastructure, such as taps and toilets, serve as powerful entry points to articulating, exploring, and addressing wider gender and exclusion issues. Drawing on her experiences working with governments in Africa and Asia and reflecting on her journey over the past decades, Patkar outlines a methodology and pathway to transform the silence around menstruation into policy and action.

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Hadi, Hend A., and Loay E. George. "EEG Data Compression Using Tap9/7 Wavelet Transform and Double Shift-Coding." In Communications in Computer and Information Science, 162–70. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-35442-7_9.

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Ghose, Anindya. "The Next-Generation Technologies." In Tap. The MIT Press, 2017. http://dx.doi.org/10.7551/mitpress/9780262036276.003.0015.

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This chapter discusses emerging technologies, including wearable technologies, artificial intelligence, instant messaging and apps, smart homes and connected cars, smart wallets, and virtual reality/augmented reality. It concludes that there is a lot to explore with the technology and capabilities at hand today in the mobile world. At the same time, there is a lot in the future to be excited about as well. Within a few years, the mobile ecosystem and related technologies will transform our lives beyond recognition and usher in a new age. It will without doubt be recognized as one of the hallmark advancements that society has seen in the 21st century.

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Kelly, Casey Ryan. "Introduction." In Caught on Tape, 1–28. Oxford University PressNew York, 2023. http://dx.doi.org/10.1093/oso/9780197677865.003.0001.

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Abstract This introduction discusses the central theoretical and contextual elements of the book, including concepts such as obscene enjoyment, convergence culture, spectatorship, jouissance, the death drive, surveillance, and rhetoric. It establishes the central argument of the book, which is that addressing race and gender inequality with the promise of scandalous hot mics and obscene private videos transforms antiracism and gender justice into disempowering forms of spectatorship that ultimately conceal the structural nature of whiteness, white supremacy, and patriarchy.

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Kelly, Casey Ryan. "Epilogue." In Caught on Tape, 127–40. Oxford University PressNew York, 2023. http://dx.doi.org/10.1093/oso/9780197677865.003.0006.

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Abstract I conclude by illustrating what it would entail for us to, in Žižek’s words, “traverse the fantasy” of postracial and postfeminist culture to bring about a productive reckoning with the horrors, fissures, and failures of the Symbolic—to cease attributing the Other with the possession of the lost object and to transform white masculinity’s relationship to the death drive. In this Epilogue, I consider the implications of calling back the law of the paternal signifier in relation to the Other’s enjoyment. Part of the problem with prescribing political alternatives is that prohibition is the ultimate source of enjoyment for the transgressor. I suggest that one healthy route is to create space for indifference to the Other’s enjoyment—not so much a matter of ignoring the law as much as it is a refusal to look, so as to change our psychical orientation toward the death drive.

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M., Suchetha, and Jagannath M. "Biosignal Denoising Techniques." In Handbook of Research on Information Security in Biomedical Signal Processing, 26–37. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-5152-2.ch002.

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The main aim of ECG signal enhancement is to separate the required signal components from the unwanted artifacts. Adaptive filter-based ECG enhancement helps in detecting time varying potentials and also helps to track the dynamic variations of the signals. LMS-based adaptive recurrent filter is used to obtain the impulse response of normal QRS complexes. It is also used for arrhythmia detection in ambulatory ECG recordings. Adaptive filters self-modify its frequency response to change the behavior in time. This property of adaptive filter allows it to adapt its response to change in the input signal characteristics. A major problem in adaptive filtering is the computational complexity of adaptive algorithm when the unknown system has a long impulse response and therefore requires a large number of taps. The wavelet transform is a time-scale representation method with a basis function called mother wavelet. In wavelet transform, the input signal is subsequently decomposed into subbands. Wavelet transform thresholding in the subband gives better performance of denoising.

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Noakes, Stephen. "The superpower’s dilemma: to appease, repress, or transform transnational advocacy networks?" In The Advocacy Trap. Manchester University Press, 2018. http://dx.doi.org/10.7228/manchester/9781526119476.003.0001.

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This introductory chapter spells out a crucial problem in the study of transnational networks from the perspective of international relations scholarship—if TANs are fundamentally ideational constructs, defined and driven by commitment to a core principle or cause, what are we to make of periodic changes to their mission and message? What is the role of China’s strong authoritarian state in shaping the trajectories and results of transnational advocacy campaigns? The chapter posits that the soft power of the state (backed by coercive capability) imposes incentives on TANs that can effect the various processes and pathways taken by advocacy campaigns. The chapter suggests that advocates and activists need to take the state and its structures seriously when crafting advocacy, given the causal influence these have over campaign trajectories and campaign results.

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Jayamanne, Laleen. "Nicole Kidman in Blue Light: Stanley Kubrick’s Eyes Wide Shut (1999)." In Poetic Cinema and the Spirit of the Gift in the Films of Pabst, Parajanov, Kubrick, and Ruiz. Nieuwe Prinsengracht 89 1018 VR Amsterdam Nederland: Amsterdam University Press, 2021. http://dx.doi.org/10.5117/9789463726245_ch03.

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The strange, inexplicable movement of light and colour of the image is examined in relationship to Nicole Kidman’s unique form of acting in this film. Kidman acts in slow motion. The dynamism of colour and Kidman’s slowed-down speech acts are explored to show how, together, they transform the relationship between the heterosexual married fictional couple Alice and Bill, played by the real-life couple Kidman and Cruise. Kubrick taps into and draws out Kidman’s metamorphic powers as an actor. The industrial, technical, and aesthetic context is Kubrick’s experiments with light and colour on celluloid, at the moment of its obsolescence.

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Conference papers on the topic "Transformer Taps"

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Ekwue, A. O. "On-line estimation of transformer taps." In International Conference on Control '94. IEE, 1994. http://dx.doi.org/10.1049/cp:19940347.

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Biansoongnern, S., S. Chusanapiputt, and S. Phoomvuthisarn. "Minimization of Transmission Loss with Consideration of Transformer Taps Constraint." In TENCON 2005 - 2005 IEEE Region 10 Conference. IEEE, 2005. http://dx.doi.org/10.1109/tencon.2005.300959.

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Romero-Ramos, E., A. de la Villa-Jaen, and M. del P. Castillo-Gomez. "New insight into the possibilities of estimating secondary distribution transformer taps." In 2016 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe). IEEE, 2016. http://dx.doi.org/10.1109/isgteurope.2016.7856337.

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Paul, Dev, and Kor Yan. "A Case History of Shore Power Transformer Taps Arcing during No-Load Condition." In 2020 IEEE/IAS 56th Industrial and Commercial Power Systems Technical Conference (I&CPS). IEEE, 2020. http://dx.doi.org/10.1109/icps48389.2020.9176781.

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Nielsen, Shawn D. "Reconstruction of the Transformer Response from on-Line FRA Measurements Performed via Bushing Taps." In 2018 Condition Monitoring and Diagnosis (CMD). IEEE, 2018. http://dx.doi.org/10.1109/cmd.2018.8535717.

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Wang Yuting, Xue Mingjun, and Li Peng. "The Equivalent Circuit of the Auto-Transformer with Taps Unbalance and Its Influence on Zero-Sequence Current." In 11th IET International Conference on Advances in Power System Control, Operation and Management (APSCOM 2018). Institution of Engineering and Technology, 2018. http://dx.doi.org/10.1049/cp.2018.1748.

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Wang, Xiaoyan, Masanori Hanawa, Kazuhiko Nakamura, Katsumi Takano, and Kiyoshi Nakagawa. "Sideband suppression characteristics of optical SSB generation filter with sampled FBG based 4-taps optical Hilbert transformer." In 2009 15th Asia-Pacific Conference on Communications (APCC). IEEE, 2009. http://dx.doi.org/10.1109/apcc.2009.5375552.

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Ghosh, Anjan K., Sam Lisle, and Susan D. Allen. "Guidelines for the design of fiber optic transversal filters." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.mll7.

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A transversal filter is the most basic optical signal processing device that can be built from a fiber optic tapped delay line. If x(t) represents the lightwave signal in the fiber, the output of the transversal filter is given by where {hn} = tap weights determined by a spatial light modulator and dn = time delay for the (n + 1)th tap. Selecting values of the impulse response terms {hn} and the tap delays we can design low-pass, high-pass, bandpass, and bandstop filters, arithmetic Fourier transform calculators, equalizers, etc. The characteristics of analog fiber optic processors are affected by the optical error sources: spatial errors in tap weights, attenuation and position errors in taps, detector noise, and dispersion in fiber. The total effect of these error sources produces a new transfer function, H′(ω) = H(ω) + D(ω) − jωT[H(ω) ∗ S(ω)] + E(ω), where D(ω), S(ω), and E(ω) are Fourier transforms of the spatial errors, the time delay errors, and the detector noise, T = sampling time and ∗ represents a convolution. From this theory upper bounds on the deviations in the performance measures of a transversal filter have been determined. We found that low-pass transversal filters are robust with respect to optical roundoff errors. We observed that the use of Hamming and Hann windows can make fiber optic transversal filters more robust.

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Pedoeem, J., S. Abittan, G. Bar Yosef, and S. Keene. "TABS: Transformer Based Seizure Detection." In 2020 IEEE Signal Processing in Medicine and Biology Symposium (SPMB). IEEE, 2020. http://dx.doi.org/10.1109/spmb50085.2020.9353612.

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Lin, Yuzhang, and Ali Abur. "Robust transformer tap estimation." In 2017 IEEE Manchester PowerTech. IEEE, 2017. http://dx.doi.org/10.1109/ptc.2017.7980919.

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Reports on the topic "Transformer Taps"

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Cardoso, Eduardo Luiz, Alex Eckert, and Ana Cristina Fachinelli. Relatório anual do Programa de Pós-Graduação em Administração Universidade de Caxias do Sul RS - Brasil. UCS - Universidade de Caxias do Sul, July 2022. http://dx.doi.org/10.18226/9786500469837.

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Não resta dúvida de que a evolução da humanidade se deve, em grande parte, às descobertas cientícas oriundas de pesquisas dos mais variados ramos do conhecimento. Nesse contexto, as universidades desempenham um importante papel como propulsoras do avanço do conhecimento, visto que participam diretamente dos processos de formação de novos pesquisadores, os quais necessitarão estar preparados para enfrentar os desaos que os aguardam. Alinhado a isso está a missão da Universidade de Caxias do Sul (UCS), direcionada para a produção, sistematização e socialização do conhecimento, com qualidade e relevância, sempre em busca do desenvolvimento sustentável. Aliás, quando se fala em desenvolvimento sustentável, devemos considerar que a sustentabilidade não é uma variável unidimensional, mas sim um elemento a ser abordado nas suas dimensões econômica, social e ambiental. No contexto organizacional, cada vez mais o desenvolvimento e a prosperidade acontecem a partir do momento em que as tomadas de decisão se valem de embasamento cientíco,suportadas com dados concretos e informações devidamente validadas. Com isso, existe uma tendência de que tais decisões tenham uma assertividade cada vez mais alta. Inserido no ambiente da UCS desde o ano de 2006 está o Programa de PósGraduação em Administração – Mestrado e Doutorado (PPGA),cujo propósito é o de capacitar recursos humanos para a pesquisa na área da gestão, preparando-os para atuar tanto na docência quanto nos níveis gerenciais e de liderança nas organizações. Entretanto, mesmo durante o processo de formação, os futuros pesquisadores já estão envolvidos em atividades de pesquisa e de interação com o ambiente externo à universidade, especialmente na solução de problemas organizacionais de diferentes níveis de complexidade. Em vista disso, na busca por uma maior divulgação das atividades realizadas no PPGA ao ambiente externo, emergiu a necessidade da elaboração de um relatório das atividades, o Anuário do PPGA. Nesta que é a segunda edição do referido anuário, além de apresentar algumas informações ordem interna, procurou-se elencar os acontecimentos mais relevantes ocorridos no PPGA no decorrer do ano de 2021, um ano ainda marcado pelas grandes restrições sanitárias. Por m, agradeço a todos que, de alguma forma, ajudaram a construir a história do PPGA e a transformá-lo no que ele representa atualmente.

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Fahima, Tzion, and Jorge Dubcovsky. Map-based cloning of the novel stripe rust resistance gene YrG303 and its use to engineer 1B chromosome with multiple beneficial traits. United States Department of Agriculture, January 2013. http://dx.doi.org/10.32747/2013.7598147.bard.

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Research problem: Bread wheat (Triticumaestivum) provides approximately 20% of the calories and proteins consumed by humankind. As the world population continues to increase, it is necessary to improve wheat yields, increase grain quality, and minimize the losses produced by biotic and abiotic stresses. Stripe rust, caused by Pucciniastriiformisf. sp. tritici(Pst), is one of the most destructive diseases of wheat. The new pathogen races are more virulent and aggressive than previous ones and have produced large economic losses. A rich source for stripe-rust resistance genes (Yr) was found in wild emmer wheat populations from Israel. Original Project goals: Our long term goal is to identify, map, clone, characterize and deploy in breeding, novel wild emmer Yr genes, and combine them with multiple beneficial traits. The current study was aiming to map and clone YrG303 and Yr15, located on chromosome 1BS and combine them with drought resistance and grain quality genes. Positional cloning of YrG303/Yr15: Fine mapping of these genes revealed that YrG303 is actually allelic to Yr15. Fine genetic mapping using large segregating populations resulted in reduction of the genetic interval spanning Yr15 to less than 0.1 cM. Physical mapping of the YrG303/Yr15 locus was based on the complete chromosome 1BS physical map of wheat constructed by our group. Screening of 1BS BAC library with Yr15 markers revealed a long BAC scaffold covering the target region. The screening of T. dicoccoidesaccession-specific BAC library with Yr15 markers resulted in direct landing on the target site. Sequencing of T. dicoccoidesBAC clones that cover the YrG303/Yr15 locus revealed a single candidate gene (CG) with conserved domains that may indicate a role in disease resistance response. Validation of the CG was carried out using EMS mutagenesis (loss-of- function approach). Sequencing of the CG in susceptible yr15/yrG303 plants revealed three independent mutants that harbour non-functional yr15/yrG303 alleles within the CG conserved domains, and therefore validated its function as a Pstresistance gene. Evaluation of marker-assisted-selection (MAS) for Yr15. Introgressions of Yr15 into cultivated wheat are widely used now. Recently, we have shown that DNA markers linked to Yr15 can be used as efficient tools for introgression of Yr15 into cultivated wheat via MAS. The developed markers were consistent and polymorphic in all 34 tested introgressions and are the most recommended markers for the introgression of Yr15. These markers will facilitate simultaneous selection for multiple Yr genes and help to avoid escapees during the selection process. Engineering of improved chromosome 1BS that harbors multiple beneficial traits. We have implemented the knowledge and genetic resources accumulated in this project for the engineering of 1B "super-chromosome" that harbors multiple beneficial traits. We completed the generation of a chromosome including the rye 1RS distal segment associated with improved drought tolerance with the Yr gene, Yr15, and the strong gluten allele 7Bx-over-expressor (7Bxᴼᴱ). We have completed the introgression of this improved chromosome into our recently released variety Patwin-515HP and our rain fed variety Kern, as well as to our top breeding lines UC1767 and UC1745. Elucidating the mechanism of resistance exhibited by Yr36 (WKS1). The WHEAT KINASE START1 (WKS1) resistance gene (Yr36) confers partial resistance to Pst. We have shown that wheat plants transformed with WKS1 transcript are resistant to Pst. WKS1 is targeted to the chloroplast where it phosphorylates the thylakoid-associatedascorbateperoxidase (tAPX) and reduces its ability to detoxify peroxides. Based on these results, we propose that the phosphorylation of tAPX by WKS1 reduces the ability of the cells to detoxify ROS and contributes to cell death. Distribution and diversity of WKS in wild emmer populations. We have shown that WKS1 is present only in the southern distribution range of wild emmer in the Fertile Crescent. Sequence analysis revealed a high level of WKS1 conservation among wild emmer populations, in contrast to the high level of diversity observed in NB-LRR genes. This phenomenon shed some light on the evolution of genes that confer partial resistance to Pst. Three new WKS1 haplotypes displayed a resistance response, suggesting that they can be useful to improve wheat resistance to Pst. In summary, we have improved our understanding of cereals’ resistance mechanisms to rusts and we have used that knowledge to develop improved wheat varieties.

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