1,656 resources related to Voltage Transformers
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The Pulsed Power Conference is held on a biannual basis and serves as the principal forum forthe exchange of information on pulsed power technology and engineering.
Energy conversion and conditioning technologies, power electronics, adjustable speed drives and their applications, power electronics for smarter grid, energy efficiency,technologies for sustainable energy systems, converters and power supplies
APEC focuses on the practical and applied aspects of the power electronics business. Not just a power designer’s conference, APEC has something of interest for anyone involved in power electronics including:- Equipment OEMs that use power supplies and converters in their equipment- Designers of power supplies, dc-dc converters, motor drives, uninterruptable power supplies, inverters and any other power electronic circuits, equipments and systems- Manufacturers and suppliers of components and assemblies used in power electronics- Manufacturing, quality and test engineers involved with power electronics equipment- Marketing, sales and anyone involved in the business of power electronic- Compliance engineers testing and qualifying power electronics equipment or equipment that uses power electronics
IEEE International Conference on Plasma Science (ICOPS) is an annual conference coordinated by the Plasma Science and Application Committee (PSAC) of the IEEE Nuclear & Plasma Sciences Society.
The Annual IEEE PES General Meeting will bring together over 2900 attendees for technical sessions, administrative sessions, super sessions, poster sessions, student programs, awards ceremonies, committee meetings, tutorials and more
Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission
The design and manufacture of consumer electronics products, components, and related activities, particularly those used for entertainment, leisure, and educational purposes
Electrical insulation common to the design and construction of components and equipment for use in electric and electronic circuits and distribution systems at all frequencies.
Publishes original and significant contributions relating to the theory, design, performance and reliability of electron devices, including optoelectronics devices, nanoscale devices, solid-state devices, integrated electronic devices, energy sources, power devices, displays, sensors, electro-mechanical devices, quantum devices and electron tubes.
Theory and applications of industrial electronics and control instrumentation science and engineering, including microprocessor control systems, high-power controls, process control, programmable controllers, numerical and program control systems, flow meters, and identification systems.
2016 2nd International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM), 2016
Innovative development of electric power systems is aimed at creating active- adaptive networks. Control of active-adaptive networks is based on usage of primary data measured at voltage and current transformers. In particular, the voltage transformers can be a source of information for devices determining fault location. The problem of fault location (FL) has always been and remains relevant because its ...
2013 IEEE Power & Energy Society General Meeting, 2013
The use of power electronics and other assets with a nonlinear impedance characteristic causes harmonics in the electrical grid which should be monitored to keep the power quality at a high level. System operators connect their secondary equipment mainly to inductive voltage transformers that may have resonances in the frequency range of interest. Therefore, the influence of a voltage transformer ...
2006 IEEE Power Engineering Society General Meeting, 2006
In determining the correct operation of relays of a protection scheme, proper representation of instrument transformers and their behavior in conditions where there can be transient is very critical. This paper presents a simulation model for assessing the transient performance of capacitive voltage transformers (CVTs). In order to test the validity of the developed model, four CVT operational conditions are ...
2008 IEEE Instrumentation and Measurement Technology Conference, 2008
In the paper a low cost method for the compensation of Voltage Transformers (VTs) is proposed. The compensation technique is based on a proper circuit connected to the secondary terminals that, by sensing the VT primary current, generates a voltage that compensates the primary voltage drops. The designed circuit for the compensation is physically separated from the VT, so that ...
2006 IEEE Instrumentation and Measurement Technology Conference Proceedings, 2006
Instrument transformers, namely, current and voltage (potential) transformers are characterized by their ratio and phase errors. A novel virtual instrument that determines the errors of an instrument transformer using a quasi-balance technique is proposed in this paper. Operating on the secondary quantities of the test and standard transformers, two independent quasi-balance conditions are obtained. The errors of the test transformer ...
APEC 2011-Intersil Promo Apec 2011
Overview of UC Berkeley Resistance Grounded Campus Power System
Infineon Technologies: Power Efficiency from Generation to Consumption
IEEE Milestone S&C Electric company
The Josephson Effect: The Josephson Volt
ON-CHIP VOLTAGE AND TIMING DIAGNOSTIC CIRCUITS
Agilent: Test up to 1500 amps and 10,000 volts!
Multi-Standard 5Gbps to 28.2Gbps Adaptive, Single Voltage SerDes Transceiver with Analog FIR and 2-Tap Unrolled DFE in 28nm CMOS: RFIC Interactive Forum 2017
IEEE PELS Webinar Series-Galvanic Isolation for Power Supply Applications
High Frequency Magnetic Circuit Design for Power Electronics
On the Characterization of Thermal Coupling Resistance in a Current Mirror: RFIC Industry Showcase 2016
High Efficiency Supply-Modulated RF Power Amplifier for Handset Applications
A 32GHz 20dBm-PSAT Transformer-Based Doherty Power Amplifier for MultiGb/s 5G Applications in 28nm Bulk CMOS: RFIC Interactive Forum 2017
A 12-b, 1-GS/s 6.1mW Current-Steering DAC in 14nm FinFET with 80dB SFDR for 2G/3G/4G Cellular Application: RFIC Industry Showcase 2017
IEEE Day Future Milestones: 100% Renewable Energy penetration Is Possible
A Fully-Integrated SOI CMOS Complex-Impedance Detector for Matching Network Tuning in LTE Power Amplifier: RFIC Interactive Forum
A Low Power High Performance PLL with Temperature Compensated VCO in 65nm CMOS: RFIC Interactive Forum
ASC-2014 SQUIDs 50th Anniversary: 2 of 6 - John Clarke - The Ubiquitous SQUID
CIRCUIT DESIGN USING FINFETS
Innovative development of electric power systems is aimed at creating active- adaptive networks. Control of active-adaptive networks is based on usage of primary data measured at voltage and current transformers. In particular, the voltage transformers can be a source of information for devices determining fault location. The problem of fault location (FL) has always been and remains relevant because its solution may improve reliability of power supply. Overhead and cable high voltage power lines are most often-damageable elements of the electric power system. Power line cut-off is always accompanied by power undersupply or reduction of its reliability and quality. The paper investigates possibility of using transient voltage parameters obtained by digital voltage transformers for the FL on the cable lines.
The use of power electronics and other assets with a nonlinear impedance characteristic causes harmonics in the electrical grid which should be monitored to keep the power quality at a high level. System operators connect their secondary equipment mainly to inductive voltage transformers that may have resonances in the frequency range of interest. Therefore, the influence of a voltage transformer itself on the PQ measurement has to be assessed, especially since they have some advantages compared to other technologies. Thereby, it is important to be able to measure the frequency response with a low measurement error. As shown in this work, several external factors can influence the measurement results to a great extent. Therefore, it should be known which variables affect the frequency behavior. Several influences are analyzed in this work and their impact on the frequency response is displayed.
In determining the correct operation of relays of a protection scheme, proper representation of instrument transformers and their behavior in conditions where there can be transient is very critical. This paper presents a simulation model for assessing the transient performance of capacitive voltage transformers (CVTs). In order to test the validity of the developed model, four CVT operational conditions are considered using field data collected from one of the Nigerian electric utility 330/132/33 kV substations. The model simulation results revealed various configuration performance responses that could affect relay protection schemes to different degrees. As expected, the CVT responses showed that faults initiated at zero voltage crossing, which is the worst transient condition, produced transient voltage magnitude up to 40% of the nominal voltage while faults initiated at the crest produced minimum transient voltage magnitude. It is shown that the model developed for the selected instrument transformer yielded satisfactory results
In the paper a low cost method for the compensation of Voltage Transformers (VTs) is proposed. The compensation technique is based on a proper circuit connected to the secondary terminals that, by sensing the VT primary current, generates a voltage that compensates the primary voltage drops. The designed circuit for the compensation is physically separated from the VT, so that it proves to be easily employed for enhancing the performance of commercial VT or VT already working on the transmission network. For the measurement of VT primary current, a proper transducer has been designed; it allows the measurement of low current (in the range of milliampere) granting the required insulation between the primary circuit and the measurement section. In order to configure the compensating circuit, the VT primary parameters have to be known; a suitable method, thus, for the characterization of VT, is also proposed.
Instrument transformers, namely, current and voltage (potential) transformers are characterized by their ratio and phase errors. A novel virtual instrument that determines the errors of an instrument transformer using a quasi-balance technique is proposed in this paper. Operating on the secondary quantities of the test and standard transformers, two independent quasi-balance conditions are obtained. The errors of the test transformer are then determined using the two quasi-balance settings alone. The method inherently possesses all the advantages of an ac bridge but dispenses with the tedious iterative balancing. A prototype unit built and tested establishes the practical viability of the proposed technique
The article shows the results of examining ferroresonance phenomena in 220 kV outdoor switchgear (OS). We examined the area of hazardous ferroresonance for NKF-type voltage transformers and open core voltage transformers, and presented a mathematical model developed for 220 kV outdoor switchgear (OS). We have convincingly demonstrated the need for taking into account interphase capacitances in one bus system and different systems during examination of ferroresonance phenomena. On the basis of calculation, we have developed recommendations on the elimination of ferroresonance phenomena on the considered OS. The developed mathematical model of OS and the method of calculating interphase capacitance bus systems using a field mathematical model can be taken as a basis for evaluating the possibility of ferroresonance phenomena at OS 110-500 kV.
RF Voltage transformers operating in one of the ISM frequency bands have recently been demanded in emerging low-power applications, such as wake-up radios in wireless networks, remotely triggered switches, stand-by units in home electronics, etc. S0 Lamb wave resonant (LWR) transformers have been first proposed. Later, SAW transformers designed as “degenerated” CRF have been proposed. Here we demonstrate a tetherless design of efficient LWR transformer and discuss the abilities to boost the voltage gain.
Pongamia oil natural esters extracted from the seeds of Pongamia Pinnata tree and its derivatives are investigated in this study to assess their suitability for use in high voltage transformers as an insulator and coolant, so as to replace the presently used mineral oil. Higher viscosity of such natural esters poses challenges for the heat transfer and impulse voltage performances, which are thought to be the major drawbacks of their use in high voltage transformers. Reducing the viscosity by chemical methods lowers the fire resistance of these natural esters. In order to obtain natural esters having balanced performance i.e. both lower viscosity and higher fire resistance, blends of Pongamia oil and low viscous fatty acid methyl ester, derived from Pongamia oil by a chemical process called trans-esterification, are prepared and their impulse voltage performance assessed. Preliminary studies conducted on Pongamia oil and its derivatives show that they can be an environmentally friendly and economically viable replacement for mineral oil used in high voltage transformers.
A mobile calibration system for in-situ calibration of voltage transformers is analysed with respect to measuring uncertainty under field conditions. The total basic uncertainty is better than /spl plusmn/0.015% respectively /spl plusmn/0.3 mrad. The system has been used to calibrate 570 capacitor voltage transformers.<<ETX>>
This paper presents the measured impedance at the relaying point in the presence of thyristor controlled series compensator (TCSC), one of the series connected flexible alternating current transmission system (FACTS) devices, in the case of inter phase, phase to phase and three phase, faults. The measured impedance at the relaying point itself depends on the power system structural and operational conditions, and especially the fault resistance. In the presence of TCSC at the near end of the line, its compensation degree as well as the distance relay voltage transformers connection point, affects the measured impedance at the relaying point. Here, the measured impedance at the relaying point is calculated due to concerning parameters.
The scope of the guide includes the grounding practices presently used and the practices that were not previously reported. Specifically, the issue of the grounding of cases of electronic transducers is addressed.
This recommended practice presents a number of tests for use in determining the significant parameters and performance characteristics of electronics transformers and inductors. These tests are designed primarily for transformers and inductors used in all types of electronic applications, but they may apply to the other types of transformers of large apparent-power rating used in the electric power utility industry. ...
This standard sets forth bar code label requirements for overhead, pad-mounted, and underground-type distribution transformers and step-voltage regulators. Included herein are requirements for data content, symbology, label layout, print quality, and label life expectancy. This standard assumes the existence of central transformer databases within utility companies so that bar code labels need only carry basic transformer identification data.