Results 241 to 250 of about 16,886,684 (287)

Difficulties in high frequency transformer modeling

Electric Power Systems Research, 2016
Traditional transformer models available in EMTP-like software packages are not capable of representing transformer behavior during a transient state, which includes high frequencies, since they usually do not adequately take into account the transformer resonant behavior caused by its highly complicated design.
Jurišić, Bruno, Uglešić, Ivo, Xemard, Alain, Paladian, Francoise   +3 more
openaire   +1 more source

High-Voltage, High-Frequency Transformer Design

2012
Conversion of AC mains voltages to a high-voltage (>10 kV), high-power (>10 kW) DC level is a key area of technology which is a requirement in many industrial processes, for example, in particulate emission control using electrostatic precipitators. In the majority of cases, this high-voltage DC requirement is achieved with a singlephase AC regulator ...
Paul Lefley, Philip Devine
openaire   +1 more source

Transformation of plasmid DNA into Streptomyces at high frequency

Nature, 1978
OVER 60% of known antibiotics1 are produced by Streptomyces species, including many substances with valuable clinical and other applications; they therefore have considerable medical, biological and commercial importance. Although the process of gene exchange mediated by conjugation within these actinomycetes is apparently widespread2, the transfer of ...
M J, Bibb, J M, Ward, D A, Hopwood
openaire   +2 more sources

Calculation of Leakage Inductance for High-Frequency Transformers

IEEE Transactions on Power Electronics, 2015
Frequency-dependent leakage inductance is often observed. The high-frequency eddy current effects cause a reduction in leakage inductance. The proximity effect between adjacent layers is responsible for the reduction of leakage inductance. This paper gives a detailed analysis of high-frequency leakage inductance and proposes an accurate prediction ...
Ouyang, Ziwei, Zhang, Jun, Hurley, William Gerard   +2 more
openaire   +1 more source

High voltage, high frequency conversion transformer

IECEC-97 Proceedings of the Thirty-Second Intersociety Energy Conversion Engineering Conference (Cat. No.97CH6203), 2002
A 25 kW, 15 kV output, 50 kHz transformer with 100 kV primary to secondary isolation is described. The transformer will be the central element of a resonant inverter. Six of these resonant inverter outputs will be connected in series to produce 90 kV for an airborne application.
C.S. Kerfoot, M.J. Greif
openaire   +1 more source

Transformer model for high frequencies

IEEE Transactions on Power Delivery, 1988
A method for the development of a high-frequency transformer model for use in an electromagnetic transient program (EMTP) is discussed. A transformer to be modeled is measured, and the results are used to calculate the transfer and admittance functions. Modal analysis is used to determine a no-load network model that can be used in the EMTP.
openaire   +1 more source

High frequency models of PCB-based transformers

Proceedings of the 44th IEEE 2001 Midwest Symposium on Circuits and Systems. MWSCAS 2001 (Cat. No.01CH37257), 2002
An equivalent network of PCB-based transformers with two windings is presented for use at high frequency (some MHz). After raising some criticisms to the traditional high frequency transformer model, a systematic procedure is presented to deduce the inductive and the capacitive coupling model of a two windings transformer.
ARTURI, CESARE MARIO, GANDELLI, ALESSANDRO   +1 more
openaire   +2 more sources

Frequency Characteristics Analysis of High Frequency Current Transformers

Advanced Materials Research, 2014
In this paper, the equivalent model of high frequency current transformers (HFCT) for partial discharge online monitoring and its major parameters’ influence on amplitude-and phase frequency characteristics are derived. An optimized design for HFCT for partial discharge online monitoring is summarized.
Yue Dong, Xiao Xin Chen, Yan Ran Li, Yi Ming Zhang, Chong Wei   +4 more
openaire   +1 more source

Optimal design of high-power, mid-high frequency transformer

Proceedings of 2011 International Conference on Electronic & Mechanical Engineering and Information Technology, 2011
A high-power, mid-high frequency transformer using silicon steel core is designed for a 30kW, 3 kHz switch-mode power supply (SMPS). Based on the area product method (AP method), the material and type of magnetic core are selected. The winding turns and transformer loss are calculated. The wire specifications are decided.
Gang Wang, Huina Yang
openaire   +1 more source

Conjugate Thermal Analysis of a High-Power and High-Frequency Transformer

2010 IEEE Industry Applications Society Annual Meeting, 2010
In this paper, a 3D thermal model that couples thermal and flow fields of a high-power, high-frequency oil-immersed transformer was presented. The thermal model including a set of conservation equations was solved using the finite volume method. The temperature and oil flow velocity distribution are of interest.
Ping-Huey Tang, Chang-Chou Hwang, Cheng-Tsung Liu   +2 more
openaire   +2 more sources