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High-frequency oscillations in a power transformer [PDF]

2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230), 2002
Power transformers are widely used as step-up or step-down devices and they can offer galvanic isolation between the input of the power supply and the output. When the operating frequency is considerably high, transformer parasitics are of importance. Interleaving of the transformer windings causes a reduction of the leakage inductance.
G.D. Dernetriades, S.N. Manias, P. Ranstad   +2 more
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Frequency Range of UHF PD Measurements in Power Transformers [PDF]

Energies, 2023
Although partial discharge (PD) measurement is a well-accepted technology to assess the quality of the insulation system of power transformers, there are still uncertainties about which frequency range PDs radiate and which frequency range should be ...
Stefan Tenbohlen, Chandra Prakash Beura, Wojciech Sikorski   +2 more
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High frequency transformer modeling

ISCAS 2001. The 2001 IEEE International Symposium on Circuits and Systems (Cat. No.01CH37196), 2002
This paper presents a technique of indirect measurement of linear and nonlinear elements of a wideband transformer using the reflection coefficient technique with the scattering matrix (S-parameters). The S-parameter frequency domain measurement method of the wideband RF transformer and conversion into a discrete model is discussed. The leakage and the
Janusz Biernacki, Dariusz Czarkowski
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High frequency transformation ofKalanchoe laciniata

Plant Cell Reports, 1989
Leaf explants ofKalanchoe laciniata were cocultivated for different days (2, 4, 6 and 8 days) with disarmedAgrobacterium tumefaciens strains A208SE, GV3111SE and EHA101 carring a binary vector pROA93. The vector contains a cauliflower mosaic virus 35S promotor which drives the coding sequence of neomycin phosphotransferase II (NPT-II) in one direction ...
S R, Jia, M Z, Yang, R, Ott, N H, Chua
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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 frequency-selectivity impedance transformer

2015 IEEE Radio and Wireless Symposium (RWS), 2015
This paper presents the design of an impedance transformer (IT) with high selectivity and wide out-of-band suppression characteristics. The proposed IT provides two transmission poles in the passband and a sharp frequency selective characteristic. For validation, a 50-to-20 Ω IT has been implemented at a center frequency (f 0 ) of 2.6 GHz.
Phirun Kim, Girdhari Chaudhary, Junsik Park, Yongchae Jeong, Jongsik Lim   +4 more
openaire   +1 more source

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

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
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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
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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