Results 11 to 20 of about 759,653 (297)
DC magnetisation of transformers [PDF]
IEE Proceedings - Electric Power Applications, 2006 A sufficiently high DC component in the current on the secondary side of a transformer causes distortion of the primary side current. Prediction of such distortion relies on the availability of magnetisation curves that extend deep enough into saturation.
Ahfock, A., Hewitt, A. J.
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IET Power ElectronicsThe DC–DC conversion stage of a three‐stage solid‐state transformer is the most challenging due to the combination of high power, medium voltage, and medium frequency. This combination also causes most of the losses in the DC–DC stage.
Saeid Khani +2 more
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Analytical methods for assessing paper degradation In transformers [PDF]
, 2006 Power transformers are essential equipments for distributing electricity. However, maintenance of these equipments is necessary to ensure long working life and to avoid catastrophic incidents.
Christofidis, Stavros
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A Novel DC Bias Suppression Method Considering the Cooperation of Multiple Devices
IEEE Access, 2021 The dc bias phenomenon caused by the excessive current of the neutral point will pose significant threats to the transformers. The conventional suppression method based on capacitive dc blocking device (BD) can prevent dc bias current from penetrating ...
Shumin Ma +6 more
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IEEE Access, 2023 Compared with traditional DC power flow analysis; multi-voltage level DC grid power flow analysis is more complex due to its diverse operation methods. This article proposes the power flow calculation method in multi-voltage level DC grid considering the
Shifeng Ye +3 more
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IEEE Access, 2021 Conventional dc bias suppression strategies mainly rely on a single type of device, such as blocking capacitor or blocking resistance. However, these methods are passive palliatives and cannot restrain dc bias currents from the sources.
Shumin Ma +6 more
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Frequency Characteristics of Power Transformer for Isolated DC-DC Converter [PDF]
IEEE Access, 2022 The operational frequency of a transformer is an important factor in the configuration of an isolated DC-DC converter. However, discussions of this frequency are inadequate. This study focuses on the frequency characteristics of the transformers. The frequency characteristics of the impedance and loss of the transformer were obtained to explain their ...
Takayuki Nakamura, Toshiyuki Murakami
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Energies, 2018 DC bias is a great threat to the safe operation of power transformers. This paper deals with a new vibration-based technique to diagnose DC bias in power transformers.
Xiaowen Wu +6 more
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DC transformer for DC/DC connection in HVDC network [PDF]
2013 15th European Conference on Power Electronics and Applications (EPE), 2013 This paper presents the modeling and control of a multilevel DC/DC bidirectional converter suitable for medium voltage and power applications, with a special interest in wind-power applications. The proposed multilevel topology has a modular structure constituted by base DC/DC converter cells.
M. Jimenez Carrizosa +3 more
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A self-correcting method for bad data in flexible DC line protection based on digital twinning
电力工程技术, 2023 DC line protection is the key to the development of flexible DC grids, and fault identification within 3 ms is required. Existing scholars have proposed a digital twinning based flexible DC line protection method with high speed and sensitivity ...
HE Jinghan +5 more
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