Results 11 to 20 of about 6,327 (313)
IEEE Access, 2021 Loss and temperature increase due to DC bias occurring in power transformers may lead to damage and reduced lifespan. To study the influence of different levels of DC bias on the temperature rise in transformer structural components, 0, 8, and 16 A DC ...
Mingyang Li +4 more
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Challenges in All-DC Offshore Wind Power Plants
Energies, 2021 As the size and distance from shore of new offshore wind power plants (OWPPs) increase, connection to shore using high-voltage (HV) direct-current (DC) technology becomes more cost-effective.
Alessandra Follo +3 more
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e-Prime: Advances in Electrical Engineering, Electronics and Energy, 2023 The flow of quasi-DC or DC in AC networks may trigger half-cycle saturation of electrical grid transformers that could lead to their internal heating or grid collapse.
Moazzam Nazir +2 more
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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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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.
Carrizosa, Jimenez +3 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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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 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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IEEE Access, 2020 The main dielectric medium in converter transformers is the oil-pressboard. The valve windings of converter transformers are subjected to AC-DC combined voltage. Creepage discharge is a common defect of oil-pressboard insulation.
Peng Zhou +5 more
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