Results 11 to 20 of about 9,388 (253)
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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Diagnosis of DC Bias in Power Transformers Using Vibration Feature Extraction and a Pattern Recognition Method [PDF]
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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Transformation of conventional transformers for enhanced DC mitigation in AC power networks with advanced grid support [PDF]
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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An asymmetrical quadruple active bridge series resonant DC–DC converter for modular solid‐state transformers [PDF]
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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Combination Optimization Configuration Method of Capacitance and Resistance Devices for Suppressing DC Bias in Transformers [PDF]
Energies, 2019 The ground current of a high-voltage direct current (HVDC) transmission system can cause DC bias in transformers near the grounding electrode during monopole operations, which affects the alternating current (AC) power system operation. Owing to multiple
Donghui Wang, Chunming Liu
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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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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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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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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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