Results 1 to 10 of about 3,070 (167)
DC Transformers in DC Distribution Systems
Energies, 2023 With the rapid development of power electronics technology and its successful application, many demonstration projects of medium/low-voltage DC (M-LVDC) distribution systems have been constructed.
Yangfan Chen, Yu Zhang
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Overview of Research Status of DC Bias and Its Suppression in Power Transformers
Energies, 2022 In this article, the sources of DC bias and its effects on power transformers are first summarized. Secondly, the article classifies and summarizes the current DC bias calculation problems of power transformers, and puts forward some interesting ...
Youliang Sun +3 more
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State Identification of Transformer Under DC Bias Based on Wavelet Singular Entropy
IEEE Access, 2021 To identify the DC bias state of transformers, a DC bias state identification method of transformer based on wavelet singular entropy is proposed in this paper. The vibration principle of transformers under DC bias has been analyzed.
Jun Liu +7 more
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DC-compensated current transformer [PDF]
2014 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, 2014 Instrument current transformers (CTs) measure AC currents. The DC component in the measured current can saturate the transformer and cause gross error. We use fluxgate detection and digital feedback compensation of the DC flux to suppress the overall error to 0.15%.
Pavel Ripka +2 more
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Modular Combined DC-DC Autotransformer for Offshore Wind Power Integration with DC Collection
Applied Sciences, 2022 Offshore wind farms (OWFs) integration are attractive extensively for furnishing more robust power than land wind farms. This paper introduces a modular combined DC-DC autotransformer (MCAT), which contributes to the offshore wind power integration of DC
Yuanjian Song, Zheren Zhang, Zheng Xu
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Metrics and Strategies for Design of DC Bias Resilient Transformers
IEEE Open Access Journal of Power and Energy, 2023 Geomagnetic disturbances (GMDs) give rise to geomagnetically induced currents (GICs) on the earth’s surface which find their way into power systems via grounded transformer neutrals. The quasi-dc nature of the GICs results in half-cycle saturation
Akhil Prasad +3 more
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Design of Power Transformer with Frequency 1 Khz
Communications, 2023 This paper deals with the noise level of power transformers operating at a middle frequency from 800 Hz to 2000 Hz. The factors that influence the noise produced by power transformers are size, design and operating conditions. The research shows that the
Marek Franko +4 more
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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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