Results 1 to 10 of about 641,410 (267)
Overvoltage Protection for High Frequency High Voltage Power Transformers [PDF]
Eletrônica de Potência, 2019 Transformers with high-voltage operation may have undesired behavior due to the effects of their parasitic elements. In power electronics applications, if the primary voltage has harmonics, transformer resonances may be excited, causing high primary ...
Diego Teruo Mendes de Souza +2 more
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The Research of Voltage Sag and Power Frequency Overvoltage on 110kV Resistance Grounding System
Energy and Power Engineering, 2013 This paper researches the voltage transfer characteristics when one-phase ground fault occurred in the resistance grounding system, by using the theory of the asymmetric variable characteristics and the sequence network analysis of the -11 transformer, and concludes the scope of voltage sag and swell and the degree of power frequency overvoltage and ...
Guo Zeng +3 more
semanticscholar +3 more sources
Research on Power-Frequency Overvoltages of 220 kV Offshore Cable Transmission System in Liaoning Province [PDF]
Journal of Physics: Conference Series, 2023 Abstract Since power-frequency overvoltages can influence the safe operation of the submarine cable transmission system greatly, it is indispensable to calculate the overvoltages that may occur during actual situations. In this study, the power-frequency overvoltages of the offshore oil-gas field group’s submarine cable transmission ...
Wei Duan +6 more
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POWER FREQUENCY OVERVOLTAGES GENERATED BY SOLAR PLANT INVERTERS
RE&PQJ, 2017 A new kind of overvoltage, not covered by present standards, has been detected in solar plants when switching the inverters off. This power frequency overvoltage can be transmitted to the MV network, giving rise to damages to some pieces of low voltage electronic equipment.
null F.J. Pazos +5 more
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Comparing frequency‐dependent and distributed parameter with lumped losses power cable line models for cable insulation coordination against overvoltages [PDF]
IET Science, Measurement & Technology, 2019 Simulations of transients are an obliged step for the insulation coordination of cable lines. Although a frequency‐dependent power cable line model better takes into account real conditions since resistive and inductive parameters vary with frequency, a distributed parameter with lumped losses power cable models can be useful to simplify and give ...
Massimo Marzinotto, Giuseppe Pelliccione
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A Smart Grid Overvoltage Identification System Associated with Partial Discharge Signal and Dielectric Loss Detection [PDF]
Sensors, 2023 Capacitive equipment refers to its insulation design using the principle of capacitance of electrical equipment, mainly by a variety of different capacitive components in series. Most of the equipment in the substation is capacitive equipment.
Guojin Chen +6 more
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Journal of Physics: Conference SeriesAbstract Experimental results indicate that during non-full-phase operation following a single-phase transient grounding fault, power frequency overvoltage occurs in the system. In systems with significant wind power integration, such overvoltage may lead to the disconnection of wind turbines, thereby increasing the probability of ...
Donghui Wang, Zengping Wang, Tong Wang
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Smart Grid, 2017 500 kV输变电工程的线路模型选择对操作过电压有着不同的影响以及实际工程中不同检修方式都对工频过电压有影响，针对上述问题笔者应用PSCAD电磁暂态仿真软件对在Bergeron、Mode Model、Phase Model线路模型下进行仿真验证和分析在十二种检修方式下对工频过电压影响最大的一种方式，通过实际工程说明操作过电压在Mode Model、Phase Model线路模型下更接近实际。对于双回路的输变电工程在不同检修方式下，对于其中一条线路分析，与它相邻线路检的修对其工频过电压影响最严重，在实际工程中，工作人员应该多加注意。笔者通过以上分析对500 kV实际输变电工程启动和检修有一定的指导意义。 The line model selection of 500 kV transmission ...
小龙 王
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Study of Power Frequency Overvoltage Suppression on UHV Transmission Line
Kongzhi Yu Xinxi Jishu, 2014 It mainly studied the improvement measures of overvoltage level for UHV transmission line from Jindongnan to Jingmen. It analyzed single-phase grounding load shedding overvoltage and fault-free load shedding overvoltage in the case of the single ...
HAN Mengmeng +3 more
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Simulation and Experimental Research on Overvoltage Measurement of Hybrid CVT [PDF]
E3S Web of Conferences, 2021 The CVT equipment running on site is slightly modified to form a hybrid CVT to achieve transient overvoltage measurement, which is theoretically feasible and practical.
Nie Yu +3 more
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