An Application of Inrush Current Suppression Technology Based on CNN in Switching Operation of High-voltage Built-in High-impedance Transformer

2018 ◽  
Author(s):  
Qianwen Guo ◽  
Jin Wang ◽  
Fangqing Zheng ◽  
Gang Du ◽  
Lu Zhu ◽  
...  
Keyword(s):  
High Voltage ◽  
Inrush Current ◽  
Switching Operation ◽  
High Impedance

The Feasible Analysis of Transformer Fast Reenergizing with Neutral Point Ungrounded

2013 ◽  
Vol 732-733 ◽  
pp. 958-964
Author(s):  
Yao Zhao ◽  
Yu De Yang ◽  
Yan Hong Pan ◽  
Le Qi
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Low Voltage ◽  
Second Harmonic ◽  
Neutral Point ◽  
Inrush Current ◽  
Differential Protection ◽  
Time Saving ◽  
Magnetizing Inrush Current ◽  
Transformer Differential Protection

The feasibility of transformer fast reenergizing with neutral point ungrounded after the external fault being removed is analyzed in this paper. By calculating overvoltage and discriminating magnetizing inrush current, it analyzes four ways to restore power of transformer and chooses the optimal strategy which is safe and time-saving. The result shows that in the case of transformer neutral point ungrounded, closing the low-voltage circuit side breaker before the high-voltage, which can effectively limit over-voltage in a safe range. The second harmonic characteristic of magnetizing waveform may disappear, while the intermittent angle characteristics are still significant. With the help of the intermittent angle principle, transformer differential protection may not misuse. The average time for each customer interruption is reduced from 40 minutes to 10 minutes and saves an hour for engineer on the way back and forth. It will greatly improve power supply reliability.

Regulating the High-Voltage and High-Impedance Characteristics of Triboelectric Nanogenerator toward Practical Self-powered Sensors

Nano Energy ◽  
2021 ◽  
pp. 106137
Author(s):  
Shan Lu ◽  
Wenqian Lei ◽  
Lingxiao Gao ◽  
Xin Chen ◽  
Daqiao Tong ◽  
...  
Keyword(s):  
High Voltage ◽  
Triboelectric Nanogenerator ◽  
High Impedance ◽  
Impedance Characteristics ◽  
Self Powered

scholarly journals Investigation of Ways to Reduce the Inrush Current when Starting High-Voltage Motors

2021 ◽  
Vol 21 (2) ◽  
pp. 94-104
Keyword(s):  
High Voltage ◽  
High Power ◽  
Oil And Gas ◽  
Supply Voltage ◽  
Electrical Energy ◽  
Oil And Gas Industry ◽  
Energy System ◽  
Energy Performance ◽  
Inrush Current ◽  
Industrial Enterprises

The operation of high-power industrial electrical installations, particularly in metallurgy and the oil and gas industry, is associated with complex technological processes that require increased attention to the equipment used, as such equipment is used in complex and dangerous production conditions and in continuous operation facilities. High-voltage air and gas compressors are objects with increased electrical energy consumption and have significant starting currents. These circumstances affect both the shape of the supply voltage and the state of the energy system in general. Currently, the development of methods for limiting inrush currents is an urgent task for objects used in industrial enterprises. Introducing a compressor into the technological process is sometimes requires prior coordination of its start with the equipment in operation, especially that with a high power consumption. The paper studies the existing control system as well as ways to upgrade the system to improve its energy performance.

Characteristic analysis of zero-mode inrush current of high-impedance transformer

2020 ◽  
Vol 117 ◽  
pp. 105716
Author(s):  
Wenbin Cao ◽  
Xianggen Yin ◽  
Zhe Zhang ◽  
Yuanlin Pan ◽  
Yuxue Wang ◽  
...  
Keyword(s):  
Zero Mode ◽  
Inrush Current ◽  
Characteristic Analysis ◽  
High Impedance

High voltage pulses for high impedance loads using explosive formed fuses

1998 ◽  
Vol 26 (5) ◽  
pp. 1437-1443 ◽  
Author(s):  
J.H. Degnan ◽  
G.F. Kiuttu ◽  
P.J. Turchi ◽  
J.D. Graham ◽  
J.H. Goforth ◽  
...  
Keyword(s):  
High Voltage ◽  
High Impedance ◽  
Voltage Pulses

Comparative Study of SiC MOSFETs in High Voltage Switching Operation

2012 ◽  
Vol 717-720 ◽  
pp. 1081-1084 ◽  
Author(s):  
Tsuyoshi Funaki ◽  
Yuki Nakano ◽  
Takashi Nakamura
Keyword(s):  
Breakdown Voltage ◽  
High Voltage ◽  
Current Density ◽  
Power Device ◽  
Resistive Load ◽  
Density Condition ◽  
Switching Speed ◽  
Switching Operation ◽  
Switching Performance ◽  
Turn On

SiC power device is expected to have high breakdown voltage with low on resistance, which cannot be attainable for conventional Si device. This study evaluates the switching performance of high voltage SiC MOSFETs with comparing to that of conventional Si power MOSFET having equivalent breakdown voltage. To this end, turn-on and turn-off switching operation of MOSFETs are assessed with resistive load for same conduction current density. Though the on resistance of SiC MOSFETs are quite lower than Si MOSFET, especially for trench gate type. But, SiC MOSFETs have larger terminal capacitance. Therefore, SiC MOSFETs show slower switching speed than Si MOSFETs for same current density condition.

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