Non-intrinsic differential mode noise caused by ground current in an off-line power supply

2002 ◽  
Author(s):  
Dongbing Zhang ◽  
Dan Chen ◽  
D. Sable
Keyword(s):  
Power Supply ◽  
Differential Mode ◽  
Ground Current

scholarly journals MINIMIZATION OF THE DIFFERENTIAL MODE PULSE INTERFERENCE IN THE SPACECRAFT POWER SUPPLY BUS BY VARYING ITS LENGTH USING GENETIC ALGORITHM

2020 ◽  
Vol 8 (4) ◽  
pp. 012-018
Author(s):  
Rustam R. Gazizov ◽  
◽  
Ruslan R. Gazizov ◽  
Timur T. Gazizov ◽  
◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Power Supply ◽  
Differential Mode ◽  
Pulse Interference

В работе показана актуальность выявления и локализации экстремумов сигнала вдоль проводников многопроводных линий передачи МПЛП. Выполнена оптимизация длины силовой шины электропитания (СШЭП) космического аппарата по критерию минимизации наибольшего напряжения в СШЭП. Использовано дифференциальное воздействие трапециевидного импульса. Выполнено сравнение двух подходов к оптимизации длины СШЭП с помощью генетического алгоритма (ГА), отличающиеся разным набором особей и поколений. Показано, что при одинаковом количестве итераций ГА, выбор значений особей и поколений влияет незначительно. С помощью ГА удалось уменьшить максимальное значение напряжения в 270 раз.

scholarly journals The resistive ground fault of PWM voltage inverter in the EV charging station

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Marta Zurek-Mortka ◽  
Jerzy R. Szymanski
Keyword(s):  
Power Supply ◽  
Common Mode ◽  
Voltage Inverter ◽  
Frequency Converters ◽  
Charging Station ◽  
Ground Fault ◽  
A Value ◽  
Ground Current ◽  
Voltage Frequency ◽  
Flow Through

AbstractDuring the direct touch of the inverter output voltage or with the ungrounded shield of the cable connecting the inverter to the motor or other type of load, the nonsinusoidal ground currents with a basic harmonic frequency between 1.5 and 16 kHz, flow via a human’s body. Here was proved that Residual Current Device (RCD) ($$I_{\triangle n}$$ I ▵ n = 30 mA) does not switch off the power supply when a ground current with a value of about some hundred milliamps occurs. Because RCDs do not disconnect the power supply, the touch on the inverter’s voltage is dangerous to health and life. For the authors, the RCD usage in the Voltage Frequency Converters (VFCs) is not a good engineer practice when high-frequency common-mode distortion currents flow through it. The paper presents tests of RCD operation in the event of a resistance ground fault (via human body) during EV battery charging where the PWM voltage inverter is connected to the external rectifier to provide DC charging battery voltage. Finally, the authors propose a method of eliminating common-mode (CM) current from short protection system by using a separate circuit in which the parasitic leakage current omits an RCD.

scholarly journals The Resistive Ground Fault of PWM Voltage Inverter In The EV Charging Station

2021 ◽  
Author(s):  
Marta Zurek-Mortka ◽  
Jerzy Ryszard Szymański
Keyword(s):  
Power Supply ◽  
Harmonic Frequency ◽  
Frequency Converters ◽  
Charging Station ◽  
Ground Fault ◽  
A Value ◽  
Ground Current ◽  
Voltage Frequency ◽  
Ev Charging ◽  
Current Device

Abstract During the direct touch of the inverter output voltage, the nonsinusoidal ground currents with a basic harmonic frequency between 1.5 kHz and 16 kHz, flow via a human’s body. Here was proved that Residual Current Device (RCD) type AC/IΔn = 30 mA does not switch off the power supply when a ground current with a value of about some hundred milliamps occurs. Because RCDs do not disconnect the power supply, the touch on the inverter’s voltage is dangerous to the health and life. For the authors, RCD usage in Voltage Frequency Converters is not a good engineer practice. The article presents tests of RCD operation in the event of a ground fault during EV battery charging.

Research on Capacitance Current Treatment Methods in Mine High-Voltage Power Grid

2012 ◽  
Vol 229-231 ◽  
pp. 1021-1024
Author(s):  
Dan Xu ◽  
Na Guo
Keyword(s):  
Coal Mine ◽  
Power Supply ◽  
Single Phase ◽  
Current Treatment ◽  
Automatic Tracking ◽  
Ground Fault ◽  
Arc Suppression Coil ◽  
Testing Data ◽  
Ground Current ◽  
Capacitance Current

In view of the coal mine neutral point ungrounded system when single-phase ground fault occurs, the grounding capacitance current is too big affect the security of coal mine powe supply.The paper analyzed testing data of capacitance current of coal mine network, established a treating scheme of capacitance current according to evaluating results, namely automatic tracking compensation arc suppression coil devices. The running results show that the scheme limits the size of the ground current and decreases rate of accidents of arc grounding over-voltage, which is good for improving the power supply safety.

New replica method with plasma polymerized film by glow discharge

1988 ◽  
Vol 46 ◽  
pp. 414-415
Author(s):  
A. Tanaka ◽  
M. Yamaguchi ◽  
T. Hirano
Keyword(s):  
Power Supply ◽  
Plasma Polymerization ◽  
Vacuum Chamber ◽  
Complex Surface ◽  
Replica Method ◽  
Metal Extraction ◽  
High Voltage Power Supply ◽  
Negative Glow ◽  
Hydrocarbon Gas ◽  
Hydrocarbon Molecules

The plasma polymerization replica method and its apparatus have been devised by Tanaka (1-3). We have published several reports on its application: surface replicas of biological and inorganic specimens, replicas of freeze-fractured tissues and metal-extraction replicas with immunocytochemical markers.The apparatus for plasma polymerization consists of a high voltage power supply, a vacuum chamber containing a hydrocarbon gas (naphthalene, methane, ethylene), and electrodes of an anode disk and a cathode of the specimen base. The surface replication by plasma polymerization in negative glow phase on the cathode was carried out by gassing at 0.05-0.1 Torr and glow discharging at 1.5-3 kV D.C. Ionized hydrocarbon molecules diffused into complex surface configurations and deposited as a three-dimensionally polymerized film of 1050 nm in thickness.The resulting film on the complex surface had uniform thickness and showed no granular texture. Since the film was chemically inert, resistant to heat and mecanically strong, it could be treated with almost any organic or inorganic solvents.

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