Limiting Characteristics of Capacitor Discharge Current of MMC-based System using the SFCL on Short Circuit

2022 ◽  
pp. 1-1
Author(s):  
Geon-woong Kim ◽  
Hyo-Sang Choi
Keyword(s):  
Discharge Current ◽  
Short Circuit ◽  
Capacitor Discharge

Normalization of Capacitor-Discharge I2t by Short-Circuit Fault in VSC-based DC System

2021 ◽  
pp. 1-1
Author(s):  
Seong-Yong Lee ◽  
Young-kwang Son ◽  
Hyung-June Cho ◽  
Seung-Ki Sul AE
Keyword(s):  
Short Circuit ◽  
Capacitor Discharge ◽  
Dc System ◽  
Short Circuit Fault

scholarly journals Sistem Proteksi Power Supply Modul Praktikum Teknik Digital

2015 ◽  
Vol 2 (3) ◽  
pp. 156
Author(s):  
Anwar Mujadin
Keyword(s):  
Response Time ◽  
Power Supply ◽  
Electronic Circuit ◽  
Short Circuit ◽  
Protection System ◽  
Capacitor Discharge ◽  
Voltage Comparator ◽  
Filter Capacitor ◽  
Experiment Module

<p><em>Abstrak<strong> – </strong></em><strong><em>Dalam melakukan praktikum teknik digital berbasis protoboard kadangkala pihak pengguna melakukan kesalahan fatal yaitu terjadi hubung singkat power supply dalam interkoneksi. Untuk menghindari kerusakan power supply akibat hubung singkat dalam modul praktikum digital, diperlukan sebuah rangkaian elektronika yang mampu mendeteksi dan memutus arus  sumber (power supply) dengan segera pada saat terjadi hubung singkat.</em></strong> <strong><em>Modul praktikum teknik digital dalam penelitian ini telah dilengkapi dengan sistem proteksi power supply dari hubung singkat dengan waktu tanggap kurang dari 5 ms, menggunakan teknis waktu jeda pengosongan kapasitor dan opamp pembanding tegangan.</em></strong><strong><em> </em></strong></p><p><strong><em> </em></strong></p><p><em>Abstract<strong> – When conducting experiments practicum in digital protoboard base project, users often made a fatal mistake that cause short circuit interconnection. To avoid damaging the power supply of experiment module (hardware), it requires an electronic circuit that is able to detect and cut off the main power supply immediately. In research the modular lab has been equipped with an electronics short circuit protection system with a response time of less than 5 ms, using capacitor discharge and opamp voltage comparator technique. </strong></em></p><p><strong><em> </em></strong></p><p><strong><em>Keyword – </em></strong><em>RC Transient, Power Supply Protection</em><em> Systems, Bypass Filter Capacitor.</em></p>

scholarly journals Firing Performance of Microchip Exploding Foil Initiator Triggered by Metal-Oxide-Semiconductor Controlled Thyristor

Micromachines ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 550
Author(s):  
Ke Wang ◽  
Peng Zhu ◽  
Cong Xu ◽  
Qiu Zhang ◽  
Zhi Yang ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Ball Milling ◽  
Short Circuit ◽  
Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Small Scale ◽  
Capacitor Discharge ◽  
Discharge Performance ◽  
Microfluidic Technology ◽  
Discharge Unit

In this paper, microchip exploding foil initiators were fabricated by micro-electro-mechanical system scale fabrication methods, such as magnetron sputtering, photolithography, and chemical vapor deposition. A small-scale capacitor discharge unit based on the metal-oxide-semiconductor controlled thyristor was designed and produced to study the performance of the microchip exploding foil initiator. The discharge performance of the capacitor discharge unit without load and the effect of protection devices on the metal-oxide-semiconductor controlled thyristor were studied by the short-circuit discharge test. Then, the electric explosion characteristic of the microchip exploding foil initiator was also conducted to study the circuit current, peak power, deposited energy, and other parameters. Hexanitrostilbene refined by ball-milling and microfluidic technology was adopted to verify the initiation capability of the microchip exploding foil initiator triggered by the metal-oxide-semiconductor controlled thyristor. The results showed that the average inductance and resistance of the capacitor discharge circuit were 22.07 nH and 72.55 mΩ, respectively. The circuit peak current reached 1.96 kA with a rise time of 143.96 ns at 1200 V/0.22 μF. Hexanitrostilbene fabricated by ball-milling and microfluidic technology was successfully initiated at 1200 V/0.22 μF and 1100 V/0.22 μF, respectively.

Current frequency effect on electromagnetic tube expansion

2020 ◽  
Vol 234 (23) ◽  
pp. 4636-4644
Author(s):  
SK Dond ◽  
Hitesh Choudhary ◽  
Biswaranjan Dikshit ◽  
Tanmay Kolge ◽  
Archana Sharma
Keyword(s):  
Simulation Model ◽  
Discharge Current ◽  
Skin Depth ◽  
Process Efficiency ◽  
Frequency Effect ◽  
Forming Process ◽  
Optimum Frequency ◽  
Current Frequency ◽  
Capacitor Discharge ◽  
Tube Expansion

The frequency of capacitor discharge current is an important parameter in the electromagnetic forming process. In the present work, simulation and experimental study of electromagnetic expansion is carried out on aluminium tubes (Al 5052). The aim is to obtain the optimum frequency of discharge current that gives maximum tube expansion at constant discharge energy. A two-dimensional axisymmetric numerical simulation model is developed that couples electromagnetic and structural phenomenon sequentially. After validating experimental tube expansion results with numerical results, the simulation model is used to analyse the effect of variation in current frequency on the tube expansion. It is observed that maximum tube expansion and higher process efficiency occurred at 5 kHz, which is considered as the optimum frequency for the used experimental set-up. In contrast to sheet forming case observed in the literature, results of tube expansion show that maximum forming is obtained at a frequency where the ratio of skin depth to tube thickness is less than 1. It is also noticed that the optimum frequency depends on the inductance and resistance of the system.

Preparation and Performance of 100Ah Li-Ion Battery with LiFePO4 as Cathode Material

2012 ◽  
Vol 463-464 ◽  
pp. 753-759
Author(s):  
Jing Li ◽  
Yue Li Song
Keyword(s):  
Discharge Current ◽  
Solid Phase ◽  
Retention Rate ◽  
Short Circuit ◽  
Specific Capacity ◽  
Electrode Polarization ◽  
Li Ion Battery ◽  
Electrode Coating ◽  
Li Ion ◽  
Lifepo4 Battery

The 100Ah Li-ion battery with LiFePO4 material as cathod materails is fabricated by laminated electrode technique. The key preparation techniques of preparating battery is optimized in this paper.The examinations results indicate that it is an effective method to improve electric performance of battery by VGCF addition in the cathode activated materials; Solid phase mixing technique can obviously improve the electrode coating effect and reduce the electrode polarization effect.When the catthod electrode surface density is kept as 2.4 g.dm2-, and pressing density is kept as 2.6 g/cm3-, the largest capacity of the battery is105.56 Ah at the 0.5C discharge current, and the specific capacity of cathod LiFePO4 materials is 135.84mAh/g; There is above 98% capacity retention rate of LiFePO4 battery after 200 cycles at 0.5C discharge current. After the safety examinations including overfilling, short circuit, extrusion and needle-punching, prepared LiFePO4 battery shows its desirable safty performance.

scholarly journals Influence Analysis of Current Limiting Reactor on Pole-to-Pole Short Circuit Fault in DC Distribution System

2021 ◽  
Vol 256 ◽  
pp. 01032
Author(s):  
Zhenyu Wang ◽  
Shouxiang Wang ◽  
Qi Liu ◽  
Chunyu Zhang ◽  
Qianyu Zhao ◽  
...  
Keyword(s):  
Distribution System ◽  
Short Circuit ◽  
Fault Current ◽  
Capacitor Discharge ◽  
Fault Type ◽  
Dc Distribution ◽  
Current Limiting ◽  
Fault Mechanism ◽  
Short Circuit Fault ◽  
A Current

With the development of power electronic technology, flexible DC distribution system has gradually become a research hotspot. Pole-to-pole short circuit fault is the most serious fault type in DC distribution system. When pole-to-pole short circuit fault occurs in DC side, it will produce a large fault current, which will cause serious harm to DC distribution system. Therefore, it is urgent to install current limiting reactor to limit fault over-current. Aiming at the DC distribution system based on half bridge MMC, this paper analyses the fault mechanism and fault characteristics of pole-to-pole short circuit fault, studies the current limiting effect of the installation position and capacity of current limiting reactor on fault current, and carries out simulation verification in PSCAD / EMTDC platform. The analysis and simulation results show that installing a current limiting reactor at the outlet of the DC side can reduce the peak value of capacitor discharge current, and installing a current limiting reactor at the outlet of the AC side can reduce the overall amplitude of fault current.

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