scholarly journals Study on Restriking Transient Voltage Characteristics and Waveform Patterns of Planar Copper-Carbon Electrodes using Forms

2020 ◽  
Vol 34 (4) ◽  
pp. 1-6
Author(s):  
Jong-Min Lim ◽  
Chung-Seog Choi
Keyword(s):  
Real Time ◽  
Electric Potential ◽  
Arc Discharge ◽  
Short Circuit ◽  
Carbon Electrodes ◽  
Radiation Patterns ◽  
Voltage Waveform ◽  
Measured Voltage ◽  
Maximum Current ◽  
Transient Voltage

In this study, the authors measured voltage and current waveforms in real time during a serial arc discharge. The analysis results of the arc discharge radiation patterns exhibited intermittent discharge, arc growth, creation of a heat generating area, occurrence of plume, and formation of a red heat area, which proceeded in that order. When the serial arc discharge was introduced, the current and voltage waveforms exhibited periodicity as sine waves. It was also observed that a restriking transient voltage occurred when the waveform changed from positive (+) to negative (-) and vice versa. When the discharge proceeded, the amount of heat generated for 1 s and 600 s was approximately 0.317 mJ, and 190 mJ, respectively. The duration of the short circuit was approximately 1.66 ms, and in the case of the voltage waveform, it was evident that the electric potential increased to 49.9 V in the same cycle. Furthermore, when the discharge proceeded, the effective value (RMS value) of the current was approximately 1.72 A with a maximum current of approximately 2.53 A, whereas the effective value of the voltage was approximately 42.8 V with a maximum of approximately 208 V.

scholarly journals Study on the Analysis of Restrike Pattern and Radial Spectrum of AC Arc Discharge based on the Electrode Material

2021 ◽  
Vol 35 (4) ◽  
pp. 58-64
Author(s):  
Jong-Min Lim ◽  
Chung-Seog Choi
Keyword(s):  
Electrode Material ◽  
Radiation Spectrum ◽  
Arc Discharge ◽  
Waveform Analysis ◽  
Carbon Electrodes ◽  
Half Cycle ◽  
Voltage Waveform ◽  
Copper Electrodes ◽  
Ac Arc ◽  
Ac Arc Discharge

In this study, we designed and fabricated a system based on IEC-62606 and UL-1699 such that stable arc discharge could be produced. AC arc discharge was performed to interpret the restrike pattern and radiation spectrum according to the electrode material. In the voltage waveform analysis of flat copper electrodes, it was analyzed that the accompaniment cycle of the negative waveform was more unstable than the half cycle of the positive waveform. We observed that the radiation spectrum of copper electrodes occurred in the ultraviolet and visible light regions. Moreover, the voltage waveform of the carbon electrode was found to be similar to the pattern produced by the copper electrode. However, we observed that the restrike generated at the half cycle of the negative waveform was produced relatively faster. The radio spectra were strongest near 589 nm, 671 nm, and 766 nm. AC arc discharges using copper electrodes and carbon electrodes were found to be between the arc-discharge patterns of copper electrodes and carbon electrodes. It has been proven that depending on the material of the electrode, there are differences in voltage list like, current patterns, and radiated spectra bands.

scholarly journals Smart Sensors for Smart Grid Reliability

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2187 ◽  
Author(s):  
Monica Alonso ◽  
Hortensia Amaris ◽  
Daniel Alcala ◽  
Diana M. Florez R.
Keyword(s):  
Smart Grid ◽  
Real Time ◽  
Smart Grids ◽  
Short Circuit ◽  
Test System ◽  
Smart Sensors ◽  
Smart Sensor ◽  
Protection Scheme ◽  
Time Operation ◽  
Real Time Operation

Sensors for monitoring electrical parameters over an entire electricity network infrastructure play a fundamental role in protecting smart grids and improving the network’s energy efficiency. When a short circuit takes place in a smart grid it has to be sensed as soon as possible to reduce its fault duration along the network and to reduce damage to the electricity infrastructure as well as personal injuries. Existing protection devices, which are used to sense the fault, range from classic analog electro-mechanics relays to modern intelligent electronic devices (IEDs). However, both types of devices have fixed adjustment settings (offline stage) and do not provide any coordination among them under real-time operation. In this paper, a new smart sensor is developed that offers the capability to update its adjustment settings during real-time operation, in coordination with the rest of the smart sensors spread over the network. The proposed sensor and the coordinated protection scheme were tested in a standard smart grid (IEEE 34-bus test system) under different short circuit scenarios and renewable energy penetration. Results suggest that the short-circuit fault sensed by the smart sensor is improved up to 80% and up to 64% compared with analog electromechanics relays and IEDs, respectively.

scholarly journals RANCANG BANGUN MONITORING DAN PENYIMPANAN NILAI DAYA LISTRIK SECARA REAL TIME PADA BASIS DATA

2018 ◽  
Vol 5 (1) ◽  
pp. 139
Author(s):  
I Dewa Gde Bayu Wiranatha ◽  
Cok Gede Indra Partha ◽  
Widyadi Setiawan
Keyword(s):  
Real Time ◽  
Digital Media ◽  
Electrical Energy ◽  
Current Sensor ◽  
Hotel Management ◽  
Data Recording ◽  
Electrical Energy Consumption ◽  
Energy Monitoring ◽  
Maximum Current ◽  
Access Data

Hotel management to monitor the energy to know the electrical energy consumption at the hotel. Energy monitoring is carried out in order to achieve the efficient use of electrical energy, for accurate energy monitoring requires a tool that can monitor the power consumption in real time and store on digital media or database so easy to access. Data stored on the database using the help of microcontroller and Ethernet Shiled connected to the LAN network. The sensors used in this research are voltage down 220VAC: 9VAC and current sensors with maximum current capacity of 100 A. The result of data recording is the highest current sensor deviation of 2.4% and the highest voltage sensor deviation is 0.4%.

Real-time quantum-accurate voltage waveform synthesis

2020 ◽  
Author(s):  
Jane Ireland ◽  
Stephen Protheroe ◽  
Jonathan Williams ◽  
Allan Belcher ◽  
Ronald Dekker ◽  
...  
Keyword(s):  
Real Time ◽  
Voltage Waveform ◽  
Time Quantum ◽  
Waveform Synthesis

IMAGE RECOVERY OF TRANSIENT VOLTAGE BASED ON REAL-TIME MONITORING

2008 ◽  
Vol 22 (05) ◽  
pp. 353-358 ◽  
Author(s):  
YING LIU ◽  
CHI XIE
Keyword(s):  
Electromagnetic Field ◽  
Real Time ◽  
High Energy Physics ◽  
High Energy ◽  
Image Recovery ◽  
Real Time Monitoring ◽  
Electromagnetic Coils ◽  
Transient Voltage ◽  
Transient Overvoltage ◽  
Energy Physics

In modern high-energy physics, a powerful electromagnetic field must be supplied for some elementary particles to be accelerated by passing through the region of high-energy physics fields. The electric current and high voltage producing the powerful electromagnetic field are very important to high-energy accelerators, but the insulation of electromagnetic coils in the accelerators suffers from electric damage under powerful electricity. Epecially, it may be stricken by transient overvoltage from the a.c. generator or electric network at any time. For the insulation problem of electromagnetic coils in the accelerator stricken by transient overvoltage, based on real-time monitoring and virtual image technique, the image recovery of transient voltage and the insulation safety of electromagnetic coils in the accelerator can be analyzed and predicted on-line.

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