scholarly journals Study on Partial Discharge Characteristics of C6F12O Mixed Gas

2021 ◽  
Author(s):  
Xiajin Rao ◽  
Dajian Li ◽  
Xiaofei Xia ◽  
Yi Su ◽  
Yufeng Lu ◽  
...  
Keyword(s):  
Breakdown Voltage ◽  
Low Voltage ◽  
Partial Discharge ◽  
Buffer Gas ◽  
Mixing Ratio ◽  
Mixed Gas ◽  
Discharge Characteristics ◽  
Power Frequency ◽  
The Difference ◽  
Inception Voltage

Abstract The greenhouse effect of SF6 increasingly limits its application in various gas insulated equipment. C6F12O combines the advantages of insulation resistance, safety and environmental protection. When mixed with buffer gas, C6F12O is considered to have potential application prospects in medium and low voltage equipment. In this paper, about the partial discharge characteristics of the mixed gas, an experimental study was carried out. The partial discharge initiation voltage and discharge extinction voltage of mixed gas under power frequency voltage are measured and compared with the breakdown voltage. The results show that with the increase of mixing ratio, the partial discharge initiation voltage and extinction voltage of mixed gas gradually increase, and the effect of gas pressure on high mixing ratio is obvious. The difference between the partial discharge inception voltage and the breakdown voltage is larger than that of pure N2. The research in this paper can provide an important reference for the application, operation and protection of C6F12O mixed gas in medium and low voltage equipment.

scholarly journals Partial discharge characteristics of C6F12O/CO2 mixed gas at power frequency AC voltage

AIP Advances ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 095057 ◽  
Author(s):  
Shuangshuang Tian ◽  
Xiaoxing Zhang ◽  
Yang Wang ◽  
Xiajin Rao ◽  
Fanchao Ye ◽  
...  
Keyword(s):  
Partial Discharge ◽  
Mixed Gas ◽  
Discharge Characteristics ◽  
Power Frequency

scholarly journals The Influence of Nanoparticles’ Conductivity and Charging on Dielectric Properties of Ester Oil Based Nanofluid

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6540
Author(s):  
Konstantinos N. Koutras ◽  
Ioannis A. Naxakis ◽  
Eleftheria C. Pyrgioti ◽  
Vasilios P. Charalampakos ◽  
Ioannis F. Gonos ◽  
...  
Keyword(s):  
Breakdown Voltage ◽  
Partial Discharge ◽  
Al2o3 Nanoparticles ◽  
Sic Nanoparticles ◽  
Base Oil ◽  
Dielectric Performance ◽  
Lightning Impulse ◽  
The Stability ◽  
Inception Voltage ◽  
Natural Ester

This study addresses the effect of nanoparticles’ conductivity and surface charge on the dielectric performance of insulating nanofluids. Dispersions of alumina and silicon carbide nanoparticles of similar size (~50 nm) and concentration (0.004% w/w) were prepared in natural ester oil. The stability of the dispersions was explored by dynamic light scattering. AC, positive and negative lightning impulse breakdown voltage, as well as partial discharge inception voltage of the nanofluid samples were measured and compared with the respective properties of the base oil. The obtained results indicate that the addition of SiC nanoparticles can lead to an increase in AC breakdown voltage and also enhance the resistance of the liquid to the appearance of partial discharge. On the other hand, the induction of positive charge from the Al2O3 nanoparticles could be the main factor leading to an improved positive Lightning Impulse Breakdown Voltage and worse performance at negative polarity.

scholarly journals Resonant Power Frequency Converter and Application in High-Voltage and Partial Discharge Test of a Voltage Transformer

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 2014
Author(s):  
Banyat Leelachariyakul ◽  
Peerawut Yutthagowith
Keyword(s):  
High Voltage ◽  
Noise Level ◽  
Background Noise ◽  
Low Voltage ◽  
Frequency Converter ◽  
Partial Discharge ◽  
Voltage Source ◽  
Voltage Transformer ◽  
Background Noise Level ◽  
Power Frequency

This paper presents application of a resonant power frequency converter for high-voltage (HV) and partial discharge (PD) test of a voltage transformer. The rating voltage, power, and frequency of the system are 70 kVrms, 40 kVA, and 200 Hz, respectively. The testing system utilized the converter feeding to an HV testing transformer connected to a conventional partial discharge detection system. The converter system comprising a rectifier and insulated-gate bipolar (IGBT) switches with the H-bridge configuration was applied as a low-voltage source instead of a conventional motor-generator test set which requires large space and high cost. The requirements of the test according to the standards are quality of the test voltage and the background noise level. The required voltage must have the different voltage (DV) and total harmonic distortion (THDv) in the acceptable values of less than 5%. The DV is defined as the difference of the root mean square and peak voltages in percent. The required background noise level must be lower than 2.5 pC. Simulations and experiments were performed for verification of the developed system performance in comparison with those of the previously developed system based on the pulse width modulation converter. It is found that the developed system can provide the testing voltage with the DV and the THDv of lower than 1% and the background noise level of lower than 1 pC. Considering this achievement of promising performance, the developed system is an attractive choice for the HV and PD testing of voltage transformers in real practice.

scholarly journals Review of Partial Discharge Activity Considering Very-Low Frequency and Damped Applied Voltage

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 440
Author(s):  
Mohamad Ghaffarian Niasar ◽  
Xiaolei Wang ◽  
Respicius Clemence Kiiza
Keyword(s):  
Partial Discharge ◽  
Time Lag ◽  
Low Frequency ◽  
Research Field ◽  
Very Low Frequency ◽  
Main Development ◽  
Charge Decay ◽  
Power Frequency ◽  
Statistical Time ◽  
Inception Voltage

When detecting the presence of partial discharge (PD) activity in the insulation system in high-voltage equipment, the excitation voltages at variable frequency have been widely used instead of power-frequency (50/60 Hz) sinusoidal voltage in order to reduce the charging power. This work reviews the relevant research on PD activity at very low frequency (VLF) method, including sinusoidal or cosine-rectangular voltage shape, and damped AC (DAC) method. Based on the research history and development status, some major PD characteristics, such as PD inception voltage (PDIV), PD amplitude, PD charge, PD phase-resolved pattern, and several hot issues, such as surface charge decay and statistical time lag, have been discussed. Moreover, the advantages, disadvantages, and applied conditions of two reviewed methods has been summarized. Finally, the prospects have been made on the main development trends of this research field in the future.

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