Partial discharge energy measurements on electrical machine insulation when energised at frequencies between 0.1 Hz and power frequency

1978 ◽  
Author(s):  
R. Miller ◽  
I. A. Black
Keyword(s):  
Partial Discharge ◽  
Electrical Machine ◽  
Discharge Energy ◽  
Power Frequency

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 Study on the Correlation between Partial Discharge Energy and SF6 Decomposition Gas Generation

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4655
Author(s):  
Yong Sung Cho ◽  
Tae Yoon Hong ◽  
Young Woo Youn ◽  
Jong Ho Sun ◽  
Se-Hee Lee
Keyword(s):  
Partial Discharge ◽  
Surface Discharge ◽  
Discharge Energy ◽  
The Finite Element Method ◽  
Gas Generation ◽  
Energy Effect ◽  
Sf6 Decomposition ◽  
Maintenance Process ◽  
The Relationship

In this paper, the amount of SF6 decomposition gases due to the partial discharge (PD) was studied in the SF6 gas-insulated transformer. The long-term PD degradation experiment was performed while controlling the discharge magnitude using the surface discharge, and the gas generation amount was measured by using gas chromatography for SO2F2, SOF2, SO2, CO, and CF4. In addition, to investigate the relationship between the partial discharge energy and the decomposed gas generation amount, partial discharge energy was calculated by a data processing program and converted to the unit of joule per mole. With the finite element method (FEM), the electric field distribution and SF6 gas decomposition mechanism were explained for the partial discharge energy effect on the gas generation. This study helps understand the relationship between the partial discharge energy and the decomposed gas generation ratio with the experimental results and can be used for the diagnosis of PD and maintenance process for the gas-insulated transformers.

The use of power frequency current transformers as partial discharge sensors for underground cables

2013 ◽  
Vol 20 (3) ◽  
pp. 814-824 ◽  
Author(s):  
F. P. Mohamed ◽  
W. H. Siew ◽  
J. J. Soraghan ◽  
S. M. Strachan ◽  
J. Mcwilliam
Keyword(s):  
Partial Discharge ◽  
Current Transformers ◽  
Underground Cables ◽  
Power Frequency ◽  
Frequency Current
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