Dependence of Partial Discharge and Breakdown Characteristics on Applied Power Frequency in SF6 Gas

1998 ◽  
pp. 295-300
Author(s):  
T. Takahashi ◽  
T. Yamada ◽  
M. Hikita ◽  
H. Okubo
Keyword(s):  
Partial Discharge ◽  
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.

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

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 A Comprehensive Procedure for the Partial Discharge Measurements & Power Frequency Withstand Test on GIS in Transmission Substations

2021 ◽  
Vol 10 (4) ◽  
pp. 124-128
Author(s):  
Mr. Shaik Mohammad Tayyab ◽  
◽  
Prof. K. Chandra Sekhar ◽  
Keyword(s):  
High Voltage ◽  
Power Plants ◽  
Power Transmission ◽  
Partial Discharge ◽  
Life Time ◽  
Power Sector ◽  
Transmission Part ◽  
Huge Impact ◽  
Power Frequency ◽  
Utmost Care

The Transmission part of the power sector is very much important as it deals with the huge losses of the complete power sector. Transmission substations play a key role in the power transmission process since the power generation at the power plants to the final stage at the consumer end utilization. The utmost care should be taken to protect these transmission substations as same as the care is taken to reduce the losses. The substation needs to be protected from blackouts which is the big problem of substations. For this, the substation high voltage equipment’s like GIS & Power Transformers are to be properly installed & energized according to the standards & care is taken for its maintenance. So, during the commissioning process which is after installation & before energization, there are different tests which are performed on high voltage equipment’s, especially the Gas Insulated Switchgear, in which the High Voltage & Partial discharge has huge impact as the ageing and the life time of GIS can be easily assessed & the GIS can be saved from the damage, tripping and the blackout of a substation. The procedure of the high voltage test and the partial discharge tests are clearly explained in this paper.

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