Effect of Pore Size on Partial Discharge in Ultra-High Voltage Ceramic Capacitors

2017 ◽  
Vol 726 ◽  
pp. 235-239
Author(s):  
J.J. Chen ◽  
Jian Yong Zhuang ◽  
Ying Lun Hong ◽  
Jin Tao Huang
Keyword(s):  
Pore Size ◽  
Equivalent Circuit ◽  
High Voltage ◽  
Partial Discharge ◽  
Ultrasonic Detection ◽  
Discharge Characteristics ◽  
Large Pore ◽  
Ceramic Capacitors ◽  
Inception Voltage ◽  
Ultra High Voltage

Effect of pore size on partial discharge in ultra-high voltage ceramic capacitors was investigated. Nondestructive ultrasonic detection was used to measure pore size in ceramics while the partial discharge characteristics were evaluated by a discharge detector. It is found that the partial discharge quantity and discharge inception voltage greatly depend on the size of the biggest pore in the ceramic. The partial discharge characteristics become worse when the inner pore is bigger. Possible explanation is discussed based on an equivalent circuit simulating the capacitor with one large pore.

scholarly journals Dependence of the Partial Discharge Characteristics of Ultra-high Voltage Cable Insulators on the Measuring Temperature

2008 ◽  
Vol 9 (5) ◽  
pp. 186-192 ◽  
Author(s):  
Jong-Yeol Shin ◽  
Hee-Doo Park ◽  
Hyuk-Jin Lee ◽  
Kang-Won Lee ◽  
Won-Jong Kim ◽  
...  
Keyword(s):  
High Voltage ◽  
Partial Discharge ◽  
Discharge Characteristics ◽  
Ultra High Voltage

scholarly journals Research of partial discharge characteristics features in bushings

2021 ◽  
pp. 26-32
Author(s):  
D. A. Polyakov ◽  
◽  
N. A. Tereshchenko ◽  
K. I. Nikitin ◽  
◽  
...  
Keyword(s):  
High Voltage ◽  
Partial Discharge ◽  
Test Time ◽  
Test Results ◽  
High Voltage Electrode ◽  
Discharge Characteristics ◽  
Measurement And Analysis ◽  
Defect Localization ◽  
Sharp Edges ◽  
Discharge Patterns

The paper is devoted to partial discharge measurement and analysis in switchgear bushings. PD bushing structure analysis is described to assess possible defect sources in bushings. An experimental 10 kV bushing sample with the natural defect is obtained from the bushings’ manufacturer. It is tested using the PD measurement technique. Test results showed significant PD intensity at voltages from 12 kV and higher. We have an assumption that a part of registered discharges occurred in the air close to the high voltage electrode sharp edges. To check this assumption we grind them off and repeated the test. The second test does not show considerable PD characteristics change. Therefore, we assume that the bushing sample has an inner defect because the bushing’s surface is not contaminated to generate surficial discharges. The bushing is researched by a destroying method for defect localization. However, inside the bushing, possible defect locations are not found. It might be connected with the fact that the defect could not be found visually at the test time or the defect is located in the gasket between the high voltage electrode and insulator’s body. Besides, there are determined features of phase-resolved partial discharge patterns in switchgear bushings.

scholarly journals Experimental determination of partial discharges in a model of a digital instrument transformer by differential method

Vestnik IGEU ◽  
2019 ◽  
pp. 32-42
Author(s):  
A.V. Gusenkov ◽  
V.D. Lebedev ◽  
S.N. Litvinov ◽  
S.A. Slovesny ◽  
A.A. Yablokov
Keyword(s):  
Condition Monitoring ◽  
High Voltage ◽  
Partial Discharge ◽  
Essential Elements ◽  
Differential Method ◽  
Partial Discharges ◽  
Discharge Characteristics ◽  
Reliability Indicators ◽  
Instrument Transformer ◽  
Inductive Sensors

Power facilities are now implementing the concept of smart grid and its essential elements – high-voltage digital current and voltage transformers. However, the implementation of digital technologies is slowed down by the lack of operation experience and reliability indicators. One of the main causes of high-voltage equipment failures is insulation damage. The most informative parameters determined by insulation evaluation are partial discharge characteristics. There are rated values of these characteristics for rotating electrical machines and power transformers measured by external equipment. But the existing method of partial discharge analysis cannot be applied to digital current and voltage transformers as there are no criteria for tripping of the innovative equipment with comprehensive insulation. All this urges us to study the possibility to determine experimentally the characteristics of partial discharges in the insulation of digital current and voltage transformers by using embedded inductive sensors in order to develop a method for condition monitoring of digital current and voltage transformers and improving of their reliability. In this work, we have used a model of digital current and voltage transformers, a high-voltage test unit, a digital multi-input oscciloscope and inductive sensors. The experiment includes: detecting partial discharges in the model of digital current and voltage transformers by the external bridge connection, recording the voltage at which partial discharges occur in the simulated fault area, measuring the corresponding value of the apparent charge of the partial discharge, detecting partial discharges in the model of digital current and voltage transformers by a differential method with the help of embedded inductive sensors. The characteristics of partial discharges in the simulated fault area have been experimentally determined on a model of digital current and voltage transformers. The pulse voltage on the embedded inductive sensor corresponding to the apparent charge of 80 pC was equal to 600 mV at the test voltage of 2,7 kV. Embedded inductive sensors allow implementing the method of insulation condition monitoring for digital current and voltage transformers in accordance with the partial discharge characteristics both at the stages of production and operation extending the potential of the electronic (microprocessor) module and increasing the reliability of digital current and voltage transformers.

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.

Effect of Humidity on Partial Discharge Characteristics of Epoxy/Boron Nitride Nanocomposite under High Voltage Stress

2017 ◽  
Vol 7 (3) ◽  
pp. 1562
Author(s):  
Noor ‘Aliaa Awang ◽  
Faris Akmal Suhaini ◽  
Yanuar Z. Arief ◽  
Mohd Hafizi Ahmad ◽  
Noor Azlinda Ahmad ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Boron Nitride ◽  
High Voltage ◽  
Surface Resistance ◽  
Ageing Time ◽  
Partial Discharge ◽  
Discharge Characteristics ◽  
Insulating Materials ◽  
Voltage Stress ◽  
Insulating Properties

Partial discharge (PD) may lead to the degradation of insulating materials and affect the lifetime of high voltage equipment. This paper describes the effect of relative humidity on PD characteristic of epoxy/boron nitride (BN) nanocomposite under high voltage (HV) stress. In this work, CIGRE Method II was utilized as an electrode configuration. BN nanofiller was chosen because of its high insulating properties with high thermal conductivity. The PD characteristics such as PD charge magnitude, PD number or occurrence, and average of PD charge during certain of ageing time under HV stress against relative humidity were examined. The results revealed that PD number of humid samples is higher about 8~14% compared to the normal ones. It is considered due to the decrease of surface resistance of the humid samples. The PD charge magnitudes of humid samples are slightly higher compared to the normal ones. The epoxy/BN nanocomposite has lesser PD number and magnitude compared to the neat epoxy samples.

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