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Assessment of 23 kV Capacitive Coupler for On-line Partial Discharge Measurements
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 Title & Authors
Assessment of 23 kV Capacitive Coupler for On-line Partial Discharge Measurements
Jeong, J.Y.; Kang, D.S.; Sun, J.H.; Heo, J.C.; Park, C.H.;
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 Abstract
The partial discharge (PD) measurement is a very effective method to assess the winding insulation condition of high-voltage machines, since most of the insulation failure processes are directly or indirectly caused by PD. On-line PD measurements, which can detect insulation defects of winding in the early stages on rotating machines in operation, have been accepted as the most important technique. The epoxy mica capacitive coupler is currently and extensively used for on-line detection of PD pulses of high-voltage rotating machines. To evaluate the feasibility of developing a capacitive coupler that is easier to manufacture at a lower cost compared to epoxy mica couplers, a 100pF capacitive coupler made of ceramic material is designed, fabricated and tested for on-line PD measurements of 23 kV electrical machines. A series of electrical tests and accelerated aging tests are performed on the ceramic coupler to evaluate the performance requirements, long-term reliability and thermal stability for in field application. The test results show that the newly developed ceramic coupler provides equal and improved performance at a lower cost compared to epoxy mica couplers, and estimated voltage life is anticipated to surpass 100 years.
 Keywords
Electric machine;Partial discharge;On-line monitoring;Ceramic coupler;
 Language
English
 Cited by
1.
센서용 세라믹 소체의 전기적 수명지수 산출,정주영;강동식;선종호;허종철;추영배;박정후;

전기학회논문지, 2009. vol.58. 10, pp.1995-1999
2.
Positioning of Partial Discharge Origin by Acoustic Signal Detection in Insulation Oil,;;;;

Journal of International Council on Electrical Engineering, 2012. vol.2. 1, pp.28-32 crossref(new window)
3.
Considerations on the Long-term Reliability of On-line Partial Discharge Ceramic Sensor for Thermal Power Generators and its Demonstration in the Field,;;;;

Journal of Electrical Engineering and Technology, 2012. vol.7. 1, pp.103-108 crossref(new window)
4.
Characteristic Analysis and Origin Positioning of Acoustic Signals Produced by Partial Discharges in Insulation Oil,;;;;

Journal of Electrical Engineering and Technology, 2013. vol.8. 6, pp.1468-1473 crossref(new window)
5.
Partial Discharge Pattern Recognition of Cast Resin Current Transformers Using Radial Basis Function Neural Network,;

Journal of Electrical Engineering and Technology, 2014. vol.9. 1, pp.293-300 crossref(new window)
1.
Characteristic Analysis and Origin Positioning of Acoustic Signals Produced by Partial Discharges in Insulation Oil, Journal of Electrical Engineering and Technology, 2013, 8, 6, 1468  crossref(new windwow)
2.
Considerations on the Long-term Reliability of On-line Partial Discharge Ceramic Sensor for Thermal Power Generators and its Demonstration in the Field, Journal of Electrical Engineering and Technology, 2012, 7, 1, 103  crossref(new windwow)
3.
Positioning of Partial Discharge Origin by Acoustic Signal Detection in Insulation Oil, Journal of International Council on Electrical Engineering, 2012, 2, 1, 28  crossref(new windwow)
4.
Partial Discharge Pattern Recognition of Cast Resin Current Transformers Using Radial Basis Function Neural Network, Journal of Electrical Engineering and Technology, 2014, 9, 1, 293  crossref(new windwow)
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