Diagnostic of generator partial discharge and acoustic imaging scheme for monitoring winding health condition and repair

Riyo Purnomo, Triyadi Nugraha Syaputra, Rian Suryadiningrat

Abstract


Partial discharge in a generator is a phenomenon of electrical discharge that occurs in the generator winding insulation. This phenomenon, if it continues, will cause the generator winding insulation failure. Therefore, partial discharge needs to be monitored, both on-line and off-line. Currently, partial discharge monitoring equipment has been installed at the Cirata Hydroelectric Power Plant (PLTA Cirata), and routine off-line partial discharge testing has been carried out. With this data, it can be used as a reference for the necessary generator maintenance. If the partial discharge trending value increases 2 times in a year, maintenance is required. During maintenance, acoustic imager testing is carried out to map the location of the partial discharge. By combining the three types of testing, a good generator monitoring system will be obtained, and the right type of maintenance will be determined according to the partial discharge mapping results. The analysis begins by conducting on-line and off-line partial discharge trending. If the trending has exceeded the limit, mapping is then carried out with an acoustic imager during maintenance, and repairs are made according to the location and type of damage. Analysis of maintenance results is carried out by comparing the magnitude of the partial discharge value before and after maintenance. The maintenance results based on the test results of the three methods proved effective, this was indicated by a decrease in the off-line PD value from 751.3 nC to 3.792 nC and on-line PD from 23.92 nC to 1.059 nC.


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References


G.C. Stone, I. Culbert, E.A. Boulter, and H. Dhirani, Electrical Insulation for Rotating Machines: Design, Evaluation, Aging, Testing and Repair, 2 nd edition, Wiley-IEEE Press, 2014

Vonroll,”Corona-shield P8003 Conductive Varnish”, Von Roll Switzerland.

IEC 60034-27-2-2012 : On-line Partial Discharge Measurements On the Stator Winding Insulation of Rotating Electrical Machines, IEC standard.

A.U. Albab, A. Ichwan, R. Martua," Condition Monitoring of High Voltage Motors Utilizing Corona Camera to Determine the Precise Location of Insulation Surface Discharge as the Basis for Undertaking the Appropriate Repair",2023 4th International Conference on High Voltage Engineering and Power Systems (ICHVEPS): August 6-10, 2023, Bali, Indonesia, doi: 10.1109/ICHVEPS58902.2023.10257515

G.C. Stone, M.K.W Stranges, and D.G. Dunn,”Recent Developments in IEEE and IEC Standards for Off-line and On-line Partial Discharge Testing of Motor and Generator Stator Windings”, 2014 IEEE Petroleum and Chemical Industry Technical Conference (PCIC): September 8-10, 2014, CA, USA, doi: 10.1109/PCICon.2014.6961921

Y. Wang, X. Li, H. Zhang, D. Wang, and B. Jin,"Partial Discharge Ultrasound Detection Using the Sagnac interferometer System", Sensors, Vol.18, No.5, May. 2018, doi: 10.3390/s18051425

G.C. Stone, M. Sasic, C. Wandel, and A. Saikh,"Initial Experience with Acoustic Imaging of PD on High Voltage Equipment", 2021 IEEE Electric Insulation Conference (EIC): June 7-28, 2021, CO, USA, doi:10.1109/EIC49891.2021.9612346

A.Kang, M. Tian, C. Li, J. Song, S.V. Suraci, W. Li, L. Lin, Z. Lei, and D. Fabiani," Development and pattern identification of end-winding discharge under effect of relative humidity and temperature for HV motors", High Voltage, Vol.5, No.4, pp.434-443, Aug.2020, doi:10.1049/hve.2019.0124

J. Letal, B. Satmoko, N. Manic, and G. Stone, “Stator End-Winding Vibration in Two-Pole Machines Avoiding Generator Failure”, IEEE Industry Application Magazine, Vol.26, No. 6, pp. 29-39, 2020, doi: 10.1109/MIAS.2020.2982725

Vonroll,”Corona-shield P8001 Semiconductive Varnish”, Von Roll Switzerland.

Commissioning report,” Omicron PD monitoring system-operation manual”, Cirata Hydroelectric Power Plant, West Java, Indonesia, 2013.

Omicron, “Introduction and History of PD Measurement”, Omicron academy, June 2012.

Y. Luo, Z. Li, and H. Wang, “ A Review of Online Partial Discharge Measurement of Large Generators “. Energies, Vol. 10, No.11, Oct. 2017, doi: 10.3390/en10111694

IEC 60034-27-2006 : Off-line Partial Discharge Measurements On the Stator Winding Insulation of Rotating Electrical Machines, IEC standard.

Omicron,”MPD 600 User Manual”, Omicron electronics GmbH, 2013

L. Lin, A. Kang, J. Song, Z. Lei, Y. Zhao, and A. Isenberg, “Effect of water vapor on oil-contamination discharge of stator windings”. 2016 IEEE International Conference on Dielectrics (ICD): July 3-7, 2016, Montpellier, France, doi:10.1109/ICD.2016.7547697

H. Janani, and B. Kordi, “Towards automated statistical partial discharge source classification using pattern recognition techniques”, High Voltage, Vol.3, No.3, Sep.2018, doi: 10.1049/hve.2018.5048

Y. Chen, X. Peng, H. Wang, J. Zhou, Y. Zhang, and Z. Liang.” Generator Stator Partial Discharge Pattern Recognition Based on PRPD-Grabcut and DSC-GoogLeNet Deep Learning”, IEEE Transactions on Dielectrics and Electrical Insulation, Vol.30. No.5, pp. 2267-2276, 2023, doi: 10.1109/TDEI.2023.3275548

A. Abubakar, and C. Zachariades, ”Phase-Resolved Partial Discharge (PRPD) Pattern Recognition Using Image Processing Template Matching”, Sensors, Vol. 24, No.11, May.2024, doi: 10.3390/s24113565

Fluke,”ii900/ii910 Acoustic Imager User Manual”, Fluke, April 2019

Omicron,”Monitoring System ARGOS”, Omicron Academy, June 2012.

IEEE Std 1434™-2014, “IEEE Guide for the Measurement of Partial Discharges in AC Electric Machinery”, IEEE.

Omicron,"Cause of PD in Stator Winding and PRPD Pattern Interpretation", Omicron Academy, June 2012.

Z. Yang, M. Chi, X. Zhang, and R. Wang, “Breakdown strength-enhancing study on anti-corona nonlinear material for high-voltage generator stator coils”. Electr Eng. Vol.107, No.2, Jul.2024, doi: 10.1007/s00202-024-02593-4

H. Hu, X. Zhang, Y. Liu, L. Guo, and J. Gao, “ Optimization of the Electric Field Distribution at the End of the Stator in a Large Generator”, Energies, Vol.11 No.10, Sep.2018, doi: 10.3390/en11102510




DOI: https://doi.org/10.12962/jaree.v9i2.466

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