Evaluasi Degradasi Isolasi Motor akibat Multi-factor Aging berdasarkan Indeks Polarisasi dan SEM-EDX

  • Mochammad Wahyudi Universitas Gadjah Mada
  • Dimas Anton Asfani Institut Teknologi Sepuluh Nopember
  • I Made Yulistya Negara Institut Teknologi Sepuluh Nopember
  • Daniar Fahmi Institut Teknologi Sepuluh Nopember
  • I Gusti Ngurah Satriyadi Hernanda Institut Teknologi Sepuluh Nopember
Keywords: Indeks polarisasi (PI), degradasi isolasi motor, SEM-EDX, tahanan isolasi (IR), XRD

Abstract

The operation of induction motor affected by stress factor causes insulation degradation. This degradation can be observed from changes in insulation characteristics, including electrical, physical, and chemical. This study aimed to evaluate the insulation resistance (IR) and polarization index (PI) since the induction motor condition was good until burned out. Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy ( SEM-EDX) testing was also carried out to analyze changes in microstructure, morphological characteristics, and chemical composition in stator windings. In addition, X-ray powder diffraction ( XRD) testing was presented to validate that the damaged insulation was caused by the given stress. To accelerate degradation of insulation, induction motor in service condition was subjected by a lot of pressure simultaneously, including thermal, moisture, and salt contamination. The accelerated aging testing was gradually conducted according to three schemes with different pressure levels. The results showed that the applied stresses could accelerate the insulation aging. A significant decrease of IR and PI values was found in the third scheme, as the IR value was less than 5 MΩ and the PI value was 0.6 (danger category). The insulation failure was achieved at a total duration of testing for 222 hours. The results of SEM-EDX and XRD testing showed the presence of mineral deposits from water vapor, salt contaminants, cracks, and fracture on the insulation surface.

References

Motor Reliability Working Group, “Report of Large Motor Reliability Survey of Industrial and Commercial Installations, part I,” IEEE Trans. Ind. Appl., Vol. IA-21, No. 4, hal. 853-864, Juli/Agt. 1985.

G.C. Stone, E.A. Boulter, I. Culbert, dan H. Dhirani, Electrical Insulation for Rotating Machines: Design, Evaluation, Aging, Testing and Repair, New York, USA: Wiley- IEEE Press, 2004.

J.H. Dymond, N. Stranges, K. Younsi, dan J.E. Hayward, “Stator Winding Failures: Contamination, Surface Discharge, Tracking,” IEEE Transactions on Industry Applications, Vol. 38, No. 2, Mar./Apr. 2002.

IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery, IEEE Std. 43-2013, 2013.

R.M. Tallam, S.-B. Lee, G. Stone, G.B. Kliman, J. Yoo, T.G. Habetler, dan R.G. Harley, “A Survey of Methods for Detection of Stator Related Faults in Induction Machines,” 4th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives, (SDEMPED 2003), 2003, hal. 35-46.

S.B. Lee, J. Yang, K. Younsi, dan R.M. Bharadwaj, “An Online Groundwall and Phase-to-Phase Insulation Quality Assessment Technique for Ac-Machine Stator Windings,” IEEE Transactions on Industry Applications, Vol. 42, No. 4, Jul./Agt. 2006.

Insulation Resistance Testing, Fluke Corperation, 2007.

M. Farahani, E. Gockenbach, H. Borsi, dan M. Kaufhold, “Behaviour of a Machine Insulation System During Accelerated Aging Tests,” IEEE International Symposium on Electrical Insulation, 2008, hal. 404-407.

D.L. McKinnon, “Insulation Resistance Profile (IRP) and Its Use for Assessing Insulation Systems,” IEEE International Symposium on Electrical Insulation, 2010, hal. 1-4.

A. Brown, M. Essalihi, dan E. David, “Insulation Resistance Measurements for Machine Insulation,” Electrical Insulation Conference, 2011, hal. 261-264.

H. Torkaman dan F. Karimi, “Measurement Variations of Insulation Resistance/Polarization Index During Utilizing Time in HV Electrical Machines – A Survey” Measurement, Vol. 59, hal. 21–29, 2015.

I.M.Y. Negara, D.A. Asfani, D. Fahmi, S.S. Aisyah N., “Testing and Simulation of Motor Insulation System Under Some Artificial Environmental Conditions,” Proc. of Int. Conf. on Electrical Engineering, Computer Science, and Informatics (EECSI), 2014, hal. 286-289.

A.S. Guedesa, S.M. Silvaa, B.d.J.C. Filhoa, dan C.A. Conceic¸ “Evaluation of Electrical Insulation in Three-Phase Induction Motors and Classification of Failures Using Neural Networks,” Electric Power Systems Research, Vol. 140, hal. 263–273, 2016.

N. Phloymuk dan N. Tanthanuch, “Improvement of Insulation for Rotating Machine by Dry Ice Method,” International Electrical Engineering Congress (iEECON), 2016, hal. 345-348.

N. Lahoud, J. Faucher, D. Malec, dan P. Maussion, “Electrical Aging of the Insulation of Low-Voltage Machines: Model Definition and Test with the Design of Experiments,” IEEE Transactions on Industrial Electronics, Vol. 60, No. 9, hal. 4147-4155, 2013.

M. Yamamoto dan K. Ohashi, “Salt Contamination of External of High Voltage Apparatus and Its Countermeasurs”, Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems, Vol. 80, No. 3, hal. 380-387, 1961.

Published
2019-02-08
How to Cite
Mochammad Wahyudi, Dimas Anton Asfani, I Made Yulistya Negara, Daniar Fahmi, & I Gusti Ngurah Satriyadi Hernanda. (2019). Evaluasi Degradasi Isolasi Motor akibat Multi-factor Aging berdasarkan Indeks Polarisasi dan SEM-EDX. Jurnal Nasional Teknik Elektro Dan Teknologi Informasi, 8(1), 92-100. Retrieved from https://dev.journal.ugm.ac.id/v3/JNTETI/article/view/2621
Issue
Vol 8 No 1: February 2019
Section
Articles

© Jurnal Nasional Teknik Elektro dan Teknologi Informasi, under the terms of the Creative Commons Attribution-ShareAlike 4.0 International License.