Browse > Article
http://dx.doi.org/10.5370/JEET.2006.1.1.114

Leakage Current Waveforms of Outdoor Polymeric Insulators and Possibility of Application for Diagnostics of Insulator Conditions  

Suwarno Suwarno (Dept. of Electrical Engineering, Bandung Institute of Technology)
Publication Information
Journal of Electrical Engineering and Technology / v.1, no.1, 2006 , pp. 114-119 More about this Journal
Abstract
This paper reports the investigation results on the leakage currents (LC) on polymeric outdoor insulators. The samples used were EPDM (ethylene prophylene diene monomer) insulators used at 20 kV distribution lines. AC voltage was applied and the LC waveforms were measured under various environmental conditions (humidity and pollution). Digital data of the LC was transferred from a digital storage oscilloscope to a computer for further analysis. The LC waveform parameters such as magnitude and harmonic content (as indicated by the total harmonic distortion (THD)) were analyzed. The experimental results showed that 3rd, 5th and 7th harmonics and higher odd harmonics were observed for symmetrical-distorted LC waveforms while for unsymmetrical-distorted LC waveforms, odd and even harmonics were observed. The LC analysis indicated that there are 5 stages of insulator conditions from normal condition up to flashover correlated with different kind of LC waveforms. The results also showed that in general the magnitude of LC was good enough to show the condition of the insulators. However, under discharge condition (for example as a result of dry band arching) the LC magnitude should be combined by the THD to show a better correlation with the insulator condition. The product between THD and LC magnitude may be used as a diagnostic parameter.
Keywords
Leakage current; Outdoor insulator; THD; Diagnosis;
Citations & Related Records
연도 인용수 순위
  • Reference
1 F. Amarch, G. Karady, R. Sundararajan, 'Level Crossing Analysis of Leakage Current Envelope of Polluted Insulators', IEEE Power Engineering Review, pp. 46-49, August 2001
2 A. Vlastos, T. Orbeck, 'Outdoor Leakage Current Monitoring of Silicone Composite Insulators in Coastal Service Conditions', IEEE Trans., Power Delivery, Vol. 11, No.2, pp. 1066-1070, Apr. 1996   DOI   ScienceOn
3 Wong, K.L., 'Study of Acoustic Emission (AE) caused by High Voltage Insulators', ICMEP ACEID, Chongqing, China, pp. 272-274, Nov. 2003
4 Haddad, J. Crespo, AR Rowland, H. Griffiths, DI Williams, 'Techniques for Monitoring Outdoor Polymeric Insulators', ICMEP-ACEID, Chongqing, China, pp. 322-326, Nov. 2003
5 Suwarno, 'Study on the waveform of Leakage Current on Outdoor Polymeric Insulators', Proc. 2002 Joint Conf. ACED & K-J Symp. On HV, Seoul, Korea, pp. 398-401, Nov. 2002
6 J Zhidong, G. Haifeng, G. Zhicheng, 'Leakage Current and Flash over of Field-aged RTV coated Insulator', 2002 Joint Conf ACED _K-J Sym, Seoul, Nov. 2002
7 AH EI Hag, S.H. Jayaram, E.A. Cherney, Fundamental and low Freq. components of LC as a diagnostic Tool to Study Aging of RTV and HTV SIR in Salt-Fog, IEEE Trans. on Dielectrics and Electrical Insulation, Vol. 10, No. I, 2003, pp. 128136, Feb. 2003   DOI   ScienceOn
8 Jeong Ho Kim, Woo Chang Song, Jae Hyung Lee, Yong Kwan Park, Han Goo Cho, Yeong Sik Yoo, Kea Joon Yang, 'Leakage Current Monitoring and Outdoor Degradation of SIR', IEEE Trans. on Dielectrics and Electrical Insulation, Vol. 8 No. 6, pp. 1108-1115, Dec. 2001   DOI   ScienceOn
9 T. Suda, 'Frequency Characteristics of Leakage Current Waveforms of a String of Suspension Insulators', IEEE Trans., Power Delivery, Vol. 20, No. 1, pp. 481-487, Jan. 2005   DOI   ScienceOn
10 Fernando, M.A.R.M., and Gubanski, S. M., 'Leakage Currents on Non-ceramic Insulators and Materials', IEEE Trans. on Dielectrics and Electrical Insulation ,Vol. 6, No. 5, pp. 660-667, Oct. 1999   DOI   ScienceOn