Accelerated-ageing test for RTV-coated insulators: analysis of electrical and material properties

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Accelerated-ageing test for RTV-coated insulators: analysis of electrical and material properties

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An accelerated-ageing test is conducted on three room-temperature-vulcanised (RTV) coated porcelain insulators, until the initiation of ageing phenomena, in a salt-fog-ageing test chamber. The test conducted was similar to the IEC 1109 1000 h test, but with scaled-down test set-up parameters to address criticisms published in the literature. The results obtained prove the effectiveness of the hydrophobicity of the surface in terms of electrical and material properties. The electrical properties were obtained by online monitoring of the leakage current. The material characteristics were evaluated by conducting energy-dispersion X-ray (EDX) analysis and X-ray-diffraction (XRD) analysis. In addition, the fog dynamics in the test chamber on the direct fog (DF) sample, which is in the axis of nozzle columns, and indirect fog samples IF1 and IF2, which were slightly away from the nozzle column axis, was evaluated. It was concluded that the RTV-coated samples which were kept away from the nozzle-column axis, i.e. IF1 and IF2 samples, showed symptoms of initiation of ageing earlier than the sample which was in direct fog mode.

Inspec keywords: leakage currents; nozzles; insulator testing; ageing; life testing; materials properties; vulcanisation; X-ray chemical analysis; X-ray diffraction; IEC standards; materials testing; porcelain insulators

Other keywords: accelerated-ageing test; fog dynamics; salt-fog-ageing test; material property analysis; X-ray diffraction; leakage current; electrical property analysis; IEC 1109 1000; nozzle columns; room temperature vulcanizing; EDX; RTV coated insulators; online monitoring; porcelain insulators; XRD; energy-dispersion; X-ray chemical analysis

Subjects: Power line supports, insulators and connectors

References

    1. 1)
      • R.S. Gorur , G.G. Karady , A. Jagota , M. Shah , A.M. Yates . Ageing in silicone rubber used for outdoor insulation. IEEE Trans. , 525 - 538
    2. 2)
      • W.T. Starr . Polymeric outdoor insulation. IEEE Tans. , 125 - 136
    3. 3)
      • S.H. Kim , E.A. Cherney , R. Hackam . Effects of filler level in RTV silicone rubber coatings used in HV insulators. IEEE Trans. , 6 , 1065 - 1072
    4. 4)
      • Swift, D.A.: `AC flashover mechanism of water droplets on an hydrophobic insulator', 44.09, 8thInt. Symp. HV Engineering (ISH), 1993, Tokyo, p. 1–4.
    5. 5)
      • Gorur, R.S., Bernstein, B.S., Champion, T., Hervig, H.C., Orbeck, T.: `Evaluation of polymeric materials for HV outdoor insulation', CIGRÉ paper 15-107, 1994.
    6. 6)
      • Jim Hall, and Orbeck, T.: ‘RTV protective coating for porcelain insulators’, IEEE 82, SM 363-0.
    7. 7)
      • Gutman, I., Hartings, R., Matsuoka, R., Kondo, K.: `Experience with IEC 1109, 1000h salt-fog test: Experience and suggestions for improvements', Nordic Insulation Symp., June 1996, p. 389–398.
    8. 8)
      • R. Hackam . Outdoor HV composite polymeric insulators. IEEE Trans. , 5 , 557 - 585
    9. 9)
      • `Composite insulators for AC overhead lines with a nominal voltage greater than 1000 V—Definitions, test methods and acceptance criterion', 1109:1992-03, 1992, IEEE.
    10. 10)
      • I. Gutman , R. Hartings , R. Matsuoka , K. Kondo . Experience with IEC 1109, 1000h salt-fog ageing test for composite insulators. IEEE Elect. Insul. Mag. , 3 , 36 - 39
    11. 11)
      • S.H. Kim , E.A. Cherney , R. Hackam . Hydrophobic behaviour of insulators coated with RTV silicone rubber. IEEE Trans. , 610 - 622
    12. 12)
      • G.S. Gorur , J. Chang , O.G. Amburgey . Surface hydrophobicity of polymers used for outdoor insulation. IEEE Trans.
    13. 13)
      • `Basic environmental testing procedures. Part 2. Tests Ka. Salt mist', 68-2-11:1981:, 1981, IEC.
    14. 14)
      • H. Deng , R. Hackam , E.A. Cherney . Role of the size of the particles of alumina tri-hydrate filler on the life of RTV silicone rubber coating. IEEE Trans. , 1012 - 1024
    15. 15)
      • IEEE Dielectrics and Electrical Insulation Society Outdoor Service Environment Committee S-32-3 report: ‘Protective coatings for improving contamination performance of outdoor high voltage ceramic insulators’, IEEE Trans., 1995, PD-10, pp. 924–933.
    16. 16)
      • `American National Standard for composite suspension insulators for overhead transmission lines tests', 29.11:1989, 1989, American National Standards Institute.
    17. 17)
      • `Artificial pollution tests on high–voltage insulators to be used on AC systems', 507:1991, 1991, IEC.
    18. 18)
      • J. Pilling , R. Barsch . Accelerated ageing tests of housing materials for composite insulators in a fog–chamber. ETEP. , 89 - 94
    19. 19)
      • S.H. Kim , R. Hackam . Effects of saline water flow rate and air speed on leakage current in RTV coatings. IEEE Trans. , 1956 - 1964
    20. 20)
      • Gutman, I., Hartings, R., Riquel, G.: ‘IEC 5000 hours ageing test: Critical review and further test development’. Proc. Int. Symp. Electric Power Engineering, Sweden, 1995, Vol. High Voltage Technology, pp. 310–315.
    21. 21)
      • `IEEE Application guide for evaluating non-ceramic materials for HV outdoor applications', 1133:1988:, 1988, IEEE.
    22. 22)
      • H.M. Schneider , A.E. Lux . Mechanism of HVDC wall bushing flashover. IEEE Trans.
    23. 23)
      • Spellman, C.A., Young, H.M., Haddad, A., Rowlands, A.R., Waters, R.T.: `Survey of polymeric insulator ageing factors', 4.160 PI, 11thInt. Symp. HV Engineering (ISH), 1999, London, p. 1–4.
    24. 24)
      • Devendranath, D., Channakeshava, , Mohan Rao, N.S., Rajkumar, A.D.: `Sensitivity studies on leakage current in RTV coated insulator under salt–fog pollution tests', CIGRÉ Colloquium, 1999, Lucerne, Switzerland, SC 33 (COLL) IWD.
    25. 25)
      • Devendranath, D., Channakeshava, , Rajkumar, A.D.: `Scale down test parameters of IEC 507, 1991 for pollution ageing studies on RTV coated insulator', 12thInt. Symp. High Voltage Engineering, 2001, Bangalore, India, p. 671–674.
    26. 26)
      • D. Devendranath , Channakeshava , A.D. Rajkumar . Leakage current and charge in RTV coated insulators under pollution conditions. IEEE Trans. , 294 - 299
    27. 27)
      • D. Devendranath , G. Girija , R.S. Shivkumara Aradhya , B. Gunasekaran , A. Bhaskaran . Development and application of a multi channel current integrator-cum-peak classifier for on-line monitoring of leakage current on RTV coated insulators. IEE Proc.- Gener. Trans. Distrib , 247 - 252
    28. 28)
      • R.S. Gorur . Developing an accelerated ageing test for composite polymer insulators: Challenges and a possible approach. Insul. News Mark. Rep. , 6 , 54 - 59
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