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B. Nageshwar Rao ¹, R. Arunjothi ¹, A. R. Srinivasan ¹, P. Rajashekhar ¹, A. Sudhindra ¹

Affiliations
1 Central Power Research Institute, Bengaluru, IN

Abstract

This paper presents and discusses heat release measurement, smoke and toxicity data obtained on cables: power, communication, automobile, wires and other materials used for various applications in power plants, petroleum refineries, metro rail, automobile industries. Fire survival cables intended to maintain electrical integrity under flaming conditions and flame retardant low smoke cables have been evaluated and their performance discussed. Fire safety assessment methods of cables and materials are reviewed and heat release rate, smoke, toxicity data and flammability characteristics obtained on materials like polystyrene, cellulosic fibre materials, upholstery, FRP/GRP laminate and others are discussed. Cushioning materials like polyurethane foam (slab stack, rigid PU, Expandable Graphite foam), thermally densified polyester block have been evaluated for HRR, smoke properties and the results are discussed. The toxicity of these materials evaluated as per NES 713/NCD 1409 are summarised.

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S. Ganga ¹, N. Vasudev ¹, V. Asai Thambi ¹, R. S. Shivakumara Aradhya ¹, A. Sudhindra ¹

Affiliations
1 Central Power Research Institute, Bangalore-560080, IN

Abstract

This paper presents experimental results obtained on tracking and erosion resistance of Silicone rubber (SIR) with and without pollutants. The IEC-60587 Inclined Plane Tracking and Erosion Test method combined with UV radiations of different intensities was employed to assess two different formulations with same base polymeric material (SIR). The hydrophobicity recovery property of silicone rubber formulations before and after inclined plane tracking test was studied besides the effect of corona. Some of the physical, thermal and electrical properties were compared before and after inclined plane tracking test. It is inferred from the analysis carried out on the experimental results that the intensity of UV radiation plays a major role in deteriorating the surface characteristics of the material. It is also found that the introduction of UV in the test method has helped in distinctly evaluating polymeric materials. The effect of two different pollutants was not the same on formulations considered for the study, which implies that the additives play a dominant role in the overall performance of the material than the base polymer. The study also revealed that a formulation with a better performance under a certain pollutant need not have to behave the same way under a different pollutant. Presently, CIGRE Working Group (WG D1.14) is active in standardization of material aspects besides developing suitable methodology for the testing of polymeric materials for outdoor insulation application; the inferences appear to be an useful input to both CIGRE working group and International Electro technical Committee (IEC TC 15 PT 2).

Keywords

Inclined plane tracking IEC 60587, UV radiation, Silicone rubber, Pollutant

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B. Nageshwar Rao ¹, K. Mallikarjunappa ¹, J. Sundara Rajan ¹, B. Ramachandra ², A. Sudhindra ¹

Affiliations
1 Central Power Research Institute, Bangalore, IN
2 PES College of Engineering, Mandya, IN

Abstract

This paper reviews the main ageing and failure mechanisms of stator winding and methods for extending the useful life of the machine. The symptoms for each failure mechanism are discussed and an overview of various electrical diagnostic techniques for condition assessment of stator winding insulation is presented

Keywords

Stator Winding Insulation, Degradation, Condition Monitoring Techniques.

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B. Nageshwar Rao ¹, K. Mallikarjunappa ¹, C. D. Keri ¹, T. R. Afzal Ahamed ¹, A. Sudhindra ¹, B. Ramachandra ²

Affiliations
1 Central Power Research Institute, Bangalore, IN
2 PES College of Engineering, Mandya, IN

Abstract

This paper presents the test results and analysis made on several machines at site. Case studies are employed to illustrate the usefulness of measurements on the stator windings in service.

Keywords

No Keywords.

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