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Flashover Characteristics Performance Assessment under Contamination Possessions on the Surface of Porcelain Insulators

Rahul Soni, Mihir Bhatt

KEYWORDS

Porcelain Insulators, Dust, NaCl, Moisture, Contamination, Flashover, Breakdown Voltage

PUBLISHED DATE June, 2018
PUBLISHER The Author(s) 2018. This article is published with open access at www.chitkara.edu.in/publications
ABSTRACT

This paper presents the experimental outcomes regard to the flashover performance of pin, shackle and disc insulators under contaminated conditions. For making contaminated surface various samples are made like salt, dust, industry pollution and miscellaneous foreign particles of wet and dry conditions as per IEC testing techniques. Moreover, each insulator has been tested under above mentioned conditions. For each insulator its breakdown voltages were measured. After doing performance analysis of different insulators under contaminated condition measurement of breakdown voltages are done with incorporation of real field application of insulators and making analogy with various regions of India.

INTRODUCTION

Due to the demand of electric power is substantially improved in recent days. Each and every electrical equipment must be designed, commissioned and tested for critical situations. To keep the system healthy and sound from transmission to distribution to consumer end continuous monitoring is required. For longer transmission system different insulators are used with different materials like porcelain, ceramic, glass.The performance of insulator under different contaminations was also studied [1]. As per the research it has been evaluated that various parts of country is having various pollutants that deposit on the surface of insulators [2]. Porcelain, ceramic, polymeric types insulators are also affected by NaCL and other foreign particles deposition and just due to that various flashover mechanisms have been observed under wet and dry conditions [3]. The insulators commence to fail due to mixture of air particles, water dew drops, salt and fog conditions under behavior of environmental parameters [4]. If proper cleanliness is not maintained this pollutants try to degrades the quality of insulator and gradually life cycle of insulators [5]. Due to pollutants various treeing and tracking process is elongated throughout the surface of insulators and small sparks will be continued to make flashover on the specimen [6]. An experimental procedure helps to identify flashover characteristic because of contamination influence and degradation of heath index of insulation surface as well as on a longer run its properties [7-8]. Performance of insulator varies according to various environmental factors [9]. Not only the insulators that are used in transmission lines but also insulators used in traction applications are similarly affected by environmental parameters like wind, humidity etc. [10]. Polymeric type insulators were also commissioned and tested in japan and performance of insulators in terms of leakage currents were measured [11]. Due to failure of mixing with water it is having small values of currents and now due to aid of contamination high value of currents are measured [12]. Simple construction shows leakage current and breakdown voltage on the other hand complex construction depends upon various parameters like dimensions and design [13-14]. Outdoor insulators prone to external interventions and based on that its reliability is drastically reduced [15]. Such contamination effects are not severe in terms of residential areas unlikely hilly and farming regions [16].

At present days due to prompt demand of power supply more industries are progressed to reach that power demand and those zones are affected harshly by several contaminations. When this dust and other pollutant mixed with other wet and dry contaminant particles, as these pollutants are having contrary effects on life cycle of insulators and moreover it reduces the dielectric properties of insulators in many regions of India like many states nearby coastal areas. The left over part of the paper is prepared as follows: Breakdown Mechanism, Experimental Details, Results and Discussions and Conclusion.

Page(s) 47-56
URL http://dspace.chitkara.edu.in/jspui/handle/123456789/781
ISSN Print : 2321-3906, Online : 2321-7146
DOI 10.15415/jotitt.2018.61005
CONCLUSION

The investigation result shows that breakdown voltages, performance and life cycles drastically affected by the dust particles, NaCl Contamination deposition as well as some miscellaneous manufacturing industries polluted substances like lime stone, cement particles and other pollutants.

  • For fair and proper design of outdoor insulation accurate knowledge of pollutant locations take into the consideration so it’s very important to carry out proper site investigation for incorporating of such insulators.
  • By doing rigorous analysis of different physical and chemical contamination layers on surface of insulators we can check the flashover performance of insulators.
  • Soluble contamination such as NaCl particle is having significant effect on flashover voltage.
  • Insoluble contamination such as cement and other particle are not having significant effect but they aid the impediment of ionic movement.
  • For multi contaminant deposition or mixed polluted condition anions and cations are having again significant effect on insulators and eventually all these pollutants decrease the life cycle of insulators.
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