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Development of mechanism for mounting secondary isolating contacts (SICs) in air circuit breakers (ACBs) with high operational reliability

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Abstract

The main function of Secondary Isolating Contacts (SICs) is to provide power supply to accessories in Air Circuit Breaker (ACB). A new SIC identified, had more number of contacts in a very compact design. There was a need for developing a mechanism to mount these SICs by having a key focus on compactness, alignment and tolerance in ACBs along with high probability of survival for the defined period and operation, to ensure repeated and prolonged use without failure in performance. After the development of mechanism, lifetime distributions were used to assess the reliability of the mechanism, based on the results obtained from operating reliability of the mechanism, modifications were done to improve the reliability. After subsequent developments and modifications in design, reliability of the mechanism increased from 14 to 88% in phase I to phase III respectively. The new arrangement can save up to 25% of the cost compared to current designs. Companies using such SICs can become more competitive, and pass on the cost savings benefits to end users. The volume of SIC and weight of plastic were reduced by approximately 66 and 70%, respectively. The amount of non-degradable waste entering the environment will be considerably reduced.

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Acknowledgments

This research paper was made possible through the resources and help provided by two great organizations, namely Sardar Patel College of Engineering and Larsen & Toubro Switchgear Ltd.

We sincerely wish to acknowledge a deep sense of gratitude for the valuable guidance, suggestions and generous help extended by Satyaprakash Sharma. In addition, we would like to thank S.S. Ahluwalia for his great help and co-operation. We are also very thankful to Abdul Aziz Gazdar who actually read our paper at micro level and gave us many valuable suggestions.

We sincerely thank all the authors who made available sufficient literature in this domain that helped us and kept us in the right direction.

The product of this research paper would not have been possible without all of them.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Sardar Patel College of Engineering Munshi Nagar, Andheri West, Mumbai, 400058, Maharashtra, India

    Santosh B. Rane

  2. Department of Mechanical Engineering, Sardar Patel College of Engineering, Munshi Nagar, Andheri West, Mumbai, 400058, Maharashtra, India

    Yahya A.M. Narvel

  3. Switchgear Design and Development Centre, Larsen & Toubro Limited, ABEB, Gate No. 5, Powai Campus (E), Saki Vihar Road Mumbai, Mumbai, 400072, India

    Niloy Khatua

Authors
  1. Santosh B. Rane
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  2. Yahya A.M. Narvel
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  3. Niloy Khatua
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Correspondence to Yahya A.M. Narvel.

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Rane, S.B., Narvel, Y.A. & Khatua, N. Development of mechanism for mounting secondary isolating contacts (SICs) in air circuit breakers (ACBs) with high operational reliability. Int J Syst Assur Eng Manag 8 (Suppl 2), 1816–1831 (2017). https://doi.org/10.1007/s13198-017-0678-5

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  • DOI: https://doi.org/10.1007/s13198-017-0678-5

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