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Reliability improvement of fork biasing spring in MCCB mechanism

Author

Listed:
  • Ajinkya Shirurkar

    (Vellore Institute of Technology Chennai Campus
    L&T EAIC)

  • Yogesh Patil

    (L&T EAIC)

  • D. Davidson Jebaseelan

    (Vellore Institute of Technology Chennai Campus)

Abstract

Trips are used in moulded case circuit breaker (MCCB) to provide protection to low voltage distribution systems. Trip free can be achieved by using the fork biasing spring, that helps the fork to gets back to its intended trip position after the breaker gets tripped and helps avoiding intermediate position. Mechanical endurance testing of MCCBs mechanism for trip operation showed that fork biasing spring fails before the desired number of trip operation. In this study an improved design for fork biasing spring is proposed in order to increase the reliability of fork biasing spring. The springs are assembled in the MCCB mechanism and are subject to mechanical endurance test for trip operation. The results obtained from mechanical endurance test are used to determine the reliability of the springs using Weibull, Normal, Exponential, Lognormal, 3 Parameter Weibull, 3 Parameter Lognormal, 2 Parameter Exponential and 3 Parameter Loglogistic distribution for life data plots. The cause of the failure in present fork biasing spring is due to hook breakage in extension springs and the recommended torsion spring increases reliability.

Suggested Citation

  • Ajinkya Shirurkar & Yogesh Patil & D. Davidson Jebaseelan, 2019. "Reliability improvement of fork biasing spring in MCCB mechanism," International Journal of System Assurance Engineering and Management, Springer;The Society for Reliability, Engineering Quality and Operations Management (SREQOM),India, and Division of Operation and Maintenance, Lulea University of Technology, Sweden, vol. 10(4), pages 491-498, August.
    • Handle: RePEc:spr:ijsaem:v:10:y:2019:i:4:d:10.1007_s13198-018-0732-y
    DOI: 10.1007/s13198-018-0732-y
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    References listed on IDEAS

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    1. Santosh B. Rane & Yahya A. M. Narvel, 2016. "Reliability assessment and improvement of air circuit breaker (ACB) mechanism by identifying and eliminating the root causes," International Journal of System Assurance Engineering and Management, Springer;The Society for Reliability, Engineering Quality and Operations Management (SREQOM),India, and Division of Operation and Maintenance, Lulea University of Technology, Sweden, vol. 7(1), pages 305-321, December.
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    6. Kim, Jin Seon & Yum, Bong-Jin, 2008. "Selection between Weibull and lognormal distributions: A comparative simulation study," Computational Statistics & Data Analysis, Elsevier, vol. 53(2), pages 477-485, December.
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    Cited by:

    1. Sainath G. Bidikar & Santosh B. Rane & Prathamesh R. Potdar, 2022. "Product development using Design for Six Sigma approach: case study in switchgear industry," International Journal of System Assurance Engineering and Management, Springer;The Society for Reliability, Engineering Quality and Operations Management (SREQOM),India, and Division of Operation and Maintenance, Lulea University of Technology, Sweden, vol. 13(1), pages 203-230, February.

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