Implications of Direct and Indirect Heating of Bi-Metallic Strip in MCCBs – Challenges and Solutions

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Published Jun 30, 2020
https://doi.org/10.33686/pwj.v16i1.152772
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Volume 16, Issue 1, June 2020

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Sudhakar Sapuram
R&D Department, C&S Electric Ltd, Sector-8, Noida – 201301, Uttar Pradesh
Suresh Srikantaiah
R&D Department, C&S Electric Ltd, Sector-8, Noida – 201301, Uttar Pradesh
Amit Kumar Vishnoi
R&D Department, C&S Electric Ltd, Sector-8, Noida – 201301, Uttar Pradesh
Siraparapu Satyanarayana
R&D Department, C&S Electric Ltd, Sector-8, Noida – 201301, Uttar Pradesh

Abstract

This describes about the main differences between direct and indirect heating of bi-metals for overload protection for MCCBs. It also explains about analysis of thermal behavior of bimetal strip during both steady-state and transient conditions. To validate the thermal model, experimental tests both in steady-state and transient conditions have been done. The time current characteristics curves for both types of MCCB are plotted for meeting relevant product standards and same is validated with actual tripping time. There is a good correlation between experimental and theoretical results. Direct heating of bi-metal element can help in reduction of electrical stresses and also increases the life span of the power cables. It also outlines the challenges overcome during development and solutions for implementation of direct and indirect heating of bi-metal strips for developing the MCCBs for fulfillment of IEC 60947-2 as well as REC specifications.

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How to Cite
Sapuram, S., Srikantaiah, S., Vishnoi, A. K., & Satyanarayana, S. (2020). Implications of Direct and Indirect Heating of Bi-Metallic Strip in MCCBs – Challenges and Solutions. Power Research - A Journal of CPRI, 33–38. https://doi.org/10.33686/pwj.v16i1.152772
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References

  1. DiMarco, et al. Method for thermally calibrating circuit breaker trip mechanism and associated trip mechanism. United States Patent, USA; 2000 Feb.
  2. GHewiston L, Brown M, Ramesh B. Practical power system protection, 1st ed., Elsiver; 2004. p. 153–4.
  3. Plesca AT. Thermal analysis of overload protection relays using finite element method. Indian Journal of Science and Technology. 2013 Aug; 6:5120–5.
  4. Coleman E. Electric circuit breaker. Unites States Patent, USA, Patent No:4, 156, 219; 1979 May 22.
  5. Dodia D, Mawandiya BK, Bhatewara N. Development of overload protection trip unit for higher rating current of MCCB. Journal of Basic and Applied Engineering Research. 2016 Jul–Sep; 3(11):1019–21.
  6. Mickelson SA et al. Reverse deflection prevention arrangement for a bimetal in a circuit breaker. United States Patent, USA, Patent No: 5, 864, 266; 1999 Jan.
  7. IEC Low-Voltage switchgear and Controlgear, IEC Standard 60947-2; 2016.
  8. Single phase 11/√3 kV/230V or 11kV/230V oil immersed CSP distribution transformers of capacities up to & including 25 kVA, REC specification 78; 2006.