Finite Element Analysis of Bimetal and Thermal knob for MCCBs & Lower Link Fixture

Abstract

Finite element analysis is a computer method that predicts the behaviour of complicated system under different situation by breaking them into smaller pieces i.e. nodes and element. In order to analyse the finding a mash must be created bounded conditions must be applied and equation must be solved for structural, thermal, fluid dynamics and electromagnetic analysis in engineering, FEA is crucial. For the safety of machinery, the bimetallic strip deflection inside the MCCB must be analysed. In this case, the bimetallic strip is thought a consist of three distinct components linked together, each with a unique convection coefficient. That examines the various circumstances falling within the temperature range throughout the specific time. At what temperature range does the end of the bimetallic strip shows deflection. Temperature variation causes deflection in the strip. Deflection vs time graph that represented graphical as well as the dynamic reactions and graphs of deflection vs temperature at various ranges aid in this comprehensive of thermal properties by analysing the behaviour of bimetallic strip at various temperature. These evaluations help to ensure the MCCB operates reliable and performs optimally. The examination of thermal knob that led to change the breaker operational output from 80% to 100% is done. Its purpose is to guide the slider within the MCCB, which is essential for the slider retention under a variety of circumstances, yet allow MCCB to be adjusted for the variable current rating. An essential part of mechanism is the lower link, which is attached to the drive shaft. When the drive shaft lower loses contact with the fixed contact, a significant problem known as NO Final Stop i.e. NFS arises. The system performance may be severely impact by this failure in order to complete eliminate this issue. A fixture was created to guarantee contact between the driver shaft and the fixed contact by avoiding any misalignment or disengagement. This attachment offers a solid and dependable interface, improving the mechanism overall dependability and efficiency.