Rating and Breaking Capacity upgradation of Higher Frame (1000 Ampere) MCCB

Abstract

Molded Case Circuit Breaker (MCCB) is a mechanical switching device assembled in the mold case, capable of making, carrying and breaking currents under normal circuit conditions and also making, carrying for a specified time and breaking currents under specified abnormal circuit conditions such as overload, short circuit, Earth Fault etc. MCCB are designed for low voltage applications used in industries, institutional and commercial sectors involving motor, generator, lightning loads etc. This project focuses on thermal performance establishment with copper and aluminum links/Busbar for upgraded 1000A MCCB variant and Breaking capacity (Ics) upgradation from 480V to 690V. First objective is to establish thermal performance with Cu and Al busbars and also to validate thermal performance with external accessories (such as Plug-in base, Rear termination, Enclosure) and analysis will be done with the use of simulation tool (ANSYS Thermal). Derating chart for wide range of application will be also established for said applications. Breaking capacity upgradation from 480V to 690V involves use of FEA tools like ANSYS to find out constraints and scope for design improvement in the existing design. Detailed study and new concept for contact system of the MCCB will be developed and simulation will be done for the same. CREO software will be used for 3D modelling and drawing preparation of the proposed designs. This project will follow development cycle of Prototypes development and validation to comply IEC standard requirements.