MCCB warm adjustment testing concept

[摘要] This paper presents an experimental investigation in to operating of thermal protection device behavior from an MCCB (Molded Case Circuit Breaker). One of the main functions of the circuit breaker is to assure protection for the circuits where mounted in for possible overloads of the circuit. The tripping mechanism for the overload protection is based on a bimetal movement during a specific time frame. This movement needs to be controlled and as a solution to control this movement we choose the warm adjustment concept. This concept is meant to improve process capability control and final output. The warm adjustment device design will create a unique adjustment of the bimetal position for each individual breaker, determined when the testing current will flow thru a phase which needs to trip in a certain amount of time. This time is predetermined due to scientific calculation for all standard types of amperages and complies with the IEC 60497 standard requirements.

[发布机构] Technical University of Cluj-Napoca, North University Centre of Baia Mare Electrical Engineering, Electronics and Computers Department, Baia Mare, Romania^1;University of Banja Luka, Faculty of Economics, Banja Luka, Bosnia and Herzegovina^2;TALION Rodic Vesna S.P. Banja Luka, Banja Luka, Bosnia and Herzegovina^3

[关键词] Experimental investigations;Molded case circuit breakers;Overload protection;Process capabilities;Scientific calculations;Standard requirements;Standard type;Thermal protection