earticle

영어

In this study, characteristics of tracking occurring at the surface of Circuit Breakers’s power side was analysed and prevention method for tracking is proposed. Circuit Breakers are used in various places including industrial facilities, offices, homes for human body protection from electric shock and over-current protection for electrical equipment. However, Circuit Breakers only protects the leakage and over-current on the load side and does not prevent the tracking in itself. Generally once installed, few Circuit Breakers get replacement before failure or fire occurs. Furthermore, accumulated moisture, dust and other debris on the surface of Circuit Breakers don’t get cleansed. On the purpose of tracking prevention, some MCCBs(Milded Case Circuit Breakers) of 50AF upper grade are manufactured with unevenness in between terminal block to prevent accumulation of dust and moisture. However most of the Circuit Breakers have more space in between terminals than the space of large capacity MCCBs(Milded Case Circuit Breakers), therefore have increased fire hazards without any physical configuration to prevent fire. In this study, increase of fire hazard was identified with elongated distance between bipolar conductors, using bakelite plate of phenolic resins which is used for the manufacture of Circuit Breakers. This study proposes to prevent tracking with configuration of unevenness on bakelite plate and control of depth of the unevenness. An application of this study into the manufacture of Circuit Breakers are expected to contribute to prevent Circuit Breakers realted fires.