Experimental investigation for the maintenance of molded case circuit breaker using nano oil

The Molded Case Circuit Breaker (MCCB) is used to protect and operate electrical appliances; the periodic maintenance process is very important. MCCB traditional maintenance process is done by removing dust and internal soil by cleaning the external body only; therefore, carbon atoms are formed at the contact points. In this work, a new maintenance technique is proposed to enhance the maintenance process, adding the titanium oxide (TiO₂) into the insulating oil. The TiO₂ tends to attract the carbon atoms from the contact points, and then enhances the electrical properties of MCCB such as the DC resistance, insulation resistance and breakdown voltage of the insulating oils. To verify the validity of the new method, electrical tests were performed before and after the proposed maintenance according to IEC 60947. The results of the various MCCBs were combined to perform statistical analysis. Artificial intelligence is used to construct a model to predict a state of acceptance and rejection of the MCCB. The results indicated a significant difference between the traditional maintenance and the proposed maintenance technique using nanotechnology in enhancing MCCB life.