Abstract
The Molded Case Circuit Breaker (MCCB) is one of the critical components in the UPS system and is widely used in low-voltage electrical distribution systems. One of Korea's nuclear power plants has experienced several abnormal MCCB trips in the UPS system. Modeling and simulation assessments were performed to find the root cause of the failure. To analyze the operating principles of the MCCB, electromagnetic modeling of the MCCB using the Maxwell program was established and simulated. The actual testing of the MCCB's operating characteristics was performed to verify the simulation results. This paper suggests new methods to improve the MCCB characteristics based on the simulation and on the results of real tests. These findings suggest one mitigation method to upgrade the material quality of the restraint spring. The second is to increase the thickness of the moving part in the electromagnetic trip component.
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