Contact Structure Analysis And Experimental For Electromotion Forced Limited Fault Current Breaker

With the development of electric power system, single power system capacity increased, the relation in difference power systems became more and more complex. Especially in Low Voltage Distributor, these influence increasing quickly.Big and complex power system will increase the short circuit capacity, and the relation problems between difference systems will become more and more serious. With short circuit capacity increased, the expense for build a power system will increase rapidly. The relation problems need more discriminable technical in power system.As the system that near customer and have biggest short circuit current, Low voltage system should increase the capacity for its limited fault current, and the ability for discrimination, stability, reliability. These problems are resolved with low voltage breaker mainly.Most of the Mould Case Circuit Breaker that installed in second distributor is short limited current breaker. Its performance for limited fault current is the key for limited system short current, increased the capability in power system for discrimination, stability and reliability.This article is aimed to increasing the performance of MCCB limited fault current.In the first step, we analyze the factor in MCCB contact system that influence the limited current performance, and found the main factor that can improve the performance.Then,we used the electromotion forced contact to analyze the performance in difference structure MCCB. ANSYS is used for simulate the contact and electromotion forced calculation.Finally, we compared the performance trait in different contact and provide the performance result for different structure MCCB.