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Usefulness of Permanent Power Fuse in Control Centers with Molded Case Circuit Breakers

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6 Author(s)
Wada, Yuichi ; Central Research Laboratory, Mitsubishi Electric Corporation, Amagasaki, Hyogo, Japan 661. ; Takagi, Yoichiro ; Mori, Teijiro ; Hamano, Suenobu
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The increase in electric power consumption in industry has led to the development of modern distribution systems such as control centers having high kVA ratings and high prospective fault current. In such a situation, the improvement of the system usefulness such as reliability and cost effectiveness is the essential requirement. An index is presented to evaluate the system usefulness using the cost effectiveness for fault protection in a system of given bank kVA. The index is estimated on four different system structures of control centers, including one which utilizes Permanent Power Fuses (PPF). It is presented that the PPF combined with molded case circuit breaker in main circuit effectively improves the cost effectiveness in control centers with high fault current. Operating principles of the PPF and the control center utilizing the PPF are briefly outlined.

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Industry Applications, IEEE Transactions on  (Volume:IA-16 ,  Issue: 1 )