Design Considerations on the P. P. F. for a Control Center

Permanent Power Fuse which is called by the abbreviated name P. P. F. is an entirely new reusable fuse with excellent current limiting performance developed by Mitsubishi Electric Corp. of Japan1. Since our previous work on the development of the series of the low voltage P. P. F. up to 800 A1 ., various P. P. Fused devices have been applied to the actual field. Among these applications, the application of the P. P. F. to a control center is an example which makes the very best use of the self-recovering function of the P. P. F. This paper explains the design considerations on the P. P. F. for use in a control center. In the considerations, emphases are put on quantitative discussions on the stable performance for repeated operation and the recovery time.