Relays at the source station: Primary protection zones;Between the breaker, the fuse to load M and to the recloser R. Backup zone;Between load M fuse and load M bus (not shown) Between recloser R to the fuses P, S and WRecloser R: Primary zone;Between recloser and the fuses at loads P, S, and W Backup zone;Between the fuses at P, S, W, and their respective load buses (not shown) Fuses at the various loads:Primary protection zones;Between the load fuses and the respective load buses (not shown) Backup zones;Between the respective load buses and the loads (not shown)
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