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Fig 1.18 Three Phase 3 Wire Open Delta Direct Connection Using 3 CTs Wiring Mode =
3P3O
Caution
Use PTs for voltages over 457V[line to line]. be sure to connect V
2
to V
N
as the above.
Fig 1.19 Three Phase 4 Wire Direct Connection Mode Using 3 CTs Wiring Mode = 3P4U
Caution
In three phase 4 wire direct connection, use PTs for voltages over 600V(475V)[line to line].
