Current-sensing transformers (CTs) located inside the
VFI transformer provide line current information to the
electronic control. When line current exceeds the minimum
trip setting, the control initiates a signal which causes the
VFI interrupter mechanism to trip and then interrupt the
circuit. All three phases will open when the VFI interrupter
mechanism is tripped, regardless of whether the trip was
single-phase or three-phase initiated.
Refer to Service Information S285-75-1, Tri-Phase, TPG,
and TPG with SCADA Electronic Control Installation and
Operation Instructions for electronic control operation
instructions.
Standard electrical ratings for Eaton VFI transformers are as
follows:
Continuous Current (max) .....................600 A
Interrupting Current (sym./asym.)...........12 kA/20 kA
Momentary Current 10 cycles (asym.) ............20 kA
1-Second Withstand Current (sym.). .............12 kA
Making Current (sym.) ........................12 kA
For further information on Eaton VFI transformers including
additional ratings, contact your Eaton representative.
10 SubStation tranSformer inStallation and partS replacement information MN202002EN JUNE 2016
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