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Type VFI, Fluid-insulated Switchgear
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
MN285006EN March 2018
Electronic control
Line current is sensed by internally mounted current
sensing transformers. When current in excess of the
minimum trip value is detected, the control initiates a signal
which trips the faulted phase or phases, as applicable.
Refer to the applicable Installation and Operation manuals
for control operation and setting procedures.
For Tri-Phase and TPG Controls:
●
MN285008EN: Tri-Phase, TPG and TPG with SCADA
Electronic Control, Installation and Operation Instructions.
For Edison Idea Relays:
●
CA165005EN: iTAP-265 Dual Overcurrent Relay
●
Service Information S165-260-1, Use and Operations
Manual for the iTAP-260 Underground Distribution VFI
Switchgear Controller.
●
CA165002EN: iDP-210 Feeder Protection Relay
Loadbreak switch
In many configurations the Type RVAC switch is integrated
within the VFI switchgear. Refer to the Operation section
of
MN285005EN Type RVAC Fluid-Insulated Vacuum
Switchgear; Installation, Operation, and Maintenance
Instructions
for operation information for the RVAC switch.
Vacuum fault interrupters
Load and fault interruption takes place within sealed vacuum
interrupters (
Figure 1
). Vacuum interrupters provide fast, low
energy arc interruption and produce no arcing by-products to
contaminate the insulating fluid.
Figure 1 . Vacuum fault interupter assembly
Bushings
600 A deadbreak aluminum type bushings, when furnished,
conform to IEEE Std 386™-2006 standard. The standard
200 A interface for 15 and 25 kV class underground
distribution switchgear is an Eaton’s Cooper Power series
200 A bushing well. For 35 kV class, the standard 200 A
interface is an Eaton’s Cooper Power series 200 A one-piece
loadbreak bushing. Both conform to IEEE Std 386™-2006
standard.
Bushings are mounted in-line and are located a minimum of
610 mm (24 inches) above the pad.
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Figure 2 . VFI switchgear components
Fluid Drain Plug and Sampler
(not visible in view)
Grounding Lugs
(not visible in view)
Bushings
Wells
Tri-Phase
Control
Recessed Lifting Provisions
(not visible in view)
Interruptor Operating Handle
Fluid Level Sight Glass
Semaphores
Operation One-Line
Diagram
Tri-Phase
Control
Figure 1 . Vacuum fault interrupter assembly
Flux Shift
Tripper
Vacuum Fault
Interrupter
