Medium Voltage Application Guide

11165.A
11163.A
SWITCHGEAR
4.2 Standard Enclosure Configurations
Incomer Feeder Panel (IFP)
As the name implies, this panel configuration serves two purposes:
As an incomer panel. This switches the incoming main supply onto the common horizontal busbar system
of a metal-enclosed switchgear arrangement
As a feeder panel. This switches the main supply from the common horizontal busbar system of a
metal-enclosed switchgear arrangement onto a specific feeder circuit.
The enclosure will always have a main circuit breaker (normally withdrawable), housed in its own compartment of
the panel. An earth switch at the cable termination end of the circuit provides isolation during shutdown and
maintenance. Interlocking ensures that the earth switch cannot be closed until the main circuit breaker is open and
racked-out into the test position. Current transformers are fitted to interface with a protection relay for circuit
breaker trip operation.
Depending on the required function, voltage transformers can be supplied. These can be 3-phase or single phase,
either fixed or withdrawable style. A variety of low voltage equipment is used, which is mounted in its own
segregated compartment, situated at the top-front of the enclosure assembly.
AuCom provides an Incomer Feeder Panel as part of its L-Series switchgear range. This is rated at 12 kV
from 630 A to 2000 A. An IAC classification of 31.5 kA for 1 second is achieved by double skin
compartments, special locking door designs and top-exit arc flaps for pressure release.
Incomer Feeder Panel (IFP)
Typical Incomer Feeder Panel
Front view Side view Rear view
1
2
1 Circuit breaker (withdrawable)
2 Current transformer set
3 Earth switch
4 Voltage transformer (fused and
withdrawable)
3
4
Page 74 Medium Voltage Application Guide 710-12280-00A