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Substation Feeder
Protection
Applications
The following examples illustrate the versatile functions in different
applications.
Figure 8.1 – Feeder and Motor Devices used in Substation Feeder Protection
The feeder device includes three-phase overcurrent protection,
directional earth fault protection and fast arc protection. At the
incoming feeder, the instantaneous stage I>>> of the Allen-Bradley
feeder devices is blocked with the start signal of the overcurrent
stage. This prevents the trip signal if the fault occurs on the outgoing
feeder.
For the directional function of earth fault function, the status
information (on/off) of the Petersen coil is routed to one of the
digital inputs of the feeder device so that either I
is obtained.
The function I
is used in isolated networks, and the function I
0sinϕ
is used in resistance or resonant earthed networks.
8
Chapter
or I
function
0sinϕ
0cosϕ
0cosϕ
857-UM001A-EN-P – July 2009
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