GE P741

A
pplication Notes P74x/EN AP/N
a7
MiCOM P74
1, P742, P743 (AP) 6-
33
AP
6.5 Topology processing
The following scenarios demonstrate how the dynamic topology processing works and
accommodates anomalies and discrepancies in the scheme.
6.5.1 Single bar or double bus with bus sectionaliser
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Bus Section Closed
Isolator Closed
Isolator Closed
CB Closed
CB Closed
Zone 1 = CT1 + CT2
Zone 1 = BB1 + BB2
Check Zone = CT1 + CT2
FIGURE 13: BUS SECTION CLOSED
A zone is defined from a CT to an other CT or an open electrical element (coupler CB or
isolator).
As all the breakers and isolators are closed there is only one zone including BB1 and BB2.
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n+ 1
BB1
BB2
Zone 1 Zone 2
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n+ 1
BB1
BB2
Zone 1 Zone 2
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FIGURE 14: BUS SECTION OPEN