2 topologies, 2 setup, 1 zones – GE Industrial Solutions Entellisys System User Manual User Manual
Page 86
Zones, buses, and topologies
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6
6.0.1.2 Topologies
In Figure 6-1 the bus to which the member circuit breakers of a given zone are connected can
be powered in several different ways (this assumes that the main circuit breakers M1 and M2
are each connected to a source, e.g., a utility or generator). For example, Bus 1 can be powered
from the source at M1, it can be powered from the source at M2, or it can be powered by both
sources in parallel (it can also be unpowered). The same options are available for Bus 2. How the
buses are powered depends on the state of the mains and the tie.
Circuit breakers that control the flow of power to a bus, such as M1, M2, and T1 in the example
above, are referred to in Entellisys as topology circuit breakers. For example, if M1 is open, M2 is
closed, and T1 is closed, then M2 powers both Bus 1 and Bus 2. Entellisys allows up to eight
topology circuit breakers to be specified. The state of the topology circuit breakers defines how
a given bus is powered, and each state is referred to as a topology.
Entellisys allows the user to select different settings for the multi-point functions based on the
each zone's topology. For example, a user might want different pickup settings for the zone 1
bus differential function based on whether the bus is powered by the source at M2 versus the
source at M1.
For a system with B buses, Entellisys provides 2
B
Topologies numbered 0 to 2
B
– 1. Each
topology can have its own settings associated with it for each multi-point function. (See
Multi-Source Ground-Fault Relay on page 93
, and
for more details). In the example above, there are two buses, so there are
four topologies, numbered 0 through 3. In this case, the user can select settings for topologies
1–3. Entellisys reserves topology 0 settings for the Reduced Let-Through Mode settings (see
Reduced Let-Thru Mode on page 111
for more information).
6.0.2 Setup
The setup of the zones and topologies is done by GE before the switchgear is shipped to the
customer. It is not done by the customer.
6.0.2.1 Zones
Entellisys provides a maximum of four zones. The example above only has two zones, however,
so Zone 3 and Zone 4 do not contain any member circuit breakers. The zone definitions for the
example one-line in Figure 6-1 are shown below:
Zone 1 Member Circuit Breakers
M1
T1
FL1
FL2
Zone 2 Member Circuit Breakers
M2
T1
FR1
FR2