G1
G2
G3
G4
G5
G6
G7 G8
GCB1
Tie
breaker1
Tie breaker2 Tie
breaker3
Tie breaker4 Tie breaker5 Tie breaker6 Tie breaker7 Tie breaker8
GCB2 GCB3 GCB4
GCB5
GCB6 GCB7 GCB8
BB1 BB2
BB3
BB4 BB5
BB6
BB7 BB8
Figure 797: Topology of a DGMS system with all generators in a single network
G1
G2
G3
G4
GCB1
Tie breaker1 Tie breaker2
GCB2 GCB3
GCB4
G5
G6 G7 G8
Tie
breaker3 Tie
breake4
Tie breaker5
GCB5 GCB6 GCB7
GCB8
Subnetwork
1
Subnetwork 2
Subnetwork 5
BB1
BB2 BB3 BB4 BB5 BB6 BB7 BB8
(a)
(b)
(c)
Figure 798: Topology of a DGMS system with 3 subnetworks
The connection of a generator to a particular busbar can be configured by using
corresponding settings,
Gn 1 busbar Num
to
Gn 8 busbar Num
. Each of the settings
can be set to values “Bus 1” to “Bus 8” or to “Not configured”.
For example, if generator 1 is connected to busbar1, then
Gn 1 busbar Num
is set to
“Bus 1”. If suppose there are only four generators in the system, then settings
Gn 5
busbar Num
to
Gn 8 busbar Num
are set to “Not configured”.
The numbering of each GCB is assumed to be same as the number
given to the generator it is connected to. That is, GCB1 assumed to be
connected to generator 1, GCB2 to generator 2 and so on.
The tie breaker connects different busbar to form the different subnetwork groups.
Each tie breaker connects two busbars and these are referred to as bus A and bus B.
Hence, two settings are used to indicate the connection of a tie breaker to the two
busbars.
For example: If tie breaker 1 connects busbar1 and busbar2, then setting
Tie 1
busbar A Num
is set to “Bus 1” and
Tie 1 busbar B Num
is set to “Bus 2”. If a tie
breaker is not configured in the network, it is set to “Not configured”.
The entire network configuration can be modeled in a similar method using settings
Tie 2 busbar A Num, Tie 2 busbar B Num
…
Tie 8 busbar A Num and Tie 8 busbar B
Num
.
Once the entire network has been defined using the settings as mentioned above,
the module identifies the existing network topology through the status of GCBs
and the tie breakers. The status of the local GCB is obtained through confirmed
closed and open inputs GCB_CLOSED and GCB_OPEN, whereas the adjacent tie
breaker statuses are received through inputs, TIE_A_CLOSED, TIE_A_OPEN,
TIE_B_CLOSED and TIE_B_OPEN. The status of other GCBs and tie breakers are
obtained from corresponding weighted integer inputs GEN1_DATA … GEN8_DATA.
The module expects that the tie breaker which connects to the lower
numbered busbar is configured as tie breaker A and the tie breaker which
connects to the higher numbered busbar as tie breaker B.
1MRS759142 F Condition monitoring functions
REX640
Technical Manual
1407
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