Zoning And Dynamic Bus Replica; Description; North Bus Zone - GE B30 UR Series Instruction Manual

10 APPLICATION OF SETTINGS

10.2ZONING AND DYNAMIC BUS REPLICA

The figures in this section show the adopted protection zoning for the two bus sections.
To provide the bus differential zoning as shown in the figures, eight currents need to be measured. Consequently, the pro-
tection cannot be accomplished by one B30. However, as each bus has not more than six connections, two B30s can be
used.
With reference to the following diagram, the North bus differential zone is bounded by the following CTs: CT-1, CT-2 (if S-1
closed), CT-3 (if S-3 closed), CT-4 (if S-5 closed), CT-5 and CT-8. The North bus protection should operate the following
breakers: B-1, B-2 (if S-1 closed), B-3 (if S-3 closed), B-4 (if S-5 closed), B-5 and B-7.
Consequently, the B30 for the North bus should be wired and configured as follows:
• CT-1 currents should be configured as SRC 1 and used as the source 1A of the bus differential zone 1 together with
the FlexLogic "On" constant for the status.
• CT-2 currents should be configured as SRC 2 and used as the source 1B of the bus differential zone 1 together with
the status of the S-1 switch.
• CT-3 currents should be configured as SRC 3 and used as the source 1C of the bus differential zone 1 together with
the status of the S-3 switch.
• CT-4 currents should be configured as SRC 4 and used as the source 1D of the bus differential zone 1 together with
the status of the S-5 switch.
• CT-5 currents should be configured as SRC 5 and used as the source 1E of the bus differential zone 1 together with
the FlexLogic "On" constant for the status.
• CT-8 currents should be configured as SRC 6 and used as the source 1F of the bus differential zone 1 together with
the FlexLogic "On" constant for the status.
• The trip signal should be routed directly to the B-1, B-5 and B-7 breakers while it should be supervised by the status of
S-1, S-3 and S-5 for the B-2, B-3 and B-4 breakers, respectively.
Depending on utility practice, extra security may be required with respect to the status signals. This may include bringing in
both the normally opened and normally closed contacts of a switch as well as status of a peer switch (S-1 and S-2, for
example). If this is the case, the required security filtering should be accomplished using FlexLogic and a single (final) sta-
tus operand should be indicated for the status signal when setting the bus differential zone.
B-1
CT-1
CT-2 B-2
C-1 C-2
GE Multilin
C-3
S-1
S-3
CT-4
CT-3 B-3
S-2
S-4
C-4
Figure 10–3: NORTH BUS ZONE
B30 Bus Differential System
10.2 ZONING AND DYNAMIC BUS REPLICA
C-5
S-5
B-5
B-4
CT-5
CT-6
B-6
S-6

10.2.1 DESCRIPTION

10.2.2 NORTH BUS ZONE

NORTH BUS
CT-7
B-7
CT-8
SOUTH BUS
836733A1.CDR
10-3
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