H-Type Busbar Arrangements - ABB REB670 Applications Manual

Section 6
Differential protection
6.1.4.5
132
differential zones, one for each busbar section. If there is an internal fault on one of the two
sections, bus-section circuit breaker and all feeder circuit breakers associated with this
section have to be tripped, leaving the other busbar section in normal operation.
ZA
152
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ANSI06000088 V1 EN
Figure 55: Example of two single busbar sections with bus-section circuit breaker
and eight feeder bays per each busbar section
This type of busbar arrangement can be quite easily protected. The most common setups
for this type of station are described in the following table.
Table 15: Typical solutions for single busbar arrangements with bus-section breaker
Version of REB670 IED
3PH; 2-zones, 4-bays BBP (A20)
3PH; 2-zones, 8-bays BBP (A31)
1Ph; 2-zones, 12-bays BBP (B20)
1Ph; 2-zones, 12-bays BBP (B21)
1Ph; 2-zones, 24-bays BBP (B31)
)
* with just one CT input from bus-section bay
Please note that table 15
contain any VT inputs.
For station with just one CT in the bus-section bay, it might be required, depending on the
client requirements, to provide the special scheme for disconnection of bus-section CT
when the bus-section CB is open. For more information, refer to figure 45.

H-type busbar arrangements

The H-type stations are often used in transmission and sub-transmission networks as load-
centre substations, as shown in figure 56. These arrangements are very similar to the single
ZB
152
152 152
Total number of feeders
in both busbar sections
)
3* /6
7* ) /14
)
11* /22
)
11* /22
)
23* /46
is given for the preconfigured versions of REB670 which do not
1MRK 505 337-UUS -
152
xx06000088_ansi.vsd
Number of REB670 IEDs
required for the scheme
1/2
1/2
3/6
3/6
3/6
Application manual