Combined Busbar Arrangements - ABB REB670 Applications Manual

1MRK 505 337-UUS -
6.1.4.11
Application manual
Please note that table 21
contain any VT inputs.
Note that for station layouts where combined transfer and bus-coupler bay is used, as for
example is shown in figure 68, two internal bay function blocks must be allocated to such
primary bay, reducing number of available feeder bays. In such station maximum
available number of feeder bays is less for one from the values shown in table 21, on
condition that just one main CT is available from Bus-Coupler/Transfer bay. For station
with just one CT in the bus-coupler bay, it might be required, depending on the client
requirements, to provide the logic scheme for disconnection of bus-coupler CT when the
bus-coupler CB is open. For more information, refer to figure 45.

Combined busbar arrangements

There are stations which are practically a combination between two normal types of
station arrangements, which are already previously described. Some typical examples will
be shown here:
152 152 152
252 252 252
352 352 352
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Figure 69: Combination between one-and-half and double breaker station layouts
This type of stations can be encountered very often in practice. Usually the station is
arranged in such a way that double breaker bays can be, at a later stage, transformed into
one-and-half breaker setup. For busbar protection this type of station can be protected in
exactly the same way as one-and-half breaker stations described above. The same type of
IEDs can be used, and same limitations regarding the number of diameters apply.
is given for the preconfigured versions of REB670 which do not
152
152
252 252
352
352
Section 6
Differential protection
ZA
ZB
152 252
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