ABB REB670 - Page 159

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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.
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Figure 70: Combination between double breaker and double busbar station
layouts
In this type of arrangement the double breaker bay has in the same time the role of the
bus-coupler bay for normal double busbar single breaker stations. Therefore, zone
1MRK 505 370-UUS A Section 6
Differential protection
Busbar protection REB670 2.2 ANSI 153
Application manual