ABB Relion 670 Series Applications Manual page 134

Section 6
Differential protection
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Figure 69:
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:
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 interconnection, zone selection and
disconnector replica facilities have to be provided for all double busbar bays. Because of the very specific
requirements on zone interconnection feature, the following should be considered for this type of
application:
• current inputs CT1 and CT2 shall be used for the first double breaker bay.
• current inputs CT3 and CT4 shall be used for the second double breaker bay.
• current inputs CT5 and CT6 shall be used for the third double breaker bay (only available in 1ph
version).
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Combination between one-and-half and double breaker station layouts
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Combination between double breaker and double busbar station layouts
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1MRK 505 370-UUS Rev. K
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Busbar protection REB670
Application manual