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Section 2
Application
Alternatively this sensitive level can be used when high sensitivity is required from busbar
differential protection (that is, energizing of the bus via long line).
Overall operating characteristic of the differential function in the IED is shown in figure 2.
DiffOperLevel
SensOperLevel
IEC06000142 V2 EN-US
Figure 2:
Integrated overall check zone feature, independent from any disconnector position, is
available. It can be used in double or triple busbar stations to secure stability of the busbar
differential protection in case of entirely wrong status indication of busbar disconnector in
any of the feeder bays.
Flexible, software based dynamic Zone Selection enables easy and fast adaptation to the most
common substation arrangements such as single busbar with or without transfer bus, double
busbar with or without transfer bus, triple busbar with or without transfer bus, one-and-a-half
breaker stations, double busbar-double breaker stations, ring busbars, and so on. The
software based dynamic Zone Selections ensures:
•
Dynamic linking of measured CT currents to the appropriate differential protection zone
as required by substation topology
•
Efficient merging of the two or more differential zones when required by substation
topology (that is load-transfer)
•
Easy zone merging initiated by closing of bus-sectionalizing disconnectors
•
Selective operation of busbar differential protection ensures tripping only of circuit
breakers connected to the faulty zone
•
Correct marshaling of backup-trip commands from internally integrated or external circuit
breaker failure protections to all surrounding circuit breakers
•
Easy incorporation of bus-section and/or bus-coupler bays (that is, tie-breakers) with one
or two sets of CTs into the protection scheme
•
Disconnector and/or circuit breaker status supervision
Advanced Zone Selection logic accompanied by optionally available end-fault and/or circuit
breaker failure protections ensure minimum possible tripping time and selectivity for faults
within the blind spot or the end zone between bay CT and bay circuit breaker. Therefore the
IED offers best possible coverage for such faults in feeder and bus-section/bus-coupler bays.
Optionally available circuit breaker failure protection, one for every CT input into the IED,
offers secure local back-up protection for the circuit breakers in the station.
30
s=0.53
IED operating characteristic
Sensitive
differential
protection
Operate
region
Differential protection
operation characteristic
SensIinBlock
I
in
1MRK 505 370-UEN D
[Primary Amps]
IEC06000142-2-en.vsdx
Busbar protection REB670
Application manual
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