Siemens 7SR23 DAD, Manual

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Chapter 7) 7SR23 DAD Applications Guide
©2013 Siemens Protection Devices Limited Chapter 7 Page 37 of 42
6.6 IEC61850 Applications
6.6.1 IEC61850 Implementation
Figure 6-8 IEC 61850 Bus
The IEC61850 comms bus between items of primary plant and the relays provides high speed, secure data
transfer. The protocol bus can be used to:
Replace wiring between plant and relays e.g. status information and tripping signals.
Reduce tripping times (using Goose messaging in place of binary outputs / wiring).
Implement intelligent prioritized tripping e.g. where faults are detected in two zones of protection.
Re-allocate busbar loads after a busbar trip occurrence.
6.6.2 Discrimination for ‘Dual Zone’ Faults
Where a fault can be detected by more than one protection this will cause tripping of two sets of protection e.g. for
faults F5 and F6 in Figure 6-9 below both the circuit and busbar 1 protections will operate causing a possible
unnecessary loss of one busbar.
IEC Goose messaging can be used to detect the simultaneous operation of two protections and arrange for the
circuit CB to be tripped first. Where the fault then remains it will continue to operate the busbar protection and
then all CBs connected to the busbar can be tripped.