P54x/EN AP/La4 Application Notes
(AP) 6-8
MiCOM P543, P544, P545 & P546
AP
Distance protection on MiCOM P54x offers advanced load blinding and disturbance
detection techniques such as power swing blocking to ensure stability when no tripping is
required. Selectable mho and quadrilateral (polygon) characteristics allow versatile
deployment as main protection for all effectively-earthed transmission and distribution
circuits, whether lines, cables or hybrid (a mix of part cable, part overhead line).
Back-up protection is also an important feature of any protection scheme. In the event of
equipment failure, such as signaling equipment or switchgear, for example, it is necessary to
provide alternative forms of fault clearance. It is desirable to provide back-up protection
which can operate with minimum time delay and yet discriminate with both the main
protection and protection elsewhere on the system.
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