Alstom MiCOM P846, Technical Manual

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Operation P846/EN OP/D
MiCOM P846
(OP) 5-3
OP
TION OF INDIVIDUAL PROTECTION FUNCTIONS 1. OPERA
1.1 ements for fast topology detection Requir
In the deregulated and market driven energy industry, modern power systems need to
op
esign limits. System topology is becoming more complex becaus
ne
eff
me
lans for all eventualities, either o
their own syst
Powe s and existing protectio
re ents. However, severe incidents involving cascade
ev eserve stability or
av actions result
sig ch as
ge s
strategi consider for the design of a modern defence plan. Its effectivene
str fer capabilities of a stability limited power system.
pen
lo
erate closer to their d e
w interconnections are being added to satisfy the deregulated flow of energy. Therefore,
icient defence plans are more important than ever to provide a fast, secure and reliable
ans of providing the power company with contingency p n
em or their neighbours’ system.
r systems are designed to withstand normal fault condition n
lays are designed to handle such ev d
ents such as multiple line outages require protection actions to pr to
oid damaging expensive transmission equipment. Generally such in
nificant topology changes and create unbalances in the system. Remedial actions su
nerator tripping or load shedding are therefore required. System topology monitoring i a
c function to ss
ongly impacts the trans
1.2 The open-line detection problem
e detector (DLO) is a device made for fast detection of the status (o
nsmission line.
The P846 open-lin or
c sed) of a radial (no mid-tap) tra
D D
D
SUBSTATION
BUSBARS
CVT
LINE BREAKERS
SHUNT REACTOR
I
CT1
LINE
P4056ENa
CT 1 CT 2
I
CT2
CT 3
REACTOR
I
LINE
DISCONNECTOR
Figure 1: Configuration of a line in a HV/EHV substation