The default setting of IMinPUPP and IMinPUPG is 20% of IBase where IBase is the
chosen base current for the analog input channels. The value has been proven in practice
to be suitable in most of the applications. However, there might be applications where it
is necessary to increase the sensitivity by reducing the minimum operating current down
to 10% of IED base current. This happens especially in cases, when the IED serves as a
remote back-up protection on series of very long transmission lines.
If the load current compensation is activated, there is an additional criteria IMinOpIR that
will block the phase-ground loop if the 3I0<IMinOpIR. The default setting of IMinOpIR
is 5% of the IED base current IBase.
The minimum operating fault current is automatically reduced to 75% of its set value, if
the distance protection zone has been set for the operation in reverse direction.
8.1.3.11 Setting of timers for distance protection zones
The required time delays for different distance-protection zones are independent of each
other. Distance protection zone1 can also have a time delay, if so required for selectivity
reasons. One can set the time delays for all zones (basic and optional) in a range of 0 to 60
seconds. The tripping function of each particular zone can be inhibited by setting the
corresponding Operation parameter to Disabled. Different time delays are possible for the
ph-E (tPG) and for the ph-ph (tPP) measuring loops in each distance protection zone
separately, to further increase the total flexibility of a distance protection.
8.2 Phase selection, quad, fixed angle, load encroachment
FDPSPDIS (21)
8.2.1 Identification
8.2.1.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase selection, quad, fixed angle, load
encroachment
FDPSPDIS
SYMBOL-DD V1 EN
21
1MRK 506 369-UUS - Section 8
Impedance protection
Line distance protection REL670 2.2 ANSI 215
Application manual
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