IMinOp: The minimum operate current for the SIR measurement is by default set to 20%
of IBase.
8.8 Faulty phase identification with load encroachment
FMPSPDIS (21)
8.8.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Faulty phase identification with load
encroachment for mho
FMPSPDIS
S00346 V1 EN
21
8.8.2 Application
The operation of transmission networks today is in many cases close to the stability limit.
Due to environmental considerations the rate of expansion and reinforcement of the power
system is reduced for example, difficulties to get permission to build new power lines.
The ability to accurately and reliably classifying different types of fault so that single pole
tripping and autoreclosing can be used which plays an important roll in this matter.
Faulty phase identification with load encroachment for mho (FMPSPDIS) function is
designed to accurately select the proper fault loop in the Distance protection function
dependent on the fault type.
The heavy load transfer that is common in many transmission networks may in some cases
be in opposite to the wanted fault resistance coverage. Therefore, FMPSPDIS has an built-
in algorithm for load encroachment, which gives the possibility to enlarge the resistive
setting of both the Phase selection with load encroachment and the measuring zones
without interfering with the load.
The load encroachment algorithm and the blinder functions are always activated in the
phase selector. The influence from these functions on the zone measurement
characteristic has to be activated by switching the setting parameter LoadEnchMode for
the respective measuring zone(s) to Enabled.
1MRK 506 369-UUS - Section 8
Impedance protection
Line distance protection REL670 2.2 ANSI 305
Application manual
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