Faulty Phase Identification With Load Encroachment Fmpspdis (21) - ABB RELION RET670 Applications Manual

1MRK 504 163-UUS A
8.8
8.8.1
8.8.2
Transformer protection RET670 2.2 ANSI
Application manual
SIRLevel: The setting of the parameter SIRLevel is by default set to 10. This is a
suitable setting for applications with CVT to avoid transient overreach due to the CVT
dynamics. If magnetic voltage transformers are used, set SIRLevel to 15 the highest
level.
IMinOp: The minimum operate current for the SIR measurement is by default set to
20% of IBase.
Faulty phase identification with load encroachment
FMPSPDIS (21)
Identification
Function description
Faulty phase identification with load
encroachment for mho
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.
Impedance protection
IEC 61850 IEC 60617
identification identification
FMPSPDIS
S00346 V1 EN-US
Section 8
SEMOD153819-1 v5
SEMOD155879-2 v3
ANSI/IEEE C37.2
device number
21
SEMOD154764-4 v6
317