6.2.7
Technical data
Table 36:
(21) Technical data
Function
Range or value
Accuracy
Minimum operate current
(5-500)% of IBase
± 1.0% of I
n
Reactive reach, positive
sequence
(0.50–3000.00) Ω/phase
± 2.0% static accuracy
Conditions:
Voltage range: (0.1-1.1) x V
n
Current range: (0.5-30) x I
n
Angle: at 0 degrees and 85
degrees
Reactive reach, zero sequence,
forward and reverse
(0.50 - 3000.00) Ω/loop
Fault resistance, phase-to-
ground faults, forward and
reverse
(1.00–9000.00) Ω/loop
Fault resistance, phase-to-phase
faults, forward and reverse
(0.50–3000.00) Ω/loop
Load encroachment criteria:
Load resistance, forward and
reverse
Safety load impedance angle
(1.00–3000.00) Ω/phase
(5-70) degrees
6.3
Faulty phase identification with load enchroachment for
mho FMPSPDIS (21)
6.3.1
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
-
6.3.2
Functionality
The phase selection function is design to accurately select the proper fault loop(s) in the
distance function dependent on the fault type.
The heavy load transfer that is common in many transmission networks may in some cases
interfere with the distance protection zone reach and cause unwanted operation. Therefore
the function has a built in algorithm for load encroachment.
The output signals from the phase selection function produce important information about
faulty phase(s), which can be used for fault analysis as well.
1MRK 506 335-UUS A
Section 6
Impedance protection
147
Technical manual
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