unless there are very specific reasons to enable phase-to-ground measurement. Please
note that, even with the default setting value, phase-to-ground measurement is
activated whenever appropriate, like in the case of simultaneous faults: two ground
faults at the same time, one each on the two circuits of a double line.
8.3.4.11 ZMMMXU settings
GUID-760E7792-1BA4-47B3-A437-1C7777425F57 v1
ZZer
oDb
Minimum level of impedance in % of range (ZMax-ZMin) used as indication of zero
impedance (zero point clamping). Measured values below ZZeroDb are forced to zero.
ZHiHiLim, ZHiLim, ZLowLim and ZLowLowLim
All measured values are supervised against these four settable limits. It provides the
attribute "range" in the data class MV (measured value) with the type ENUMERATED
(normal, high, low, high-high and low-low) in ZMFCPDIS.ZMMMXU.
ZLimHys
Hysteresis value in % of range (ZMax-ZMin), common for all limits. It is used to avoid
the frequent update of the value for the attribute “range”.
ZMax
Estimated maximum impedance value. An impedance that is higher than ZMax has the
quality attribute as “Out of Range”.
ZMin
Estimated minimum impedance value. An impedance that is lower than ZMin has the
quality attribute as “Out of Range”.
8.4 Pole slip protection PSPPPAM (78)
SEMOD156709-1 v2
8.4.1 Identification
SEMOD158949-2 v4
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Pole slip protection PSPPPAM U
cos
78
Section 8 1MRK 502 071-UUS A
Impedance protection
280 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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