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”.
8.14 Power swing detection ZMRPSB
IP14499-1 v3
8.14.1 Identification
M14853-1 v3
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Power swing detection ZMRPSB
SYMBOL-EE V1 EN-US
68
8.14.2 Application
IP14969-1 v1
8.14.2.1 General
M13874-3 v3
Various changes in power system may cause oscillations of rotating units. The most
typical reasons for these oscillations are big changes in load or changes in power
system configuration caused by different faults and their clearance. As the rotating
masses strive to find a stable operate condition, they oscillate with damped
oscillations until they reach the final stability.
1MRK 506 369-UEN B Section 8
Impedance protection
Line distance protection REL670 2.2 IEC 407
Application manual
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