7.1.6.5 Operating and inhibit conditions
Figure 64 presents a simplified logic diagram for the Power swing detection function
ZMRPSB.
The load encroachment characteristic can be switched off by setting the parameter
OperationLdCh = Off, but notice that the DFw and DRv will still be calculated from
RLdOutFw and RLdOutRv. The characteristic will in this case be only quadrilateral.
There are three different ways to form the internal INHIBIT signal:
• Logical 1 on functional input BLOCK inhibits the output START signal
instantaneously.
• The INHIBIT internal signal is activated, if the power swing has been detected
and the measured impedance remains within its operate characteristic for the
time, which is longer than the time delay set on tR2 timer. It is possible to disable
this condition by connecting the logical 1 signal to the BLKI01 functional input.
• The INHIBIT internal signal is activated after the time delay, set on tR1 timer, if
an earth-fault appears during the power swing (input IOCHECK is high) and the
power swing has been detected before the earth-fault (activation of the signal
I0CHECK). It is possible to disable this condition by connecting the logical 1
signal to the BLKI02 functional input.
7.1.7 Technical data
Table 55: ZMRPSB technical data
Function
Range or value Accuracy
Reactive reach
(0.10-3000.00) W/phase
± 2.0% static accuracy
Conditions:
Voltage range: (0.1-1.1) x U
r
Current range: (0.5-30) x I
r
Angle: at 0 degrees and 85
degrees
Resistive reach
(0.10–1000.00) W/phase
Timers (0.000-60.000) s ± 0.5% ± 10 ms
Minimum operate current (5-30)% of IBase ± 1.0% of I
r
7.2 Underimpedance protection for generators and
transformers ZGCPDIS
7.2.1 Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Underimpedance protection for
generators and transformers
ZGCPDIS 21G
Section 7 1MRK 502 048-UEN A
Impedance protection
146
Technical manual
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