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1MRK 505 288-UEN A
6.1.7.1
6.1.8
Technical manual
calculated to achieve through fault stability. The used stabilizing resistor value is set
by the setting SeriesResistor.
See the application manual for operating voltage and sensitivity calculation.
Logic diagram
The logic diagram shows the operation principles for the 1Ph High impedance
differential protection function HZPDIF, see figure 30. It is a simple one step function
with an additional lower alarm level. By activating inputs, the HZPDIF function can
either be blocked completely, or only the trip output.
IEC05000301 V1 EN
Figure 30:
Logic diagram for 1Ph High impedance differential protection
HZPDIF
Technical data
Table 28:
HZPDIF technical data
Function
Range or value
Operate voltage
(20-400) V
I=U/R
Reset ratio
>95%
Maximum continuous
U>Trip
power
Operate time
10 ms typically at 0 to 10 x U
Reset time
100 ms typically at 10 to 0 x U
Critical impulse time
2 ms typically at 0 to 10 x U
2
/SeriesResistor ≤200 W
d
d
d
Section 6
Differential protection
Accuracy
± 1.0% of I
r
-
-
-
-
-
77
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