6.3.5
Settings
Table 41:
HZPDIF Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
Operation
Off
On
-
-
Off
Operation Off / On
U>Alarm
2 - 500
V
1
10
Alarm voltage level in volts on CT
secondary side
tAlarm
0.000 - 60.000
s
0.001
5.000
Time delay to activate alarm
U>Trip
5 - 900
V
1
100
Operate voltage level in volts on CT
secondary side
SeriesResistor
10 - 20000
ohm
1
1800
Value of series resistor in Ohms
6.3.6
Monitored data
Table 42:
HZPDIF Monitored data
Name
Type
Values (Range)
Unit
Description
MEASVOLT
REAL
-
kV
Measured RMS voltage
on CT secondary side
6.3.7
Operation principle
The 1Ph High impedance differential protection (HZPDIF) function is based on one
current input with external stabilizing resistor and voltage dependent resistor. The
stabilizing resistor value is calculated from the function operating value UR
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.
6.3.7.1
Logic diagram
The logic diagram shows the operation principles for the 1Ph High impedance
differential protection function HZPDIF, see figure
. 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.
Section 6
1MRK 502 048-UEN A
Differential protection
120
Technical manual
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