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Table 40:
HZPDIF (87) Output signals
Name
Type
Description
TRIP
BOOLEAN
Trip signal
ALARM
BOOLEAN
Alarm signal
MEASVOLT
REAL
Measured RMS voltage on CT secondary side
6.3.5
Settings
Table 41:
HZPDIF (87) Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
Operation
Disabled
Enabled
-
-
Disabled
Disable/Enable Operation
AlarmPickup
2 - 500
V
1
10
Alarm voltage level on CT secondary
tAlarm
0.000 - 60.000
s
0.001
5.000
Time delay to activate alarm
TripPickup
5 - 900
V
1
100
Pickup voltage level in volts on CT secondary
side
R series
10 - 20000
ohm
1
1800
Value of series resistor in Ohms
6.3.6
Monitored data
Table 42:
HZPDIF (87) 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, 87) 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 V TripPickup
calculated to achieve through fault stability. The used stabilizing resistor value is set by
the setting
R series
.
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 (87), see figure
. It is a simple one step function with an
Section 6
1MRK 502 048-UUS A
Differential protection
130
Technical manual
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