6.1.4 Signals
Table 22: HZPDIF (87) Input signals
Name Type Default Description
ISI GROUP
SIGNAL
- Group signal for current input
BLOCK BOOLEAN 0 Block of function
BLKTR BOOLEAN 0 Block of trip
Table 23: HZPDIF (87) Output signals
Name Type Description
TRIP BOOLEAN Trip signal
ALARM BOOLEAN Alarm signal
MEASVOLT REAL Measured RMS voltage on CT secondary side
6.1.5 Settings
Table 24: 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
6.1.6 Monitored data
Table 25: HZPDIF (87) Monitored data
Name
Type Values (Range) Unit Description
MEASVOLT REAL - kV Measured RMS voltage on
CT secondary side
6.1.7 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.
Section 6 1MRK 505 277-UUS C
Differential protection
70
Technical Manual
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