Settings - ABB Relion Technical Manual

Section 6
Differential protection
6.3.5
Table 41: HZPDIF (87) Group settings (basic)
Name Values (Range)
Operation Disabled
Enabled
AlarmPickup 2 - 500
tAlarm 0.000 - 60.000
TripPickup 5 - 900
R series 10 - 20000
6.3.6
6.3.7
6.3.7.1
130
Table 40: HZPDIF (87) Output signals
Name Type
TRIP BOOLEAN
ALARM BOOLEAN
MEASVOLT REAL

Settings

Unit Step
- -
V 1
s 0.001
V 1
ohm 1
Monitored data
Table 42: HZPDIF (87) Monitored data
Name Type
MEASVOLT REAL
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.
Logic diagram
The logic diagram shows the operation principles for the 1Ph High impedance differential
protection function HZPDIF (87), see figure 48. It is a simple one step function with an
Description
Trip signal
Alarm signal
Measured RMS voltage on CT secondary side
Default Description
Disabled Disable/Enable Operation
10 Alarm voltage level on CT secondary
5.000 Time delay to activate alarm
100 Pickup voltage level in volts on CT secondary
side
1800 Value of series resistor in Ohms
Values (Range) Unit
- kV
1MRK 502 048-UUS A
Description
Measured RMS voltage on CT
secondary side
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