Settings - ABB REG650 Technical Manual

Section 6
Differential protection
6.2.5
Table 31: 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
6.2.6
6.2.7
6.2.7.1
112

Settings

Unit Step
- -
V 1
s 0.001
V 1
ohm 1
Monitored data
Table 32: 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 44. It is a simple one step
function with an additional lower alarm level. By activating inputs, the HZPDIF (87)
function can either be blocked completely, or only the trip output.
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 502 043-UUS B
Description
Measured RMS voltage on
CT secondary side
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