Settings; Monitored Data; Operation Principle; Logic Diagram - ABB RET650 Technical Manual

1MRK 504 135-UEN A
6.3.5
Table 46: HZPDIF Group settings (basic)
Name Values (Range)
Operation
U>Alarm
tAlarm
U>Trip
SeriesResistor
6.3.6
6.3.7
6.3.7.1
Technical manual

Settings

Unit
Off -
On
2 - 500 V
0.000 - 60.000 s
5 - 900 V
10 - 20000 ohm

Monitored data

Table 47: HZPDIF Monitored data
Name
MEASVOLT

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.

Logic diagram

The logic diagram shows the operation principles for the 1Ph High impedance
differential protection function HZPDIF, see figure 49. 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.
Step Default
- Off
1 10
0.001 5.000
1 100
1 1800
Type Values (Range)
REAL -
Section 6
Differential protection
Description
Operation Off / On
Alarm voltage level in volts on CT
secondary side
Time delay to activate alarm
Operate voltage level in volts on CT
secondary side
Value of series resistor in Ohms
Unit Description
kV Measured RMS voltage
on CT secondary side
121