HZPDIF can be used to protect generator stator windings, tee-feeders or busbars,
reactors, motors, auto-transformers, capacitor banks and so on. One such function
block is used for a high-impedance restricted earth fault protection. Three such
function blocks are used to form three-phase, phase-segregated differential
protection. Several function block instances (for example, six) can be available in a
single IED.
6.2.3 Function block
IEC05000363-2-en.vsd
HZPDIF
ISI*
BLOCK
BLKTR
TRIP
ALARM
MEASVOLT
IEC05000363 V2 EN
Figure 44: HZPDIF function block
6.2.4 Signals
Table 49: HZPDIF Input signals
Name
Type Default Description
ISI GROUP
SIGNAL
- Single phase current input
BLOCK BOOLEAN 0 Block of function
BLKTR BOOLEAN 0 Block of trip
Table 50: HZPDIF Output signals
Name
Type Description
TRIP BOOLEAN Trip signal
ALARM BOOLEAN Alarm signal
MEASVOLT REAL Measured RMS voltage on CT secondary side
6.2.5 Settings
Table 51: HZPDIF Group settings (basic)
Name
Values (Range) Unit Step Default Description
Operation Off
On
- - Off Operation Off / On
U>Alarm 5 - 500 V 1 10 Alarm voltage level in volts on CT
secondary side
tAlarm 0.000 - 60.000 s 0.001 5.000 Time delay to activate alarm
U>Trip 10 - 900 V 1 100 Operate voltage level in volts on CT
secondary side
SeriesResistor 50 - 20000 Ohm 1 250 Value of series resistor in Ohms
Section 6 1MRK502052-UEN B
Differential protection
142
Technical manual
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