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
Summary of Contents for Relion REG670
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