6.3.2
Introduction
The 1Ph High impedance differential protection HZPDIF functions can be used when
the involved CT cores have the same turns ratio and similar magnetizing
characteristics. Each utilizes an external summation of the currents in the
interconnected CTs, a series resistor, and a voltage dependent resistor which are
mounted externally connected to the IED.
The external resistor unit shall be ordered under accessories.
HZPDIF can be used as high impedance REF protection.
6.3.3
Function block
IEC05000363-2-en.vsd
HZPDIF
ISI*
BLOCK
BLKTR
TRIP
ALARM
MEASVOLT
IEC05000363 V2 EN
Figure 48:
HZPDIF function block
6.3.4
Signals
Table 44:
HZPDIF Input signals
Name
Type
Default
Description
ISI
GROUP
SIGNAL
-
Group signal for current input
BLOCK
BOOLEAN
0
Block of function
BLKTR
BOOLEAN
0
Block of trip
Table 45:
HZPDIF Output signals
Name
Type
Description
TRIP
BOOLEAN
Trip signal
ALARM
BOOLEAN
Alarm signal
MEASVOLT
REAL
Measured RMS voltage on CT secondary side
Section 6
1MRK 504 135-UEN A
Differential protection
120
Technical manual
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