6.3
1Ph High impedance differential protection HZPDIF
(87)
6.3.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
1Ph High impedance differential
protection
HZPDIF
Id
SYMBOL-CC V2 EN
87
6.3.2
Introduction
The 1Ph High impedance differential protection HZPDIF (87) functions can be used when
the involved CTs 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 (87) can be used as high impedance REF protection.
6.3.3
Function block
ANSI05000363-2-en.vsd
HZPDIF (87)
ISI*
BLOCK
BLKTR
TRIP
ALARM
MEASVOLT
ANSI05000363 V2 EN
Figure 47:
HZPDIF (87) function block
6.3.4
Signals
Table 39:
HZPDIF (87) 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
1MRK 502 048-UUS A
Section 6
Differential protection
129
Technical manual
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