Ph High Impedance Differential Protection Hzpdif (87) - ABB Relion Technical Manual

1MRK 502 048-UUS A
6.3
6.3.1
6.3.2
6.3.3
6.3.4
Technical manual
1Ph High impedance differential protection HZPDIF
(87)
Identification
Function description
1Ph High impedance differential
protection
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.
Function block
HZPDIF (87)
ISI* TRIP
BLOCK ALARM
BLKTR MEASVOLT
ANSI05000363-2-en.vsd
ANSI05000363 V2 EN
Figure 47: HZPDIF (87) function block
Signals
Table 39: HZPDIF (87) Input signals
Name Type
ISI GROUP
SIGNAL
BLOCK BOOLEAN
BLKTR BOOLEAN
IEC 61850 IEC 60617
identification identification
HZPDIF
SYMBOL-CC V2 EN
Default Description
- Group signal for current input
0 Block of function
0 Block of trip
Section 6
Differential protection
ANSI/IEEE C37.2
device number
Id
87
129