Ph High Impedance Differential Protection Hzpdif (87) - ABB REB650 Technical Manual

1MRK 505 277-UUS C
Section 6
6.1
6.1.1
6.1.2
6.1.3
Technical Manual
Differential protection
1Ph High impedance differential protection HZPDIF
(87)
Identification
Function description
1Ph High impedance differential
protection
Introduction
The 1Ph High impedance differential protection (HZPDIF, 87) function can be used
when the involved CTs have the same turns ratio and similar magnetizing
characteristics. It 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.
Three instances of 1Ph High impedance differential protection function (HZPDIF, 87)
can be used to provide a three phase differential protection function to be used for
example as busbar protection. One instance of HZPDIF (87) can also 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 29: HZPDIF (87) function block
Differential protection
IEC 61850 IEC 60617
identification identification
Id
HZPDIF
SYMBOL-CC V2 EN
Section 6
ANSI/IEEE C37.2
device number
87
69