ABB Relion 670 series, Technical Reference Manual

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Function Range or value Accuracy
EndSection 2 (100–1000)% of IBase -
Unrestrained limit function (100–5000)% of
IBase
± 1.0% of I
n
at I ≤ I
n
± 1.0% of I at I > I
n
Second harmonic blocking (5.0–100.0)% of fundamental ± 2.0% of I
n
Fifth harmonic blocking (5.0–100.0)% of fundamental ± 6.0% of I
n
Inverse characteristics, see table
728 , 729 and table 730
19 curve types See table 728 and table
729
Operate time 25 ms typically at 0 to 10 x I
d
-
Reset time 15 ms typically at 10 to 0 x I
d
-
Critical impulse time 2 ms typically at 0 to 10 x I
d
-
Charging current compensation On/Off -
5.2 1Ph High impedance differential protection HZPDIF
(87)
5.2.1 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
5.2.2 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 CT current summation by wiring, a series resistor,
and a voltage dependent resistor which are mounted externally connected to the IED.
HZPDIF (87) can be used to protect tee-feeders or busbars. Six single phase function
blocks are available to allow application for two three-phase zones busbar protection.
1MRK505222-UUS C
Section 5
Differential protection
161
Technical reference manual