R
jX
B
A
Measured
impedance at initital
fault position
Impedance locus at initial power
swing after the fault clearance
ZMRPSB operating characteristic
Zone 2
Zone 1
IEC99000181_2_en.vsd
IEC99000181 V2 EN-US
Figure 231:
Impedance trajectory within the distance protection zones 1 and 2
during and after the fault on line B – D
8.15.3
Setting guidelines
SEMOD171741-1 v1
8.15.3.1
Scheme communication and tripping for faults occurring during power
swinging over the protected line
SEMOD131360-4 v2
The IED includes generally up to five distance protection zones. It is possible to use
one or two of them intentionally for selective fault clearing during power swings only.
Following are the basic conditions for the operation of the so called (underreaching and
overreaching) power-swing zones:
Section 8
1MRK 504 163-UUS A
Impedance protection
460
Transformer protection RET670 2.2 ANSI
Application manual
Содержание RELION RET670
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