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56
3 zone impedance protection (Z(n)RW)
]RQH LPSHGDQFH SURWHFWLRQ = Q 5:
$SSOLFDWLRQ
The impedance protection, ZnRW is intended for single-phase and two-phase systems.
The protection is a full-scheme distance protection with three impedance zones and
with individual measuring elements for all fault types. Each zone has a quadrilateral
characteristic (see figure 29). The characteristics have individual settings for the resis-
tive and reactive reaches for all measurement zones. Z
o
25
)LJXUH &KDUDFWHULVWLFV IRU WZR SKDVHWRSKDVH LPSHGDQFH PHDVXULQJ ]RQHV
jX
X
2
Z
L
X
1
ArgLd
RFPP
1
/LQH LPSHGDQFH
represents the protected line.
L
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81
R
RFPP
2
ArgDir
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