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IEC09000308_2_en.vsd
*
Load compensation characteristic
is present only for zone 1 phase-to-
ground measurement loops.
R
(Ohm/loop)
X (Ohm/loop)
*
2
1
1
1
1
1
1
3
5
4
4
6
6
7
7
IEC09000308 V2 EN
Figure 32:
Characteristic for phase-to-ground measuring
1
RFPG
2
KNMag |Z|
where:
KN·Z=ZN
3
|Z|
where
Z denotes the positive sequence vector corresponding to the zone reach
4
LineAng
5
KNAng (negative)
6
R1 + Rn
where
Rn = (R0 - R1)/3
7
X1 +Xn
where
Xn = (X0 - X1)/3
1MRK 506 335-UUS A
Section 6
Impedance protection
101
Technical manual
Содержание REL650 series
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