ABB REL670 - Resetting IED Functions and Data; Resetting Counters and Event Lists

91
Distance protection Chapter 11
Verifying settings by secondary
injection
Table 17: Test points for phase-earth loop L3-E (Ohm/loop)
Test point Value Comments
1
R=0
2
R=RIPE
3
4
5
R=RLdFw
6 X=0
R=RLdFw
7
R=0.8·RLdFw
X=-0.386·RLdFw
]
[
2
X1XN
3
X=⋅+
]
[
2
X1XN
3
X=⋅+
]
[
2
X0.85 1
3
X
XN=⋅⋅+
]
21
R0.85 1XN )
tan(60 )
3
X
RFFwPE⎡=⋅⋅+⋅ +
⎣
°
]
[
X0.981 1XNX≈⋅+
R 0.567 ( 1 XNL)X L RFFwPE
≈
⋅+ +
3
X
2
R
FFwPE=⋅
3
R3
2
R
FFwPE=⋅ ⋅
Xtan()
R
LdFw ArgLd=⋅
X1.732RFFwPE
≈
⋅
X0.8 tan( )RLdFw ArgLd=− ⋅ ⋅