Manual 37137B
ESDR 4 - Current Differential Protection Relay
M
oni
to
ring
st
ep 1
(X
12
= 100
%
/
Y
1 = 10 %
)
M
oni
to
ring
st
ep 2
(X
12
= 100
%
/
Y
2 = 35 %
)
Pr
ot
ec
te
d
ob
je
ct
100
20
0
C
har
act
er
ist
ic
g
rad
ient
(f
ix
ed)
= 10
%
M
oni
to
ring st
ep
2,
fi
xed l
im
it (
10
0 %
)
X
12,
Y2
and
Y1
: ad
ju
st
ab
le
N
I
10
0
P (
X
12
/Y
2)
P (
X
12
/Y
1)
Y =
I
d
[%
]
a
I
30
0
40
0
2004
-02-
12
ES
D
R
4
C
har
ac
ter
is
tic
e4
w
w
-07
04-
ken
n.
sk
f
50
0
S
I
[%
]
I
N
X =
-
+
I
b
a
I
b
I=
I
S
I
I
=
I
b
a
d
2
M
oni
to
ring
st
ep 1
fix
ed
li
m
it
(85 %
-Y
2+
Y
1)
M
oni
to
ring
st
ep 2
fixe
d l
im
it (
85 %
)
1
2
1
2
=
35
10
Figure 4-2: Characteristic
Page 16/35
© Woodward