Toshiba GR200 Series Instruction Manual page 1729
Line differential protection ied
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Table K-7 CT Requirement defined by V
Td
Requirement 1
[ms]
35
V
≧ I
k
50
V
≧ I
k
75
V
≧ I
k
100
V
≧ I
k
150
V
≧ I
k
V
: Knee point voltage [V]
k
R
: Secondary CT resistance [ohms]
ct
R
: Actual secondary burden [ohms]
2
I
: Maximum secondary fault current
fmax
I
: Maximum secondary load current
Lmax
Max{I
+ I
LMAX
I
: Minimum fault current
fmin
I
: Maximum out-flowing fault current for the special condition
fmaxout
<Accuracy limit factor of CTs is given>
Table K-8 CT Requirement defined by n'
Td [ms]
35
50
75
100
150
=
n
'
n' : Equivalent accuracy limit factor defined by the equation above.
I
: Secondary rated current
n
R
: Rated secondary burden [VA]
VA
R
: Secondary CT resistance [ohms]
ct
R
: Actual secondary burden [ohms]
2
n : Rated accuracy limit factor
I
: Maximum secondary fault current
fmax
I
: Maximum secondary load current
Lmax
Max{I
+ I
LMAX
fmin
I
: Minimum fault current
fmin
I
: Maximum out-flowing fault current for the special condition
fmaxout
(R
+ R
)×3
fmax
ct
2
(R
+ R
)×3
fmax
ct
2
(R
+ R
)×4
fmax
ct
2
(R
+ R
)×4
fmax
ct
2
(R
+ R
)×8
fmax
ct
2
/2, I
}: The larger of (I
fmin
fmaxout
Requirement 1
n' I
≧ 3.75 × I
n
fmax
n' I
≧ 3.75 × I
n
fmax
n' I
5
× I
≧
n
fmax
n' I
5
× I
≧
n
fmax
n' I
≧ 10
× I
n
fmax
+
2
R
/
I
R
VA
n
ct
n
+
R
R
2
ct
/2, I
}: The larger of (I
fmaxout
- 1706 -
(Special case)
k
Requirement 2
V
>
Max{I
+ I
/2, I
k
LMAX
fmin
V
>
Max{I
+ I
/2, I
k
LMAX
fmin
V
>
Max{I
+ I
/2, I
k
LMAX
fmin
V
>
Max{I
+ I
/2, I
k
LMAX
fmin
V
>
Max{I
+ I
/2, I
k
LMAX
fmin
+ I
/2) and I
LMAX
fmin
Requirement 2
n' I
>
Max{I
n
n' I
>
Max{I
n
n' I
>
Max{I
n
n' I
>
Max{I
n
n' I
>
Max{I
n
(K-1)
+ I
/2) and I
LMAX
fmin
6F2S1914 (0.49)
+ R
)×14.4
}
×(R
ct
2
fmaxout
× (R
+ R
)×20
}
ct
2
fmaxout
× (R
+ R
)×28.8
}
ct
2
fmaxout
× (R
+ R
)×36.8
}
ct
2
fmaxout
+ R
)×50.4
}
×(R
ct
2
fmaxout
fmaxout
+ I
/2, I
}
×18
LMAX
fmin
fmaxout
+ I
/2, I
}
×25
LMAX
fmin
fmaxout
×36
+ I
/2, I
}
LMAX
fmin
fmaxout
+ I
/2, I
}
×46
LMAX
fmin
fmaxout
×63
+ I
/2, I
}
LMAX
fmin
fmaxout
fmaxout
GRL200 (Soft 033 & 037)
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