18
18
NC2 0 - Manual - 01 - 2015
TECHNICAL DATA
I
N>AL
Element
I
NCLP>AL
Activation time (t
NCL>PAL
) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Defi nite time
46N Alarm threshold defi nite time (I
N>ALdef
) 0.01...1.00
I
Nn
(step 0.01
I
Nn
)
I
N>ALdef
within CLP (I
NCLP>ALdef
) 0.01...1.00
I
Nn
(step 0.01
I
Nn
)
I
N>ALdef
Operating time (t
N>ALdef
) 0.03...500 s
0.03...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...500 s (step 1 s)
I
N>
Element
I
N>
Curve type (I
N>
Curve) DEFINITE, IEC/BS A, B, C,
ANSI/IEEE MI, VI, EI
I
NCLP
> Activation time (t
NCLP>
) 0.00...100.0 s (step 0.01 s)
Defi nite time
46N First threshold defi nite time (I
N>def
) 0.01...2.00
I
Nn
(step 0.01
I
Nn
)
I
N>def
within CLP (I
NCLP>def
) 0.01...2.00
I
Nn
(step 0.01
I
Nn
)
I
N>def
Operating time (t
N
>
def
) 0.03...50.0 s
0.03...9.99 s (step 0.01 s)
10.0...50.0 s (step 0.1 s)
Inverse time
[1]
46N First threshold inverse time (I
N>inv
) 0.01...1.00
I
Nn
(step 0.01
I
Nn
)
I
N>inv
within CLP (I
NCLP>inv
) 0.01...1.00
I
Nn
(step 0.01
I
Nn
)
I
N>inv
Operating time (t
N>inv
) 0.02...60.0 s
0.02...9.99 s (step 0.01 s)
10.0...60.0 s (step 0.1 s)
I
N>>
Element
I
NCLP
>> Activation time (t
NCLP>>
) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Defi nite time
46N Second threshold defi nite time (I
N>>def
)
0.01...2.00
I
Nn
(step 0.01
I
Nn
)
I
N>>def
within CLP (I
NCLP>>def
) 0.01...2.00
I
Nn
(step 0.01
I
Nn
)
I
N>>def
Operating time (t
N>>def
) 0.03...50.0 s
Pickup time ≤ 0.04 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.05 s
Overshoot time 0.04 s
Pickup accuracy ± 1% with 0.1 I
Nn
, ± 1% with 1 I
Nn
Operate time accuracy 5% or ± 10 ms
Thermal image - 49
[2]
Common confi guration:
Initial thermal image
Δ
θ
IN
(Dth
IN
) 0.0...1.0
Δ
θ
B
(step 0.1
Δ
θ
B
)
Reduction factor at inrush (K
INR
) 1.0...3.0 (step 0.1)
Thermal time constant τ (T) 1...200 min (step 1 min)
Dth
CLP
activation time (t
dthCLP
) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
DthAL1 Element
49 First alarm threshold
(Dth
AL1
) 0.3...1.0
Δ
θ
B
(step 0.1
Δ
θ
B
)
DthAL2 Element
49 Second alarm threshold
(Dth
AL2
) 0.5...1.2
Δ
θ
B
(step 0.1
Δ
θ
B
)
Dth> Element
49 Trip threshold (Dth>) 1.100...1.300
Δ
θ
B
(step 0.001
Δ
θ
B
)
Pickup accuracy ± 1% with 0.1 I
n
, ± 1% with 1 I
n
Operate time accuracy 5% or ± 10 ms
Note 1
Standard Inverse Time (IEC 255-3/BS142 type A or SIT): t = 0.14 · t
N>inv
/ [(I
NC
/I
N>inv
)
0.02
- 1]
Very Inverse Time (IEC 255-3/BS142 type B or VIT): t = 13.5 · t
N>inv
/ [(I
NC
/I
N>inv
) - 1]
Extremely Inverse Time (IEC 255-3/BS142 type C or EIT): t = 80 · t
N>inv
/ [(I
NC
/I
N>inv
)
2
- 1]
Moderately Inverse (ANSI/IEEE type MI): t = t
N>inv
· {0.01 / [(I
NC
/I
N>inv
)
0.02
- 1] + 0.023}
Very Inverse (ANSI/IEEE type VI): t = t
N>inv
· {3.922 / [(I
NC
/I
N>inv
)
2
- 1] + 0.098}
Extremely Inverse (ANSI/IEEE type EI): t = t
N>inv
· {5.64 / [(I
NC
/I
N>inv
)
2
- 1] + 0.024}
I
NC
: Neutral compensated current (see note 2)
t: operate time
I
N>inv
: threshold setting
t
N>inv
: operate time setting
Asymptotic reference value: 1.1 I
N>inv
Minimum operate time: 0.1 s
Equation is valid for 1.1 ≤ I
NC
/I
N>inv
≤ 20, with I
N>inv
pickup ≥ 0.15 I
Nn
, the upper limit is 3 I
Nn
Note 2 The equivalent thermal current is based on the greater RMS phase current. I
th
= I
LMAX
= max(I
L1RMS
, I
L2RMS
, I
L3RMS
); the computed RMS
value takes into account the contribution of fundamental and harmonic up to eleventh order.
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