Thytronic NC20 - Page 21

21
NC2 0 - Manual - 01 - 2015
TECHNICAL DATA
Inverse time
[1]
50N/51N First threshold inverse time (I
E
>
inv
) 0.100...10.00 I
n
0.100...0.999 I
n
(step 0.001 I
n
)
1.00...10.00 I
n
(step 0.01 I
n
)
I
E
>
inv
within CLP (I
ECLP>inv
) 0.100...10.00 I
n
0.100...0.999 I
n
(step 0.001 I
n
)
1.00...10.00 I
n
(step 0.01 I
n
)
I
E
>
inv
Operating time (t
E
>
inv
) 0.02...60.0 s
0.02...9.99 s (step 0.01 s)
10.0...60.0 s (step 0.1 s)
IE>> Element
I
ECLP
>> Activation time (t
ECLP>>
) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
I
E
>> Reset time delay (t
E
>>
RES
) 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
50N/51N Second threshold defi nite time (I
E
>>
def
0.100...40.0 I
n
0.100...0.999 I
n
(step 0.001 I
n
)
1.00...9.99 I
n
(step 0.01 I
n
)
10.0...40.0 I
n
(step 0.01 I
n
)
I
E
>>
def
within CLP (I
ECLP>>def
) 0.100...40.0 I
n
0.100...0.999 I
n
(step 0.001 I
n
)
1.00...9.99 I
n
(step 0.01 I
n
)
10.0...40.0 I
n
(step 0.01 I
n
)
I
E
>>
def
Operating time (t
E
>>
def
) 0.03...10.00 s (step 0.01 s)
IE>>> Element
I
ECLP
>>> Activation time (t
ECLP>>>
) 0.00...100.0 s
0.00...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
I
E
>>> Reset time delay (t
E
>>>
RES
) 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
50N/51N Third threshold defi nite time (I
E
>>>
def
) 0.100...40.0 I
n
0.100...0.999 I
n
(step 0.001 I
n
)
1.00...9.99 I
n
(step 0.01 I
n
)
10.0...40.0 I
n
(step 0.01 I
n
)
I
E
>>>
def
within CLP (I
ECLP>>>def
) 0.100...40.0 I
n
0.100...0.999 I
n
(step 0.001 I
n
)
1.00...9.99 I
n
(step 0.01 I
n
)
10.0...40.0 I
n
(step 0.01 I
n
)
I
E
>>>
def
Operating time (t
E
>>>
def
) 0.03...10.00 s (step 0.01 s)
Pickup time ≤ 0.03 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.05 s
Overshoot time 0.04 s
Pickup accuracy ± 4% 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
E
>
inv
/ [(I
EC
/I
E
>
inv
)
0.02
- 1]
Very Inverse Time (IEC 255-3/BS142 type B or VIT): t = 13.5 · t
E
>
inv
/ [(I
EC
/I
E
>
inv
) - 1]
Extremely Inverse Time (IEC 255-3/BS142 type C or EIT): t = 80 · t
E
>
inv
/ [(I
EC
/I
E
>
inv
)
2
- 1]
Moderately Inverse (ANSI/IEEE type MI): t = t
E
>
inv
· {0.01 / [(I
EC
/I
E
>
inv
)
0.02
- 1] + 0.023}
Very Inverse (ANSI/IEEE type VI): t = t
E
>
inv
· {3.922 / [(I
EC
/I
E
>
inv
)
2
- 1] + 0.098}
Extremely Inverse (ANSI/IEEE type EI): t = t
E
>
inv
· {5.64 / [(I
EC
/I
E
>
inv
)
2
- 1] + 0.024}
I
EC
: calculated residual current
t: operate time
I
E
>
inv
: threshold setting
t
E
>
inv
: operate time setting
Asymptotic reference value: 1.1 I
E
>
inv
Minimum operate time: 0.1 s
Equation is valid for 1.1 ≤ I
E
>
inv
≤ 20
With I
E
> pickup ≥ 2.5 I
n
, the upper limit is 50 I
n