Thytronic NA20, Manual, Page: 20 / 208

TECHNICAL DATA
20 NA20 - Manual - 04 - 2022
Inverse time
[1]
50N/51N First threshold inverse time ( I
E
>
inv
) 0.002...2.00 I
En
0.002...0.999 I
En
(step 0.001 I
En
)
1.00...2.00 I
En
(step 0.01 I
En
)
I
E
>
inv
within CLP ( I
ECLP>inv
) 0.002...2.00 I
En
0.002...0.999 I
En
(step 0.001 I
En
)
1.00...2.00 I
En
(step 0.01 I
En
)
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)
Definite time
50N/51N Second threshold definite time ( I
E
>>
def
) 0.002...10.00 I
En
0.002...0.999 I
En
(step 0.001 I
En
)
1.00...10.00 I
En
(step 0.01 I
En
)
I
E
>>
def
within CLP ( I
ECLP>>def
) 0.002...10.00 I
En
0.002...0.999 I
En
(step 0.001 I
En
)
1.00...10.00 I
En
(step 0.01 I
En
)
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)
Definite time
50N/51N Third threshold definite time ( I
E
>>>
def
) 0.002...10.00 I
En
0.002...0.999 I
En
(step 0.001 I
En
)
1.00...10.00 I
En
(step 0.01 I
En
)
I
E
>>>
def
within CLP ( I
ECLP>>>def
) 0.002...10.00 I
En
0.002...0.999 I
En
(step 0.001 I
En
)
1.00...10.00 I
En
(step 0.01 I
En
)
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 0.03 s
Pickup accuracy ± 0.5% with 0.01 I
En
, ± 0.2% with 1 I
En
Operate time accuracy 5% or ± 10 ms
‡ Breaker failure - BF
BF Phase current threshold ( I
BF
>) 0.05...1.00 I
n
(step 0.01 I
n
)
BF Residual current threshold ( I
EBF
>) 0.01...2.00 I
En
(step 0.01 I
En
)
BF Time delay( t
BF)
0.06...10.00 s (step 0.01 s)
Dropout ratio 0.95...0.98
Dropout time ≤ 0.05 s
I
BF
>Pickup accuracy ± 0.5% with 0.1 I
nL
± 0.2% with 1 I
nL
I
EBF
>Pickup accuracy ± 0.5% with 0.01 I
En
± 0.2% with 1 I
En
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
E
/ I
E
>
inv
)
0.02
- 1]
Very Inverse Time (IEC 255-3/BS142 type B or VIT): t = 13.5 ·
t
E
>
inv
/ [(I
E
/I
E
>
inv
) - 1]
Extremely Inverse Time (IEC 255-3/BS142 type C or EIT): t = 80 ·
t
E
>
inv
/ [(I
E
/I
E
>
inv
)
2
- 1]
Long time Inverse Time (IEC 255-3/BS B LI): t = 120 ·
t
E
>
inv
/ [(I
E
/I
E
>
inv
) - 1]
Moderately Inverse (ANSI/IEEE type MI): t =
t
E
>
inv
· {0.01 / [(I
E
/I
E
>
inv
)
0.02
- 1] + 0.023}
Very Inverse (ANSI/IEEE type VI): t =
t
E
>
inv
· {3.922 / [(I
E
/I
E
>
inv
)
2
- 1] + 0.098}
Extremely Inverse (ANSI/IEEE type EI): t =
t
E
>
inv
· {5.64 / [(I
E
/I
E
>
inv
)
2
- 1] + 0.024}
Electromechanical (EM): t = 0.28 ·
t
E
>
inv
/ [-0.236 · (I
E
/I
E
>
inv
)
-1
+ 0.339]
I
E
: residual current input
t : operate time
I
E
>
inv
: pickup value; t
E
>
inv
: operate time setting
Asymptotic reference value: 1.1 I
E
>
Minimum operate time: 0.1 s
Equation is valid for 1.1 ≤ I
E
/ I
E
>
inv
≤ 20 , with I
E
>
inv
pickup ≥ 0.5 I
En
, the upper limit is 10 I
En