Thytronic NC20 - Overvoltage - 59; Breaker Failure - BF

22
22
NC2 0 - Manual - 01 - 2015
TECHNICAL DATA
Overvoltage - 59
Common confi guration:
59 Operating logic (Logic59) AND/OR
U> Element
U> Curve type (U>
Curve
) DEFINITE/INVERSE
[1]
Defi nite time
59 First threshold defi nite time (
U >
def
) 0.50...1.50 U
n
(step 0.01 U
n
)
U>
def
Operating time (t
U
>
def
) 0.03...100.0 s
0.03...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Inverse time
59 First threshold inverse time (
U >
inv
) 0.50...1.50 U
n
(step 0.01 U
n
)
U>
inv
Operating time (t
U
>
inv
) 0.10...100.0 s
0.10...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
U>> Element
Defi nite time
59 Second threshold defi nite time (
U >>
def
) 0.50...1.50 U
n
(step 0.01 U
n
)
U>>
def
Operating time (t
U
>>
def
) 0.03...100.0 s
0.03...9.99 s (step 0.01 s)
10.0...100.0 s (step 0.1 s)
Pickup time ≤ 0.03 s
Dropout ratio 0.95...0.98
Dropout time ≤ 0.05 s
Overshoot time 0.03 s
Pickup accuracy ± 0.3% with 0.1U
n
, ± 0.1% with 1U
n
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
>) 0.05...1.00 I
n
(step 0.01 I
n
)
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
n
± 0.2% with 1 I
n
I
EBF
>Pickup accuracy ± 0.5% with 0.01 I
En
± 0.2% with 1 I
En
t
BF
Operate time accuracy 5% or ± 10 ms
Note 1 The mathematical formula for INVERSE curve is: t = (0.5 ∙ t
U
>
inv
) / [(U/U>
inv
) - 1 ]
t: operating time (in seconds)
t
U
>
inv
: operating time setting (referred to U/U>
inv
= 1.5 )
U: input voltage
U>
inv
: threshold setting
Asymptotic reference value: 1.1 U>
inv
Minimum operate time: 0.1 s
Equation is valid for 1.1 ≤ U/U>
inv
≤ 4
With U> pickup ≥ 0.5 U
n
, the upper limit is 2 U
n
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