14
DMC3S - Manual - 08 - 2021
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Overcurrent - 50/51
Threshold I>
Type of characteristic
I
> (
I>
Curve
) DEFINITE,
IEC/BS A, B, B-LI, C
Reset delay
I
> (
t
>
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
First definite time threshold (
I
>
def
) 0.050...25.0
I
n
0.050...0.995
I
n
(step 0.005
I
n
)
1.00...9.99
I
n
(step 0.01
I
n
)
10.0...25.0
I
n
(step 0.1
I
n
)
Operating time (
t
>
def
)
0.05...1000
s
0.05...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...1000 s (step 1 s)
Shrink time trip (
t
cI
>
def
)
0.05...1000
s
0.05...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...1000 s (step 1 s)
Shrink activation time (
t
atcI
>
def
)
1...60 s (step 1 s)
Inverse time
[1]
First inverse time threshold (
I
>
inv
)
0.050...20.00
I
n
0.050...0.995
I
n
(step 0.005
I
n
)
1.00...20.00
I
n
(step 0.01
I
n
)
Operating time (
t
>
inv
)
0.02...60.0
s
0.02...9.99 s (step 0.01 s)
10.0...60.0 s (step 0.1 s)
Threshold I>>
Type of characteristic (
I>>
Curve
)
DEFINITE,
IEC/BS A, B, B-LI, C
Reset delay (
t
>>
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
Second definite time threshold (
I
>>
def
)
0.050...25.0
I
n
0.050...0.995
I
n
(step 0.005
I
n
)
1.00...9.99
I
n
(step 0.01
I
n
)
10.0...25.0
I
n
(step 0.1
I
n
)
Operating time (
t
>>
def
)
0.05...1000
s
0.05...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...1000 s (step 1 s)
Shrink time trip (
t
cI
>
def
)
0.05...1000
s
0.05...9.99 s (step 0.01 s)
10.0...99.9 s (step 0.1 s)
100...1000 s (step 1 s)
Shrink activation time (
t
atcI
>
def
)
1...60 s (step 1 s)
Inverse time
Second inverse time threshold (
I
>
inv
)
0.050...20.00
I
n
0.050...0.995
I
n
(step 0.005
I
n
)
1.00...20.00
I
n
(step 0.01
I
n
)
Operating time (
t
>>
inv
)
0.02...10.00 s (step 0.01 s)
Threshold I>>>
Reset delay
I
>>> (
t
>>>
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
Third definite time threshold (
I
>>>
def
)
0.050...25.0
I
n
0.050...0.995
I
n
(step 0.005
I
n
)
1.00...9.99
I
n
(step 0.01
I
n
)
10.0...25.0
I
n
(step 0.1
I
n
)
Note 1
Inverse time curve IEC 255-3/BS142 (type A or SIT):
t = 0.14 · t>
inv
/ [(I/I>
inv
)
0.02
- 1]
Very inverse time curve IEC 255-3/BS142 (type B or VIT):
t = 13.5 · t>
inv
/ [(I/I>
inv
) - 1]
Long inverse time curve (IEC 255-3/BS B LTI):
t = 120 · t>
inv
/ [(I/I>
inv
) - 1]
Extremely inverse time curve IEC 255-3/BS142 (type C or EIT):
t = 80 · t>
inv
/ [(I/I>
inv
)
2
- 1]
t
:
operating time, minimum operating time:
0.1
s
t>
inv
:
operating time regulation
I>
inv
:
trip threshold regulation
I
:
measured current
Asymptotic reference value:
1.1
I>
inv
Dynamic: 1.1 ≤ I/I>
inv
≤ 20, with regulation I>
inv
greater than
2.5
I
n
, the upper limit of the measurement range is
30
I
n
