Thytronic DMC3S, Manual

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13
DMC3S - Manual - 08 - 2021
— Negative sequence overcurrent - 46
Threshold I
2
>
Type of characteristic I
2
> ( I
2
>
Curve
) DEFINITE,
IEC/BS A, B, B-LI, C,
Reset delay ( t
2
>
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
2
>
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
2
>
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
cI2
>
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 ( tt
atcI2
>
def
) 1...60 s (step 1 s)
Inverse time
[1]
First inverse time threshold ( I
2
>
inv
) 0.050...20.0 I
n
0.050...0.999 I
n
(step 0.005 I
n
)
1.00...20.00 I
n
(step 0.01 I
n
)
Operating time ( t
2
>
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
2
>>
Reset delay ( t
2
>>
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
2
>>
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
2
>>
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
cI2
>>
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
atcI2
>>
def
) 1...60 s (step 1 s)
Inverse time
Second inverse time threshold ( I
2
>
inv
) 0.050...20.0 I
n
0.050...0.999 I
n
(step 0.005 I
n
)
1.00...20.00 I
n
(step 0.01 I
n
)
Operating time ( t
2
>
inv
) 0.02...60.0 s
0.02...9.99 s (step 0.01 s)
10.0...60.0 s (step 0.1 s)
Note 1 Inverse time curve IEC 255-3/BS142 (type A or SIT): t = 0.14 · t
2
>
inv
/ [(I
2
/I
2
>
inv
)
0.02
- 1]
Very inverse time curve IEC 255-3/BS142 (type B or VIT): t = 13.5 · t
2
>
inv
/ [(I
2
/I
2
>
inv
) - 1]
Long inverse time curve (IEC 255-3/BS B LTI): t = 120 · t
2
>
inv
/ [(I
2
/I
2
>
inv
) - 1]
Extremely inverse time curve IEC 255-3/BS142 (type C or EIT): t = 80 · t
2
>
inv
/ [(I
2
/I
2
>
inv
)
2
- 1]
t : operating time
t
2
>
inv
: operating time regulation
I
2
>
inv
: trip threshold regulation
I
2
: measured current
Asymptotic reference value: 1.1 I
2
>
inv
Minimum operating time: 0.1 s
Dynamic: 1.1 ≤ I
2
/I
2
>
inv
≤ 20
With regulation I
2
>
inv
greater than 2.5 I
n
, the upper limit of the measurement range is 30 I
n