TD_MRI1-IU_05.04_GB
17
7.3 Setting ranges and steps
7.3.1
Definite time overcurrent protection relay
Setting range
Step
Tolerance
I
SN
;
I
SL
tI>
0.2...4.0 x I
N
0.03 - 260 s
0.05; 0.1 x I
N
0.01; 0.02; 0.05; 0.1; 0.2; 0.5; 1.0;
2.0; 5.0 s
±
3 % from set value or
min.
±
1 % In
±
3 % or
±
10 ms
I
>>N
I
>>L
t
I>>
1...40 x I
N
0.03...2 s
0.1; 0.2; 0.5; 1.0 x I
N
0.01 s; 0.02 s; 0.05 s
±
3 % from set value or
min.
±
1 % In
±
3 % or
±
10 ms
U U
N
= 100 V: 10 - 110 V
U
N
= 230 V: 20 - 250 V
U
N
= 400 V: 40 - 440 V
5 V
10 V
20 V
±
5 % from set value
7.3.2
Inverse time overcurrent protection relay
According to IEC 255-4 or BS 142
Normal Inverse
[ ]
t
I
Is
t
I
s
=
−
>
014
0 02
1
,
,
Very Inverse
[ ]
t
I
Is
t
I
s
=
−
>
135
1
,
Extremely Inverse
[ ]
t
I
Is
t
I
s
=
−
>
80
2
1
Where:
t = tripping time
t
I>
= time multiplier
I = fault current
Is = Starting current
Setting range
Step
Tolerance
I
SN
;
I
SL
tI>
0.2...4.0 x I
N
0.05 - 10
0.05; 0.1 x I
N
0.01; 0.02
±
3 % from set value or
min.
±
1 % In
±
5 % for NINV
and VINV
±
7.5 % for NINV
and EINV
I
>>N
I
>>L
t
I>>
1...40 x I
N
0.03...2 s
0.1; 0.2; 0.5; 1.0 x I
N
0.01 s; 0.02 s; 0.05 s
±
3 % from set value or
min.
±
1 % In
±
3 % or
±
10 ms
U U
N
= 100 V: 10 - 110 V
U
N
= 230 V: 20 - 250 V
U
N
= 400 V: 40 - 440 V
5 V
10 V
20 V
±
5 % from set value
Summary of Contents for HighTECH Line MRI1IU
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