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1MRS 755310
Feeder Protection Relay
Technical Reference Manual
Table 4.1.4.11-2 Stages I
Feature
Set start value, I
> and I
0
0
• at definite-time characteristic
• at IDMT characteristic
Start time, typical
Time/current characteristic
• definite time
operate time, t
> and t
>>
0
0
• IDMT according to IEC 60255-3
time multiplier, k
0
• Special type of IDMT
characteristic
time multiplier, k
0
• IDMT according to
IEEE C37.112
time dial, n
0
Resetting time, maximum
Retardation time, typical
Set resetting time, t
r0
Drop-off/pick-up ratio, typical
Operate time accuracy
• at definite-time characteristic
• at IDMT characteristic
according to IEC 60255-3:
accuracy class index E
• at IDMT characteristic
according to IEEE C37.112
• at RI-type characteristic
Operation accuracy
• 1.0...10.0% I
n
• 10.0...100% I
n
• 100...400% I
n
1)
At IDMT characteristic, the relay allows settings above 0.4 x I
>0.4 x I
as equal to 0.4 x I
n
2)
Resetting time of the trip signal.
> and I
>>
0
0
Stage I
>
0
>>
1.0...100% I
n
1)
1.0...40% I
n
60 ms
0.05...300 s
Extremely inverse
Very inverse
Normal inverse
Long-time inverse
0.05...1.00
RI-type inverse
0.05...1.00
Extremely inverse
Very inverse
Moderately
inverse
1...15
2)
50 ms
30 ms
0.05...2.50 s
0.96
±2% of the set
operate time or
±25 ms
5
±7% of the
calculated operate
time
±7% of the
calculated operate
time
±5% of the set
start value or
0.05% I
n
±3% of the set
start value
.
n
REF 610
Stage I
>>
0
5.0...400% I
n
40 ms
0.04...300 s
50 ms
30 ms
0.96
±2% of the set
operate time or
±25 ms
±5% of the set
start value or
0.05% I
n
±3% of the set
start value
±3% of the set
start value
for stage I
>, but regards any setting
n
0
59
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