ABB REF 610 Technical Reference Manual page 60

REF 610
60
Feeder Protection Relay
Technical Reference Manual - ANSI Version
Table 4.1.4.11-2 Elements 51N and 50N
Feature
Set pickup value, 51N and 50N
• at definite-time characteristic
• at IDMT (mode) characteristic
Pickup time, typical
Time/current characteristic
• definite time
operate time, 51N TDLY and
50N TDLY
• IDMT (mode) according to IEC
60255-3
time multiplier, 51N TD IEC
• Special type of IDMT (mode)
characteristic
time multiplier, 51N TD IEC
• IDMT (mode) according to
IEEE C37.112
time dial, 51N TD ANSI
Resetting time, maximum
Retardation time, typical
Set resetting time, 51N RSET
Drop-off/pick-up ratio, typical
Operate time accuracy
• at definite-time characteristic
• at IDMT (mode) characteristic
according to IEC 60255-3:
accuracy class index E
• at IDMT (mode) characteristic
according to IEEE C37.112
• at RI-type characteristic
Operation accuracy
• 1.0...10.0%
I (CT)
n
• 10.0...100%
I (CT)
n
• 100...400%
I (CT)
n
1)
At IDMT (mode) characteristic, the relay allows settings above 0.4 x I
regards any setting >0.4 x I
n
2)
Resetting time of the trip signal.
Element 51N
1.0...100%
I (CT)
n
1)
1.0...40%
I (CT)
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 pickup
value or
0.05%
I (CT)
n
±3% of the set pickup
value
(CT) as equal to 0.4 x I (CT).
n
1MRS 755535
Element 50N
5.0...400%
I (CT)
n
40 ms
0.05...300 s
50 ms
30 ms
0.96
±2% of the set operate
time or ±25 ms
±5% of the set pickup
value or
0.05%
I (CT)
n
±3% of the set pickup
value
±3% of the set pickup
value
(CT) for element 51N, but
n