ABB RELION 610 Series Product Manual page 16

Feeder Protection
REF610
Product version: C
Table 20. Non-directional earth-fault protection (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
• 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 >
0r
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
• At RD-type characteristic (RXIDG)
Operation accuracy
• 1.0...10.0% I
n
• 10.0...100% I
n
• 100...800% I
n
1) As the maximum measured current is 50 × I
I . This will speed up the operation of the protection relay making the operate time shorter than the theoretical IDMT curve would imply. However, the stage always starts according to the set
n
start value.
2) Resetting time of the trip signal.
16
>, I >>)
0 0
Stage I >
0
1.0...100% I
1.0...100% I
60 ms
> and t >> 0.05...300 s
0 0
Extremely inverse
Very inverse
Normal inverse
Long-time inverse
0.05...1.00
RI-type inverse
RD-type inverse
0.05...1.00
Extremely inverse
Very inverse
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
±7% of the calculated operate time
±5% of the set start value +0.05% I
±3% of the set start value
, a predefined current setting of 2.5 x I
n
n
1)
n
n
is used for the operate time calculation at IDMT mode of operation, if the set start value is greater than 2.5 x
n
1MRS756295 G
Stage I >>
0
5.0...800% In
50 ms
0.05...300 s
50 ms
30 ms
0.96
±2% of the set operate time or ±25 ms
±5% of the set start value +0.05% I
±3% of the set start value
±3% of the set start value
n
ABB