ABB REF 610 Technical Reference Manual page 68

REF 610 REF 610
68
Feeder Protection Relay
Technical Reference Manual
Feature
time dial, n
Resetting time, maximum
Retardation time, typical
Set resetting time, t
0r>
Drop-off/pick-up ratio, typical 0.96
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
a)
In REF 610 revision A and B, the setting value 40% I
greater than 40% I . In revision C (or later), the full setting range is used for the IDMT calculation.
n
b)
Resetting time of the trip signal.
Stage θ>
Table 5.1.4.11.-3
Feature
Set full load current, I
θ
Set alarm level, θ
>
a
Trip level, θ
>
t
Time constant, τ
Operate time accuracy
I/I >1.2
θ
Stage ΔI>
Table 5.1.4.11.-4
Feature
Set pickup value, ΔI>
at definite-time characteristic
Start time, typical
Time/current characteristics
definite time
operate time, t >
Δ
Resetting time, maximum
Drop-off/pick-up ratio, typical
Operate time accuracy
at definite-time characteristic
*
Stage I >
0
1...15
b)
50 ms
30 ms
0.05...2.50 s
±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
n
±3% of the set start value
is used for the IDMT calculation, if the set value is
n
Value
0.30...1.50 x I
50...100%
100 %
1...200 min
±2% of the set operate time or ±1 s
Value
10...100%
100 ms
1...300 s
70 ms
0.90
±2% of the set operate time or ±75 ms
1MRS755310
Stage I >>
0
50 ms
30 ms
0.96
±2% of the set operate time or
±25 ms
±5% of the set start value +
0.05% I
n
±3% of the set start value
±3% of the set start value
n