ABB REF 610 - Page 68

Feature Stage I
0
> Stage I
0
>>
time dial, n 1...15
Resetting time, maximum 50 ms
b)
50 ms
Retardation time, typical 30 ms 30 ms
Set resetting time, t
0r>
0.05...2.50 s
Drop-off/pick-up ratio, typical 0.96 0.96
Operate time accuracy
*
at definite-time
characteristic
±2% of the set operate time or
±25 ms
±2% of the set operate time or
±25 ms
*
at IDMT characteristic
according to IEC 60255-3:
accuracy class index E
5
*
at IDMT characteristic
according to IEEE C37.112
±7% of the calculated operate
time
*
at RI-type characteristic ±7% of the calculated operate
time
*
at RD-type characteristic
(RXIDG)
±7% of the calculated operate
time
Operation accuracy
*
1.0...10.0% I
n
±5% of the set start value +
0.05% I
n
±5% of the set start value +
0.05% I
n
*
10.0...100% I
n
±3% of the set start value ±3% of the set start value
*
100...800% I
n
±3% of the set start value
a)
In REF 610 revision A and B, the setting value 40% I
n
is used for the IDMT calculation, if the set value is
greater than 40% I
n
. In revision C (or later), the full setting range is used for the IDMT calculation.
b)
Resetting time of the trip signal.
Table 5.1.4.11.-3 Stage θ>
Feature Value
Set full load current, I
θ
0.30...1.50 x I
n
Set alarm level, θ
a
> 50...100%
Trip level, θ
t
> 100 %
Time constant, τ 1...200 min
Operate time accuracy
I/I
θ
>1.2 ±2% of the set operate time or ±1 s
Table 5.1.4.11.-4 Stage ΔI>
Feature Value
Set pickup value, ΔI>
at definite-time characteristic 10...100%
Start time, typical 100 ms
Time/current characteristics
definite time
operate time, t
Δ
> 1...300 s
Resetting time, maximum 70 ms
Drop-off/pick-up ratio, typical 0.90
Operate time accuracy
*
at definite-time characteristic ±2% of the set operate time or ±75 ms
68
REF 610REF 610
Feeder Protection Relay
Technical Reference Manual
1MRS755310