ABB REJ 527 Technical Reference Manual page 32

REJ 527
32
Technical Reference Manual
Table 12: Stages I > or U
0
Feature
Start time, typical
Time/current
characteristic
• definite time
• operate times t >
0
and t >>
0
• inverse-time
characteristic for
stage I >
0
• time multiplier k of
stage I >
0
Selectable reset time
Drop-off/pick-up ratio,
typical
Operate time accuracy
at definite-time mode
Accuracy class index E
at inverse-time mode
Operation accuracy
• 1.0...100.0 % x I
n
• 2.0...80.0 % x U
n
1) Note!
Operation of the low-set earth-fault current stage, based on the inverse-time
characteristic, can be blocked by starting of the high-set stage if this function is
selected in the SGF. If set in the SGF, the operate time is determined by the set
operate time of the high-set stage at heavy fault currents. In order to obtain a trip
signal, the high-set stage must be routed to a trip output contact.
> and I >> or U >>
0 0 0
1)
Stage I > or U >
0 0
70 ms
0.10...300 s
Extremely inverse
Very inverse
Normal inverse
Long-time inverse
RI-type characteristic
RD-type characteristic
0.05...1.00
80, 100, 500 or 1000 ms
0.96
±2 % of set value or ±25 ms
5 ±25 ms
±3 % of set value +0.05 % x I
±3 % of set value +0.05 % x U
ABB Substation Automation
Products and Systems
Stage I >> or U >>
0 0
60 ms
0.10...300 s
100 ms
0.96
±2 % of set value or ±25 ms
±3 % of set value +0.05 % x I
n
±3 % of set value +0.05 % x U
n
1MRS750616-MUM
n
n