ABB REF 541 Product Manual page 34

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Feeder Terminal
Phase discontinuity protection, CUB3Low, Iub> (46)
Start unbalance
Operate time
Operation mode
Operation accuracy
Start time
Reset time
Reset ratio, typically
Retardation time
Operate time accuracy at DT mode
Fuse failure supervision, FuseFail, FUSEF (60)
Ratio U2/U1>
Ratio I2/I1<
Operation accuracy
BSOUT activation time (when the
task interval is 10 ms)
Reset time
Reset ratio
Fault locator, FLOC (21FL)
The fault locator function for radial distribution systems. Short-circuit localization in all kinds of distribution
networks. Earth fault localizations in effectively earthed networks and in low reactance/low resistance
earthed networks.
Fault localization accuracy
Table 7: Power quality functions
Function ANSI IEC
device no. symbol
1)
PQCU3H PQ 3Inf PQ 3Inf
1)
PQVO3H PQ 3Unf PQ 3Unf
2)
PQVO3Sd PQ 3U<> PQ 3U<> Short duration voltage variations
1) These functions are only supported in the feeder termi-
nal revisions of Release 2.0 or later.
REF 541, REF 543, REF 545.
10.0...95.0%
1.0...300.0 s
Not in use
Definite time
Note! The values below apply when f/fn = 0.95...1.05
±2.5% of set value or ±1% unit
internal time < 95 ms
total time < 100 ms
40...1000 ms (depends on the minimum pulse width set for the trip
output)
0.95
Total time for blocking: < 25 ms
Total time when current drops below start value: < 50 ms
±2% of set value or ±50 ms
10...50%
10...50%
When f/fn = 0.98...1.02
±2.0 percentage units (of settings Ratio U2/U1> and Ratio I2/I1<)
When f/fn = 0.95...1.05
±4.0 percentage units (of settings Ratio U2/U1> and Ratio I2/I1<)
Injected negative-sequence voltage = 2.00 x Ratio U2/U1>
(f/fn=0.98...1.02: < 35 ms (within the same task)
20 ms (within the same task)
for Ratio U2/U1>: 0.8...0.96
for Ratio I2/I1<: 1.04...1.2
±2.5% of the line length.
Actual fault localization accuracy depends on the fault and the
power system characteristics as described in the FLOC function
block manual, section "Result validity indicator for earth faults".
Description
Current waveform distortion measurement
Voltage waveform distortion measurement
2) This function is only supported in the feeder terminal
revisions of Release 3.5 or later
1MRS750443-MBG