ABB REG316 4 Series Operating Instructions Manual page 652

ABB Switzerland Ltd
Utility Automation
Technical Data Func-
Technical Data Func-
tions (cont'd)
tions (cont'd)
Numerical generator protection
Table 34: Voltage balance function (60)
Features:
· Comparing of the voltage amplitudes of two groups of voltage inputs (line 1, line 2)
· 1- or 3-phase voltage measurement
· Signalling of the group having the lower voltage
· Evaluation of the voltage differences per phase for the 3-phase function and logic OR connection for
the tripping decision
· Variable tripping and reset delay
· Suppression of d. c. components
· Suppression of harmonics
Fig. 10 Tripping characteristic Voltage comparison (shown for the phases R and the setting value volt.
.
diff. = 0.2 U )
N
Settings:
Voltage difference
Trip delay
Reset delay
Reset ratio
Accuracy of pick-up value (at f
Numbers of phases
Maximum tripping time without delay
U
1R:
U
2R:
For 3-phase function: the characteristic is valid accordingly for the phases S and T
0.1 to 0.5 U
0.00 to 1.0 s in steps of 0.01 s
0.1 to 2.0 s in steps of 0.01 s
>90%
) ±2% or ±0.005 U
N
1 or 3
£50 ms
phase R voltage amplitude, voltage channel 1 (line 1)
phase R voltage amplitude, voltage channel 2 (line 2)
1MRK502004-Ben
in steps of 0.05 U
N N
N
REG316*4
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