Numerical generator protection REG316*4
1MRK502004-Ben
Page 24
Technical Data Func-
tions (cont’d)
Technical Data Func-
tions (cont’d)
ABB Switzerland Ltd
Utility Automation
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 0.1 to 0.5 U
N
in steps of 0.05 U
N
Trip delay 0.00 to 1.0 s in steps of 0.01 s
Reset delay 0.1 to 2.0 s in steps of 0.01 s
Reset ratio >90%
Accuracy of pick-up value (at f
N
) ±2% or ±0.005 U
N
Numbers of phases 1 or 3
Maximum tripping time without delay £50 ms
U
1R:
U
2R:
phase R voltage amplitude, voltage channel 1 (line 1)
phase R voltage amplitude, voltage channel 2 (line 2)
For 3-phase function: the characteristic is valid accordingly for the phases S and T
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