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Table 12: Instantaneous overvoltage protection function (59, 27) with peak value evaluation Features: ? Evaluation of instantaneous values, therefore extremely fast and frequency-independent on a wide scale ? Storing of the highest instantaneous value after start ? No suppression of DC components ? No suppression of harmonics ? Single- or three-phase ? Maximum value detection for multi-phase functions ? Variable lower limiting frequency fmin Settings: Voltage 0.01 to 2.0 UN in steps of 0.01 UN Delay 0.00 to 60 s in steps of 0.01 s Limiting fmin 25 to 50 Hz in steps of 1 Hz Accuracy of pick-up value (at 0.08 to 1.1 fN) ±3% or 0.005 UN Reset ratio >90% (for max. function) <110% (for min. function) Max. trip time at no delay (at fN) <30 ms (for max. function) <50 ms (for min. function) ? All values of settings referred to the secondaries, every zone can be set independently of the others ? 4 independent files for sets of settings. Impedance measurement -300 to 300 ?/ph in steps of 0.01 ?/ph (IN = 1 A or 2 A) -30 to 30 ?/ph in steps of 0.001 ?/ph (IN = 5 A) Zero-sequence current compensation 0 to 8 in steps of 0.01, -180° to +90° in steps of 1° Mutual impedance for parallel circuit lines 0 to 8 in steps of 0.01, -90° to +90° in steps of 1° Time step setting range 0 to 10 s in steps of 0.01 s Underimpedance starters -999 to 999 ?/ph in steps of 0.1 ?/ph (IN = 1 A or 2 A) -99.9 to 99.9 ?/ph in steps of 0.01 ?/ph (IN = 5 A) Overcurrent starters 0.5 to 10 IN in steps of 0.01 IN Min. operating current 0.1 to 2 IN in steps of 0.01 IN Back-up overcurrent 0 to 10 IN in steps of 0.01 IN Neutral current criterion 0.1 to 2 IN in steps of 0.01 IN Neutral voltage criterion 0 to 2 UN in steps of 0.01 UN Low voltage criterion for detecting, for example, a weak infeed 0 to 2 UN in steps of 0.01 UN VT supervision NPS/neutral voltage criterion NPS/neutral current criterion 0.01 to 0.5 UN in steps of 0.01 UN 0.01 to 0.5 IN in steps of 0.01 IN Accuracy (applicable for current time constants between 40 and 150 ms) amplitude error phase error Supplementary error for - frequency fluctuations of ±10 - 10 % third harmonic - 10 % fifth harmonic ±5% for U/UN >0.1 ±2° for U/UN >0.1 ±5% ±10% ±10% Minimum operating time (incl. tripping relay): 21 ms Typical operating time (incl. tripping relay): Basic distance protection function With ancillary functions activated 30 ms +8 ms Typical reset time 45 ms Numerical Generator Protection REG216 / REG216 Classic 1MRB520004-Ben Page 14 Technical data (cont′d) ABB Switzerland Ltd Power Technology Systems Table 15: Minimum reactance (40) Table 14: Underimpedance (21) Features: ? Detection of two- and three-phase short circuits (back-up protection) ? Single- or three-phase measurement ? Circular characteristic centered at origin of R-X diagram ? Lowest phase value evaluation for three-phase