Select the time settings in such a way that admissible brief voltage peaks generated during switching opera-
tions do not generate a tripping and that stationary overvoltages can be tripped in time.
The dropout thresholds are set at the following addresses:
59-1 Vx DOut R.
Address 395
59-2 Vx DOut R.
Address 396
The minimum hysteresis is 0.6 V.
Undervoltage Protection
Undervoltage protection includes two elements.
You can set the pickup thresholds at the following addresses:
27-1 Vx Pickup
Address 381
27-2 Vx Pickup
Address 382
The times for tripping delay are set at the following addresses:
27-1 Vx Delay
Address 383
27-2 Vx Delay
Address 384
The time settings should be selected in such a way that tripping occurs in case of voltage dips that lead to
unstable operating conditions. On the other hand, time delays should be long enough to avoid tripping due to
momentary voltage dips.
The dropout thresholds are set at the following addresses:
27-1 Vx DOut R.
Address 385
27-2 Vx DOut R.
Address 386
The minimum hysteresis is 0.6 V.
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
Addr.
Parameter Setting Options Default Setting Comments
380 27 Vx OFF
ON
Alarm Only
OFF 27 Undervoltage prot. for Vx
381 27-1 Vx Pickup 10 .. 120 V 35 V Undervoltage Vx< pickup
382 27-2 Vx Pickup 10 .. 120 V 30 V Undervoltage Vx<< pickup
383 27-1 Vx Delay 0.00 .. 60.00 sec; ∞ 0.50 sec Undervoltage Vx< delay time
384 27-2 Vx Delay 0.00 .. 60.00 sec; ∞ 0.50 sec Undervoltage Vx<< delay time
385A 27-1 Vx DOut R. 1.01 .. 3.00 1.20 27-1 Vx Dropout Ratio
386A 27-2 Vx DOut R. 1.01 .. 3.00 1.20 27-2 Vx Dropout Ratio
390 59 Vx OFF
ON
Alarm Only
OFF 59 Overvoltage prot. for Vx
391 59-1 Vx Pickup 20 .. 150 V 140 V Overvoltage Vx> pickup
392 59-2 Vx Pickup 20 .. 150 V 145 V Overvoltage Vx>> pickup
393 59-1 Vx Delay 0.00 .. 60.00 sec; ∞ 0.50 sec Overvoltage Vx> delay time
394 59-2 Vx Delay 0.00 .. 60.00 sec; ∞ 0.50 sec Overvoltage Vx>> delay time
395A 59-1 Vx DOut R. 0.90 .. 0.99 0.95 59-1 Vx Dropout Ratio
396A 59-2 Vx DOut R. 0.90 .. 0.99 0.95 59-2 Vx Dropout Ratio
2.8.3
Functions
2.8 27/59 Under/Over Voltage for Vx
206 SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017
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