Overexcitation Protection
Setting Values
Threshold value
(characteristic curve dependent on
pickup)
1.00 to 1.20 Increments of 0.01
Threshold value
(characteristic curve independent on
pickup)
1.00 to 1.40 Increments of 0.01
Time delay (warning delay and tripping delay) 0.00 s to 60.00 s Increments of 0.01 s
Characteristic value pairs 2 to 30
Value ranges V/f 1.00 p.u. to 10.00 p.u. Increments of 0.01 p.u.
t 0 s to 100 000 s Increments of 1 s
Cooling time therm. replica 0 s to 100 000 s Increments of 1 s
Functional Measured Values
Measured Value Description
(_:2311:322) V/f
Value calculated from voltage and frequency.
(_:13591) Therm.charact.
Thermal tripping of the overexcitation protection. If the value reaches
100 %, tripping occurs.
Frequency Operating Range
0.9 ≤ f/f
rated
≤ 1.1 According to specified tolerances
10 Hz ≤ f < 0.9 f
rated
1.1 f
rated
< f ≤ 80 Hz
Slightly expanded tolerances
f < 10 Hz
f > 80 Hz
Active
Operating Times
Operate times/dropout times
Operate time at frequency 50 Hz 60 Hz
Minimum
33 ms + OOT
1
30 ms + OOT
139
Dropout time
10 ms + OOT
1
10 ms + OOT
1
Dropout Ratios
Warning, tripping (independent stage)
Approx. 0.98
Operate Curve
Thermal replica
For default setting refer to the following characteristic
curve Figure 12-19
Tolerances
V/f pickup
2 % of the setting value
Time delays 1 % of the setting value or 10 ms (min. 1.5 periods)
Thermal replica 5 % based on V/f ± 600 ms
12.46
139
Refer to protection functions, for example overcurrent protection
Technical Data
12.46 Overexcitation Protection
1532 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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