Seg HighTECH MRG3 - Parameter Protection: Voltage, Frequency, Df;Dt Protection

Manual MRG3 SEG Electronics GmbH
DOK-TD-MRG3, Rev. D 77
7.8.2 Parameter protection: Voltage, Frequency, df/dt protection
Setting range
Step (range)
Tolerance
U<
U<<
1...150 % (EXIT)
1 (1…150)
1% of the set value or 0.5 %
from U
N
tU<
tU<<
0.04...300 s (EXIT)
0.02 (0.04...1.0)
0.05 (1.0...2.0)
0.1 (2.0...5.0)
0.2 (5.0...10)
0.5 (10...20)
1.0 (20...50)
2.0 (50...100)
5.0 (100...200)
10.0 (200...300)
1% or 25ms
U>
U>>
U
N
= 100 V: 1...150 %
(EXIT)
1 (1…150)
1% of the set value or 0.5 %
from U
N
tU>
tU>>
0.04...300 s (EXIT)
0.02 (0.04...1.0)
0.05 (1.0...2.0)
0.1 (2.0...5.0)
0.2 (5.0...10)
0.5 (10...20)
1.0 (20...50)
2.0 (50...100)
5.0 (100...200)
10.0 (200...300)
1% or 25 ms
T
T = 2...99 periods
1 (2...99)
f1 - f3
30...49.99; EXIT; 50,01...70 Hz
1
40...59.99; EXIT; 60.01...80 Hz
2
0.1 (30.00...47.90)
0.01 (48.00...49.99)
0.01 (50.01...52.00)
0.1 (52.10...70.00)
0.1 (40.00...57.90)
0.01 (58.00...59.99)
0.01 (60.01...62.00)
0.1 (62.10...80.00)
0.03 Hz
tf1 - tf3
t
f,min
3
...300 s; EXIT
0.02 (0.06...1.0)
0.05 (1.0...2.0)
0.1 (2.0...5.0)
0.2 (5.0...10.0)
0.5 (10.0...20.0)
1.0 (20.0...50.0)
2.0 (50...100)
5.0 (100...200)
10.0 (200...300)
1% or 25 ms
df
0.2...10 Hz/s (EXIT)
0.1 (0.2...1.0)
0.2 (1.0...5.0)
0.5 (5.0...10.0)
0.1 Hz/s
dt
2…64 periods
1 (1…64)

2°...22° (EXIT)
1 (2…22)
1°
1/3
1Ph/3Ph
U
B
<
5...100 %
1 (1…100)
1% of the set value or
0.5 % from U
N
Table 7.2: Parameter protection: Voltage protection, Frequency protection, Frequency gradient protection
1)
At 50 Hz Rated frequency
2)
At 60 Hz Rated frequency
3)
t
f,min
min. relay operating time t
f,min
= (T+1) x 20 ms