41
67N Sector
Earth fault
directional Sector
(10 thresholds
available)
Direction = Enable (directional behavior)
…
Disable (non
directional behavior)
Start Criteria = neutral current magnitude/ neutral current
basic angle
Io> = 0.002
…
8.000 In
Uo> = 0.004
…
0.700 Un
t = 30
…
60 000 ms
Sector Basic Angle = -180.0
…
+180.0°
Sector Width = 0.0
…
360.0°
Io> drop off delay = 0
…
1000 ms
Uo> drop off delay = 0
…
1000 ms
67N
Earth Fault
directional with
free
programmable
characteristic (8
thresholds
available)
Is = 0.050
–
40.000 x In
t (def) = 0.040
–
300.000 s
A = 0.005
–
200.000
P = 0.005
–
3.000
B = 0.000
–
50.000 s
Td = 0.050
–
5.000
Tr = 0.020
–
100.000 s
Voltage protection functions
59
Overvoltage
instantaneous
U>>> = 0.100 ... 3.000 Un
t = 15 ... 300 000 ms
59
Overvoltage high
U>> = 0.100 ... 3.000 Un
t = 40 ... 30 000 ms
59
Overvoltage low
U> = 0.100 ... 3.000 Un
t = 40 ... 30 000 ms
27
Undervoltage
instantaneous
U<<< = 0.10 ... 1.20 Un
t = 15 ... 30 000 ms
27
Undervoltage high U<< = 0.10 ... 1.20 Un
t = 40 ... 30 000 ms
27
Undervoltage low U< = 0.10 ... 1.20 Un
t = 40 ... 30 000 ms
25
Synchronism
check
Delta Voltage = 0.02 ... 0.40 Un
Delta Phase = 5 ... 50°
t = 0.20 ... 1000.00 s
59N
Residual
overvoltage high
Uo>> = 0.05 ... 3.00 Un
t = 20 ... 300 000 ms
59N
Residual
overvoltage low
Uo> = 0.05 ... 3.00 Un
t = 20 ... 300 000 ms
Motor protection functions
49
Thermal overload
protection with
total memory
Nominal Temperature = 50 ... 400 °C (nominal
Temperature at I nom)
Nominal current (IMn) = 0.100 ... 5.000 In (primary value of
the nominal motor current)
Initial Temperature = 10 ... 400 °C
Time Constant at I < 0.1 IMn = 10 ... 100 000 s
Time Constant at 0.1 IMn < I < 2 IMn = 10 ... 20 000 s
Time Constant at I > 2 IMn = 10 ... 20 000 s
Trip Temperature = 50 ... 400 °C
Warning Temperature = 50 ... 400 °C
Environmental Temperature = 10 ... 50 °C
Reset Temperature = 10
…
400 °C
51MS
Motor start
IMn = 0.200 ... 2.000 IMn (motor current) (2)
Is = 1.000 ... 20.000 IMn (start value)
t = 40 ... 30 000 ms
I> = 0.200 ... 0.800 Is (motor start)
Multifunction Protection and Switchbay Control
Unit
Technical Reference Manual
REF 542plus
REF 542plus
1MRS755859