Technical data

Siemens SIP · 2008
12 Motor Protection / 7SK80
12
12/11
Application
ANSI No. IEC Protection functions
50, 50N
I>, I>>, I>>>, I
E
>, I
E
>>, I
E
>>> Instantaneous and definite time-overcurrent protection (phase/neutral)
51, 51N
I
p
, I
Ep
Inverse time-overcurrent protection (phase/neutral)
67N
I
Edir
>, I
Edir
>>, I
Ep dir
Directional overcurrent protection, ground (definite/inverse)
67Ns/50Ns
I
EE
>,I
EE
>>, I
EEp
Directional/non-directional sensitive ground-fault detection
–
Cold load pick-up (dynamic setting change)
59N/64
V
E
, V
0
> Displacement voltage, zero-sequence voltage
50BF
Breaker failure protection
46
I
2
> Phase-balance current protection (negative-sequence protection)
47
V
2
>, phase-sequence Unbalance-voltage protection and/or phase-sequence monitoring
48
Starting time supervision
49
ϑ> Thermal overload protection
51M
Load jam protection
14
Locked rotor protection
66/86
Restart inhibit
37
I< Undercurrent monitoring
38
Temperature monitoring via internal RTD inputs or external device (RTD-box),
e.g. bearing temperature monitoring
27, 59
V<, V> Undervoltage/overvoltage protection
32
P<>, Q<> Forward-power, reverse-power protection
55
cos ϕ Power factor
81O/U
f>, f< Overfrequency/underfrequency protection
81R
df/dt Rate-of-frequency-change protection