Download Siemens 175V Technical data

12 Motor Protection / 7SK80
Application
ANSI No.
IEC
Protection functions
50, 50N
I>, I>>, I>>>, IE>, IE>>, IE>>>
Instantaneous and definite time-overcurrent protection (phase/neutral)
51, 51N
Ip, IEp
Inverse time-overcurrent protection (phase/neutral)
67N
IEdir>, IEdir>>, IEp dir
Directional overcurrent protection, ground (definite/inverse)
67Ns/50Ns
IEE>, IEE>>, IEEp
Directional/non-directional sensitive ground-fault detection
Cold load pick-up (dynamic setting change)
–
59N/64
VE, V0>
Displacement voltage, zero-sequence voltage
Breaker failure protection
50BF
46
I2>
Phase-balance current protection (negative-sequence protection)
47
V2>, phase-sequence
Unbalance-voltage protection and/or phase-sequence monitoring
Starting time supervision
48
ϑ>
49
Thermal overload protection
51M
Load jam protection
14
Locked rotor protection
66/86
Restart inhibit
37
I<
Undercurrent monitoring
Temperature monitoring via internal RTD inputs or external device (RTD-box),
e.g. bearing temperature monitoring
38
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
12
Siemens SIP · 2008
12/11