Technical data

Siemens SIP · 2008
12 Motor Protection / 7SK80
12
12/25
Description Order No.
7SK80 motor protection device 7SK80oo – ooooo – o H o 0
Designation ANSI No. Description
Basic version 50/51 Time-overcurrent protection phase I>, I>>, I>>>, I
p
50N/51N Time-overcurrent protectionground I
E
>, I
E
>>, I
E
>>>,I
Ep
50N(s)/51N(s)
1)
Sensitive ground fault protection I
EE
>, I
EE
>>, I
EEp
49 Overload protection
74TC Trip circuit supervision
50BF Circuit-breaker failure protection
46 Negative-sequence protection
37 Undercurrent monitoring
86 Lockout
48 Starting time supervision
66/86 Restart inhibit
14 Locked rotor protection
51M Load jam protection
Motor statistics
Parameter changeover
Monitoring functions
Control of circuit-breaker
Flexible protection functions (current parameters)
Inrush restraint
D
2)
Basic version + directional (sensitive) ground fault, voltage and frequency protection
n 67N Directional overcurrent protection ground
I
E
>, I
E
>>, I
Ep
67N(s)
1)
Directional sensitive ground fault protection
I
EE
>, I
EE
>>, I
EEp
64/59N Displacement voltage
27/59 Under-/overvoltage
81U/O Under-/overfrequency, f<, f>
47 Phase rotation
32/55/81R Flexible protection functions (current and voltage
parameters): Protective function for voltage, power,
power factor, frequency change
E
3)
Selection and ordering data
n Basic version included
1) Depending on the ground current input
the function will be either sensitive (I
ee
)
or non-sensitive (I
e
).
2) Only if position 6 = 1, 2 or 5.
3) Only if position 6 = 3, 4 or 6.