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SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
The SIPROTEC devices 7SJ81 and 7SK81 feature protection functions
similar to the 7SJ80 and 7SK80 devices, which are described in the
following table.
Package
Function
7SJ81 7SK81
Basic func-
tionality
50/51 Time overcurrent protection phase
50-1, 50-2, 50-3, 51
X
X
50N/51N Time overcurrent protection ground
50N-1, 50N-2, 50N-3, 51N
X
X
50N(s)/51N(s) Sensitive ground fault protection
50Ns-1, 50Ns-2, 51Ns
X
X
49 Overload protection
X
X
74TC Trip circuit supervision
X
X
50BF Circuit-breaker failure protection
X
X
46 Negative-sequence protection
X
X
37 Undercurrent monitoring
X
X
86 Lockout
X
X
Parameter changeover
X
X
Monitoring functions
X
X
Control of circuit-breaker
X
X
Flexible protection functions (current parameters)
X
X
Inrush restraint
X
X
48 Start time supervision
X
Motor statistics
X
14 Locked rotor protection
X
51M Load jam protection
X
66/86 Restart blocking
X