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The SIPROTEC devices 7SJ81 and 7SK81 feature protection functions
similar to the 7SJ80 and 7SK80 devices, which are described in the
following table.
Package
Basic func-
50/51 Time overcurrent protection phase
tionality
50-1, 50-2, 50-3, 51
50N/51N Time overcurrent protection ground
50N-1, 50N-2, 50N-3, 51N
50N(s)/51N(s) Sensitive ground fault protection
50Ns-1, 50Ns-2, 51Ns
49 Overload protection
74TC Trip circuit supervision
50BF Circuit-breaker failure protection
46 Negative-sequence protection
37 Undercurrent monitoring
86 Lockout
Parameter changeover
Monitoring functions
Control of circuit-breaker
Flexible protection functions (current parameters)
Inrush restraint
48 Start time supervision
Motor statistics
14 Locked rotor protection
51M Load jam protection
66/86 Restart blocking
SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
Function
7SJ81 7SK81
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
11
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