Siemens SIPROTEC 7SJ81 Manual page 37

Designation ANSI-No. Description
Basic function 50/51
(included in all
versions)
50N/51N Time overcurrent protection ground
50N(s)/
51N(s)
49
74TC
50BF
46
37
86
–
Basic function + 67
Directional phase
and ground
67N
overcurrent,
directional
67N(s)
sensitive ground
fault, voltage and
59N
frequency protec-
27/59
tion
81 U/O
47
32/55/
81R
1)
Depending on the ground current input the function will be either
sensitive (INS) or non-sensitive (IN).
SIPROTEC 7SJ81/7SK81 V4.70, Product Information
E50417-K1150-C462-A2, Edition 02.2012
Functions
Time overcurrent protection phase
50-1, 50-2, 50-3, 51,
50N-1, 50N-2, 50N-3, 51N
Sensitive ground fault protection
1)
50Ns-1, 50Ns-2, 51Ns
Overload protection
Trip circuit supervision
Circuit-breaker failure protection
Negative-sequence protection
Undercurrent monitoring
Lock out
Parameter changeover
Monitoring functions
Control of circuit-breaker
Flexible protection functions (current
parameters)
Inrush restraint
Directional overcurrent protection phase
I>, I>>, Ip
Directional overcurrent protection ground
IE>, IE>>, IEp
1)
Directional sensitive ground fault
protection IEE>, IEE>>, IEEp
Displacement voltage
Under-/Overvoltage
Under-/Overfrequency, f<, f>
Phase rotation
Flexible protection functions (current and
voltage parameters)
Protective function for voltage, power,
power factor, frequency change
Pos.15
A
C
37