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Sepam Series

Selection Table

Table 4.33:
Series 80 Applications
Protection
Application
ANSI Code
S80
S81
S82
S84
T81
T82
T87
M81
M87
M88
G82
G87
G88
B80
B83
C86
Phase overcurrenta
50/51
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
Ground fault / Sensitive ground faulta
50N/51N 50G/51G
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
8
Breaker failure
50BF
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Negative sequence / unbalance
46
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Thermal overload for cables
49RMS
 
2
2
2
 
 
 
 
 
 
 
 
 
 
 
 
Thermal overload for machinesa
49RMS
 
 
 
 
2
2
2
2
2
2
2
2
2
 
 
 
Thermal overload for capacitors
49RMS
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2
Capacitor bank unbalance
51C
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
8
Restricted ground fault
64REF
 
 
 
 
2
2
2
 
 
 
2
 
2
 
 
 
Two-winding transformer differential
87T
 
 
 
 
 
 
1
 
 
1
 
 
1
 
 
 
Machine differential
87M
 
 
 
 
 
 
 
 
1
 
 
1