Sigma-L are the small size digital protection relays developed and manufactured by SEB for M.V. distribution plants.
SIGMA - L
DIA4L
DIA4L protection relay is compliant with Italian document Norma CEI 0-16 (2019-04) in reference to “interface protections”.
IFD4L
IFD4L relay is compliant with Italian document Norma CEI 0-16 in reference to “general protections” and is equpped with internal Logger.
IFX4L
Overcurrent and earth fault relay in accordance to CEI 0-16 norm with Data Logger. (50-51-51N-64S-64T)
SIGMA - N
Sigma-N are the digital protection relays and measurement transducers developed and manufactured by SEB for M.V. generation and distribution plants.
CU90N
Voltage regulator for tap-changer (90)
DIA4N
Interface device for self-producers, in accordance to CEI 0-16 norm (59-27-59Vo-81)
HAR1N
Frequency relay (81<>-59/81-dF/dt-dphi)
IAD3N
Directional earth fault relay (67-67N-32)
IBF4N
Breaker failure device
IDB4N
Busbar differential relay (87B)
IDG8N
Generator differential relay (87G-64Ss)
IDM8N
Machine differential relay, according to Enel spec. DV6903RO – Ed.1 (87T)
IDT8N
Overall differential relay (87T)
IFF4E
Overcurrent protection RFI category: 794/612
IFF4N
Overcurrent protection RFI category: 794/410 794/502
IFX4N
Overcurrent and earth fault relay, in accordance to CEI 0-16 norm. (50-51-51N-64S-64T)
IFD4N
Overcurrent and directional earth fault relay, in accordance to CEI 0-16 norm. (50-51-67N)
IFX4NR
Overcurrent and earth fault relay with auto-recloser (50-51-51N-64S-64T-79)
IMT4N
Motor protection relay (49-50-51R-46-51N-37-66)
ING4N
Amperomertrical generator relay (46-49-50-51-51N)
PQR4N
Generator relay (40-64R-32)
SCK4N
Synchro check relay (25)
SCK4N-D
Synchro check relay (25)
UAR4N
Voltage protection relay (59-27-59Vo-64S)
Voltage balance relay (60)
UHF4N
Protezione di tensione e frequenza (59-27-59N-81-df/dt)
UHR4N
100% stator earth fault realy (64S-100%)
ZFD8N
Directional overcurrent and earth fault relay or minimum impedance relay (67-67N-50-51-59Vo-79-21)
ZFP8N
Generator out of step realy (78)
SIGMA - S
Sigma-S are the low cost digital protection relays developed and manufactured by SEB for M.V. generation and distribution plants.
DIA3S
Protezione di interfaccia per autoproduttori a norma CEI 0-21 (2012-06) (59-27-81)
IFX3S
Overcurrent and earth fault relay in accordance to CEI 0-16 norm with Data Logger. (50-51-51N)