Numerical Overcurrent Protection
Description
The SIPROTEC 7SJ601 is a numerical overcurrent relay which, in addition to its primary use in radial distribution power systems and motor protection, can also be employed as backup for line, transformer and generator differential protection. It provides definite-time and inverse-time overcurrent protection.
Functional Overview
Distribution protection
Definite-time overcurrent protection (I>>, I>/50, IE>>, IE>/50N) and/or
inverse-time overcurrent protection (I>>, Ip/51, IE>>, IEp/51N, optional IEC or ANSI time characteristics)
Reverse interlocking
Metering (operational measurement)
Circuit-breaker / Trip contact testing
Monitoring and self-diagnostics
Hardware
Software
30 event logs with time stamp
Hardware
Local HMI
LCD display for setting parameters and analysis
Housing
Flush-mounting housing 1/6 19 inch 7XP20
Surface-mounting housing 1/6 19 inch 7XP20
Auxiliary voltages
220, 250 V DC, 115 V AC
230 V AC
24, 48 V DC
60, 110, 125 V DC