SIPROTEC universal 7SX800 (Siemens)
SIPROTEC 7SX800
From Siemens | for the Future | for You. The universal protection relay SIPROTEC 7SX800 has the high development and manufacturing quality of Siemens, is equipped for future challenges and is predestined for beginners and professionals alike. This efficient and compact device protects your feeders, lines and motors in the medium-voltage power grid in the utility and industrial sectors.
Directional and non-directional overcurrent protection with additional functions
Detection of ground faults of any type in compensated or isolated electrical power systems using the following functions: 3I0>, V0>, transient ground fault, cos φ,
sin φ, harmonic detection, dir. detection of intermittent ground faults, and admittance
Optimized operate times thanks to directional comparison
Motor protection functions: Startup time supervision, thermal overload protection for stator and rotor, restart inhibit, unbalanced-load protection, load-jam protection
Stator and bearing-temperature monitoring via temperature sensors with external RTD unit
Sensitive ground-fault protection (directional, non-directional) to detect stator ground faults
Controlled automatic reclosing of overhead line sections
Overvoltage and undervoltage protection
Frequency protection and rate of frequency change protection for load-shedding applications
Underfrequency load shedding in case of underfrequency, taking into consideration changed infeed conditions due to decentralized power generation
Power protection, configurable as active or reactive-power protection
PQ – Basic: Voltage unbalance; voltage changes: Overvoltage, dip, interruptions; TDD, THD, and harmonics
Directional reactive power undervoltage protection (QU protection)
Control, synchrocheck, and switchgear interlocking protection
Circuit-breaker failure protection and reignition monitoring
Graphical logic editor
Single-line representation
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