Description

7SX800 Relay

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. SIPROTEC 7SX800 – the universal protection device for all your medium-voltage applications impresses with high performance and an extensive function library. You now only need one device for the various protection types with different configurations already predefined in application templates.

Highlights of  7SX800 Relay

• Slim design with a high number of IOs
• Virtual testing with SIPROTEC DigitalTwin
• IoT connectivity for easy access to your device data and associated fast response times
• Embedded cyber-security features to protect your device and maximize power grid availability
• Intuitive device operation with the web user interface
• Proven engineering tool DIGSI 5

Functions & applications of  SIPROTEC 7SX800

• 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 operation 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 an 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
• Under frequency load shedding in case of under frequency, 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, synchro check, and switchgear interlocking protection
• Circuit-breaker failure protection and reignition monitoring
• Graphical logic editor
• Single-line representation