Siemens SIPROTEC 5 Compact 7SX800 Universal Protection Device

From Siemens | for the Future | for You

Description

The SIPROTEC 7SX800 is a universal, compact protection device that is part of the SIPROTEC 5 device series. It aids in optimizing device variants and associated training and spare-parts costs. This device is specifically developed for the efficient and compact protection of feeders, lines, and motors in medium-voltage systems, and can also be used in high-voltage areas. It covers diverse protection, automation, and monitoring applications with its modular functional scope. Its high performance and comprehensive library of functions enhance its application field up to high-voltage applications.

The universal device allows connecting a large number of inputs and outputs within a very small space and features a comprehensive library of protection functions that can be activated using function points.

The SIPROTEC 7SX800 is designed with future-proof functions. Virtual testing with SIPROTEC DigitalTwin significantly reduces testing and fault analysis times. IoT connectivity provides simple access to device data and quick response times. Integrated cybersecurity functions comprehensively protect the device and support maximum availability of the power system.

Based on the SIPROTEC 5 platform and the DIGSI 5 engineering tool, the range of functions and applications of the SIPROTEC 7SX800 are continuously expanded. It offers future-proof system solutions, high investment security, and low operating costs.

Functions

Directional and non-directional overcurrent protection with additional functions
Detection of ground faults of any type in compensated or isolated electrical power systems using specific functions like 3I0>, VO>, transient ground fault, cos φ, sin φ, harmonic, pulse detection, directional detection of intermittent ground faults, and admittance.
Optimized operate times through directional comparison.
Motor protection functions: Startup time supervision, thermal overload protection for stator and rotor, restart inhibit, unbalanced-load protection, and 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, considering 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.

Applications

Detection and selective 3-pole tripping of short circuits in electrical equipment of star networks, lines with infeed at one or two ends, parallel lines, and open-circuited or closed ring systems of all voltage levels.
Detection of ground faults in isolated or arc-suppression-coil ground power systems in star, ring, or meshed arrangement.
Backup protection for differential protection devices of all kinds for lines, transformers, generators, motors, and busbars.
Protection and interfacing of regenerative infeeds.
Protection and monitoring of double-star point capacitor banks.
Protection against thermal overload of the stator from overcurrent, cooling problems, or pollution, and of the rotor during startup due to frequent startups, excessively long startups, or blocked rotor.
Monitoring for voltage unbalance or phase outage.
Monitoring the thermal state and storage temperatures with temperature measurement.
Detection of idling drives of pumps and compressors.
Detection of ground faults and short circuits in the motor.
Protection against instability due to undervoltage.
Detection and recording of power-quality data in the medium voltage and subordinate low-voltage power system.
Load-shedding applications.
Retrofit.

Benefits

Compact and cost-effective universal protection device for a wide range of applications.
Safety through powerful and proven protection functions.
Simple operation with a graphical color display including single-line representation.
Intuitive device operation using Web UI.
Cybersecurity in accordance with NERC CIP and BDEW Whitepaper requirements (e.g., logging security-related events and alarms) available as standard.
Full compatibility between IEC 61850 Editions 1, 2.0, and 2.1.

Technical Specifications

Main function	Feeder and overcurrent protection for all voltage levels Motor protection for small to medium-sized motors (100 kW to 2 MW) Voltage and frequency protection
Inputs and outputs	4 current transformers, 4 voltage transformers (optional), 4 or 14 binary inputs, 5 or 11 binary outputs
Housing width	1/6 x 19 inches

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