Description

7SX85 Relay

SIPROTEC 7SX85 relay – the modular universal protection device impresses with high performance and an extensive function library. One device type covers all protection, control, and automation tasks in medium voltage, distribution, and transmission grids with 3-pole tripping and offers many advantages in terms of investment and operation. The equation for the universal protection device SIPROTEC 7SX85 is Hardware + required functions.  Choose the right device HW and complement it with functions according to your needs.  In this way, the specific device is always precisely tailored according to the respective application. The new modular Siemens SIPROTEC 7SX85 universal protection device leverages the full potential of the comprehensive and powerful SIPROTEC 5 system platform.

Functions & applications Of 7SX85 Relay

• Directional and non-directional overcurrent protection of feeders, with additional functions
• Distance protection for overhead lines and cables, with a wide variety of pickup methods
• Differential protection of overhead lines and cables of all lengths with up to 6-line ends fed from one or more sides
• Transformer differential protection for two- and multi-winding transformers with versatile, additional protection functions
• Motor protection against short circuits, all kinds of thermal overload, unbalances, and instabilities, and blocked or idle driving conditions
• Protection of generators, power units, and synchronous motors
• Detection of ground faults of any type in isolated or arc-suppression-coil grounded power systems
• Protection functions for capacitor banks, such as current-unbalance, peak overvoltage, overcurrent, overload, or differential protection
• Arc protection
• Overvoltage and under-voltage protection, with all methods
• Frequency protection and frequency-change protection
• Power protection, with all methods

7SX85 Relay Benifits

Your benefit with only 1 universal device type

• Optimization of investment and operating costs
  – Time and cost savings during project planning
  – Significant reduction of logistics and spare part costs
• Full flexibility until shortly before commissioning, easy function adjustment via the function point manager
• For grid operators: easy adaptation when network conditions change after commissioning, e. g. use as line differential protection instead of distance protection
• For industrial applications: simple addition of necessary motor or frequency protection functions to the feeder protection.
• For energy producers: Easy adaptation of device functions when connecting regenerative feeders
• Migration of existing device-specific application templates and parameterizations (7SA86, etc.)
• Optimally suited for retrofit applications