Siemens SIPROTEC 5 Compact 7SX82 Universal Protection Relay (Feeder, Motor & Overcurrent – Pay-Per-Function)

The Siemens SIPROTEC 5 Compact 7SX82 is a flexible and cost-effective universal protection relay designed for feeder, motor, and overcurrent protection applications. As part of the SIPROTEC 5 Compact series, it offers reliable protection performance in a compact, space-saving design.

What makes the 7SX82 unique is its pay-per-function concept, allowing users to activate only the required protection functions. This provides maximum flexibility and cost optimization, making it ideal for projects with varying protection requirements.

The relay supports a wide range of applications including feeder protection, motor protection, and general overcurrent protection, making it a versatile solution for industrial and utility systems. With its predefined hardware configuration and simplified engineering, the device ensures quick installation, easy commissioning, and seamless integration into modern automation systems.

Main Function

• Universal Protection
• Feeder Protection
• Motor Protection
• Overcurrent Protection

Tripping

• 3-pole tripping
• Fast and selective fault isolation

Technical Specifications

Protection & Functional Features

• Multi-application relay supporting:
  • Feeder protection
  • Motor protection
  • Overcurrent protection
• Pay-per-function concept:
  • Activate only required protection features
  • Scalable functionality as per application
• Protection functions include:
  • Overcurrent protection (instantaneous & time-delayed)
  • Earth fault protection
  • Thermal overload protection
  • Negative sequence (unbalance) protection
• Suitable for:
  • Radial networks
  • Industrial feeders
  • Motor-driven systems

Hardware & Compact Design

• Compact, fixed hardware design (non-modular)
• Predefined configuration for easy selection
• Typical configuration:
  • CT inputs: 4
  • VT inputs: 4
  • Binary inputs: ~11
  • Binary outputs: ~9
• Space-saving and cost-effective solution
• Ideal for standard applications

Communication & Protocols

• IEC 61850 compliant
• GOOSE messaging support
• Supports:
  • Modbus TCP
  • Standard communication interfaces
• Enables integration into automation and SCADA systems

Engineering & Software

• Configurable via DIGSI 5
• Simplified parameterization and commissioning
• Standard templates for quick setup
• Easy expansion of functions via licensing

Advanced Features

• Flexible pay-per-function licensing model
• Reliable SIPROTEC 5 technology platform
• Basic monitoring and diagnostic capabilities
• Future scalability without hardware changes

Applications

• Feeder protection in distribution networks
• Motor protection in industrial systems
• Overcurrent protection applications
• Utility substations
• Industrial automation systems