Siemens SIPROTEC Compact 7SC80 Feeder Protection & Control Relay

The Siemens SIPROTEC Compact 7SC80 is a multifunctional feeder protection relay that combines protection, control, and automation in a single compact device. Designed for medium-voltage and high-voltage distribution systems, it offers reliable feeder protection along with integrated bay control capabilities.

Unlike standard feeder relays, the 7SC80 includes switchgear control, interlocking, and automation functions, making it suitable for applications where both protection and control are required. It ensures safe operation of feeders while enabling efficient control of circuit breakers and disconnectors.

With its compact and predefined hardware design, the relay allows easy installation, reduced engineering effort, and cost-effective deployment. It integrates seamlessly into modern substations using IEC 61850 communication and supports automation functions for digital grid environments.

Main Function

• Feeder Protection
• Control & Automation

Tripping / Control

• 3-pole tripping
• Control of:
  • Circuit breakers
  • Disconnectors
• Interlocking and switching operations

Technical Specifications

Protection & Functional Features

• Feeder protection functions:
  • Overcurrent protection (instantaneous & time-delayed)
  • Earth fault protection
• Detects:
  • Phase faults
  • Earth faults
• Ensures:
  • Selective fault isolation
  • Reliable feeder protection
• Integrated control features:
  • Switching device control
  • Interlocking logic
  • Automation functions

Control & Automation Features (Important USP)

• Integrated bay control functionality
• Control of multiple switching devices
• Supports:
  • Interlocking schemes
  • Automation logic
• Enables:
  • Safe switching operations
  • Reduced need for separate control units

Hardware & Compact Design

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

Communication & Protocols

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

Engineering & Software

• Configurable via DIGSI 5
• Integrated programmable logic (CFC) for:
  • Interlocking
  • Automation schemes
• Simplified commissioning and operation

Advanced Features

• Combined protection + control + automation
• Reduced hardware requirement (all-in-one device)
• Reliable SIPROTEC platform
• Monitoring and disturbance recording

Applications

• Feeder protection in distribution networks
• Substation automation systems
• Industrial power distribution
• Utility substations
• Applications requiring both protection and control