Siemens SIPROTEC 5 7SY82 Universal Protection Relay

The Siemens SIPROTEC 5 7SY82 is a compact and highly flexible universal protection relay designed for connection with low-power instrument transformers (LPITs). Built on the SIPROTEC 5 Compact platform, it combines protection, control, automation, and monitoring functions into a single device, making it suitable for a wide range of medium-voltage applications.

Its patented universal LPIT input supports various sensor types compliant with IEC 61869, allowing easy integration into both new and existing substations. This reduces wiring complexity, minimizes device variation, and improves overall system efficiency.

The 7SY82 is engineered as a multi-functional protection solution, capable of handling feeders, lines, motors, generators, and capacitor banks within a single device. Its flexible function configuration using DIGSI 5 allows users to customize protection schemes based on application requirements, making it ideal for utilities, industries, and OEM panel builders.

Main Function

• Universal protection for feeders, lines, motors, generators, and capacitor banks
• Designed for LPIT (low-power CT/VT) applications
• Supports multiple protection schemes within a single device
• Suitable for MV distribution networks and digital substations

Tripping

• Selective 3-pole tripping
• Fast and reliable fault isolation for short circuits and earth faults

Inputs and Outputs

• Up to 8 LPIT sensor inputs (via RJ45 interfaces)
• Supports multiple sensor types compliant with IEC 61869
• Binary inputs: approx. 7–23
• Binary outputs: approx. 6–16 (depending on configuration)

Hardware Flexibility

• Compact SIPROTEC 5 design with flexible function configuration
• Function Point Manager enables scalable functionality
• Supports predefined and customizable application templates
• Configurable using the DIGSI 5 engineering tool

Housing

• Compact 1/3 × 19-inch housing
• Available with a small or large display
• Reduced wiring due to LPIT direct connection
• Designed for modern compact switchgear panels

Function (Key Features)

• Directional and non-directional overcurrent protection
• Distance protection and line differential protection (configurable)
• Motor and generator protection functions
• Capacitor bank protection
• Advanced earth fault detection (all grounding types)
• Overvoltage, undervoltage, and frequency protection
• Power and energy measurement functions
• Fault recording and disturbance analysis
• IEC 61850 communication (digital substation ready)
• Time synchronization (IEEE 1588 / SNTP)
• Cybersecurity features (secure communication, access control)