Differential Protection for 2-Winding Transformers (87T)
Overcurrent & Voltage Protection (50/51, 27/59)
Real-Time Monitoring & Diagnostics
User-Configurable Logic and Settings
Front USB & Rear RS485 Communication Ports
IEC 61850 Compatible
Self-Monitoring and Fault Recording
Local Support & Supply in Mumbai, India
Main Functions:
Merging unit for CTs and VTs (conventional & LPITs)
Bay unit for distributed busbar protection (SIPROTEC 7SS85)
Breaker control and monitoring
Backup protection functions
Phasor Measurement Unit (PMU) capability (IEEE C37.118)
Sampling and Communication:
Up to 4 SMV streams (IEC 61850-9-2 LE or IEC 61869 flexible streams)
32 analog channels (configurable for CTs/VTs)
Redundant Ethernet communication via PRP protocol
Time synchronization: IEEE 1588v2/PTP
IEC 61850-8-1 (GOOSE, MMS) & IEC 61850-9-2 compliant
Protection Functions:
Non-directional and directional overcurrent (50/51, 67/67N)
Overvoltage/undervoltage (27/59)
Circuit-breaker failure protection (50BF)
Auto-reclosing (79), Synchrocheck (25), Trip-circuit supervision (74TC)
Additional Features:
Arc protection and breaker wear monitoring
4–20 mA analog inputs for process sensors (e.g., pressure, tap changer)
Temperature monitoring via TR1200 thermo-box
Web-based access and configuration
Integrated cyber security (RBAC, event logging, signed firmware)
Hardware & Design:
Modular SIPROTEC 5 structure, expandable I/Os (up to 6 modules)
1/3 × 19” to 2/1 × 19” housing
Operating temperature: -40°C to +70°C
Dual power supply redundancy
Supported Protocols:
IEC 61850, IEC 60870-5-103/-104, Modbus TCP, DNP3, PROFINET IO
Engineering:
Fully supported by DIGSI 5 software
