Technical Specifications
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Type: High Impedance Differential Protection Relay
Brand: Siemens Reyrolle
Model: 7PG23
Operating Principle: Voltage-operated high impedance protection
Applications: Transformer restricted earth fault protection, reactor and stator winding fault detection
Features:
Sensitive, fast fault detection for internal earth faults
High stability during external faults
User-selectable operating voltage setting
Integral non-linear voltage limiting resistor
Optional external shunt resistor for higher operating current
Operation flag indicator for clear fault identification
Compatible with Reyrolle High Impedance Software Tool for easy setting calculations
Mounted in E3 size case
Protection Functions: High impedance restricted earth fault (REF) protection
Accessories: Stabilizing resistors, setting resistors, nonlinear voltage limiting resistors (optional)
Compliance: IEC Standards
Software Support: Reyrolle High Impedance Software Tool (free download)
Main Function: Fault Recorder for medium to extra-high voltage systems
Inputs and Outputs:
Up to 40 analog channels
43 binary inputs
33 binary outputs
Hardware: Modular SIPROTEC 5 platform, expandable I/O structure
Housing Width: 1/3 to 1/1 × 19 inches
Communication: IEC 61850 Edition 1 & 2, PRP/HSR redundancy
Functions:
High-precision fault recording and event logging
Real-time power system monitoring and analysis
Data security and lifecycle transparency
Supports generators, transformers, and grid analysis
Benefits:
Improved fault diagnosis and reliability
Clear documentation of system events
Simple operation and integration with DIGSI 5
Reduced downtime and increased operational safety
Inputs/Outputs: 8–12 CT, up to 4 VT, up to 35 BI, and 16 BO
Communication: IEC 61850, IEC 60870-5-103, MODBUS RTU, DNP 3.0
Display: 128 × 128 LCD with graphical interface
Functions: Differential (87T), REF (87GH), Overcurrent (50/51), Earth Fault (50N/51N), Overvoltage (59), Undervoltage (27), Inrush (81HB2), Overfluxing (81HB5), Lockout (86)
Housing: Size 12, withdrawable design
Applications: Transformer, autotransformer, and reactor protection
