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)
4 current transformer inputs
0 / 3 voltage transformer inputs
3 / 7 binary inputs (thresholds configurable via software)
5 / 8 binary outputs (2 changeover)
0 / 5 RTD (resistance temperature detector) inputs
1 life contact
Pluggable current and voltage terminals
Functions:
Definite and inverse time-overcurrent protection (phase/ground) (50, 50N, 51, 51N)
Directional time-overcurrent protection (ground) (67N)
Directional overcurrent protection (ground) (definite/inverse) (67Ns, 50Ns)
Displacement voltage, zero-sequence voltage (59N)
Trip-circuit supervision (74TC)
Undercurrent monitoring (37)
Temperature monitoring (38)
Thermal overload protection (49)
Load jam protection (51M)
Locked rotor protection (14)
Intermittent ground fault protection
Directional intermittent ground fault protection (67Ns)
Overcurrent protection, voltage-controlled (51V)
Restart inhibit (66/86)
Undervoltage/overvoltage protection (27/59)
Forward-power, reverse-power protection (32)
Power factor (55)
Overfrequency/underfrequency protection (81O/U)
Circuit-breaker failure protection (50BF)
Phase-balance current protection (negative-sequence protection) (46)
Unbalance-voltage protection and/or phase-sequence monitoring (47)
Start-time supervision (48)
Lockout (86)
Rate-of-frequency-change protection (81R)
Rate-of-voltage-change protection (27R/59R)
Applications:
Motor Protection: Designed for protecting induction-type asynchronous motors.
Transformer Protection: Offers backup protection for transformer differential protection, with effective inrush suppression.
Distribution Systems: Ideal for use in distribution systems and industrial environments, requiring minimal space.
Main Function: Digital fault and event recorder
Features:
Real-time fault monitoring and recording
Intelligent event logging for analysis
Integration with SIPROTEC 5 systems
High accuracy fault location using Travelling Wave technology
Simple installation – only cable length required
Applications:
Overhead transmission lines (HV & EHV)
HVDC transmission systems
High-voltage grounded and isolated networks
Subsea power cables
Benefits:
Accurate and reliable fault location
Time-saving in fault detection
Monitors long cable routes
Local support and fast deployment in Mumbai
