Description

GE  760-P5-S1-HI-A10-G-T  Digital Feeder Protection Relay

Core Functional Characteristics

1. Comprehensive Protection Functions

• Overcurrent Protection:
  Configured with Time Overcurrent (TOC) and Instantaneous Overcurrent (IOC) elements, supporting IEC/ANSI standard curves (e.g., Inverse, Very Inverse).
  • Current range: 0.1~20In (In = rated current), time setting accuracy up to 0.05s.
• Ground Fault Protection:
  • Sensitive ground fault detection (50N/51N) with directional judgment, suitable for ungrounded or arc suppression coil-grounded neutral systems.
  • Restricted ground fault protection (50GR/51GR) for transformer neutral protection, accuracy ±1%.
• Voltage Protection:
  Overvoltage/Undervoltage (59/27), negative sequence voltage (47), and zero sequence voltage (59N/27N) protection to monitor system imbalance and ground faults.
• Frequency Protection:
  Overfrequency/Underfrequency (81O/81U) protection and slip rate (df/dt) detection to ensure system frequency stability.

2. High-Precision Measurement and Metering

• Electrical Parameter Measurement:
  Measures three-phase current, voltage, power, frequency, power factor, etc., with accuracy ±0.5%.
  Supports bidirectional energy metering (import/export) with a resolution of 0.001kWh.
• Event Recording and Waveform Capture:
  • Stores ≥1,000 event records with timestamp accuracy ≤1ms.
  • Captures waveforms before and after faults (2~8 cycles) at a sampling rate of 64 points/cycle for easy fault analysis.

3. Strong Communication and Integration Capabilities

• Communication Interfaces:
  • Front-panel RS232 (for local configuration) + dual rear-panel RS485/RS422 ports.
  • Optional Ethernet port (10/100Mbps) supporting ModBus TCP/IP and DNP3.0 protocols.
• Multi-Protocol Support:
  Compatible with ModBus RTU/TCP, DNP3.0 Level 2, and IEC 60870-5-103 (optional).
  Supports ≥4 concurrent connections for seamless integration with SCADA, PLC, etc.

4. Equipment Management and Self-Diagnosis

• Circuit Breaker Condition Monitoring:
  • Tracks circuit breaker operation counts, calculates contact wear, and warns of potential faults.
  • Supports Trip Coil Monitoring (TCM) to ensure reliable circuit breaker operation.
• Self-Diagnosis Function:
  Real-time monitoring of CPU, memory, I/O, and other hardware status, with automatic blocking and alarm in case of faults.

5. Environmental Adaptability and Reliability

• Wide Temperature Range: -40°C ~ +85°C, adapting to extreme temperature environments.
• Protection Level: Front panel IP54 (dust/waterproof), rear panel IP20.
• Anti-Interference Capability: Complies with IEC 61000-4-x standards to resist electromagnetic interference, static electricity, and fast transients.

Typical Application Scenarios

Medium and Low Voltage Distribution Systems:

• Protects feeders, transformers, motors, etc., and quickly isolates faults.
• Serves as backup protection for busbars and transmission lines to improve power supply reliability.

Distributed Energy Grid Connection:

• Monitors new energy access points such as photovoltaics and wind power, supporting islanding detection and rapid disconnection.
• Frequency protection ensures equipment safety during grid frequency fluctuations.

Industrial Automation:

• Integrates with PLC and DCS systems to achieve power monitoring and equipment interlock control.
• Protects key motor equipment against overload, short circuit, and ground faults.

Municipal Infrastructure:

• Power protection for airports, ports, and data centers to ensure uninterrupted power supply.
• Feeder protection for streetlights and traffic signals to reduce power outage impacts.

Technical Parameters Overview

Conclusion