Description

GE  760-P1-S5-HI-A5-G-T 760  Series Digital Feeder Protection Relay

1. Protection Function Parameters

Overcurrent Protection

• Time Overcurrent (TOC):
  • Curve Types: IEC standard curves (51), ANSI standard curves (e.g., Inverse, Very Inverse, Extremely Inverse)
  • Current Range: 0.1~20In (In = rated current)
  • Time Setting: 0.05~100s
  • Curve Multiplier: 0.5~10
• Instantaneous Overcurrent (IOC):
  • Current Range: 0.2~20In
  • Time Delay: 0~10s

Ground Fault Protection

• Sensitive Ground (50N/51N):
  • Current Range: 0.05~20In
  • Directionality: Optional (based on zero-sequence voltage/current phase relationship)
• Restricted Ground (50GR/51GR):
  • For transformer neutral grounding protection
  • Accuracy: ±1%

Voltage Protection

• Overvoltage/Undervoltage (59/27):
  • Voltage Range: 0.1~1.2Un (Un = rated voltage)
  • Time Setting: 0.05~100s
• Negative Sequence Voltage (47):
  • Detects system imbalance, range: 0.5%~20% Un
• Zero Sequence Voltage (59N/27N):
  • Detects ground faults, range: 0.1~50V

Frequency Protection

• Overfrequency/Underfrequency (81O/81U):
  • Frequency Range: 45~55Hz (adjustable)
  • Time Setting: 0.05~100s
  • Slip Rate (df/dt) Detection: 0.1~10Hz/s

2. Measurement and Metering Parameters

• Current Measurement:
  • Range: 0~20In
  • Accuracy: ±0.5%
• Voltage Measurement:
  • Range: 0~1.2Un
  • Accuracy: ±0.5%
• Power Measurement:
  • Active/reactive/apparent power
  • Accuracy: ±0.5%
• Energy Metering:
  • Bidirectional accumulation (import/export)
  • Resolution: 0.001kWh

3. Communication Interface Parameters

• Serial Ports:
  • RS232 (front panel): Baud rate 300~19200bps
  • RS485/RS422 (rear panel ×2): Baud rate 300~19200bps
• Ethernet Port:
  • 10/100Mbps auto-negotiation
  • Supports ModBus TCP/IP, DNP3.0 network protocols
• Protocol Support:
  • ModBus RTU/TCP
  • DNP3.0 Level 2
  • IEC 60870-5-103 (optional)
• Concurrent Connections: ≥4

4. Operating Environment Parameters

• Temperature Range:
  • Operating temperature: -40°C~+85°C
  • Storage temperature: -40°C~+85°C
• Humidity Range:
  • Relative humidity: 5%~95% (non-condensing)
• Altitude:
  • Max 2000m (standard); derating required for >2000m
• Electromagnetic Compatibility:
  • Complies with IEC 61000-4-x standards (radiation, ESD, fast transients, etc.)

5. Physical Parameters

• Dimensions:
  • Height × Width × Depth: ~220×177×150mm
• Weight:
  • ~3.5kg
• Mounting Methods:
  • Panel mounting or rail mounting
• Enclosure Protection:
  • Front panel: IP54
  • Rear panel: IP20

6. Power Supply Parameters

• Operating Power:
  • Optional AC/DC 100~250V or DC 24~48V
• Power Consumption: <15VA (standby), <25VA (operating)

7. Output Interface Parameters

• Relay Outputs:
  • Programmable relays: ≥8 (NO + NC optional)
  • Contact rating: 5A @ 250VAC/30VDC
• Analog Outputs:
  • 4~20mA (optional, for remote monitoring)
  • Accuracy: ±0.5%

8. Other Features

• Event Recording:
  • Stores ≥1000 event records
  • Timestamp accuracy: ≤1ms
• Waveform Capture:
  • 2~8 cycles before and after fault
  • Sampling rate: 64 points/cycle
• Self-Diagnosis:
  • Real-time monitoring of CPU, memory, I/O, and other hardware status
  • Automatic blocking and alarm in case of faults

Typical Application Scenarios

• Medium and low voltage distribution systems: Protects feeders, transformers, motors, etc.
• Distributed energy grid connection: Protection for new energy access such as photovoltaics and wind power
• Industrial automation: Integrates with PLC and SCADA systems for power monitoring
• Municipal infrastructure: Power protection for airports, ports, data centers, etc.