Digital guide
You are here:
GE 735-5-5-HI-485
Product Overview & Core Function
This relay provides specialized protection against phase and ground overcurrent conditions. It is designed for integration into substation switchgear and industrial power systems, ensuring high-speed fault detection and reliable trip execution. The “HI” suffix denotes a high-voltage power supply that maintains stable operation across a broad range of station battery voltages and auxiliary AC sources. The “5-5” designation signifies compatibility with 5 A phase and 5 A ground CT secondary inputs.
Detailed content
Technical Specifications
- Manufacturer: GE Multilin (General Electric) / GE Fanuc
- Series: 735 Feeder Protection Relay
- Protection Functions: Phase Overcurrent (50/51), Ground Overcurrent (50G/51G)
- Phase CT Secondary: 5 A nominal
- Ground CT Secondary: 5 A nominal
- Power Supply (HI Range): 90–300 VDC or 70–265 VAC (48–62 Hz)
- Communication Interface: RS485 2-wire serial port
- Supported Protocols: Modbus RTU, GE Proprietary
- Baud Rate: Programmable up to 19.2 kbps
- Output Contacts: Multiple programmable Form-C contacts
- Contact Rating: 10 A at 250 VAC / 30 VDC (resistive)
- Measurement: True RMS current sensing
- Metering Parameters: Phase Current, Ground Current, Peak Demand
- Event Recording: Detailed sequence-of-events and fault reporting
- Operating Temperature: –40 to +70 °C (–40 to +158 °F)
- Frequency: 50/60 Hz auto-sensing
- Form Factor: Draw-out or fixed-mount relay housing
- Dimensions: Standard 735 Series panel-mount footprint
- Weight: 5.35 kg (11.79 lbs)
- Status: Discontinued by manufacturer; available as refurbished or surplus
Functional Features
- Instantaneous and time-delayed overcurrent protection
- Ground fault detection
- Microprocessor-based design for precise measurement and configurable settings
- RS485 communication for SCADA integration and remote monitoring
Application Scenarios
Commonly deployed in utility substations, large industrial power distribution systems, retrofitted switchgear requiring RS485 SCADA integration, and facilities with varying DC battery or AC auxiliary power sources.
Installation & Usage Notes
- Install in accordance with applicable electrical codes and standards.
- Verify CT secondary connections: 5 A phase and 5 A ground.
- Configure Modbus RTU parameters to match the SCADA network.
- CT secondary must never be opened under load.
- Ensure proper torque on terminal connections for the HI range power supply.
