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GE CR306G0 protective relay
GE CR306G0
GE CR306G0 is a feeder protection relay in the General Electric (GE) Multilin CR300 Series, specifically designed for medium and low-voltage power distribution systems (with a rated voltage up to 15kV). It provides functions such as overcurrent protection, ground fault protection, and voltage protection. This relay is suitable for protecting incoming lines, outgoing lines, bus sections, and transformer circuits in industrial, commercial, and utility sectors, ensuring the safe, reliable, and efficient operation of power distribution systems.
Product Parameters
- Product Model: CR306G0
- Manufacturer: General Electric (GE)
- Product Type: Feeder Protection Relay
- Rated Voltage: 100-240V AC/DC (power supply)
- Rated Current: 1A or 5A (CT secondary side, configurable)
- Protection Functions: Overcurrent (instantaneous/time-delay/inverse time-delay), directional overcurrent, ground fault, voltage protection
- Measurement Accuracy: ±0.5% (current, voltage)
- Communication Protocols: Modbus RTU/TCP, DNP3.0
- Input/Output: 8× digital inputs, 6× relay outputs
- Operating Temperature Range: -25°C to +55°C (-13°F to +131°F)
- Protection Class: IP40 (panel mounting)
- Installation Method: DIN Rail or panel mounting
- Certification Standards: IEC 60255, IEEE C37.90, UL 508
Structure and Composition
CR306G0 adopts a compact modular design, with main components including:
Signal Acquisition Unit
It is equipped with high-precision CT/PT interfaces, supporting 1A/5A CT input and 0-300V AC voltage measurement.
DSP Processing Module
This module performs real-time calculations of effective values of current/voltage, power, electrical energy, and harmonics.
Protection Logic Unit
It supports programmable protection curves (such as IEC inverse time-delay curves and ANSI curves).
Communication Interface
The interface includes dual RS-485 (Modbus RTU) and Ethernet (Modbus TCP).
Human-Machine Interface (HMI)
It features a 320×240 graphic LCD, supporting multi-language display and curve visualization.
Status Indicators
LED lights are used to display operating status, alarms, and faults.
Key Features and Advantages
1. Comprehensive Protection Functions
- Directional overcurrent protection is suitable for ring network systems to avoid maloperation.
- High-sensitivity ground fault detection (0.5-1000A), supporting direct/resistive grounding systems.
2. Advanced Monitoring and Metering
- Real-time monitoring of current, voltage, power, electrical energy, and power factor.
- Fault recording (≥128 cycles), supporting the COMTRADE format.
3. Flexible Communication Integration
- Modbus TCP enables seamless access to SCADA/DCS systems.
- DNP3.0 is supported for wide-area network (WAN) communication.
4. Industrial-Grade Reliability
- Wide operating temperature range of -25°C to +55°C, with vibration resistance of 3g @ 100Hz.
- Built-in self-test function to monitor hardware health status in real time.
Installation and Maintenance
Installation Key Points
- For CT secondary wires, shielded wires with a cross-sectional area of ≥2.5mm² must be used to avoid induced voltage interference.
- Communication cables (e.g., Ethernet cables) and power cables should be laid in separate layers, with a spacing of ≥30cm.
Maintenance Recommendations
- Conduct protection setting verification once a year (using a relay protection tester).
- Regularly back up configuration parameters (via EnerVista software).
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