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GE PH402G-E-2-E
Product Overview
The GE PH402G-E-2-E is a digital motor protection relay from GE’s Multilin™ series, specifically designed for medium and high-voltage motors (3kV-15kV). It provides comprehensive electrical protection and performance monitoring capabilities, leveraging advanced microprocessor technology to integrate multiple protection functions such as thermal model protection, differential protection, and voltage protection. This makes it ideal for critical motor protection in industries including petrochemicals, power generation, and mining.
The PH402G-E-2-E supports various communication protocols such as Modbus, Profibus-DP, and Ethernet/IP. It can be configured and monitored via GE EnerVista™ software, enabling intelligent motor management. Its compact modular design and high protection rating (IP52) allow it to operate reliably in harsh industrial environments.
Product Parameters
- Product Model: PH402G-E-2-E
- Manufacturer: GE Grid Solutions (Multilin™ series)
- Product Type: Digital motor protection relay
- Rated Voltage: 3kV – 15kV (adaptable via external PT/CT)
- Current Input: 1A / 5A (CT secondary side)
- Protection Functions: Overload, short circuit, ground fault, imbalance, locked rotor, under-voltage/over-voltage
- Communication Interfaces: RS-485 (Modbus RTU), Ethernet (Ethernet/IP), Profibus-DP (optional)
- Operating Temperature: -20°C ~ +60°C
- Protection Rating: IP52 (front panel)
- Mounting Type: Panel or DIN rail mounting
- Display: 128×64 pixel LCD with backlight
- Certification Standards: IEC 60255, UL 508, CE
Structure and Composition
The PH402G-E-2-E consists of the following core components:
Signal Acquisition Layer
- High-precision CT/PT input circuits, supporting 1A/5A current and 100V/110V voltage inputs.
- 24-bit ADC for high-resolution signal sampling.
Processing and Protection Layer
- 32-bit microprocessor running real-time protection algorithms (e.g., I²t thermal model).
- Independent hardware protection circuit (ensuring rapid action during faults).
Communication and Display Layer
- Front-panel LCD display and navigation buttons for local operation.
- Dual communication ports (RS-485 + Ethernet) for remote monitoring.
Key Features and Advantages
Comprehensive Motor Protection
- Integrated thermal overload protection (compliant with IEEE 620/IEC 60255 standards).
- Optional differential protection for detecting winding faults in high-voltage motors.
Advanced Monitoring Capabilities
- Real-time display of parameters such as current, voltage, power, and temperature.
- Records fault waveforms (in COMTRADE format) for post-event analysis.
Flexible Communication Integration
- Supports Modbus RTU/TCP, Profibus-DP, and Ethernet/IP.
- Seamless integration with GE EnerVista™ software for centralized management.
High-Reliability Design
- Industrial-grade components with an MTBF of > 300,000 hours.
- Certified to IEC 60255 and UL 508 standards.
Application Fields
- Petrochemical Industry: Protection against overload and short circuits for compressors and pump units.
- Power Industry: Differential protection for boiler feed pumps and induced draft fans.
- Mining and Metallurgy: Protection against imbalance and locked rotor for crushers and conveyor motors.
Installation and Maintenance
Pre-Installation Preparation
- Ensure correct wiring of CT/PT secondary sides (to avoid open/short circuits).
- Use an insulation tester to check the grounding of communication cable shields.
Maintenance Recommendations
- Inspect relay alarm records and event logs every 6 months.
- Calibrate current/voltage measurement accuracy annually (using an OMICRON CMC tester is recommended).
- Regularly update firmware via EnerVista™ software.
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