Description
1. Overview
The GE Multilin SR745-W2-P1-G1-HI-A-L-R-E is an enhanced digital dual-winding transformer protection and management relay launched by GE Vernova. As the upgraded version of the standard SR745 series, it adopts enhanced computing core and optimized protection algorithms, with expanded data storage and redundant communication functions.
Integrating full-set transformer protection, high-precision electrical measurement, large-capacity fault recording and refined event logging, the device features stronger fault identification capability and better adaptability to complex power grid conditions. It is widely used in intelligent substations, industrial high-voltage distribution systems and unattended power management scenarios, serving as a high-reliability core device for transformer safety protection and intelligent monitoring.
2. Technical Features
2.1 Enhanced Full-Set Transformer Protection Logic
Optimized differential protection algorithm effectively avoids malfunction caused by transformer inrush current and load fluctuation. It supports percentage bias differential, instantaneous differential, inverse/definite time overcurrent, over/under voltage & frequency, zero-sequence grounding and overload protection. It realizes millisecond-level accurate tripping for internal short circuit, inter-turn fault and other abnormal conditions, ensuring transformer operation safety.
2.2 High-Precision Sampling & Power Measurement
Equipped with upgraded high-speed AD sampling chip and optimized digital filtering algorithm, the device accurately collects three-phase electrical parameters and energy data. It supports load trend tracking and power quality preliminary analysis, realizing refined full-condition monitoring of transformers.
2.3 Large-Capacity Fault Recording & Traceability
Expanded local storage supports high-density and long-duration fault waveform recording, completely recording the whole process of fault occurrence and removal. Optimized SOE event logging records operation events and fault information with millisecond accuracy, providing comprehensive data support for power accident analysis and setting optimization.
2.4 Redundant Multi-Protocol Communication
Natively supports Modbus, DNP3 and IEC 61850 protocols. The enhanced firmware optimizes communication reconnection and error tolerance logic, supporting dual-link redundant networking to avoid data loss and intermittent disconnection. It realizes stable remote parameter configuration, data uploading and equipment management for intelligent power system networking.
2.5 Upgraded Industrial Rugged Design
Adopts upgraded three-proof PCB and high-reliability components, with enhanced EMC anti-interference, temperature resistance and aging resistance. It stably supports 24/7 uninterrupted operation in harsh industrial and substation environments with lower failure rate and longer service life.
2.6 Efficient Local & Remote O&M
Optimized local LCD menu simplifies parameter configuration and fault query. Compatible with GE EnerVista software, it supports batch parameter management, remote firmware upgrade and one-click fault data export, greatly improving on-site commissioning and maintenance efficiency.
2.7 Expandable Programmable Logic
Opens richer programmable logic resources, supporting customized multi-condition interlock protection and linkage control strategies. It adapts to various dual-winding transformer parameters and complex power distribution system operation modes, meeting personalized on-site control requirements.
3. Detailed Specifications
3.1 Basic Hardware Parameters
- Model: SR745-W2-P1-G1-HI-A-L-R-E
- Manufacturer: GE Multilin / GE Vernova
- Device Type: Enhanced Dual-Winding Transformer Integrated Protection & Management Relay
- CT Input Rating: 1A Secondary Current
- Power Supply: High-Voltage AC
- Key Configuration: Enhanced Computing Core, Expanded Storage, Redundant Communication, LCD Local Operation
- Core Functions: Full Transformer Protection, High-Precision Measurement, Large-Capacity Fault Recording, Intelligent Network Communication, Programmable Logic Control
- Applications: Intelligent Substation Protection, Industrial High-Voltage Distribution, Unattended Power System, Legacy Equipment Upgrade
3.2 I/O Electrical Parameters
- Current Input: Rated 1A, Enhanced Filtering, Stable Anti-Interference Sampling
- Voltage Input: Standard PT Secondary Voltage Input for Power System Monitoring
- Analog Output: 0～1mA / 4～20mA Standard Industrial Signal
- Analog Output Load: 10kΩ (0～1mA); 600Ω (4～20mA)
- Digital Input: Multi-Channel Passive Input for Switch Status Collection
- Digital Output: High-Speed Relay Trip & Alarm Output
3.3 Enhanced Protection Functions
- Differential Protection: Optimized Percentage Bias & Instantaneous Differential Protection
- Current Protection: Intelligent Inverse/Definite Time Overcurrent & Zero-Sequence Ground Protection
- Voltage Protection: Overvoltage, Undervoltage & Voltage Unbalance Protection
- Frequency Protection: High-Precision Overfrequency & Underfrequency Protection
- Auxiliary Protection: Intelligent Overload, Overheat Protection & Fault Self-Reset Logic
3.4 Communication & Data Parameters
- Protocols: Modbus, DNP3, IEC 61850 (Enhanced Protocol Stack)
- Interface: Industrial Ethernet + Serial Port, Dual Redundant Link
- Data Functions: Real-Time Telemetry & Tele-Signal, Remote Setting, Millisecond SOE Log, Expanded Fault Recording
- Software Compatibility: GE EnerVista Configuration & Upgrade Software
3.5 Mechanical & Installation Parameters
- Structure: Standard Reinforced Embedded Power Chassis
- Installation: Standard Cabinet Embedded Fixed Installation
- HMI: LCD Display + Physical Operation Keys
- Weight: Approx. 4.8kg
3.6 Environmental Parameters
- Operating Temperature: -40℃ ～ +85℃
- Storage Temperature: -50℃ ～ +90℃
- Operating Humidity: 5%～95%RH (Non-Condensing, Non-Corrosive)
- Environmental Resistance: Enhanced Vibration, Impact & EMC Resistance
4. Operating Principle
The SR745-W2-P1-G1-HI-A-L-R-E enhanced relay operates based on high-precision enhanced sampling, optimized differential algorithm, intelligent multi-dimensional fault judgment and redundant data transmission. After power-on initialization, the high-speed core continuously collects and calculates transformer voltage, current, frequency and switch status data through optimized filtering and sampling technology.
The upgraded differential algorithm intelligently eliminates normal interference such as excitation inrush current and load unbalance, accurately identifying internal winding faults. Combined with multi-level auxiliary protection logic, it forms a high-precision and low-misoperation protection system. Once abnormal parameters or equipment faults are detected, the device outputs alarm and tripping signals in milliseconds to cut off faulty circuits and prevent fault expansion.
With expanded storage and dual-link redundant communication, the device completely records fault waveforms and operation logs, and uploads data stably to the background system. The enhanced hardware and algorithm ensure long-term high-precision and high-reliability operation in complex power grid and strong electromagnetic interference environments.
