Description
1. Overview
The GE Multilin SR745-W2-P1-G1-HI-A-L-R is a high-performance digital transformer management and protection relay developed by GE Vernova. Designed for dual-winding power transformers in power substations and industrial distribution systems, it integrates full-set transformer protection, electrical measurement, fault recording, event logging and network communication functions.
Adopting industrial high-precision sampling and embedded computing architecture, the device supports differential protection, overcurrent/overvoltage/undervoltage/frequency protection and zero-sequence protection. With multi-protocol communication compatibility and excellent EMC performance, it realizes all-weather status monitoring and intelligent protection of transformers, widely used in power grid, energy, heavy industry and rail transit power systems.
2. Technical Features
2.1 Full-Set Professional Transformer Protection Logic
Integrates percentage differential protection, instantaneous differential protection, definite/inverse time overcurrent protection, over/under voltage and frequency protection, zero-sequence grounding protection and overload protection. It accurately identifies internal short circuit, inter-turn fault, overload and grid abnormal conditions, realizing high-speed tripping and locking to protect transformer equipment and power grid safety.
2.2 High-Precision Electrical Measurement
Equipped with high-precision AD sampling unit to collect three-phase current, voltage, power, power factor, frequency and energy parameters in real time. It meets power industry measurement standards and supports load trend monitoring and operating status statistics for full visualized transformer management.
2.3 Complete Fault Recording & Traceability
Built-in fault waveform recording and SOE event sequence recording functions, automatically capturing fault waveforms, recording fault time, type, setting values and switch status changes. Mass historical data storage supports fault analysis, accident traceability and protection setting optimization.
2.4 Multi-Protocol Power Communication
Natively supports Modbus, DNP3 and IEC 61850 protocols, seamlessly connecting with substation SCADA and automatic monitoring systems. It realizes remote parameter configuration, telemetry/tele-signal uploading and remote equipment management for unattended power system operation.
3.5 Industrial Rugged & High Reliability Design
Passed strict temperature cycling, vibration shock and EMC tests, featuring strong anti-interference, temperature resistance and aging resistance. It supports 24/7 uninterrupted operation in complex substation and industrial power working conditions with low failure rate and long service life.
2.6 Local Visual Human-Machine Interaction
Equipped with LCD screen and physical keys for local parameter viewing, protection configuration, fault query and self-check. Simple and intuitive operation reduces on-site commissioning and maintenance workload.
2.7 Customizable Programmable Logic
Supports user-defined logic programming, switch linkage and protection locking configuration, adapting to different dual-winding transformer parameters and working conditions, realizing flexible and customized protection strategies for system upgrading and renovation.
3. Detailed Specifications
3.1 Basic Hardware Parameters
- Model: SR745-W2-P1-G1-HI-A-L-R
- Manufacturer: GE Multilin / GE Vernova
- Device Type: Dual-Winding Transformer Integrated Protection & Management Relay
- CT Input Rating: 1A Secondary Current
- Power Supply: High-Voltage AC
- Configuration: LCD Operation Panel, Standard Analog Output, Full Protection & Measurement Logic
- Core Functions: Transformer Differential Protection, Fault Protection, Electrical Measurement, Fault Recording, Power System Communication
- Applications: Substation Transformer Protection, Industrial Distribution Power Management, Power System Automation Upgrade, Legacy Protection Device Replacement
3.2 I/O Electrical Parameters
- Current Input: Rated 1A, High Precision Sampling, Strong Overload Resistance
- Voltage Input: Standard PT 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 Circuit Breaker Status Collection
- Digital Output: Multi-Channel Relay Trip & Alarm Output
3.3 Protection Functions
- Differential Protection: Percentage Bias Differential & Instantaneous Differential Protection
- Current Protection: Inverse/Definite Time Overcurrent, Instantaneous Overcurrent, Zero-Sequence Ground Protection
- Voltage Protection: Overvoltage, Undervoltage & Voltage Unbalance Protection
- Frequency Protection: Overfrequency & Underfrequency Protection
- Auxiliary Protection: Overload, Overheat Protection & Switch Status Locking Logic
3.4 Communication & Data Functions
- Protocols: Modbus, DNP3, IEC 61850
- Interface: Industrial Ethernet / Serial Communication
- Data Functions: Real-Time Telemetry & Tele-signal, Remote Parameter Setting, SOE Event Recording, Fault Waveform Storage
- Software: GE EnerVista Configuration & Debug Software Support
3.5 Mechanical & Installation Parameters
- Structure: Standard Power Cabinet Embedded Chassis
- Installation: Embedded Fixed Installation for Standard High-Voltage Cabinet
- 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: Vibration-Proof, Impact-Proof, High EMC Resistance, Aging Resistance
4. Operating Principle
The SR745 transformer protection relay operates based on high-precision electrical sampling, differential protection algorithm, multi-logic fault judgment, automatic trip alarm and remote data transmission. After power-on initialization, the device continuously collects real-time operating data such as transformer current, voltage, frequency and switch status for high-precision calculation and status judgment.
Aiming at dual-winding transformer operating characteristics, the percentage differential algorithm automatically offsets normal operation deviations such as excitation inrush current and load unbalance, accurately identifying internal winding faults. Combined with overcurrent, voltage, frequency and zero-sequence auxiliary protection, it forms a multi-level fault protection system. When parameter over-limit or equipment fault is detected, the device triggers alarm and tripping action immediately to cut off faulty circuits and prevent transformer damage and grid fault expansion.
The device synchronously records operating events, fault waveforms and action logs, and uploads data to the background monitoring system through power communication protocols, realizing remote monitoring, fault traceability and intelligent management of transformer equipment.
