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GE SR745-W2-P5-G5-HI Transformer Protection Relay

The GE SR745-W2-P5-G5-HI is part of the GE Multilin 745 series of transformer protection relays. Designed specifically to protect and monitor two-winding transformers, this relay provides dual-slope percent differential protection with additional protections such as restricted ground fault and overexcitation blocking. It operates within the architecture of electrical protection and control systems, integrating seamlessly with grid automation and industrial control platforms.

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Description

The GE SR745-W2-P5-G5-HI is a transformer protection system widely used in electrical power distribution and industrial automation sectors for safeguarding power transformers. It is applicable in substations and power plants where protecting transformers from faults such as overloads, short circuits, and ground faults is critical for system reliability and safety. This protection relay is engineered to monitor transformer parameters in real-time and initiate protective measures, thereby minimizing downtime and costly damage in power generation and distribution networks. The GE SR745-W2-P5-G5-HI plays a vital role in industrial automation environments that require precise, fast, and reliable transformer fault detection suitable for small, medium, and large power transformers.

Product Introduction and Positioning

The GE SR745-W2-P5-G5-HI is part of the GE Multilin 745 series of transformer protection relays. Designed specifically to protect and monitor two-winding transformers, this relay provides dual-slope percent differential protection with additional protections such as restricted ground fault and overexcitation blocking. It operates within the architecture of electrical protection and control systems, integrating seamlessly with grid automation and industrial control platforms.

This relay’s value lies in its combination of comprehensive transformer monitoring capabilities and ease of integration. The unit supports a wide range of voltage and current inputs, offers advanced metering and diagnostics, and includes features tailored for protecting transformers from internal and external faults. Engineers and system integrators rely on the GE SR745-W2-P5-G5-HI for its high accuracy and rugged design suited for demanding utility and industrial environments.

Key Technical Features and Functional Benefits

The GE SR745-W2-P5-G5-HI offers high-speed, secure transformer protection with variable dual-slope differential protection curves that compensate for inrush currents and overexcitation. The system includes phase and ground overcurrent protection, advanced frequency and rate-of-change detection, and overload protection based on customizable settings. These features substantially reduce false trips and improve fault discrimination.

SR745-W2-P5-G5-HI
SR745-W2-P5-G5-HI
SR745-W2-P5-G5-HI
SR745-W2-P5-G5-HI

The hardware design incorporates a drawout case for quick maintenance and a conformal coating to withstand harsh environmental conditions, including high humidity and temperature variations. The relay is equipped with analog inputs and outputs for precise measurements, along with a clear liquid crystal display for easy local monitoring.

In addition to its comprehensive protection functionality, the unit supports extensive monitoring, metering, and event recording features like oscillography and harmonic analysis. Communication interfaces include Ethernet, RS232, and RS485 ports supporting standard protocols such as ModBus RTU and DNP 3.0, enabling seamless integration into SCADA and DCS networks, enhancing remote diagnostics and control.

Detailed Technical Specifications

Parameter Value
Model GE SR745-W2-P5-G5-HI
Brand General Electric (GE)
Product Type Transformer Protection Relay
Transformer Windings Two Winding
Current Inputs 5 A nominal
Voltage Inputs 5 V nominal
Frequency 50/60 Hz
Operating Temperature Range -40°C to +60°C
Control Power 70-265 VAC / 90-300 VDC
Display Basic 40-character LCD
Communication Interfaces RS232 front, RS485 rear, Ethernet (optional)
Protection Features Differential, restricted ground fault, overexcitation blocking
Analog I/Os Included
Environmental Rating Conformal coating, indoor use

Related Modules or Compatible Units

SR745-W2-P5-G5-HI-AR – Variant adding restricted ground fault and advanced analog I/O capability.

SR745-W2-P5-G5-HI-A – Enhanced model with Ethernet and extended logic features.

GE Multilin 850 Series – Transformer and feeder protection relay series with expanded functionality.

GE Multilin 285 – Digital relay for feeder protection, complementary in protection schemes.

GE Multilin 750 – Transformer protection relay with enhanced automation and control features.

Installation Notes and Maintenance Best Practices

When installing the GE SR745-W2-P5-G5-HI, ensure the control panel or relay cubicle provides sufficient space for the drawout relay case and adequate ventilation to maintain the operating temperature range. Proper grounding and wiring according to manufacturer specifications are critical to reduce electromagnetic interference influencing measurement accuracy. Verify compatibility with existing transformer voltage and current transformers to ensure correct relay input signals.

Routine maintenance protocols include periodic inspection of relay contacts, cleaning of cooling vents, and functional testing of protection settings using simulation modes offered by the relay software. Event and fault logs should be reviewed regularly to monitor relay performance and identify issues early. Firmware updates and relay calibration are recommended to optimize protection accuracy and system integration, performed by qualified personnel.