GE 745-W2-P5-G5 | Transformer Relay for Small to Large Transformers

Product Description

The GE Multilin 745-W2-P5-G5-LO-A-L-R-E is a comprehensive transformer protection relay, suitable for small, medium, and large power transformers. It provides precise protection for two-winding and three-winding transformers, utilizing multiple current and voltage inputs to ensure both primary and backup protection. Moreover, the relay safeguards against differential faults, restricted earth faults, overcurrent, over-fluxing, and issues related to on-load tap changers. In addition, the withdrawable case design with modular hardware simplifies installation and maintenance, while flexible I/O and advanced communication protocols, including IEC 61850, Modbus, and DNP3, ensure seamless system integration. The 745 series also delivers real-time monitoring and event recording, providing operators with critical insights to maintain reliable transformer operation.

Technical Specifications

Protection Functions

• Differential protection (two-winding)

• Restricted earth fault

• Phase and ground overcurrent

• Breaker failure protection

• Over/under voltage and frequency

• Over-fluxing and on-load tap changer monitoring

Inputs

• CT inputs (5 A rated)

• VT inputs for voltage monitoring

Control Functions

• Breaker control

• Interlocking

• Synchronism check

Monitoring & Event Recording

• Oscillography

• Disturbance analysis

• Transformer thermal monitoring

Metering

• Current, voltage, frequency, demand

• Power, energy, harmonic distortion

Communication Protocols

• IEC 61850, Modbus, DNP3, RS485

• Ethernet TCP/IP

User Interface

• Front panel LCD display with keypad and programmable LEDs

Power Supply

• 24–250 VDC / 48–240 VAC universal range

Operating & Storage Temperature

• –40 °C to +70 °C (operation)

• –40 °C to +85 °C (storage)

Mounting & Certifications

• Standard SR series withdrawable case

• IEC, ANSI, CE, UL compliance

FAQ

Q: What transformers can the 745 relay protect?
It protects small, medium, and large two-winding and three-winding power transformers.

Q: Which communication protocols does it support?
IEC 61850, Modbus, DNP3, RS485, and Ethernet TCP/IP are supported for integration.

Q: Does it provide both primary and backup protection?
Yes, it provides primary differential protection and backup overcurrent, over-fluxing, and tap changer monitoring.

Q: What is the operating temperature range?
The relay operates from –40 °C to +70 °C and can be stored up to +85 °C.

Q: What kind of event recording does it offer?
It offers oscillography, disturbance analysis, and transformer thermal monitoring for detailed fault diagnostics.