GE Multilin 745-W2-P5-G5-HI-A-R-E Transformer Protection System

Description

The GE Multilin 745-W2-P5-G5-HI-A-R-E is a micro-processor based three-winding transformer protection relay designed for the primary protection and management of power transformers. This device provides high-speed differential protection, extensive current, voltage, and frequency monitoring, as well as integrated programmable logic capabilities. Equipped with comprehensive analog inputs/outputs and enhanced communication infrastructure including a 10Base-T Ethernet interface, the GE Multilin 745-W2-P5-G5-HI-A-R-E ensures seamless integration into modern substation automation networks and industrial SCADA systems. It supports complex transformer configurations with automated restraint and zero-sequence component removal.

Features

• Three-winding transformer differential protection capability
• High-speed dual-slope percentage differential protection with harmonic restraint
• Enhanced communication interface supporting 10Base-T Ethernet, RS485, and RS422
• Integrated analog I/O expansion package featuring 4 analog inputs and 8 analog outputs
• Advanced programmable logic using FlexLogic for custom control schemes
• Enhanced user interface with a 40-character vacuum fluorescent display and 22 status LEDs
• Comprehensive event recording, oscillography, and data logging functions

Applications

• Primary and backup protection of three-winding power transformers
• Substation automation and industrial power distribution monitoring
• Harmonic analysis and transformer winding temperature emulation
• Utility intertie protection and control schemes

Ordering Information

• Base Model: 745 (Transformer Protection System)
• Winding Setup: W2 (Three-Wound Transformer)
• Phase Current Input: P5 (5 A)
• Ground Current Input: G5 (5 A)
• Control Power: HI (90 to 300 VDC / 70 to 265 VAC @ 45 to 66 Hz)
• Analog I/O: A (4 Analog Inputs / 8 Analog Outputs)
• Communications: R (Enhanced Comm: Rear RS485 / Rear RS422 / Front RS232 & 10Base-T Ethernet)
• Display: E (Enhanced Display: 40-character LCD, 22 LEDs)

Technical Specifications

Installation Guidelines

• Panel Mounting: Mount the unit firmly into a standard cutout on a switchgear panel to minimize mechanical stress and vibration.
• Grounding: Establish a dedicated low-impedance ground connection to the rear terminal ground busbar to mitigate EMI/RFI interference.
• Current Transformer Connections: Ensure correct polarity alignment on all phase and ground CT inputs prior to energization.
• Thermal Management: Leave sufficient clearance around the cooling vents at the rear of the unit to ensure natural convective ventilation.

Compliance and Certifications

• UL listed (USA and Canada)
• ISO9001:2000 Quality Management System