GE 845-E-P1-H1-G1-H-N-N-AA-T-M-S-P-F-B-3E-T-W-B-4 Transformer comprehensive protection relay

Product Description

GE Multilin 845-E-P1-H1-G1-H-N-N-AA-T-M-S-P-F-B-3E-T-W-B-4 is the GE Vernova Multilin Series 8 Transformer Protection & Management System (Comprehensive Transformer Protection Relay). It delivers full primary & backup protection, control, measurement and asset health monitoring for 2-winding and 3-winding power transformers. Built on dual multi-core processor architecture, it supports differential protection, overcurrent, zero-sequence, thermal protection logic. It can directly interface with DGA dissolved gas analyzers to provide combined electrical & oil-chemistry transformer diagnostic. Equipped with color LCD HMI, programmable logic, fault oscillography, event records and multiple communication protocols. It adopts modular pluggable I/O and panel flush mounting, widely used for main & station service transformers in substations. This ordering code configuration: 1A primary phase current input, 1A secondary winding current input, 1A ground CT input, wide AC/DC universal power supply.

Specifications

• Model: 845-E-P1-H1-G1-H-N-N-AA-T-M-S-P-F-B-3E-T-W-B-4
• Brand: GE Vernova (Former GE Grid Solutions, Multilin)
• Type: Transformer Protection & Management Relay (Series 8 Platform)
• Applicable Transformer: 2-winding / 3-winding MV & HV power transformers
• Current Input Config: P1=1A primary phase current; H1=1A secondary winding current; G1=1A ground CT input
• Power Supply H: 110–250VDC / 110–230VAC wide range universal supply
• Core Protection Functions: 87T transformer differential protection, phase overcurrent, zero-sequence protection, thermal protection, breaker monitoring, breaker failure protection
• Monitoring Functions: Harmonic measurement (up to 25th harmonic + THD), fault oscillography, sequence of event recording, breaker health assessment, integrated DGA dissolved gas monitoring
• Communication Protocols: IEC61850 Ed2, PRP, Modbus TCP/RTU, DNP3, IEC60870-5-104
• HMI: Color LCD display, local keypad operation, front USB service port
• Mounting: Panel flush mount, draw-out pluggable module design
• Operating temperature: -40℃ ~ +85℃
• Key features: Dual-processor architecture, programmable logic, integrated electrical + DGA transformer diagnosis, high-performance differential algorithm, fault waveform recording, modular I/O expansion

Application

1. Primary and backup protection, measurement & management for main power transformers in utility substations
2. Protection for 2/3-winding station service transformers in power plants, petrochemical and metallurgical substations
3. On-line asset health monitoring for MV/HV transformers, interfaced with DGA dissolved gas monitoring equipment
4. Transformer fault oscillography, event logging, breaker condition assessment and lifetime management
5. Smart substation integration with SCADA/EMS for remote measurement, status and protection alarm transmission

Series Models

1. 845: Standard transformer protection relay (base 845 series)
2. 745: Economy transformer differential protection relay
3. T35: Medium & small transformer protection device
4. T60: High-end multi-winding transformer protection system
5. 850: Feeder protection relay (same Series 8 platform)
6. 869: Motor management relay (same Series 8 platform)