GE Multilin 845-E-P1-H1-G1-H-N-N-AA-T-M-S-P-F-B-3E-T-W-B-4 Transformer Protection Relay

Product Description

845 is GE Vernova Multilin 8-Series transformer protection & control system, the full ordering code 845-E-P1-H1-G1-H-N-N-AA-T-M-S-P-F-B-3E-T-W-B-4 defines a custom configured unit for power & distribution transformers. This relay integrates differential protection, fault monitoring, metering, programmable logic and asset health diagnosis. It supports two-winding / three-winding transformers, equipped with color graphic display, annunciator alarm panel, rich I/O and high-speed communication interfaces. Conformal coated PCB is optional for harsh substation environments. This model supports IEC 61850, PRP redundant Ethernet, Modbus TCP and DNP3 protocols, widely used in utility substations and large industrial power plants.

Key Functions

• Percent differential protection (87T) with 2nd/5th harmonic restraint for transformer inrush blocking
• Full suite overcurrent, earth fault, overvoltage, undervoltage, overexcitation protection elements
• Up to 13 RTD temperature inputs for winding and oil temperature monitoring
• Breaker control, tap changer LTC monitoring and control function
• Oscillography, event records, fault report and power metering (kW, kVar, kWh)
• Programmable logic, customizable one-line diagram on color screen, 36-point annunciator panel
• Advanced communication: IEC61850 Ed2, PRP, Modbus TCP/RTU, DNP3.0
• Optional DGA interface for transformer dissolved gas analysis and asset condition monitoring

Application Scenarios

• Substation power transformer primary & backup protection
• Industrial large distribution transformers in chemical, mining, oil & gas plants
• Wind farm and solar station step-up transformer protection cabinet
• Power plant auxiliary transformer monitoring and control system
• New substation retrofits replacing legacy GE 745 transformer relays

FAQ

Q1: What series does 845 belong to?
A1: GE Multilin 8 Series, dedicated transformer protection relay platform, alongside 850 feeder, 869 motor, 889 generator relays.

Q2: What does 87T protection do?
A2: Transformer differential protection, the main protection to detect internal winding short circuit faults.

Q3: Can it communicate with SCADA system?
A3: Yes, supports IEC61850, DNP3 and Modbus TCP for SCADA integration.

Q4: Is this model available as new spare?
A4: GE Vernova still accepts new build orders with full configuration code, refurbished units also available for replacement projects.