Description

GE Multilin 889-E-P1-P1-B1-H-S-S-A-L-A-A-A-P-T-A-SE-T-N-B-4-1 Generator & Transformer Protection Relay

Technical Specifications

• Product Model: 889-E-P1-P1-B1-H-S-S-A-L-A-A-A-P-T-A-SE-T-N-B-4-1
• Brand: GE Multilin (General Electric, now part of Baker Hughes)
• Warranty: One Year
• Input Voltage: 85–264 VAC universal auxiliary power supply
• Operating Temperature: -20°C to +60°C
• Storage Temperature: -40°C to +85°C
• Response Time: ≤8ms high-speed fault trip execution for generator short-circuit protection
• Protection Class: IP20 for panel cutout installation in control rooms
• Accuracy Class: 0.1% full-scale CT/VT electrical measurement precision
• Communication Frequency: Ethernet 10/100Mbps auto-negotiation, serial baud rate up to 115200bps
• Rated Current Range: CT secondary rated 1A / 5A selectable, power consumption ≤15VA
• Communication Interface: Dual Ethernet ports, RS485 serial port, front USB service port, fiber optical option
• Supported Protocols: IEC 61850 Ed2, IEC 62439 PRP redundant network, Modbus TCP/RTU, DNP3, IEC 60870-5-104
• Overload Capacity: 20 times nominal CT current short-term withstand, 2kV isolation between power, measurement and communication circuits
• Dimensions: Standard 6U 19-inch panel mounted housing, 266.7mm (H) × 234.9mm (W) × 220mm (D)
• 

Product Overview

The 889-E-P1-P1-B1-H-S-S-A-L-A-A-A-P-T-A-SE-T-N-B-4-1 is a fully customized factory variant of the GE Multilin 889 advanced multifunctional intelligent electronic device (IED), dedicated to comprehensive protection, control, monitoring and asset management for synchronous generators, small industrial turbines and unit-connected step-up transformers in power plants, cogeneration facilities and heavy industrial self-generation systems. This long string suffix is GE’s full configuration coding to define language, CT rating, input/output layout, HMI type, communication modules, enclosure, terminal style, protocol stack and optional auxiliary functions. It integrates all necessary generator protection algorithms into a single compact panel relay, replacing dozens of discrete electromechanical relays, fault recorders, transducers and sequence controllers.

It addresses critical vulnerabilities of traditional generator protection systems: scattered relay devices leading to complex wiring and high hidden failure risks, slow tripping speed causing severe rotor/stator winding damage, lack of redundant communication leading to DCS monitoring interruption, incomplete disturbance waveform recording for post-fault root cause analysis, insufficient thermal overload modeling for locked rotor and startup overheating, and non-compliance with modern substation IEC 61850 digital communication standards. The embedded high-performance DSP processor executes fully coordinated protection logic including differential protection, loss of excitation, reverse power, over/under voltage, overfrequency/underfrequency, negative sequence unbalance, ground fault and bearing over-temperature tripping.