889 E-P5-P5-G5-H-S-A-M-F-M-A-P-T-C-1E-C-N-B-N Relay Protection Device

GE Multilin 889 E-P5-P5-G5-H-S-A-M-F-M-A-P-T-C-1E-C-N-B-N is the flagship generator+main transformer integrated protection device of GE 8 series, aimed at large units and grid level applications, integrating main/backup protection, control, waveform recording, and communication.
1、 Full analysis of model code (corresponding to each digit)
889-E-P5-P5-G5-H-S-S-A-M-F-M-A-P-T-C-1E-C-N-B-N
889: Series (Generator+Main Transformer Integrated Protection)
E: Language=English
P5: Phase current 1 (J1)=5A CT three-phase
P5: Phase current 2 (J2)=5A CT three-phase (main transformer side)
G5: Grounding current=5A CT zero sequence/grounding
H: Power supply=90-300VDC/70-265VAC
S: Analog output=4-20mA
S: RTD input=16 RTD (stator/bearing temperature measurement)
A: Communication=Ethernet (10/100Base-T)
M: Display=Large size graphic LCD
F: Firmware=Standard Generator Protection Firmware
M: Mechanical structure=drawer type (pluggable)
A: Auxiliary power supply=standard
P: Protocol=IEC 61850 Ed2+Modbus TCP/RTU
T: Time synchronization=IRIG-B+PTP
C： cybersecurity = AAA/RADIUS/RBAC
1E: Event recording=128 cycles high-speed recording
C: Control=Programmable Logic (FlexLogic)
N: No Wi Fi
B: Environment=Wide temperature range (-40 ℃~+70 ℃)+Three proof coating
N: No other special options available
2、 Core hardware parameters (authoritative specifications)
table
Parameter specifications
Current input 3 × 5A (J1)+3 × 5A (J2)+1 × 5A (grounded)
Voltage input 3 × 120V/69V (software adjustable)
RTD 16 channels (Pt100/Pt1000/Cu100)
Analog output 8 × 4-20mA (isolated)
Digital I/O 16DI/12DO (Form-C, 5A)
Communication Dual Ethernet (PRP/HSR), RS485, USB
Protocol IEC 61850 Ed2, Modbus TCP/RTU, DNP3.0, IEC 60870-5-104
Power supply 90-300VDC/70-265VAC, 48-62Hz
Working temperature -40 ℃~+70 ℃
IP20 protection (inside cabinet), drawer type
Weight approximately 10kg
Brand new 12-month warranty
3、 Core protection function (full coverage of generator and main transformer)
1. Generator main protection
100% stator grounding (91N), differential (87G, ≤ 16ms)
Demagnetization (40), reverse power (32), overexcitation (24)
Overvoltage/undervoltage (59/27), overcurrent (50/51), negative sequence (46)
Abnormal frequency (81U/81O), out of step (78), PT disconnection
2. Main transformer protection (integrated)
Main transformer differential (87T), overcurrent, zero sequence, overexcitation
Generator main transformer overall differential (87O, backup redundancy)
3. Monitoring and advanced features
128 cycle high-speed recording, 1024 events, 15 fault reports
FlexLogic programmable logic, FlexCurve custom curve
10 fixed value groups, thermal model, cooling rate, and imbalance calculation
Simultaneous grid connection (25), voltage/reactive power regulation (AVR interface)
4、 Application scenarios
Large synchronous generator (above 50MVA)+integrated protection of main transformer
Grid power plants, self owned power plants, and combined cycle units
Key units requiring IEC 61850, PRP, and high safety levels