This model comes in a standard configuration, featuring 5A three-phase current inputs, a graphical control panel, Wi-Fi communication, advanced cybersecurity and other full-function capabilities.It is well suited for harsh industrial environments and modern smart grid architectures.

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Multilin 889 Advanced Generator Protection.pdf

Technical Specifications

1. Electrical Parameters

• Power Supply: 110–230 VAC / 110–250 VDC
• Current Inputs: Standard 1A/5A CT inputs
• Voltage Inputs: 10–260 V, frequency range 20–65 Hz
• Frequency Tracking: 3–72 Hz (suitable for VFD-driven motors)
• Operating Temperature: -40℃ ～ +60℃
• RTD Temperature Range: -40℃ ～ +250℃
• Ingress Protection: Front panel IP54
• Manufacturing Standard: IPC A-610-E Class 3, electrolytic capacitor-free design

2. Model Code Interpretation (869EP5NN0BHRRANNMMPFESENNBN)

• 869: Product series (dedicated motor protection)
• EP5: Advanced protection and control package
• NN0: Standard I/O and communication base configuration
• B: Front panel type (color graphical HMI)
• HRR: Hardware interface and extension module configuration
• ANN: Synchronous motor protection functions enabled
• MMP: Advanced motor monitoring and diagnostics
• FES: Arc flash protection and fault recording
• ENN: Network communication and security configuration
• BN: Customized hardware and software version

3. Core Protection Functions

3.1 Comprehensive Motor Electrical Protection

• Overcurrent / Earth Fault: 50/51 (instantaneous / time-overcurrent), 50G/51G (earth fault), 50SG (sensitive earth fault), 50N/51N (neutral overcurrent)
• Voltage / Frequency Protection: 27P/59P (undervoltage / overvoltage), 81O/81U (overfrequency / underfrequency), 81R (rate of change of frequency), 24 (volts per hertz)
• Unbalance / Negative Sequence: 46 (current unbalance), 50_2/59_2 (negative-sequence overcurrent / overvoltage)
• Starting / Locked Rotor: 48 (start time supervision), 50LR (mechanical jam / locked rotor), 66 (maximum start limit)
• Synchronous Motor Dedicated: 40/41 (loss of field), 78 (out-of-step), 26F/27F/37F/59F (excitation temperature / voltage / current protection), 95 (synchronization / resynchronization)

3.2 Advanced Thermal Protection Model

• Speed-Biased Thermal Model: Based on time-speed curves, suitable for high-inertia loads and reduced-voltage starting
• Independent Stator / Rotor Thermal Protection: Separates thermal accumulation in cage rotors and stator windings for accurate overheating warning
• TCU (Thermal Capacity Utilization): Real-time monitoring and warning of motor thermal stress to prevent insulation aging and burnout
• VFD Harmonic Thermal Compensation: Automatically calculates additional heat generated by VFD harmonics for improved thermal protection accuracy

3.3 Arc Flash Protection (AFP)

• Integrated optical sensor + overcurrent dual criteria, detects arc flash faults in switchgear / MCC within 2 ms
• Fast tripping reduces incident energy, minimizing equipment damage and personnel risk
• Supports 4 arc flash sensors with self-diagnostics and status indication

4. Monitoring & Diagnostics

4.1 Motor Health Diagnostics (MCSA/ESA)

• Patented Motor Current Signature Analysis (MCSA) detects the following without additional sensors:
• Stator inter-turn short circuits, broken rotor bars
• Bearing faults, foundation looseness, air-gap eccentricity, shaft misalignment
• Abnormal mechanical loads and early fault warnings
• Generates motor health reports with trend analysis for predictive maintenance

4.2 Environmental & Status Monitoring

• Patented environmental monitoring system for real-time monitoring of the relay’s operating conditions (temperature, humidity, etc.)
• RTD Temperature Monitoring: Multi-point temperature acquisition for stator, bearings, field windings (38/49S/26F)
• Fault Recording & Event Logging: High-speed fault waveform capture, supports SOE (Sequence of Events) and fault playback

5. Control & Programmable Logic

5.1 Local Control & HMI

• Full-color graphical control panel (GCP) supporting custom single-line diagrams (SLD), up to 6 pages, capable of controlling 3 circuit breakers + 9 disconnectors
• Front panel: 10 programmable keys + 12 programmable LEDs (or 3 keys + 12 LEDs) for intuitive status and alarm indication
• Draw-out design: facilitates testing, maintenance and replacement, improving system uptime

5.2 FlexLogic Programmable Logic

• Highly customizable logic engine for complex control logic (starting sequences, interlocks, automatic load/unload, resynchronization, etc.)
• Supports automatic resynchronization of synchronous motors, excitation system control, and reduced-voltage starting logic configuration

6. Communication & Network Integration

6.1 Communication Protocols

• Ethernet: Dual independent Ethernet ports supporting IEC 61850 Ed2, IEC 62439/PRP, Modbus TCP, DNP3.0, IEC 60870-5-104
• Serial: Modbus RTU, IEC 60870-5-103
• Local Interface: Front USB, optional Wi-Fi (WPA-2 security), supporting remote configuration and diagnostics

6.2 Cybersecurity

• Supports AAA (RADIUS/LDAP), RBAC (role-based access control, up to 5 roles and 8 users), Syslog event auditing
• Complies with industrial cybersecurity standards such as NERC CIP

7. Typical Applications

• Medium and large induction / synchronous motors: main and auxiliary motor protection in oil & gas, mining, cement, wastewater treatment and power industries
• Special-load motors: high-inertia loads, two-speed motors, VFD-driven motors, cyclic-load motors
• Synchronous motor applications: excitation system control, loss-of-field / out-of-step protection, full-dimensional stator and rotor protection
• System upgrade & retrofit: rapid replacement of SR 469 relays without rewiring or drawing modifications, upgrade completed in as fast as 21 minutes