GE Multilin 889 EP5P5G5HNNAANGMSFB3ASNBN is a high-end microprocessor-based generator protection relay in the Multilin 8 Series. Designed for small, medium and large generators as well as unit transformers in industrial and utility applications, it provides an integrated solution featuring primary protection, backup protection, control, real-time monitoring and asset management to ensure safe, reliable and efficient operation of power generation equipment.
Technical Specifications
1. Hardware Configuration (EP5P5G5HNNAANGMSFB3ASNBN Custom Features)
Communication Module
Equipped with an advanced communication package featuring 1310nm ST multi-mode fiber Ethernet ports, supporting IEC 61850 Ed2 extended protocols and dual independent IP addresses. Wireless communication functions are not included.
Protection & Control Module
Standard current protection and voltage monitoring & protection package, integrated with FlexLogic programmable logic, RTD-biased thermal overload, directional power relay, and other functions.
Security & Monitoring Module
Basic security package supporting RBAC (Role-Based Access Control), operating hours monitoring, circuit breaker health reporting, and other functions.
Physical Design
Draw-out construction for convenient testing, commissioning and maintenance; IP54 ingress protection rating suitable for harsh industrial environments; electrolytic capacitor-free design for enhanced reliability; supports field-replaceable power supply module.
Human-Machine Interface
Full-color graphical HMI panel, available with either 10 programmable keys + 12 LEDs or 3 programmable keys + 12 LEDs, providing intuitive display of device status and measured data.
2. Electrical & Performance Parameters
Protection SpeedStator differential protection achieves sub-cycle fault clearance (<1 power frequency cycle). Arc flash protection response time ≤ 2ms.
Measurement AccuracyAC voltage, current and power measurement are standard functions, supporting total RMS and fundamental magnitude/angle metering, with accuracy meeting industrial-grade metering standards.
I/O Configuration7 analog outputs (DC mA), 4 analog inputs (DC mA, configurable for 4–20mA / 0–20mA / 0–5V); digital I/O is expandable to suit circuit breaker and disconnector control and status monitoring.
Environmental AdaptabilityOperating temperature range: −40°C to +85°C. Compliant with IPC A-610-E Class 3 electronic manufacturing standards, environmental stress screening and full functional testing. Conformal coating for harsh environments is standard.
3. Core Protection Functions (ANSI Designations)
1. Differential Protection (Core Primary Protection)
Generator Stator Differential (87G)High-speed dual-slope differential algorithm with integrated CT saturation detection and directional supervision, accurately identifying stator phase-to-phase and ground faults and preventing maloperation due to external disturbances.
Generator-Transformer Overall Differential (87O)Covers the protection zone from the generator neutral to the high-voltage winding of the step-up transformer, providing dual backup protection for stator differential and transformer differential, supporting restrained / unrestrained differential logic.
Restricted Ground Fault (87GD)High-sensitivity protection for stator winding ground faults, suitable for high-resistance, low-resistance and hybrid grounding systems.
2. 100% Stator Ground Fault Protection
Combines overvoltage elements and third-harmonic voltage differential principles by comparing third-harmonic unbalance between the generator terminals and neutral, enabling 100% stator winding ground fault detection and distinguishing between internal and external generator faults.
3. Current / Voltage / Frequency Protection
Overcurrent Protection (50/50 Series)Phase / neutral / ground instantaneous / inverse-time overcurrent protection, supporting multiple IEEE and IEC inverse-time curves for various fault scenarios.
Voltage Protection (27/59 Series)Phase / auxiliary over / undervoltage, negative-sequence overvoltage, and volts/hertz (24) protection to prevent insulation damage caused by abnormal voltage conditions.
Frequency Protection (81 Series)Overfrequency / underfrequency / rate of change of frequency / out-of-band protection, suitable for grid frequency fluctuations and unit synchronization control.
4. Unit-Specific Protection
Loss of Excitation (40)Detects loss of generator excitation to avoid out-of-step conditions and system oscillations.
Reverse Power (32)Prevents the generator from operating as a motor and damaging the prime mover.
Thermal Overload (49TOL)Compliant with IEC 60255-8, combined with RTD temperature measurement for generator thermal condition monitoring, with alarm or tripping upon overload.
Arc Flash Protection (AFP)Integrated 4-channel arc sensor input, detects switchgear arc faults within 2ms and initiates fast tripping to reduce incident energy.
Other FunctionsPhase sequence reversal (47), negative-sequence unbalance (46), out-of-step (78), breaker failure (50BF), synchronism check (25), and a full range of additional protection functions.
4. Monitoring & Control Functions
1. Operational Monitoring
Parameter MeteringReal-time monitoring of three-phase voltage, current, power, power factor, frequency and other key electrical quantities, with data logging and trend analysis supported.
Equipment Health ManagementAccumulates generator operating hours and out-of-band operating time; monitors bearing vibration, excitation current, circuit breaker contact wear (arc current integration), closing and tripping time, etc., and generates visual health reports.
Environmental MonitoringPatented environmental monitoring system records temperature, humidity, transient voltage and other parameters, triggering alarms under abnormal conditions.
Event Recording1024 event records, 15 fault reports, and transient waveform capture for fault tracing and post-event analysis.
2. Control Functions
FlexLogic Programmable Logic8 user-defined protection elements (FlexElements), allowing logic programming based on measured quantities to meet customized control requirements.
Switchgear ControlSupports programmable control and interlocking for up to 3 circuit breakers and 9 disconnectors. Dynamic single-line diagrams (SLD) are configurable with 6 pages and 15 status elements per page.
Synchronization & Load ManagementSupports synchronism check, automatic synchronization and load sharing, suitable for parallel operation of multiple generating units.
5. Communication & Cybersecurity
1. Communication Interfaces & Protocols
Wired InterfacesDual Ethernet ports (supporting PRP/HSR zero-delay redundancy), fiber ST port, RS485, front USB port; supports IEC 61850 Ed2, DNP3.0, Modbus RTU/TCP, IEC 60870-5-103/104 and other standard protocols.
Wireless (Optional)Supports Wi-Fi with WPA-2 encryption for simplified configuration and diagnostics without personnel access to the switchgear.
2. Cybersecurity
Supports AAA (Radius/LDAP), RBAC (5 roles / 8 users), and Syslog security event logging, meeting NERC/CIP compliance requirements for user role-based access control and operation auditing.
Applications
- Primary protection for thermal, hydro and gas-fired generating units in industrial and utility power systems.
- Renewable energy power generation systems including cogeneration, wind power and photovoltaic plants.
- Integrated protection and monitoring for generator step-up transformers (GSU).
- Backup power protection for critical loads in data centers, hospitals, mines and other essential facilities.
- Upgrade and retrofit projects for legacy SR 489 relays.
Product Advantages
- High‑speed & reliable protection: Sub‑cycle differential protection, 100% stator ground fault protection and arc flash protection minimize fault damage comprehensively.
- Flexible application adaptability: Customizable configurations and FlexLogic logic satisfy generator requirements of various capacities and grounding schemes.
- High integration: Combines protection, control, monitoring and communication in one unit, reducing equipment count and system complexity.
- Easy maintenance & upgrade: Draw-out construction, field-replaceable power supply and retrofit kits lower total life-cycle costs.
- Compliance & security: Meets IEC, NERC/CIP and other standards, with advanced communication and cybersecurity features ideal for smart grid development.
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