Model 469-P5-HI-A20-E Manufacturer GE Grid Solutions (Multilin™ series) Product Type Digital Motor Protection Relay Voltage Class Up to 15 kV (Medium Voltage) Current Input High-Impedance (HI) – Designed for 5 A or 1 A CTs with high burden (e.g., HIGS applications) Protection Functions Thermal overload (RTD & I²t), Phase/ground overcurrent (50/51, 50N/51N), Negative sequence (46), Stall/jog (51LR), Undercurrent (37), Phase imbalance, Differential (optional), Arc flash detection (with fiber input) Inputs 3-phase CTs + residual (or 3I₀), 4x Binary Inputs, 4x RTD inputs (Pt100/Cu10) Outputs 6x Form-C programmable relays, 2x 4–20 mA analog outputs Communication RS-485 (Modbus RTU), Ethernet (Modbus TCP), IEC 61850 optional, DNP3 Display Backlit LCD with keypad (local HMI) Cyber Security IEC 62443 compliant, password protection, audit trail Standards IEEE C37.96, IEC 60255, ANSI/NETA PTS Product Introduction The GE Multilin 469-P5-HI-A20-E is a high-performance, multifunction digital motor protection relay engineered for comprehensive safeguarding of medium-voltage (up to 15 kV) induction and synchronous motors in demanding industrial environments. As part of GE’s globally trusted Multilin™ 469 family, this specific model—denoted by the suffix -HI-A20-E—is optimized for high-impedance grounded systems (HIGS), featuring high-impedance (HI) current inputs that ensure accurate operation even with high-burden current transformers commonly used in resistance-grounded networks. Equipped with advanced thermal modeling (both electrical I²t and direct RTD-based), ground fault protection down to 0.05 A, negative-sequence overload detection, and optional arc flash mitigation, the GE 469-P5-HI-A20-E delivers unmatched reliability for critical assets like pumps, compressors, fans, and conveyors. Its integrated metering, event recording (with 16-cycle oscillography), and dual communication ports enable seamless integration into modern SCADA and asset management platforms—transforming it from a simple protector into a full-featured motor health monitor. Core Advantages and Technical Highlights Optimized for High-Impedance Grounded Systems (HIGS): The “HI” in 469-P5-HI-A20-E signifies specially designed current inputs with high burden tolerance (up to 10 VA), allowing reliable operation with older or high-impedance CTs typical in HIGS installations—common in petrochemical plants, refineries, and mining operations where ground fault currents are intentionally limited to 5–10 A. Dual Thermal Protection Models: Unlike basic relays, the GE 469-P5-HI-A20-E combines electrical thermal modeling (I²t with cooling curves) and direct RTD monitoring (4 channels for stator/winding/bearing temps). This dual approach prevents nuisance trips during frequent starts while catching slow-developing thermal faults missed by current-only methods. Arc Flash Mitigation Ready: With an optional fiber-optic arc flash sensor input, the relay can detect intense light from internal bus or terminal faults and trip in < 4 ms, drastically reducing incident energy—critical for compliance with NFPA 70E and personnel safety in enclosed motor control centers (MCCs). Advanced Diagnostics & Data Logging: Stores up to 64 fault records with time-stamped oscillography (voltage/current waveforms), sequence-of-events (SOE), and motor start logs (including start time, locked rotor events). This data is invaluable for root-cause analysis and predictive maintenance. Cyber-Secure & Future-Ready: Supports secure remote access via Ethernet with role-based login, configuration audit trails, and firmware integrity checks—meeting IEC 62443 requirements. The “-E” suffix confirms Ethernet capability (Modbus TCP), enabling easy integration into IIoT and cloud-based monitoring systems. Typical Application Scenarios In oil & gas processing facilities, the GE 469-P5-HI-A20-E protects critical crude oil transfer pumps operating on high-resistance grounded 4.16 kV systems. Its HI inputs ensure stable ground fault detection despite long cable runs and aged CTs, while RTD inputs monitor bearing temperatures to prevent catastrophic seizure. In mining conveyor drives, the relay’s negative-sequence (46) protection detects phase imbalances caused by damaged cables or contactor wear—preventing motor burnout in remote, hard-to-access locations. The 4–20 mA outputs feed real-time load data to central control for energy optimization. For municipal water treatment plants, the GE 469-P5-HI-A20-E safeguards large aeration blower motors, using undercurrent (37) logic to detect belt slippage or impeller damage, and stall protection to avoid overheating during clogged intake events. Its rugged design withstands humid, corrosive environments. During legacy system upgrades, the 469-P5-HI-A20-E often replaces older electromechanical or early digital relays (e.g., original 469 or GEM) with minimal wiring changes—thanks to backward-compatible I/O and configurable logic—while adding Ethernet connectivity and arc flash readiness. Related Model Recommendations 469-P5-HI-A20: Non-Ethernet version (RS-485 only) – for cost-sensitive or legacy serial networks 469-P5-DIFF-A20-E: Includes built-in motor differential protection (87M) – for ultra-fast internal fault clearing 469-P5-HI-A20-E-F: Factory pre-configured with fiber arc flash input enabled GE Enervista 469 Setup Software: Official configuration & testing tool (free download from GE) Multilin 750: Next-gen platform with touchscreen, IEC 61850 native, and enhanced cybersecurity CT Adapter Kit (1MRK521000-UU): For retrofitting to existing CT wiring without panel modifications Installation, Commissioning & Maintenance Instructions Installation Tips: Mount in a ventilated enclosure away from heat sources. Use shielded, twisted-pair cables for CTs and binary inputs; ground shields at relay end only. For HI inputs, verify CT burden does not exceed 10 VA at rated current. Connect Ethernet to a managed switch with VLAN segmentation for security. Commissioning Best Practices: Load motor nameplate data (FLA, LR time, service factor) into thermal model. Calibrate RTD inputs if using Pt100/Cu10 sensors. Set ground fault pickup based on system capacitance (typically 0.1–0.3 A for HIGS). Test trip logic using Enervista software or secondary injection test set. Enable Modbus TCP registers for SCADA polling (e.g., amps, kW, trip status). Maintenance Guidance: Review event logs quarterly for abnormal starts or thermal accumulations. Verify RTD readings against handheld IR thermometer annually. Perform functional tests every 3 years (or per NFPA 70B). Update firmware only via GE-approved channels to maintain cybersecurity integrity. Replace unit if display flickers, communication fails persistently, or self-test alarms occur.