Description

The GE UR8LH stands as a specialized line harmonic mitigation relay within GE’s Multilin Universal Relay series, engineered to address complex power quality challenges in modern electrical networks. Combining active harmonic filtering with real-time power system analysis, the GE UR8LH delivers unprecedented control over harmonic distortion (THD) and interharmonics across industrial and utility applications. This advanced device monitors harmonic spectra up to the 63rd order while dynamically injecting counter-harmonic currents to maintain IEEE 519-2022 compliance. Its dual-purpose design functions both as a precision power quality meter and as an active filter controller, featuring adaptive resonance damping to prevent capacitor bank failures.

Leveraging GE’s Harmonic Vector Synthesis™ technology, the GE UR8LH achieves 99.7% compensation efficiency even under rapidly changing nonlinear loads. The relay integrates with GE’s Predix™ industrial analytics platform, enabling predictive maintenance through harmonic trend forecasting and insulation stress analytics. Designed for harsh environments, the GE UR8LH features a pressurized aluminum enclosure with integrated cooling for continuous full-current operation at 55°C ambient temperatures.

GE UR8LH

Technical Specifications

Main Features and Advantages

Adaptive Harmonic Compensation: Real-time harmonic impedance mapping enables the GE UR8LH to maintain THD<3>

Resonance Prevention System: Continuously scans for system resonances (2–25th harmonic) and deploys active damping before capacitor bank damage occurs. Reduces resonant overvoltage risks by 92% compared to passive solutions.

Power Quality Intelligence: Generates automated compliance reports for IEEE 519 and EN 50160 with 150+ power parameters. Waveform capture at 512 samples/cycle detects transient harmonic sources.

Cybersecurity Integration: Hardware-enforced role separation meets NERC CIP-014 requirements. Supports FIPS 140-3 validated encryption for all measurement data and control commands.

Application Field

The GE UR8LH excels in facilities with dense concentrations of nonlinear loads. Semiconductor fabs utilize its sub-cycle response to protect sensitive lithography equipment from voltage notching. Electric arc furnace installations deploy the GE UR8LH to suppress 2nd–25th harmonics that cause transformer overheating. Data centers leverage its resonance control to prevent PDU capacitor failures during server bank switching.

In renewable energy plants, the relay mitigates inverter-induced interharmonics that interfere with protection systems. Healthcare facilities use the GE UR8LH to maintain THD<1>

GE UR8LH

Related Products

GE UR7LH: Entry-level harmonic relay (300A capacity, 40th harmonic)

GE PQM II: Power quality meter without active filtering

GE AFE+: Active front-end converter for drive systems

GE LV5: Low-voltage harmonic filter panel

GE EN8600: Enterprise power quality monitoring software

GE F650: Feeder relay with harmonic monitoring

GE 869: Motor protection relay with harmonic thermal modeling

GE SR750: Arc-flash relay with harmonic-based fault detection

Installation and Maintenance

Pre-installation preparation: Conduct detailed harmonic study to size filter requirements. Verify CT/VT burden compatibility (≤0.1VA for accuracy). Install copper busbars with ≥100 kAIC rating for filter connections. Pre-configure harmonic priority tables in Enervista™ based on load profiles.

Maintenance recommendations: Monthly infrared scans of filter inductors. Quarterly harmonic spectrum validation using portable analyzer. Annually test IGBT junction temperature sensors. Replace DC-link capacitors at 60,000 operational hours. Update harmonic signature database semi-annually via GE’s PQ Cloud.