Product Overview

The HIEE205010R0001, also designated as the UNS3020A-Z,V1, is a high-precision ground fault monitoring relay designed for the ABB UNITROL 5000 excitation system. This heavy-duty protection module is engineered to detect insulation degradation and earth leakage within high-power excitation circuits and generator windings. By providing early warning and rapid isolation of ground-fault conditions, the UNS3020A-Z,V1 prevents catastrophic damage to expensive synchronous machinery. Its robust construction, weighing 5.2kg, signifies its specialized role in high-availability power generation environments where electrical safety and equipment longevity are the primary operational metrics.

System Specifications and Hardware Profiles

The UNS3020A-Z,V1 is built for critical infrastructure, featuring a solid-state architecture that eliminates the mechanical latency found in standard safety relays.

• Order Code HIEE205010R0001

• Model Identification UNS3020A-Z,V1

• Product Line UNITROL 5000 Series

• Detection Type Ground Fault / Earth Leakage Monitoring

• Technology Solid-state sensing for ultra-fast response

• Module Weight 5.2 kg

• Physical Footprint 44 x 17 x 10 cm

• Chassis Build High-durability industrial housing for rack or panel mounting

• Origin of Manufacture Sweden

• System Integration Fully compatible with ABB DCS and excitation controllers

• HS Classification 8537101190

Industrial Protection and Field Utility

This ground fault relay is a fundamental safety component in sectors where high-voltage excitation is utilized to manage large-scale electrical loads.

• Generator Field Protection Continuously monitors the rotor and stator insulation of large generators in thermal, hydro, and nuclear power plants.

• Excitation System Safety Specifically designed to detect faults in UNITROL 5000 excitation loops, preventing phase-to-ground short circuits.

• Large Synchronous Motor Monitoring Safeguards heavy-duty industrial motors in mining and metals processing from winding failures caused by moisture or vibration.

• Substation Grid Reliability Minimizes the risk of uncoordinated tripping by providing precise fault detection and isolation at the source.

• Downtime Mitigation Provides proactive diagnostic data that allows maintenance teams to address insulation issues before they result in an unplanned system outage.