Description
Key Technical Specifications
- Product Model: HIEE205010R0003 UNS3020A-Z V3
- Manufacturer: ABB
- System Platform: UNITROL Excitation Systems
- Power Supply Voltage: 24 V DC nominal (18-36 V DC range), ensuring stable operation across fluctuating auxiliary supplies common in power plants.
- Power Consumption: Less than 20 W under normal conditions, minimizing thermal impact in control cabinets.
- Fault Detection Sensitivity: Adjustable from 0.005 mA to 500 mA, allowing precise tuning to system insulation levels and preventing nuisance trips while catching incipient faults.
- Response Time: Less than 50 ms for fault detection and relay output, critical for limiting damage in high-voltage excitation circuits.
- Operating Voltage Range: Supports excitation voltages up to 1000 V DC (Variant 1) or higher variants for extended applications, protecting against field winding insulation breakdown.
- Operating Temperature Range: -10°C to +60°C, suitable for enclosed cabinet installations in turbine halls.
- Storage Temperature Range: -40°C to +85°C, facilitating reliable logistics and storage in diverse climates.
- Dimensions: Approximately 485 mm (L) x 135 mm (H) x variable depth, designed for panel or cubicle mounting.
- Weight: Around 5 kg, enabling straightforward handling during maintenance outages.
- Digital Outputs: Relay contacts for trip and alarm signals, with configurable normally open/closed states for integration with breaker controls.
- Self-Testing Function: Built-in diagnostics for electronic circuits, initiatable locally or remotely, enhancing reliability in continuous operation.
- MTBF: Exceeds 150,000 hours, contributing to high availability in mission-critical power generation.
- Certifications: CE marked; complies with IEC 60255 for protective relays and relevant EMC standards for industrial environments.
Technical Architecture & Functional Positioning
This relay occupies a protective layer within the excitation control hierarchy, monitoring the insulated rotor field winding for unintended grounding paths that could lead to severe arcing or secondary faults. In UNITROL systems, it interfaces with the automatic voltage regulator and power converter sections, providing an independent safety function that trips the field breaker upon detection of leakage currents. The design employs high-impedance measurement techniques to inject a low-frequency signal or monitor passive insulation resistance, distinguishing true faults from capacitive coupling effects inherent in rotating machinery.
Key technologies include microprocessor-based signal processing for noise rejection and adjustable thresholds, combined with opto-isolated outputs to ensure galvanic separation from high-voltage circuits. Self-testing routines periodically verify sensor integrity and processing paths, a feature that addresses regulatory demands for functional safety in power plants. These elements solve practical engineering challenges such as detecting low-level insulation degradation before catastrophic failure, particularly in aging generators where moisture or contamination gradually reduces resistance. By enabling early intervention, the relay reduces repair costs and extends equipment life, often preventing forced outages that impact grid reliability.
From a systems perspective, its independence from the main AVR logic provides defense-in-depth, complying with standards like IEC 61850 for substation protection coordination. In high-power applications, rapid response limits energy release during faults, protecting thyristor bridges and brushes in brushless setups.
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