Key Technical Specifications
- Product Model: UA C326 AE01 HIEE401481R0001
- Manufacturer: ABB
- System Platform: UNITROL Excitation System
- Analog Inputs: Multiple channels supporting 4-20 mA, ±10 V, and thermocouple/RTD types for field current and voltage sensing.
- Digital I/O: Combined discrete channels for status monitoring and control outputs, opto-isolated.
- Resolution: 12-16 bit A/D conversion for accurate signal representation in regulatory loops.
- Isolation: Galvanic isolation >1500 V between field and control sides to withstand converter transients.
- Power Supply: 24 V DC auxiliary, with redundancy support in dual-channel configurations.
- Operating Temperature Range: -20 °C to +70 °C, adapted for power plant cabinet installation.
- Communication Interface: Optical or backplane links for integration with main controller.
- Dimensions: Approx. 290 mm (L) x 290 mm (H) x 30 mm (D), rack-mountable.
- Weight: 0.45 kg.
- Certifications: CE compliant, aligned with IEC 61010 and EMC standards for power electronics environments.
- Response Time: <5 ms for critical signals, enabling fast excitation response.
- Environmental Protection: Conformal coating for humidity and dust resistance in generator vicinity.
Technical Architecture & Functional Positioning
The UA C326 AE01 module operates at the interface layer within the UNITROL excitation architecture, bridging field sensors/actuators to the central processing unit. It consolidates analog measurements (such as rotor current, voltage, and temperature) with digital status signals (limits, alarms, and commands), providing a unified I/O platform that streamlines cabling and enhances signal integrity in high-noise power converter environments.
Core technologies include multiplexed high-resolution converters with built-in filtering and linearization for thermocouples/RTDs, alongside opto-isolated digital channels for reliable binary operations. This hybrid design supports both continuous regulation (AVR/PSS functions) and discrete protection sequences, with diagnostic feedback for each channel to facilitate predictive maintenance. Such integration reduces latency in closed-loop control, crucial for maintaining generator stability during grid faults or load transients.
Engineering benefits are pronounced in excitation reliability: the module’s robust isolation prevents ground loops from thyristor switching noise, while its combined functionality minimizes module count in redundant setups, lowering failure points and simplifying spares management. In retrofit scenarios, it enables seamless upgrades of older UNITROL systems, preserving field wiring investments while improving measurement accuracy for better compliance with modern grid codes.
Typical Application Scenarios
- Deployed in thermal and gas power plants for main excitation I/O processing, ensuring precise field current control and rapid forcing during disturbances.
- Integrated in hydroelectric generators for mixed signal handling in brushless excitation, supporting limiter functions and de-excitation sequences.
- Serves as direct replacement in legacy UNITROL retrofits, enhancing diagnostic capabilities without extensive rewiring.
- Used in industrial synchronous motors for combined monitoring of voltage regulators and protection relays.
- Applied in co-generation facilities for reliable interfacing under variable load and environmental conditions.
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