CD235B101 3BHE032025R0101 CONTROLLER

Brand: ABB

Product Series: UNITROL Excitation Systems / Megawatt Control Series

Model: CD235B101 / PCD235 B101 (Part Number / Ordering Code: 3BHE032025R0101)

Product Type: Exciter Control Module / Excitation System Controller Card

CD235B101 3BHE032025R0101 CONTROLLER

Technical Parameters:

System Compatibility: Dedicated excitation processor module designed for integration within ABB UNITROL static excitation systems (SES) and automatic voltage regulator (AVR) control cabinets.

Functional Role: Executes digital control algorithms for generator voltage regulation, reactive power control, power factor regulation, and excitation current limiting.

Processing Capability: High-speed micro-controller processing architecture engineered for real-time calculation of firing angles, dynamic response control, and transient stability during grid disturbances.

Communication Protocols: Integrated system bus communication interface for seamless dataset exchange with central DCS controllers and UNITROL operator interfaces.

Diagnostic Telemetry: Advanced onboard diagnostic capabilities providing continuous self-monitoring, temperature telemetry, fault logging, and system status indication.

Galvanic Isolation: Optoelectronic isolation circuitry designed to isolate signal processing loops from high-power thyristor bridge feedback and field transients.

Operating Thermal Range: Industrial temperature envelope rated for heavy-duty power generator station environments (-10°C to +60°C operating range).

Physical Dimensions & Weight: Measures approximately 375 mm (W) x 142 mm (H) x 72 mm (D) with a net weight of approximately 1.48 kg.

Industrial Sectors:

Thermal and Fossil Power Generation, Hydroelectric Power Plants, Nuclear Power Station Infrastructure, Gas Turbine Power Facilities, Large Industrial Cogeneration Plants, and Heavy Metallurgy/Mining Energy Grids.

Application Scenarios:

1. Synchronous Generator Automatic Voltage Regulation (AVR): Serves as the primary excitation controller to maintain stable generator terminal voltage across varying load conditions.

2. Power System Dynamic Transient Response: Adjusts field current rapidly during grid faults, short-circuit recovery, or load shedding to prevent generator step-out and maintain grid frequency stability.

3. Excitation System Modernization and Retrofit: Installed during power plant excitation system overhauls to replace legacy analog AVR units with modern digital UNITROL control architectures.

4. Large Synchronous Motor Excitation Control: Controls field excitation current on massive industrial synchronous motors in steel mills, cement plants, and mining crushers to optimize power factor and energy efficiency.