DAPC100 3ASC25H203-57 ABB control board

Brand: ABB

Product Series: Excitation Systems / UNITROL Control Series

Model: DAPC100 (Part Number: 3ASC25H203-57 / 3ASC25H203)

Product Type: Digital Automatic Power Control and Excitation Control Board

DAPC100 3ASC25H203-57 ABB control board

Technical Parameters:

Processing Architecture: High-performance digital microprocessor system engineered for real-time control loop calculations of large synchronous machines.

Control Functions: Integrates automatic voltage regulation (AVR), power factor control, reactive power control, and field current regulation algorithms.

Protection Interlocking: Embedded monitoring loops for overexcitation, underexcitation, stator current limitation, and transducer failure protection.

Interface Layout: Dedicated high-speed internal bus connectors designed for multi-channel communication across backplane racks.

Signal Processing: High-resolution analog-to-digital (A/D) converters for low-latency sampling of generator voltage, line current, and field variables.

Communication Protocols: Supports standard industrial interfaces and serial linkages to map diagnostic metrics and control words up to a plant SCADA system.

Environmental Resilience: Rugged industrial circuit board coating providing insulation against thermal stress, vibration, and severe electromagnetic interference (EMI).

Industrial Sectors:

Power Generation Utilities (Hydro, Thermal, Gas, and Nuclear Power Plants), Heavy Chemical and Petrochemical Refining, Marine Propulsion and Large Vessel Engineering, and Heavy Metallurgical Processing.

Application Scenarios:

1. Generator Excitation Control: Installed inside ABB UNITROL excitation systems to act as the primary computing engine, dynamically regulating the field current of massive synchronous generators to maintain stable grid voltage.

2. Power Plant Grid Synchronization: Deployed in utility substations and power plants to match generator phase angles, frequency, and voltage profiles precisely with the utility grid prior to breaker closure.

3. Reactive Power Compensation: Deployed within large industrial microgrids (such as steel mills or chemical complexes) to manage the power factor of large synchronous motors, stabilizing localized voltage drops caused by heavy inductive loads.

4. Marine Power Management: Deployed within the main propulsion control cabinets of large cruise ships or industrial vessels to stabilize onboard generator outputs under rapidly fluctuating thruster and auxiliary machinery loads.