Description
Technical Specifications
- Product Model: 3BHB024945R0001
- Brand: ABB
- Warranty: One Year
- Power Supply: 24 V DC logic supply 18‑30 V DC; auxiliary gate‑drive power derived from excitation power unit
- Operating Temperature: ‑20 °C ~ +70 °C; 5‑95 %RH non‑condensing; conformal‑coated PCB for power‑plant cabinet environment
- Storage Temperature: ‑40 °C ~ +85 °C
- Response Time: µs‑level SCR firing pulse generation; synchronized to 50/60 Hz mains
- Protection Class: IP20 rack‑mount plug‑in board; non‑hot‑swap, rack power must be de‑energized before removal
- Channel: 6‑channel isolated gate pulse outputs for three‑phase SCR rectifier bridge
- Accuracy Class: Gate‑drive interface board, no analog measurement accuracy
- Communication Interface: Backplane connector for UNITROL control rack; differential firing command input from main AVR controller; terminal block for SCR status feedback, thermal‑switch signals; multi‑color status LED indicators; hardware configuration jumpers
- Supported System: ABB UNITROL series static excitation system; receives firing angle commands from main control board, drives SCR power bridge
- Overload Capacity: Galvanic isolation for each SCR gate channel; gate‑output short‑circuit protection; SCR heatsink over‑temperature monitoring; bridge fault feedback detection; ESD & surge protection
- Dimensions: 260 mm × 210 mm × 30 mm; weight approx. 1.88 kg
Product Overview
3BHB024945R0001 is SCR gate‑trigger interface board for ABB UNITROL generator static excitation system. It receives low‑level firing‑angle commands from the main AVR controller board, amplifies and galvanically isolates signals, generates high‑energy trigger pulses for six SCR thyristors of the three‑phase rectifier bridge. It collects critical power‑bridge status signals: SCR heatsink temperature, fault feedback from power semiconductors, and feeds diagnostic status back to the UNITROL main controller. This board directly controls generator field excitation current to stabilise generator terminal voltage and reactive‑power output.
Important: Cannot run standalone; must work with UNITROL main‑control board, power‑bridge assembly and power‑distribution unit.
Application Scenarios
- Thermal‑power‑plant turbo‑generator UNITROL static‑excitation cabinet: SCR firing drive for generator excitation rectifier bridge.
- Combined‑cycle gas‑turbine / steam‑turbine generator‑sets: Excitation power‑bridge gate‑pulse control.
- Hydro‑power‑station synchronous‑generator excitation‑control racks.
- Industrial captive‑power‑plant synchronous‑generator excitation‑control.
- Legacy UNITROL‑system retrofit & spare‑part replacement: Drop‑in spare hardware; back‑plane pin‑out, jumper‑setting and mechanical dimension compatibility minimizes cabinet‑rework and shortens generator‑unit downtime during board swap‑out.
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