ABB 3BUS208796-001 Signal Conditioning Board

I. Basic Identity Information
Original Part Number: 3BUS208796-001
Category: Special-purpose high-precision power signal conditioning board for power supply
Origin: ABB, Sweden
Hardware Version: Common REV.B
Overall Equipment Classification: HKQCS Generator Set Excitation / Power Measurement System, used in conjunction with AC800PEC Excitation Controller, dedicated board for collecting active/reactive power, current, voltage measurements of steam turbine / hydro turbine generators in power plants
Status: The original factory has discontinued production. Only brand-new original / dismantled second-hand spare parts are in circulation

 Core Functions
High-power electrical signal isolation and conversion
Collect secondary-side analog quantities of PT voltage and CT current, complete electrical isolation, voltage division, filtering, amplification, and output standard ±10V high-speed signals to AC800PEC controller for power closed-loop calculation;
Real-time processing of active/reactive power
On-board hardware multiplier circuit, directly preprocess P/Q power signals, reduce CPU computing load, meet excitation AVR, PSS control cycle of milliseconds;
Strong electromagnetic isolation and anti-interference
High and low voltage circuits are completely electrically isolated, suitable for excitation cabinets of power plants, strong interference environments of high-voltage plant power supply;
Hardware diagnostics for breakage / overvoltage
Built-in hardware detection for signal over-limit, CT breakage, PT loss of voltage, fault hard contacts upload to controller for alarm.

Hardware Interfaces and Structure
Backside European-style connectors: Multi-channel CT/PT input terminals (A/B/C three-phase current, three-phase voltage);
Front row wiring interface: Connected to UAD155A IO cabinet / AC800PEC main control optical fiber interface unit;
On-board status indicator lights: Power, signal normal, fault alarm LED;
Installation method: Standard cabinet slot horizontal insertion type, fixed in the lower signal acquisition slot of the excitation control cabinet.

Electrical Specifications
Power supply: 24VDC internal control power supply
Input: CT 1A/5A, PT 100V secondary-side standard power signal
Output: Isolated ±10V high-speed analog signal
Isolation withstand voltage: 2kV AC, in accordance with power plant EMC standards
Operating temperature: -20℃ ~ +60℃
Weight: Approximately 2.1kg

Associated Equipment (The complete system of the model you previously queried)
ABB AC800PEC main control + UAD155A0111 high-speed IO cabinet
3BUS208796-001 power signal conditioning board (CT/PT acquisition front-end)
RH102AN industrial switch (IEC61850 networking)
REC670 interval protection device (配套 for the generator set comprehensive protection)
Prosoft PTQ-PDPS PROFIBUS communication card (connects to third-party DCS/GE Mark VIe)