I. Product Description
Original Part Number: 3BHB007438R0001
Prefix Definition: 3BHB = ABB UNITROL 5000/6000 Generator Static Excitation System Special Board Card Series (for large power thermal power / hydroelectric generator AVR excitation regulator)
Suffix Interpretation
007438: Board Card Function Sequence Code
R0001: Hardware First Version (V1) Prototype Version
Companion System: UNITROL 5000 Full Series Excitation Power Cabinet + Regulation Control Cabinet, and REF542plus, SUE3000 are completely separate independent systems and cannot be interchanged
Product Positioning
UNS Series Excitation Analog Signal Acquisition and Conditioning Board (MUB Measurement Unit Sub-Board)
Core Function: Collect generator terminal PT voltage, CT stator current, rotor excitation current, perform isolation amplification, filtering pre-processing, and send to the main regulation CPU to complete voltage closed-loop PID calculation, which is the signal front-end core board card for excitation system voltage stability control.
Core Hardware Functions
Multiple Isolated Analog Input Channels
Three-phase terminal voltages (PT secondary 100V)
Three-phase stator currents (CT secondary 5A)
Rotor DC Excitation Current Sampling
All channels have high-voltage electrical isolation, with a withstand voltage of 2kV AC, to prevent strong electricity from damaging the main control
Signal Preprocessing
Hardware low-pass filtering, range self-adaption, open-circuit detection; any PT/CT open-circuit immediately reports system alarm, locking overexcitation / de-excitation protection
Backplane High-Speed Parallel Bus
Real-time interaction with UNITROL main control CPU for sampling data, refresh cycle ≤ 1ms, meeting excitation millisecond-level voltage regulation response
On-board Self-Diagnosis
Power supply abnormality, channel short circuit, ADC failure, bus communication loss, panel LED graded alarm
Electrical Specifications
Power Supply: Backplane of the cabinet DC24V ±10%, total power consumption 4.2W
Sampling Accuracy: Voltage / Current 0.2 grade, meeting generator set measurement grade accuracy
Operating Temperature: -20℃ ~ +70℃, cabinet IP20 protection
EMC: Meet the power standard IEC61000-4 complete set of anti-interference, suitable for power plant strong electromagnetic environment
Installation: Standard 6U rack plug-in type board card, spring European terminal connected to PT/CT secondary circuit
Version Differentiation of the Same Series Table
Material Model Hardware Version Difference Explanation
3BHB007438R0001 V1 Initial Version Stocked old units’ original equipment, basic acquisition channel
3BHB007438R0002 V2 Improved Version Optimized filtering circuit, stronger anti-frequency interference, can downwardly compatible with R0001 replacement
Typical Application Scenarios
Thermal power plants, hydropower stations, gas turbine power generation units UNITROL5000 excitation regulator power cabinet
Large synchronous motors, synchronous condensers static self-excited excitation system
Old power plants’ excitation renovation, fault spare parts replacement (original factory stock is scarce, test pieces from disassembly are mostly circulating)
Seven. Key Maintenance Precautions
Do not plug or unplug while powered on: Directly connect the board to the PT voltage circuit, hot plugging is very likely to cause voltage short circuit, excitation system out of control and shutdown; Before replacement, the secondary small switch of the excitation cabinet must be disconnected
Cannot be mixed with REF542plus (1VCF750090 series), SUE3000 transmission controller, the bus, power supply, interface are completely incompatible
The secondary circuit of PT/CT must not be open-circuited, although this board has a break warning, long-term open-circuit will burn out the channel sampling resistor
For replacement in the same cabinet, it is recommended to use the same R0001 version; Using R0002 to replace does not require modifying the excitation program, just power on and it can run
After replacement, perform no-load voltage regulation, short-circuit test to verify sampling accuracy, confirm that reactive power regulation has no deviation
Eight. Differentiation of similar excitation boards in the same series (avoiding procurement confusion)
3BHB006338R0001 UNS0881A-P: IGBT / Thyristor Gate Drive Board (Pulse Output)
3BHB007438R0001: MUB Analog Measurement and Acquisition Board (Signal Input)
3BHB006208R0001 UNS0883A-P: Fast Switching Quantity IO Board (DI/DO Interlock)
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