ABB 3BHE021887R0101 UBC717 BE101 OVVP-Board

I. Basic Product Information
Original part number: 3BHE021887R0101
Board card model: UBC717 BE101
Abbreviation: OVVP-Board (Over Voltage Protection Board, Over Voltage Protection Board)
Brand origin: Manufactured by ABB, Swedish original factory
Core system: UNITROL series generator excitation system (UNITROL 5000/6000 mainstream compatibility), dedicated protection substrate for synchronous generator excitation power module
Equipment positioning: Excitation power bridge, dedicated instantaneous overvoltage suppression for thyristor / IGBT power circuits, surge absorption, clamping protection to prevent high-voltage spikes on the excitation inverter side and rotor side from breaking down power devices

Core Functional Features
High-power transient overvoltage clamping
Specifically absorbs reverse high voltage from generator shedding load, short circuit, grid connection impact, and commutation overvoltage, quickly discharging energy, protecting thyristor rectifier bridge, excitation power module.
Multi-level energy absorption circuit
Integrated with varistors, RC resistive-capacitive absorption, and rapid current continuation and discharge circuits for triple protection, with response time at the microsecond level, suitable for high-power excitation conditions.
Fault monitoring and signal feedback
On-board status detection circuit, after protection action, sends fault alarm signal to the main control AVR board, triggering excitation limit / shutdown interlock.
High insulation anti-interference design
Strong and weak electrical zone wiring, electrical isolation of high-voltage circuits from control signals, capable of withstanding strong electromagnetic and harmonic interference from power plants.
Coating three-proof process
Original factory with moisture-proof, dust-proof, and corrosion-proof coatings, suitable for multi-dust, temperature difference large cabinet environment of power plants.
Standard rack plug-in structure
Matches UNITROL excitation cabinet standard slots, plug-and-play installation, convenient for replacement and maintenance.

Complete Technical Electrical Parameters
1. Voltage tolerance specifications
Rated working compatible excitation circuit voltage: Maximum DC 250V (compatible with small and medium-sized unit excitation)
Maximum instantaneous clamping voltage: 420V DC
Impact discharge peak current: Instantaneous up to kiloampere-level pulse discharge
Control auxiliary power supply: 220V AC 50/60Hz power taken from the board
2. Power consumption and insulation
Static standby power consumption: ≤ 8W; Peak instantaneous power consumption during protection action increases briefly
Insulation withstand voltage: 2000V AC withstand test between high-voltage power side and control signal side
Loop protection: Built-in self-melting fuse, board internal short circuit will not spread to the entire excitation system
3. Environmental operating parameters
Operating temperature: -20℃ ~ +60℃
Storage and transportation temperature: -40℃ ~ +85℃
Relative humidity: 5%–95% RH, no condensation
Protection level: IP20 (installed in the control cabinet room)
EMC certification: Compliant with IEC 61000-6-2, IEC 61000-6-4 power industry electromagnetic compatibility standards
Shaking impact: Meets IEC 61131-2 industrial control power equipment specification
4. Physical dimensions and weight
Dimensions: Approximately 240mm × 150mm × 45mm
Net weight: Approximately 1.0kg
Installation method: Fixed to the standard back panel slot of UNITROL excitation cabinet, multi-group large-power connection terminals directly connected to the power bus