Application Scenarios
In a hydroelectric power station’s UNITROL 5000 excitation cabinet, the generator’s terminal voltage must be maintained within ±0.5% under rapidly fluctuating load conditions. The 3BHE021083R0101 sits directly on the high-voltage side of the thyristor power bridge, continuously sampling the three-phase AC input from the excitation transformer secondary. When a grid disturbance causes voltage imbalance across the three phases, the board’s resistor network detects the asymmetry and sends a pre-fault warning to the AVR before the condition escalates into a thyristor failure. If this HVD board alarms, the AVR loses its voltage feedback entirely—the generator must immediately reduce load, costing hundreds of thousands in lost generation per day. The XVC770 BE10 exists precisely to prevent that scenario, providing the isolated, conditioned voltage signal that keeps the AVR closed loop intact.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 3BHE021083R0101 (XVC770 BE10 / BE101) |
| Manufacturer | ABB |
| Product Category | HVD High Voltage Divider Board (Coated Version) |
| Compatible Systems | UNITROL 5000 / UNITROL 6000 static excitation systems |
| Core Function | High-voltage precision voltage sampling for AVR feedback |
| Power Supply | 24 V DC (cabinet backplane or terminal supply) |
| Isolation Rating | ≥3000 Vrms power-frequency withstand, strong/weak current isolation |
| Signal Path | HV AC input → precision resistor divider → optical/galvanic isolation → low-voltage AVR signal |
| Additional Functions | Three-phase voltage balance monitoring, phase-loss/overvoltage pre-detection, synchronization phase sampling |
| Communication Interface | Onboard DB9 (to excitation control signal conditioning board) |
| Coating Process | Full-board acrylic conformal coating, 50–100 μm |
| Operating Temperature | -20°C to +70°C |
| Mounting | XVC770 control rack dedicated slot / VME plug-in card |
| Weight | Approx. 0.36 kg |
| Replacement Compatibility | Direct replacement for legacy 3BHE006414R0001 (XVC770 AE, non-coated) |
