ABB UN0661AV1 69203IV1AA Excitation Acquisition Interface Board

ABB UN0661AV1 (Material Code: 69203IV1AA) Excitation Acquisition Interface Board Detailed Explanation

1. Model Classification

1. Product Line: Belongs to the ABB **UNITROL Generator Set Excitation Control System UN Series Board Card Family**, where `UN0661AV1` is the main hardware model, and `69203IV1AA` is the exclusive factory part number for this board card. This is in line with the previously queried same model `69203GB1AA`, the pulse drive board `69203PY2AA`, which are all components of the complete excitation cabinet set; the suffix `IV` represents **a dedicated version for current and voltage analog quantity acquisition**, while `GB` is for general signal conditioning version. The channel definitions of these two are different and cannot be interchanged.
2. **Applicable Scenarios**: Special acquisition board for synchronous generator excitation control cabinets in thermal power and hydropower plants, responsible for collecting and preprocessing the terminal voltage and excitation circuit current signals, providing the original data for the excitation main control unit for closed-loop regulation.

2. Core Hardware Parameters Table

| Parameter Item | Specification Details
| Power Supply Method | Centralized DC24V power supply on the back panel of the cabinet |
| Installation Form | Embedded installation in standard rack slots, IP20 protection for indoor cabinets |
| Channel Capacity | Multiple isolated current/voltage analog sampling channels, suitable for connecting secondary side signals of PT/CT transformers of the unit |
| Isolation Design | Electrical isolation between channels and the main control circuit, resisting electromagnetic interference caused by high-power thyristors in the excitation cabinet and avoiding high voltage leakage to damage the core main control card |
| Operating Temperature Range | -20℃ to +70℃, suitable for regular high-temperature conditions in power station machine rooms
| Status Indication | Built-in LED lights for channel status, allowing for intuitive viewing of the connection status of the sampling chain

Core Functions

1. **Precise Sampling of Generator Electrical Parameters**: Collect analog signals such as generator terminal voltage, excitation current, and reactive load, perform level adaptation, filtering and noise reduction, and transmit them to the excitation main control board for voltage regulation and reactive power closed-loop calculations;
2. **Isolation of High and Low Voltage**: Isolate the high-voltage sampling circuit on the transformer side from the low-voltage control circuit, avoiding surge impacts that could damage the core CPU;
3. **Fault Monitoring and Reporting**: Real-time monitoring of sampling disconnections and signal over-range abnormalities, triggering local alarms through the main control system and synchronously pushing to the power plant’s DCS/SCADA platform;
4. **Expansion of Measurement Points**: Reserve spare channels to connect to generator temperatures and limit switch quantities, improving the sampling link for interlock protection.

Typical Application Scenarios

The UNITROL excitation control cabinet for steam turbine/water turbine units in power plants can be combined with ABB RTU560 telecontrol system and HIMA X-CPU31 safety controller to achieve remote scheduling of excitation parameters, and full-process control of over-limit shutdown interlocks.