GE DS200DCFBG2BNC MRP420024 Power Supply Board

I. Overview

The DS200DCFBG2BNC adopts an industrial-grade reinforced board architecture, with dimensions of 180mm×120mm×25mm. It is compatible with the standard 6U rack (19 inches) of the Mark VI system and supports dual-board redundancy configuration in a single system (main-standby switching time ≤50ms) to meet the redundancy requirements of critical equipment. Its core features an integrated design of "excitation command generation unit + current closed-loop control unit + fault protection unit". The input interface supports 3 channels of analog signals (stator voltage, stator current, excitation current feedback, 4-20mA) and 2 channels of digital signals (speed pulse, grid connection status). The output interface supports 2 channels of PWM drive signals (for controlling thyristor triggering) and 1 channel of relay output (for emergency de-excitation). The housing uses a gold-plated PCB board with a built-in electromagnetic shielding layer, achieving an IP20 protection level to enhance protection against strong electromagnetic environments in power plants. It has an operating temperature range of -10℃ to 65℃, a relative humidity of 5% to 95% (non-condensing), and a storage temperature range of -40℃ to 85℃. Internally, it adopts a design of "analog channel isolation + power surge protection". The isolation voltage between the analog input and the backplane bus is ≥2kVrms, and the power port supports ±4kV surge protection, effectively resisting grid fluctuations and electromagnetic interference in power plants. It is compatible with GE CIMPLICITY Machine Edition programming software, supporting the configuration of excitation control parameters (such as PID parameters and overcurrent thresholds) through software, which reduces the difficulty of system integration.

II. Technical Parameters

1. Excitation Control Performance Parameters

2. Input and Output Parameters

3. Environmental and Reliability Parameters

4. Communication and Diagnostic Parameters

III. Functional Characteristics

1. High-Precision Excitation Regulation to Ensure Motor and Grid Stability

• Constant Voltage Control: Through PID closed-loop regulation, when the grid voltage fluctuates by ±10%, the stator voltage control accuracy remains at ±1%. In a 300MW turbogenerator, when the grid voltage drops from 38.5kV to 36.6kV (-5%), the board increases the excitation current by 8% within 0.5ms, raising the stator voltage back to 38.3kV and avoiding grid load tripping.

• Excitation Limitation Protection: Built-in over-excitation limitation (to prevent the excitation current from exceeding 120% of the rated value) and under-excitation limitation (to prevent motor loss of synchronization). When a hydrogenerator rejects load, the excitation current rises sharply, and the over-excitation limitation is triggered to reduce the current from 1200A to 1000A (rated value) within 1ms, avoiding overheating of the excitation winding.

• Shock-Free Grid Connection: Supports automatic quasi-synchronous grid connection. By adjusting the excitation current, the voltage difference between the motor and the grid is ≤1% and the frequency difference is ≤0.1Hz. The current impact at the moment of grid connection is ≤5% of the rated current. During the grid connection commissioning of a new power plant, "zero-impact" grid connection is achieved, reducing the mechanical stress on the motor.

2. Strong Anti-Interference and Wide-Temperature Design to Adapt to Harsh Power Plant Environments

• Electromagnetic Shielding and Isolation: Gold-plated PCB board + electromagnetic shielding layer, with 2kVrms isolation for analog channels. Near 10kV high-voltage motors in power plants (with electromagnetic radiation of 30V/m), the signal-to-noise ratio of excitation current collection is ≥80dB without false fluctuations (the signal-to-noise ratio of traditional boards is only 60dB).

• Wide-Temperature and Heat Dissipation Optimization: Operating temperature range of -10℃ to 65℃, using high-temperature-resistant components (capacitors with a temperature resistance of -55℃ to 125℃). In the high-temperature environment (60℃) of the power plant's generator room in summer, the board temperature is only 5℃ higher than the ambient temperature, with no performance degradation.

• Grid Surge Protection: The power port provides ±4kV surge protection. When a lightning strike causes a sudden rise in grid voltage (+20%) in the power plant, the board automatically cuts off the excitation output and issues an alarm, avoiding thyristor burnout (repair cost exceeds 20,000 yuan).

3. Fast Fault Response and Redundancy to Reduce Shutdown Risks

• Millisecond-Level Fault Response: When excitation overcurrent occurs (exceeding 150% of the rated value), emergency de-excitation is triggered within 1ms, and the de-excitation time is ≤0.1s. In the case of a short-circuit fault in the excitation winding of a turbogenerator, fast de-excitation avoids winding burnout (repair cost exceeds 500,000 yuan).

• Fault Recording and Tracing: When a fault occurs, automatic fault recording (data 5 seconds before and after the fault) is performed to record the change curves of excitation current and voltage. Maintenance personnel can view the waveforms through software to quickly locate the cause of the fault (such as thyristor triggering fault, current sensor abnormality). In an excitation fault of a power plant, the fault troubleshooting time is reduced from 8 hours to 30 minutes.

• Dual-Board Redundancy: The main and standby boards synchronize data in real time. When the main board fails, it switches to the standby board within 50ms, and the excitation current fluctuation during switching is ≤2%. In a nuclear power turbogenerator, the redundancy design increases the fault-free operation time of the excitation system from 8,000 hours to 40,000 hours.

4. In-Depth Compatibility with Power Plant Systems to Simplify Integration and Operation & Maintenance

• IEC 61850 Communication: Supports the MMS protocol and can be directly connected to the power plant's SCADA system. Maintenance personnel can monitor the excitation current, voltage, and fault status in the central control room. In a cross-regional power plant, the headquarters remotely monitors the excitation parameters of 10 generators through the SCADA system, reducing the number of on-site inspections.

• Convenient Software Configuration: The CIMPLICITY software provides a graphical interface, allowing online modification of PID parameters and excitation limit values without shutdown. When adjusting the load of a power plant unit, maintenance personnel adjust the rated value of the excitation current from 800A to 900A through software to meet the unit capacity expansion requirements.

• Historical Data Analysis: The built-in data storage function allows exporting historical excitation parameters for evaluating the health status of the motor (such as early warning of winding aging through abnormal excitation current trends). In an old generator, historical data analysis predicts the insulation aging of the excitation winding 3 months in advance, avoiding sudden faults.