ABB  UFC760BE143 3BHE004573R0143 模拟输入

【产品详情】

UFC760BE142 3BHE004573R0142 ABB UFC760BE选用高质量的电子元件和材料：在设计和制造模拟输入/输出模块时，选用高质量的电子元件和材料可以保证模块的稳定性和可靠性。例如，选用具有高精度、低噪声、低失真等特点的电子元件，可以优化模块的性能。

UFC760BE143 3BHE004573R0143在发电机机端故障如短路、 错误同期和/或异步运行时产生感应的负励磁电流， 该电流可能在励磁回路中引起高电压。这样的过电压必须限制在一个对励磁线圈的绝缘电压(试 验电压)和整流可控硅的 PIV(峰值反向电压)值足够安全的范围内。为此通常采用所谓的 CROWBAR 电路。CROWBAR 电路采用转折二极管检测励磁回路中的正和负的过电 压。无论何时动作，触发相关的可控硅，立即连接非线性磁场保护电阻与转子并联。

ABB  UFC760BE143 3BHE004573R0143 模拟输入

【英文介绍】

UFC760BE142 3BHE004573R0142 ABB UFC760BE Selection of high quality electronic components and materials: When designing and manufacturing analog input/output modules, the selection of high quality electronic components and materials guarantees the stability and reliability of the modules. For example, the selection of electronic components with high precision, low noise, low distortion and other characteristics can optimize the performance of the module.

UFC760BE143 3BHE004573R0143 Negative excitation current induced by generator side faults such as short circuit, error synchronism and/or asynchronous operation, which may cause high voltage in the excitation circuit. Such overvoltages must be limited to a range that is safe enough for the insulation voltage (test voltage) of the excitation coil and the PIV(peak reverse voltage) value of the rectified thyristor. The so-called CROWBAR circuit is often used for this purpose. The CROWBAR circuit uses a transition diode to detect positive and negative overvoltages in the excitation circuit. Whenever it is activated, the associated thyristor is immediately connected to the nonlinear magnetic field protection resistor in parallel with the rotor.

ABB  UFC760BE143 3BHE004573R0143 模拟输入

【其他型号推荐】

UFC760BE142 3BHE004573R0142 ABB UFC760BE Selection of high quality electronic components and materials: When designing and manufacturing analog input/output modules, the selection of high quality electronic components and materials guarantees the stability and reliability of the modules. For example, the selection of electronic components with high precision, low noise, low distortion and other characteristics can optimize the performance of the module.

UFC760BE143 3BHE004573R0143 Negative excitation current induced by generator side faults such as short circuit, error synchronism and/or asynchronous operation, which may cause high voltage in the excitation circuit. Such overvoltages must be limited to a range that is safe enough for the insulation voltage (test voltage) of the excitation coil and the PIV(peak reverse voltage) value of the rectified thyristor. The so-called CROWBAR circuit is often used for this purpose. The CROWBAR circuit uses a transition diode to detect positive and negative overvoltages in the excitation circuit. Whenever it is activated, the associated thyristor is immediately connected to the nonlinear magnetic field protection resistor in parallel with the rotor.