UFC760BE142 ABB 接口板

UFC760BE142 ABB 

基本信息

产品编号:UFC760BE142 ABB 

ABB型号名称:UF C760 BE142: INU

目录说明:uF C760 BE142: INU;接口板

详细描述:UF C760 BE142: INU

类别

零件和服务”驱动器》服务》备件和消耗品》零件

UFC760BE142 3BHE004573R0142该系统能方便地实现对多路信号的采集，并采用频率跟踪技术消除电网基波频率波动时的影响，简化了外围电路硬件，大大提高了数据采集的精度和可靠性。另外还给出它在同步发电机励磁调节器中的应用实例。关键词:锁相环单片机外设服务器(pts）交流采样随着电力系统的快速发展，电力网容量不断增大，结构日趋复杂，电力系统中自动化设备的运用越来越广泛，而数据采集环节则是实现自动化的重要环节。根据采样信号的不同，采样可分为直流采样和交流采样。

UFC760BE142 3BHE004573R0142直流采样采集通过电量变送器整流后的直流量，这种方法软件设计简单，计算方便，便于滤波，对采样值只需作—次比例变换即可得到被测量的数值，采样周期短;但它不能及时反映被测量的突变，有较大的时间常数，测量谐波有误差，投资较大，维护复杂，因而在电力系统中的应用受到限制。交流采样直接对变换好的5v(或0~5v)交流信号进行采样，主要优点是实时性好、相位失真小、投次少、便于维护;其缺点是算法复杂、精度难以提高。但是随着微机技术和微电子技术的高速发展，交流采样以其优异的性能价格比，呈现出逐步取代直流采样的超势。

在大部分由单片机构成的数据采集系统中，通过定时中断的方式对工频50hz的电压信号进行均匀采样。由于电网中频率波动和谐波分量的存在，普通中断时，cpu要执行保持断点转入中断服务、保护现场、恢复现场、返回等一系列操作，cpu开销较大。这样在cpu任务较重或采样数据较多时，对被测量和精度和准确度都有一定的影响。

UFC760BE142 ABB 接口板

UFC760BE142 ABB

Basic information

Product Number :UFC760BE142 ABB

ABB Model name :UF C760 BE142: INU

Catalog description :uF C760BE142: INU; Interface board

Detailed description :UF C760 BE142: INU

category

Parts and Services "Drive" Services "Spare Parts and Consumables" parts

UFC760BE142 3BHE004573R0142 The system can easily realize the acquisition of multi-channel signals, and adopts frequency tracking technology to eliminate the influence of fundamental wave frequency fluctuations in the power grid, simplifies the peripheral circuit hardware, and greatly improves the accuracy and reliability of data acquisition. An example of its application in the excitation regulator of synchronous generator is also given. With the rapid development of power system, the capacity of power network is increasing, the structure is becoming more and more complex, the use of automation equipment in power system is more and more extensive, and the data acquisition link is an important link to achieve automation. According to the different sampling signal, sampling can be divided into DC sampling and AC sampling.

UFC760BE142 3BHE004573R0142 DC sampling collection through the power transmitter rectified direct flow, this method of software design is simple, easy to calculate, easy to filter, the sampling value only need to make a proportional transformation to get the measured value, the sampling period is short; However, it can not reflect the sudden change measured in time, has a large time constant, the measurement of harmonic error, large investment, complex maintenance, so its application in the power system is limited. Ac sampling directly samples the converted 5v(or 0~5v) AC signal, the main advantages are good real-time, small phase distortion, less frequency, easy maintenance; Its disadvantage is that the algorithm is complicated and the accuracy is difficult to improve. However, with the rapid development of microcomputer technology and microelectronics technology, AC sampling has gradually replaced DC sampling with its excellent performance-to-price ratio.

In most of the data acquisition system composed of single chip microcomputer, the voltage signal with power frequency 50hz is uniformly sampled by the way of timing interrupt. Due to the frequency fluctuations and harmonic components in the power grid, the cpu has to perform a series of operations such as maintaining the breakpoint into the interrupt service, protecting the site, restoring the site, and returning during the ordinary interruption, which has a high cpu overhead. In this way, when the cpu task is heavy or the sampling data is large, it has a certain impact on the precision and accuracy of the measurement.