文档介绍:several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measuremen± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured1
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
第1章 绪 论
课题背景
当今,自动化控制系统已在各行各业得到广泛的应用和发展,而自动调速控制系统的应用在现代化生产中起着尤为重要的作用,直流调速系统是自动控制系统的主要形式。
由可控硅整流装置供应可调电压的直流调速系统(简称KZ—D系统)和旋转变流机组及其它静止变流装置相比,不仅在经济性和可靠性上有很大提高,而且在技术性能上也显示出较大的优越性。
可控硅虽然有许多优点,但是它承受过电压和过电流的能力较差,很短时间的过电压和过电流就会把器件损坏。为了使器件能够可靠地长期运行,必须针对过电压和过电流发生的原因采用恰当的保护措施。为此,在变压器二次侧并联电阻和电容构成交流侧过电压保护;在直流负载侧