引言 变电站自动化系统的功能 变电站自动化的几个关键技术问题 面向对象的变电站通信网络与系统—IEC 61850

2.1兼容制传送方式 2.1.1兼容的必要条件 1所传送的电视信号中应有亮度信号和色度信号两部分。 2彩色电视信号通道的频率特性应与黑白电视通道频率特性基本一致

In the chapter we shall introduce some two-terminal element which have properties, which are quite different than those of the resistor. These elements are the inductor and capacitor. The inductor and capacitor are passive elements, which are capable of storing and delivering finite amounts of energy

In the chapter we present resistive circuit analysis methods. The first is based on KCL and determines all the node-to-datum voltages in a given circuit and is known as node analysis. The second method, based on KVL, determines all loop current and is known as loop analysis. After discussing superposition, we will introduce Thevenin's and Norton's theorems

第一节电力负荷与负荷曲线 第二节三相用电设备组计算负荷的确定 第三节单相用电设备组计算负荷的确定

4.5.1系统设计的原则与基本步骤 4.5.2BAS的组成与系统结构 4.5.3BA的实现方案 4.5.4系统规模的划分 4.5.5组建系统的一般原则 4.5.6BAS的功能要求 4.5.7监控点一览表的编制 4.5.8BAS的电源 4.5.9BAS的接地 4.5.10BAS的线路选择与敷设

1. Establish a normal tree. tree branches--Us, C(, R) cot ree(chords)-i,,(, R) 2. Assign voltage and current variables. Assign a voltage (with polarity reference) to every capacitor and a current(with arrow) to every inductor; there are the state variables. Indicate the voltage across every tree branch and the current through every link in terms of the source voltages, source currents,and the state

The set of variables is a hybrid set that may include both currents and voltages. They are the inductor currents and the capacitor voltages. Each of these quantities may be used directly to express the energy stored in the inductor or capacitor at any instant of time. They collectively describe the energy state of the system. They are called the state variables

3.1概述 3.1.1插补的基本概念 数控系统根据零件轮廓线型的有限信息,计算出刀具的系列加工点、完成所谓的数据“密化”工作。插补有二层意思:

2.1概述 2.1.1数控编程的基本概念 根据被加工零件的图纸及其技术要求、工艺要求等切削加工的必要信息,按数控系统所规定的指令和格式编制数控加工指令序列