基于GTO器件特性和故障状态下gto的过流工况，研究了GTO过流分级快速保护模式和实现方法以及保护的极限条件。
GTO over current rapid protection by gradation mode and limited protection conditions are studied based on the features of GTO and over current situation under fault state.
分析在弯曲工况、制动工况、转弯工况和扭转工况下的应力与变形状态，对应力集中位置结构提出改进方案。
Do research on the stress and deformation state in the condition of bending, braking, turning and reversing, and then make a program that improves the structure of the frame.
九点控制器将偏差-偏差变化率平面图划分为九个工况点，对象运行状态进入不同点时，随之产生不同的控制策略。
The nine point controller divides the graph of deviation and deviating rate into nine state points. It will accept different controlling strategy when object moves into different point.
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