To avoid unnecessary performance penalties , attributes of the display proxy are not processed until the object is expanded , either through the user clicking the plus sign next to the type in a data window , or through the application of the 为了避免不必要的性能损失,显示代理的属性将在展开对象(可通过用户在数据窗口中单击类型旁的加号( + ) ,或通过应用
To avoid unnecessary performance penalties , expression evaluators should not examine the attributes on the display proxy of the type unless the type is expanded , either through the user clicking the plus sign next to the type in a data window , or through the application of the 为避免不必要的性能损失,表达式计算器不应通过以下两种方式来检查类型的显示代理上的属性(除非该类型已展开) :通过用户单击数据窗口中类型旁边的加号( + ) ,或通过应用
The thesis presents an idea for designing a general append & edit control by using object oriented programming method and data window technology and considering data integrality and various practical demand , which is realized by programming as a controller under the pb environment 摘要本文采用面向对象的程序设计思想和数据窗口技术,并考虑到数据完整性和多种实际需要,提出了一个通用录入与编辑控件的设计思想,并在pb环境下完成了实际控件的编程实现。
Applying relative arithmetic to all kinds of faults and calculating off - line , we can master time - distance relation chart for all kinds of faults . computation indicates : when transmission lines occur faults , the data window of protection algorithm consisting of prefault and postfault data at the same time has important significance . the following methods are useful to achieve the inverse time characteristic : calculating impedance by using flourier in a full cycle , calculating work voltage by using fault component , calculating the torque created by a phase comparator or a magnitude comparator 实际的计算表明:输电线路发生故障后,用故障前后的数据同时充满保护算法的数据窗,对于快速切除近区故障具有很重要的意义;同时利用故障前后的数据,下述方法可以比较好地实现距离保护的反时限特性:直接用全周傅里叶算法进行阻抗计算;采用工频变化量阻抗继电器进行工作电压的计算;采用转矩的思想进行转矩的计算。
As the kernel of software , the algorithm is another emphasis of the paper ' s works . based on the principle of relaying working , after comparing the effect between the algorithm of instantaneous sampling and the algorithm of vector , the virtue of short data windows and precision action was stood out . and the choice of algorithm with three sampling data was for the reason of short data windows 算法理论作为微机保护的软件核心也是本文的讨论重点,以保护的动作原理为基础,认真研究了采样瞬时值法与一般的矢量值法的效果比较,突出了采样瞬时值法时间窗短、动作准确的优点;而针对低电压闭锁所采用的三采样值积算法也正是出于时间窗较短,便于配合保护动作的考虑。