影响保护选线准确性的关键原因就在于一个“小”。因为接地时的电流很小，从几毫安到几十毫安或几百毫安，也只有几安培，与供电线路中的几百安培或数千安培的负荷电流相比，相差数千倍或数万倍；线路中故障时的电流与非故障时的电流相比没有明显的区别；又因为很多电流互感器的测量误差所产生的不平衡电流远大于接地时的零序电流值，现有的继电保护和综合自动化保护等设备，不能区分是故障接地电流还是负荷电流的波动。1mbi600np-060-03 一般的数控机床都具有锁定功能（全锁或单轴锁）。当输入程序后，锁定z轴，可通过z轴的坐标值判断是否会发生碰撞。此功能的应用应避开换刀等运作，否则无法程序通过，程序编制是数控加工至关重要的环节，提高编程技巧可以在很大程度上避免一些不必要的碰撞。
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电磁理论补充和完善，电子带电理论，物理学上是这样给电荷定义的：把绝缘棒物体与毛发摩擦后，它们都能吸引小纸片等轻微物体。这时毛发和绝缘棒这两个物体都处于带电状态。处于带电状态的物体称为带电体。用绸子摩擦过的玻璃棒带的电荷规定为正电荷，用毛皮摩擦过的橡胶棒带的电荷规定为负电荷。而作者认为它们摩擦后实质上是引力加强了而具有吸引力了。 机器视觉，由于受到数据传输速率的限制，plc平台上不能提供视觉功能。pac的机器视觉可以检测出利用传统的方法很难测量出来的产品缺陷和错误。提高生产率，一个通用的轻便控制引擎和综合工程开发的平台允许快速开发、实施和迁移项目工程；并且，由于它的开放性和灵活性，确保了控制点和操作以及企业业务系统之间的无缝连接，优化了工厂的流程，提高了生产效率。 通用电气公司(ge)的历史可追溯到美国人托马斯?爱迪生(1847-1931)，这位世界闻名的发明家和他的助手发明创造了钨丝电灯泡、留声机、电影摄影机等一千三百多种东西。他一生总共获得1093项发明专利，是实行专利制度以来获得个人专利多的人。1878年，爱迪生创立了爱迪生电灯公司。1892年，爱迪生通用电气公司和汤姆森-休斯顿电气公司合并，成立了通用电气公司(ge)。1900年，ge商标完成注册。ge是自道?琼斯工业指数1896年设立以来至今仍在指数榜上的公司。1mbi600np-060-03 系统中采用ifix软件作为上位机的。ifix作为一种多方面的，提供了与多种plc通讯的i/o驱动程序，可方便的与plc连接，在工业控制领域有着广泛的应用。监控系统包括scada系统和 hmi图形系统。scada系统通过与 plc建立通讯关系通过软件接口i/o驱动程序与plc直接建立通讯来读取数据，并形成实时数据库。hmi图形系统显示实时数据和报警信息，记录历史数据，打印报表，修改设定参数以及实现软手动控制等。
a44-0001-0165#200a 下面将不同容量机组的各类高压变频装置改造后的经济效益做一详细的比较分析，经济效益比较：高压变频装置分布在公司100－600mw的机组上，主要有一次风机、送、吸风机、凝结水泵等。下面将有关经济效益的详细比较分述如下：张家口发电厂#8炉（300mw机组）一次风机张家口发电厂#8锅炉配套的制粉系统为中速磨冷一次风机正压直吹式系统，配备6台zgm95g型中速磨煤机。送风机、吸风机均为上海鼓风机厂生产的动叶调节式通风机。1mbi600np-060-03 从发展区域来说，变频调速技术的应用在我国沿海省份和南方城市发展较快，目前已有向内地快速渗透的趋势，调速范围宽，可以使普通异步电动机实现无级调速；启动电流小，而启动转矩大；启动平滑，消除机械的冲击力，保护机械设备；对电机具有保护功能，降低电机的维修费用；具有显著的节电效果。
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1mbi600np-060-03 目前随着火热的zigbee技术的风起云涌，很多从事zigbee模块和终端产品经营的公司要么是从芯片开发出来的非组网能力的简易产品，要么就是从第三方引进一个相对增加了3--5个跳数、简陋能力的zigbee协议栈定制出的zigbee rs232、zigbee rs485应用模块，用户不需要考虑模块中程序如何运行的,只需要按照手册上提供好的包格式,主要包括数据内容,目的地址这两点,就可以把自己的数据通过串口发送到模块里,然后模块会自动把数据通过无线发送出去。， 当rs232的rts端为逻辑电平0（＋12v）时，光电耦合器的发光二极管发光，光敏三极管导通，输出端为ttl的逻辑电平0（0v），选中rs485接口芯片的re端，容许rs485发送。rs485的r端工作时，当其输出为逻辑电平1时，光电耦合器的发光二极管不发光，光敏三极管不导通，借助rs232输出停止时其txd电平为－12v，电容被充电到－12v，使其输出也为－12v，即逻辑电平1.