METSO A413659

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描述

METSO A413659

 35kV及以下电压等级的电缆都采用两端接地方式，这是因为这些电缆大多数是三芯电缆，在正常运行中，流过三个线芯的电流总和为零，在铝包或金属屏蔽层外基本上没有磁链，这样，在铝包或金属屏蔽层两端就基本上没有感应电压，所以两端接地后不会有感应电流流过铝包或金属屏蔽层。但是当电压超过35kV时，大多数采用单芯电缆，单芯电缆的线芯与金属屏蔽的关系，可看作一个变压器的初级绕组。当单芯电缆线芯通过电流时就会有磁力线交链铝包或金属屏蔽层，使它的两端出现感应电压。感应电压的大小与电缆线路的长度和流过导体的电流成正比，电缆很长时，护套上的感应电压叠加起来可达到危及人身安全的程度，在线路发生短路故障、遭受操作过电压或雷电冲击时，屏蔽上会形成很高的感应电压，甚至可能击穿护套绝缘。此时，如果仍将铝包或金属屏蔽层两端三相互联接地，则铝包或金属屏蔽层将会出现很大的环流，其值可达线芯电流的50%–95%，形成损耗，使铝包或金属屏蔽层发热，这不仅浪费了大量电能，而且降低了电缆的载流量，并加速了电缆绝缘老化，因此单芯电缆不应两端接地。[个别情况（如短电缆或轻载运行时）方可将铝包或金属屏蔽层两端三相互联接地。然而，当铝包或金属屏蔽层有一端不接地后，接着带来了下列问题：当雷电流或过电压波沿线芯流动时，电缆铝包或金属屏蔽层不接地端会出现很高的冲击电压；在系统发生短路时，短路电流流经线芯时，电缆铝包或金属屏蔽层不接地端也会出现较高的工频感应电压，在电缆外护层绝缘不能承受这种过电压的作用而损坏时，将导致出现多点接地，形成环流。

产品承诺：
保 证 全新原装进口,
保 证 安全准时发货，
保 证售后服务质量，
优势价格，大量现货。

主营DCS系统配件
机器人系统配件
大型伺服系统配件
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Triconex Siemens Yaskawa ABB GE Ovation AB Foxboro Motorola Schneider XYCOM KUKA   专业销售进口DCS  PLC系统备件模块 15天包退换 一年质保 大量现货  国内实力库存商家

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15天包退换 一年质保 大量现货  国内实力库存商家


选择深圳长欣，选择放心，售后无忧大量现货，当天顺丰发货！
主营：本特利，英维思，伍德沃德，福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐，ACSO，力士乐等各大品牌的DCS系统配件，机器人系统配件，大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”（不管能不能看懂，先了解个大概，以便学习编程时查找）；
2、由位控逻辑入手，逐渐增加定时、计数等条件，把或、与、非关系理顺；
3、进而练习整数运算、实数运算、类型转换；
4、量程转换、PID调节回路的建立及P、I、D参数的理解（最好是有个物理回路验证，比如变频器+电机+测速传感器）；
5、循环、顺序、跳转等程序控制（尽量避免跳转，非跳不可时也是跳的越近越好）；
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列，GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌，由于PLC的基本框架大同小异，学会一种至于其它的学习起来也就简单了。

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