STBNIP2311

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描述

STBNIP2311

在电力系统中,接地是用来保护人身及电力、电子设备安全的重要措施。通常我们将接地分为工作接地、系统接地、防雷接地、保护接地,用他们来保护不同的对象,这几种接地形式从目的上来说是没有什么区别的,均是通过接地接地导体将过电压产生的过电流通过接地装置导入大地,从而实现保护的目的。现代工厂在接地上都要求形成一张严密的网,而所有的被保护对象都挂在这个安全的接地网上,但不同的接地都需要从接地装置处的等电位点连接。 对于防雷接地,主要是通过将雷电产生的雷击电流通过接地网这一有效途径引入大地,从而对建筑物起到保护作用。一般有两种避雷方式供选择,其一是避雷针接地,其二是采用法拉第笼方式接地。它们是两种不同的防雷模式,它们在防雷原理上有显著的区别。避雷针的原理是空中拦截闪电、使雷电通过自身放电,从而保护建筑物免受雷击,避雷针的保护范围是从地面算起的以避雷针高度为滚球半径的弧线下的面积,对于法拉第笼,它认为避雷针的范围很小,而且在避雷针保护的空间内仍有电磁感应作用,而且避雷针附近是强的电磁感应区,有很大的电位梯度,在它周围有陡的跨步电压存在,在这一范围内的人们有生命危险,鉴于种种观点,现在的防雷接地系统中法拉第笼占有重要地位。实验证明,一个封闭的金属壳体是全屏蔽的,在雷电流通过时,是沿着壳体的外表面流入大地,而在壳体的内部没有感应电动势及磁通,即雷电流没有对内部的设备产生干扰效应。而法拉第笼下部的环状接地环、等电位均压网也避免了人在此等电位环境中被雷击的危险。

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
品牌:ABB   ,AB  ,GE,FOXBORO,本特利,英维思,伍德沃德,西屋,瑞恩,施耐德,西门子,摩托罗拉,安川。力士乐。ACSO,横河等进口品牌。 专业销售进口DCS  PLC系统备件模块
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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专业销售进口DCS  PLC系统备件模块

PLC模块,可编程控制器,CPU模块,IO模块,AI模块,通讯模块。AB/施耐德/ABB/GE/本特利/西屋/英维斯/霍尼韦尔/黑马/FU克斯波罗

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。