AB&80022-123-33&

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AB&80022-123-33&

电流速断保护、顾名思义、就是指电流发生变化或超过预先设置的保护定值范围时,而瞬间动作的电流保护。书面定义为:对于反应短路电流幅度增大而瞬间动作的电流保护,称为电流速断保护,为了保证其微机保护装置选择性,一般只能保护线路的一路分,假定每天线路上均装有电流速断保护,当线路上发生故障时,希望保护能瞬间动作,他的保护范围最好能达到本线路长的100%,但是这种愿望能否实现,需要作具体分析。
为了解决这个矛盾可以有两种方法,通常都是优先保证动作的选择性,即从保护装置启动参数的整定上保证下一条线路出口短路时不启动,在微机保护技术中,这又称为按躲开下一条线路出口处短路条件整定,另一种办法是在个别情况下,当快速切除故障是首要条件时,用自动重合闸来纠正这种无选择性动作。
电网中电气设备发生故障时,短路电流很大,根据继电器的基本动作原理可知,如果预先通过计算,将此短路电流整定为继电器的动作电流,就可对故障设备进行保护。过电流保护和电流速断保护正是根据这个原理而实现的。为了保证动作的选择性,根据短路电流的特点(故障点越靠近电源,则短路电流越大),过电流保护是带有动作时限的,而电流速断保护则不带动作时限,即当短路发生时,它立即动作而切断故障,故它没有时限特性,常用来和过流保护配合使用。速断保护不能保护线路全长,只能有选择性地保护线路一部分,余下部分为速断保护的死区。为避免上述情况,速断保护也可做成略带时限,称为时限电流速断保护。它和无时限电流速断配合,以消除电流速断保护的动作死区。

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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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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。