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DB52A-AR12FB11GE20

DB52A-AR12FB11GE20

发布时间:2019-01-14 14:34:01点击率:

所属行业:五金工业品-> 电子电工-> 电子材料
价格:¥2111
规格:DB52A-AR12FB11GE20
供货总量:1

DB52A-AR12FB11GE20

DB52A-AR12FB11GE20

DB52A-AR12FB11GE20

DB52A-AR12FB11GE20

DB52A-AR12FB11GE20

当下级配线采用限流型断路器时,上级进线承受的短路电流与限流系数有关,限流系数越小,短路电流作用就会越小,线路的动作时间则会越长。故电流-脱扣特性曲线为反时限特性,这样增强了配线与进线的选择性保护特性。

1.4逻辑选择性《联系人;欧先生》
《座机:0592-5709825》
《传真:0592-5917519》
《24小时热线:18030229053微信同步》
《QQ :2479261344》
《QQ邮箱:2479261344@qq》

逻辑选择性,又叫做区域选择性联锁。逻辑选择性保护的实现以上下级断路器都具有通信功能和智能化功能为前提。逻辑选择性的工作程序如下:1)下级断路器发生故障并检测到故障后,向上级断路器发送信号,使其不脱扣;2)上级断路器接收到不脱扣指令,并执行指令,保持不脱扣;3)下级断路器跳闸动作,切除故障电源;4)上级断路器保持闭合,或者在设定时间内下级断路器不脱扣的情况下,进行脱扣。以下图1为例。


                       

其工作原理为:1)断路器CB2的出线发生故障时,CB2断路器断开,将故障切除。2)断路器CB2发生故障时,断路器CB2的脱扣器自动向上级断路器CB1的脱扣器发出信号,使CB1由原来整定的脱扣时间改为延时时间,倘若超过了延时时间,断路器CB2仍然不跳闸,此时断路器CB1发生跳闸切除故障。3)如果断路器CB2发生故障后的故障电流远远大于其承受能力,断路器CB1无论收到CB2的信号与否,都即刻跳闸切除故障。

1.5能量选择性

能量选择性,是指以具有限流能力的上下级断路器为基础,利用脱扣器灵敏的脱扣性能反应线路的短路能量,实现选择性保护的技术。当发生故障,上下两级断路器均检测到大电流时,下级断路器具有很快的限流速度,使得短路能量低于上级断路器实现脱扣动作的能量,从而上级断路器无法动作。由上下级断路器的能量曲线可知,实现能量选择性的条件是:下级断路器的短路能量曲线低于上级断路器。

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联系方式
姓名:  欧工
部门:  销售部
职位:  销售
电话:  
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地址:  福建厦门市厦门市思明区嘉禾路293号宝达大厦1003室
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