BENTLY NEVADA 135473-01

• 型号：135473-01


• 数量：3


• 制造商： 厦门雄霸电子商务有限公司


• 有效期：2020/10/8 0:00:00

BENTLY NEVADA 135473-01

BENTLY NEVADA 135473-01

BENTLY NEVADA 135473-01

在电动机控制接线中，主电路中装有熔断器，为什么还要加装热继电器?它们各起何作用，能否互相代替?而在电热及照明线路中，为什么只装熔断器而不装热继电器?

答:熔断器在电气线路中主要起短路保护和严重过载保护作用，而热继电器主要用于过载保护.两者不能互为代用，但可以互为补充.如果用熔断器作电动机的过载保护，为了防止电动机在启动过程中熔断器熔断，熔断器熔体的额定电流一般应取电动机额定电流的2. 5~3倍，这样即使电动机长时间过负荷50%，熔断器也不会熔断，而电动机可能因长时间过负荷而烧坏.所以不能用熔断器作过负载保护.而热继电器是利用电流的热效应来工作的，由于热惯性的影响，尽管发生短路时电流很大，也不可能使热继电器立即动作，这样就延长了短路故障的影响时间，对供电系统及用电设备会造成危害.所以也不能用热继电器作为短路保护.

对于电热及照明设备，由于负载的性质不同于电动机的拖动负载，一般来说，它们不会出现过负载现象，所以，一般不装备热继电器，而只装备熔断器，主要起短路保护作用.

异步电动机的制动方法有哪些?各自有何特点?速度继电器用于哪种制动方法? 

异步电动机的制动方法一般有两类:机械制动和电气制动。机械制动常用的方法有:电磁抱闸和电磁离合器制动。常用的制动方法有能耗制动、反接制动和回馈制动。

反接制动的优点是:制动力强，制动迅速。缺点是:制动准确性差，制动过程中冲击强烈，易损坏传动零件，制动能量消耗大，不宜经常制动。因此反接制动一般适用于制动要求迅速、系统惯性较大，不经常启动与制动的场合。

能耗制动的优点是制动准确、平稳，且能量消耗较小。缺点是需附加直流电源装置，设备费用较高，制动力较弱，在低速时制动力矩小。所以，能耗制动一般用于要求制动准确、平稳的场合。

回馈制动是一种比较经济的制动方法。制动时不需改变线路即可从电动运行状态自动地转入发电制动状态，把机械能转换成电能再回馈到电网，节能效果显著。缺点是应用范围较窄，仅当电动机转速大于同步转速时才能实现发电制动。

BENTLY NEVADA 330104-00-15-10-02-CN

BENTLY NEVADA 330105-02-12-10-02-00

BENTLY NEVADA 330105-02-12-10-02-05

BENTLY NEVADA 330106-05-30-05-02-00

BENTLY NEVADA 330106-05-30-10-02-00

BENTLY NEVADA 330130-040-03-CN

BENTLY NEVADA 330130-045-00-00

BENTLY NEVADA 330180-51-05

BENTLY NEVADA 330980-51-05

BENTLY NEVADA 330703-000-060-10-02-00

BENTLY NEVADA 330703-00-80-10-02-00

BENTLY NEVADA 330704-000-060-10-02-00

BENTLY NEVADA 330709-000-060-10-02-00

BENTLY NEVADA 330709-000-080-10-02-00

BENTLY NEVADA 330730-040-00-00

BENTLY NEVADA 330780-50-00

BENTLY NEVADA 330500-02-00

BENTLY NEVADA 330850-50-05

BENTLY NEVADA 330851-02-000-070-50-00-05

BENTLY NEVADA 3500/22M 288055-01 L 

BENTLY NEVADA 3500/33

BENTLY NEVADA 3500/40 125672-01

BENTLY NEVADA 3500/40M 176449-01

BENTLY NEVADA 3500/42M

BENTLY NEVADA 176449-02

BENTLY NEVADA 3500/53M

BENTLY NEVADA 3500/65

BENTLY NEVADA 3500/90 125728-01

BENTLY NEVADA 3500/93

BENTLY NEVADA 40113-02

BENTLY NEVADA 74712-01-10-02-00

BENTLY NEVADA 74712-03-10-02-00

BENTLY NEVADA 78462-01

BENTLY NEVADA 84145-01

BENTLY NEVADA 89416-01

BENTLY NEVADA 78432-02

BENTLY NEVADA 82926-0

BENTLY NEVADA 84661-8

BENTLY NEVADA 900800XL-050-04-00

BENTLY NEVADA 9513-XX

BENTLY NEVADA 990-05-50-02-00

BENTLY NEVADA B136703-01

BENTLY NEVADA 176449-01

BENTLY NEVADA 138607-01

BENTLY NEVADA 3500/61

BENTLY NEVADA 330130-040-03-00

BENTLY NEVADA B107540-01A

BENTLY NEVADA 132417-01 135462-01 132419-01

BENTLY NEVADA 21747-080-00

BENTLY NEVADA 3300/12 P/N88219-01

BENTLY NEVADA 3300/20 P/N 135313-01

BENTLY NEVADA 3300/36

BENTLY NEVADA 3300/65

BENTLY NEVADA 330130-070-00-05

BENTLY NEVADA 330180-91-00

BENTLY NEVADA 330854-040-25-CN

BENTLY NEVADA Jan-00

BENTLY NEVADA 3500/05-01-01-00-00-01

BENTLY NEVADA 3500/05-02-02

BENTLY NEVADA 3500/20

BENTLY NEVADA 3500/25

BENTLY NEVADA 3500/33-01-01

BENTLY NEVADA 3500/50M

BENTLY NEVADA 3500/61

BENTLY NEVADA 3500/92-04-01-01

BENTLY NEVADA 3500/93

BENTLY NEVADA 88286-01J(PWA88199-01)

• 电话：0592-5580706/13295922579
• 传真：0592-5361191
• email：LJY_05228@163.com