1797-RPFM

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描述

1797-RPFM

根据名称不难发现，交直流电源串扰成因很大一部分原因，就是这种继电保护是由交流电和直流电共同供电，因为在现在的变电站，所用的电气设备以及一些用电装置都是需要二者共同供电的，这也是提高变电所供电可靠性和效率的最好方法。稍微懂一些电力方面知识的人就会知道，交流电的容量要比直流电小得多，并且直流电的可靠性要优于交流电，因此一般的电力方面的公司都比较喜欢应用直流电源，还有一方面就是因为直流电要容易维修。交流电和直流电的作用也是不一样的，因为交流电的功率是比较小的，所以多用于照明设备、打印机这样简单的设备中，所占用的空间不大，所起到的作用也不大，但却必不可少。因此在继电设备中必须要应用两者，因此当进行了一些不当的操作之后，在交流回路和直流回路中的一些线圈等会有不良的反应，会发生电压升高的情况，进而对其他的直流回路设备产生影响，进而干扰到正确的操作，当断路器断开时，如果发现所受到的电压为为无限大，则可以断定这个断路器是理想的，振频一般就是一千赫兹，虽然这种情况会仅仅发生在线圈上，又或者简单的引线上，但是却有可能发生更大的危险，那就是尖峰电压会升高，变得超出承受范围。另一方面，如果没有应用理想断路器，那么所产生的危险就会更大：当断路器断开时，所在的触点位置会会产生电弧重燃现象，在这种情况下会产生过电压，这种过电压虽然是暂态的，但却非常严重，因为它会直接传输到直流部分的母线上，进而使整个断路设备瘫痪。上面所说的情况，当断路器断开时，会产生暂态的过电压，当这个电压超过了击穿电压时，重燃的电弧会导致电流发生变变化，变得时断时续，而电容的充电也会发生影响，变得时断时续，有时还会发生反向放电的情况，使得暂态过电压的震荡变得更加明显，加剧了断路器的稳态的流失，整个控制系统进入瘫痪状态。

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Agilestar – DWDM-X2-42.94 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-43.73 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-44.53 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-46.12 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-46.92 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-47.72 40km -For Cisco- 10GBASE-DWDM

Agilestar – DWDM-X2-48.51 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-50.12 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-50.92 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-51.72 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-52.52 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-54.13 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-56.55 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-58.17 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-58.98 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-59.79 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-X2-60.61 40km- For Cisco -10GBASE-DWDM

Agilestar – DWDM-XENPAK-30.​33 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-31.​12 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-31.​90 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-32.​68 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-34.​25 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-35.​04 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-35.​82 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-36.​61 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-38.​19 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-38.​98 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-39.​77 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-40.​56 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-42.​14 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-42.​94 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-43.​73 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-44.​53 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-46.​12 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-46.​92 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-47.​72 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-48.​51 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-50.​12 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-50.​92 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-51.​72 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-52.​52 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-54.​13 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-54.​94 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-55.​75 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-56.​55 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-58.​17 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-58.​98 40km – Cisco – New in Box

Agilestar – DWDM-XENPAK-59.​79 40km – Cisco – New in Box

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Agilestar – AT-XPER80 – For use in Allied Telesis – NIB

Agilestar – XFP-10GE-ZR – For Redback – 10GBase-ZR

Agilestar – I-MGBIC-GZX – For Enterasys Networks – NIB

Agilestar – DWDM-XFP-44.53 40km- For Cisco – New in Box

Agilestar – DWDM-XFP-46.92 40km- For Cisco – New in Box

Agilestar – DWDM-XFP-58.98 40km- For Cisco – New in Box

Agilestar – DWDM-XFP-55.75 40km- For Cisco – New in Box

Agilestar – DWDM-XFP-54.94 40km- For Cisco – New in Box

Agilestar – DWDM-XFP-54.13 40km- For Cisco – New in Box

Agilestar – DWDM-XFP-47.72 40km- For Cisco – New in Box

Agilestar – DWDM-XFP-46.12 40km- For Cisco – New in Box

Agilestar – DWDM-XFP-43.73 40km- For Cisco – New in Box

Agilestar – DWDM-XFP-42.14 40km- For Cisco – New in Box

Agilestar – DWDM-XFP-40.56 40km- For Cisco – New in Box

Agilestar – DWDM-XFP-36.61 40km- For Cisco – New in Box

Agilestar – DWDM-XFP-30.33 40km- For Cisco – New in Box

Agilestar – ONS-XC-10G-I2 – For Cisco – NIB

Agilestar – AA1419071-E6 – For Nortel – New in Box

Agilestar – DS-X2-FC10G-SR – For Cisco – NIB

Agilestar – ONS-SI-GE-ZX – For Cisco – New in Box

Agilestar – XFP-10G-ER40 – For Alcatel-Lucent – NIB

Agilestar – 1184560P5 – For use in Adtran – New in Box

Agilestar – OM-10GNI-ER – For Alcatel-Lucent – NIB

Agilestar – 808-38613-AS – For IMC Networks – New in Bo

Agilestar – DS-CWDM4G1470-A​S – For Cisco – New in Box

Agilestar – DS-CWDM4G1490-A​S – For Cisco – New in Box

Agilestar – DS-CWDM4G1510-A​S – For Cisco – New in Box

Agilestar – DS-CWDM4G1530-A​S – For Cisco – New in Box

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Agilestar – DS-CWDM4G1590-A​S – For Cisco – New in Box

Agilestar – DS-CWDM4G1610-A​S – For Cisco – New in Box

Agilestar – OC192-XFP-IR2-A​S – For Foundry – New in Box

Agilestar – AS-1FE-BD-10 – For Agilestar – New in Box

Agilestar – AS-1FE-BD-20 – For Agilestar – New in Box

Agilestar – AS-1FE-BD-30 – For Agilestar – New in Box

Agilestar – AS-1FE-BD-40 – For Agilestar – New in Box

Agilestar – AS-1FE-BD-60 – For Agilestar – New in Box

Agilestar – AS-1FE-BD-80 – For Agilestar – New in Box

Agilestar – AS-1FE-BU-10 – For Agilestar – New in Box

Agilestar – AS-1FE-BU-20 – For Agilestar – New in Box

Agilestar – AS-1FE-BU-30 – For Agilestar – New in Box

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Agilestar – AS-1FE-BU-60 – For Agilestar – New in Box

Agilestar – AS-1FE-BU-80 – For Agilestar – New in Box

Agilestar – AS-1GE-BD-10 – For Agilestar – New in Box

Agilestar – AS-1GE-BD-20 – For Agilestar – New in Box

Agilestar – AS-1GE-BD-30 – For Agilestar – New in Box

Agilestar – AS-1GE-BD-40 – For Agilestar – New in Box

Agilestar – AS-1GE-BD-60 – For Agilestar – New in Box

Agilestar – AS-1GE-BU-10 – For Agilestar – New in Box

Agilestar – AS-1GE-BU-20 – For Agilestar – New in Box

Agilestar – AS-1GE-BU-30 – For Agilestar – New in Box

Agilestar – AS-1GE-BU-40 – For Agilestar – New in Box

Agilestar – AS-1GE-BU-60 – For Agilestar – New in Box

Agilestar – AA1403003-E5 – For Nortel – New in Box

Agilestar – 15454-GBIC-30-3 – For Cisco – New in Box

Agilestar – 15454-GBIC-31-1​- For Cisco – New in Box

Agilestar – 15454-GBIC-31-9​- For Cisco – New in Box

Agilestar – 15454-GBIC-32-6​- For Cisco – New in Box

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Agilestar – 15454-GBIC-43-7​- For Cisco – New in Box

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Agilestar – 15454-GBIC-46-1​- For Cisco – New in Box

Agilestar – 15454-GBIC-46-9​- For Cisco – New in Box

Agilestar – 15454-GBIC-47-7​- For Cisco – New in Box

Agilestar – 15454-GBIC-48-5​- For Cisco – New in Box

Agilestar – 15454-GBIC-50-1​- For Cisco – New in Box

Agilestar – 15454-GBIC-50-9​- For Cisco – New in Box

Agilestar – 15454-GBIC-51-7​- For Cisco – New in Box

Agilestar – 15454-GBIC-54-1​- For Cisco – New in Box

Agilestar – 15454-GBIC-54-9​- For Cisco – New in Box

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Agilestar – 15454-GBIC-58-1​- For Cisco – New in Box

Agilestar – 15454-GBIC-58-9​- For Cisco – New in Box

Agilestar – 15454-GBIC-59-7​- For Cisco – New in Box

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Agilestar – 3HE00070AA – For Alcatel-Lucent – NIB

Agilestar – 3HE00070AB – For Alcatel-Lucent – NIB

Agilestar – 3HE00070AC – For Alcatel-Lucent – NIB

Agilestar – 3HE00070AD – For Alcatel-Lucent – NIB

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Agilestar – 3HE00070AH – For Alcatel-Lucent – NIB

Agilestar – 3HE00045AA-AS – For Alcatel – New in Box

Agilestar – 10112 – For Extreme Networks – New in Box

Agilestar – 10113 – For Extreme Networks – New in Box

Agilestar – F5UPGXFPEROPR-A​S – For F5 Networks – New in

Agilestar – XENPAK-1XGE-ER – Juniper – New in Box

Agilestar – 15454-GBIC-52-5​- For Cisco – New in Box

Agilestar – SU69CC-AS – For Marconi – XFP 10GBASE-ER SM

Agilestar – AS-XFP-10G-ER – For Agilestar – New in Box

Agilestar – SFP-GIG-EXTND – For Alcatel-Lucent – NIB

Agilestar – SFP-GIG-47CWD60 – For Alcatel-Lucent -NIB

Agilestar – SFP-GIG-49CWD60 – For Alcatel-Lucent -NIB

Agilestar – SFP-GIG-51CWD60 – For Alcatel-Lucent -NIB

Agilestar – SFP-GIG-53CWD60 – For Alcatel-Lucent – NIB

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Agilestar – SFP-GIG-57CWD60 – For Alcatel-Lucent – NIB

Agilestar – SFP-GIG-59CWD60 – For Alcatel-Lucent – NIB

Agilestar – SFP-GIG-61CWD60 – For Alcatel-Lucent -NIB

Agilestar – SF2G-LX3-5C-47-​AS – For FibroLAN – New in B

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Agilestar – SF2G-LX3-5C-61-​AS – For FibroLAN – New in B

Agilestar – XFP-10G-E-OC192​-IR1 – Juniper – New in Box

Agilestar – 10G-XNPK-ER – For Foundry Networks – NIB

Agilestar – 3CXENPAK96 – For use in 3Com – 10GBASE-ER

Agilestar – 1184560P1 – For use in Adtran – New in Box

Agilestar – AS-X2-10G-ER – For Agilestar – New in Box

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Agilestar – SU69CA-AS – For Marconi – XFP 10GBASE-LR SM

Agilestar – 10GBASE-ER-XFP – Enterasys Networks – NIB

Agilestar – E1MG-BXD-40KM-A​S – For Foundry – New in Box

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Agilestar – 15454-GBIC-1470 – For Cisco – New in Box

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Agilestar – AS-SFP10G-ER – For Agilestar – New in Box

Agilestar – FTLX1612M3BTL – For Finisar – New In Box

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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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