1746-OAP12

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描述

1746-OAP12

若不止一台变压器时，运行方式往往只允许1-2台接地运行，设计采用中性点零序电流继电器与经相邻变压器中性点零序电流继电器控制的零序电压继电器配合使用的变压器保护方案，保护回路设计先跳中性点不接地变压器，然后中性点跳直接接地的变压器，以防止不接地系统故障点的间歇性弧光过电压危及电气设备的安全。为避免全厂所有变压器全部被切的严重后果，保护时间应逐级配合，先断开母联或分断路器，再经零序电压元件跳开中心点不接地主变，最后经零序电流元件跳开中性点接地主变。对中性点有可能直接接地运行，也有可能不接地运行的主变，因失去接地中性点引起的电压升高，应装设相应的保护装置。在直接接地时用零序电流保护。在中性点不接地时用零序电压保护或装设放电间隙保护，放到间隙保护起到过电压保护的作用，当放电间隙被击穿形成零序电流通路时，利用接在放电间隙回路的零序电流保护，切除该变压器。变压器采用放电间隙保护，放电间隙装于变压器中性点与地线之间、有棒形、球形、角形等多种形式，实际安装中可以棒形用得最多，零序电压保护动作电压按发生单相接地故障时保护安装处可能出现最大零序电压整定。对变压器高压侧中性点直接接地的自耦变压器和三绕组变压器采用零序过电流保护，取自变压器中性点的零序CT安装无方向零序保护，在主变两侧分别装上零序保护，了为满足选择性可增设零序方向元件。方向元件用各断路器侧CT的自产零序电流。主变中性点零序电流互感器的极性接线可以将中性点零序电流保护指向本侧母线或主变侧。采用断路器处的零序电流保护，和一般高中压侧方向指向各自的母线，但当中压侧不无源时，高压侧零序方向可指向主变。指向母线保护的范围以为断路器电流互感器安装处开始，需要与线路零序保护配合。指向主变变压器，需要主变压器另一侧出线的接地保护相配合。采用主变中性点处地零序电流保护，则保护范围比断路器处零序电流保护比要宽一些。小浪底目前运行的主变中性点零序电流保护无方向，这样的整定配合比较清晰方便，一是限制跳开母联断路器，二是限制跳开本侧开关。

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Agilestar – E1MG-100BXD – For Foundry Networks – NIB

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Agilestar – 3HE00868AA – For Alcatel-Lucent – NIB

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Agilestar – E1MG-100BXU – For Foundry Networks – NIB

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Agilestar – SFP-OC48-IR1 – For Cisco – New in Box

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Agilestar – GSFIBER-SFP-30K – Sixnet Networks – NIB

Agilestar – ONS-SI-100-FX – For Cisco – New in Box

Agilestar – HFCT-5760TP – For Aglilent Avago – NIB

Agilestar – HFCT-5760TL – For Aglilent Avago – NIB

Agilestar – E1MG-100FX-IR – For Foundry Networks – NIB

Agilestar – ITV-1KSG-NA-100​G – For use in McAfee – NIB

Agilestar – ITV-1KSG-NA-100​A – For use in McAfee – NIB

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Agilestar – 3HE00024AA – For Alcatel-Lucent – NIB

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Agilestar – MINIGBIC-1000T – For Alcatel-Lucent – NIB

Agilestar – MGBIC-LC05 – For Enterasys Networks – NIB

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Agilestar – OC48-SFP-SR1 – For Foundry Networks – NIB

Agilestar – E1MTG-SX – For Foundry Networks – NIB

Agilestar – SFP-OC48-LR1 – For Foundry Networks – NIB

Agilestar – GPIM-02-C – For Enterasys Networks – NIB

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Agilestar – OAG-SFP-GIG-T – For Alcatel-Lucent – NIB

Agilestar – OAW-GBIC-T – For Alcatel-Lucent – NIB

Agilestar – SFP-OC48-SR – For Cisco – New in Box

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Agilestar – FTLF1324P2BTV-A​S – For Finisar – New in Box

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Agilestar – SFPM1000LZ – For Asante Networks – NIB

Agilestar – 200E-XBR-000077 – For use in Brocade – NIB

Agilestar – 200E-XBR-000083 – For use in Brocade – NIB

Agilestar – 808-38115-AS – For IMC Networks – New in Bo

Agilestar – FCL-8520-3-AS – For Finisar – New in Box

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Agilestar 1.25Gbps SFP Transceiver ONS-SI-GE-ZX-AS
One-day shipping available

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

Agilestar – CWDM-GBIC-1490 – For Cisco – New in Box

Agilestar – CWDM-GBIC-1510 – For Cisco – New in Box

Agilestar – CWDM-GBIC-1530 – For Cisco – New in Box

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Agilestar – CWDM-GBIC-1610 – For Cisco – New in Box

Agilestar – ABCU-5710RZ-MR-​AS – For Agilent-Avago – New

Agilestar – SF1G-LX5C-47-AS – For FibroLAN – New in Box

Agilestar – SF1G-LX5C-49-AS – For FibroLAN – New in Box

Agilestar – SF1G-LX5C-51-AS – For FibroLAN – New in Box

Agilestar – SF1G-LX5C-53-AS – For FibroLAN – New in Box

Agilestar – SF1G-LX5C-55-AS – For FibroLAN – New in Box

Agilestar – SF1G-LX5C-57-AS – For FibroLAN – New in Box

Agilestar – SF1G-LX5C-59-AS – For FibroLAN – New in Box

Agilestar – SF1G-LX5C-61-AS – For FibroLAN – New in Box

Agilestar – ONS-SI-100-LX10 – For Cisco – New in Box

Agilestar – 02312189-AS – For Huawei – New in Box

Agilestar – SFP-OC12-SR-AS – For Cisco – New in Box

Agilestar – AGM733 – For use in Netgear – New in Box

Agilestar – E1G-LH – For Foundry Networks – New in Box

Agilestar – OC12-SFP-IR1 – For Foundry Networks – NIB

Agilestar – OC12-SFP-MM – For Foundry Networks – NIB

Agilestar – J4860C – For HP – New in Box

Agilestar – E1MG-LHA – For Foundry Networks – NIB

Agilestar – 1184544P2 – For use in Adtran – New in Box

Agilestar – NTTP02CD – For Nortel – New in Box

Agilestar – NTTP04BF – For Nortel – New in Box

Agilestar – SFP-OC3-SR – Juniper – New in Box

Agilestar – SFP-OC12-SR – Juniper – New in Box

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Agilestar – SFP-DUAL-MM – For Alcatel-Lucent – NIB

Agilestar – SFP-GE-Z – For Cisco – New in Box

Agilestar – SFP-OC12-IR1 – For Cisco – New in Box

Agilestar – SFP-OC12-LR1 – For Cisco – New in Box

Agilestar – SFP-OC12-SR – For Cisco – New in Box

Agilestar – SFP-OC3-LR1- For Cisco – New in Box

Agilestar – 10058 – For Extreme Networks – New in Box

Agilestar – 10059 – For Extreme Networks – New in Box

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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。

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