51305776-100/51305759-100
51305776-100/51305759-100
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仲鑫达菜谱
主食:AB,施耐德和GE ABB 本特利 英维思 黑马
四菜一汤:AB 1769、1756、1747、1785,
ABB DCS.OCS,GE燃机备件IS200 IS215 DS215,本特利3500系列!
餐后水果:仲鑫达自动化电气
----------------- 厦门仲鑫达自动化设备有限公司 -------------------
为何我公司许多产品的价格更有优势?
(1)源头采购,减少中间环节差价
(2)渠道稳定,货源更有保障
货期问题
(1)库存现货产品,签订合同付款后,当天即可安排发货
(2)订货产品,根据报价货期发货
l Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数据通信及处理等。
l Invensys Triconex: 冗余容错控制系统、基于三重模件冗余(TMR)结构的现代化的容错控制器。
l Westinghouse(西屋): OVATION系统、WDPF系统、WEStation系统备件。
l Rockwell Allen-Bradley: Reliance瑞恩、SLC500/1747/1746、MicroLogix/1761/1763/1762/1766/1764、CompactLogix/1769/1768、Logix5000/1756/1789/1794/1760/1788、PLC-5/1771/1785等。
l Schneider Modicon(施耐德莫迪康):Quantum 140系列处理器、控制卡、电源模块等。
l ABB:工业机器人备件DSQC系列、Bailey INFI 90等。
过压保护装置可由四部分组成:前级高额定(高残压)浪涌保护器,检测模快,动作机构,后级低额定(低残压)浪涌保护器。显而易见这样一来解决了上述矛盾,这里就不细说了。关于动作机构的设计挺有讲究,简要的说需考虑宽范围、能自动恢复等;而这里就重点谈一下检测模快的选型与应用。在此方案中检测模快可以说是核心,选择不当不仅本身的故障率较高,又不能达到方案的预期保护效果。
监测模快的选型与应用
所以该模块需有下列要求:
1.电源直接取自被监视电压,但能承受至少2KV的峰值电压;
2.为适应开关电源的宽范围过压点在275V,恢复点在265V,欠压点在150V,恢复点在160V;
3.保护不要延时,检测到故障及时切断电源;但恢复正常要延时,这样可以使设备避过复杂的过渡过程,如在交流停电到来电,很多设备都在这时刻损坏,因为存在交流停电时好多设备是不断电的,而当来电时好多设备是同时启动,那么此刻的电网的情况就十分复杂。另外雷电也不是一个单一的波,他可能持续一断时间,可以使设备避开后续的雷电波。
4.选用带中心线的电压监测模块动作判定的依据是相电压,只要任一相电压超过正常范围而动作而不是间接的参数线电压,从而有效的保护严重的三相不平衡与相线对地短路引起的过电压。
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