CONTEC MB-486(PS)

CONTEC MB-486(PS)
CONTEC MB-486(PS)
CONTEC MB-486(PS)

宝钢二期烧结工程主排风机设备1991年投入运行。主排风系统由2台21000m3 /min风量，1 7 . 6 4 k Pa (1800mmWG)静压差的双入离心式风机机组组成，主拖动电机为 2×7800kW，10kV无刷励磁同步电动机，2台电机共用一套3.4MVA变频软起动装置起动。该装置1991年投产以来，故障较多，启动成功率低。其主要原因是装置设计容量偏小，系统老化，参数漂移。随着宝钢生产节奏的进一步加快，对烧结矿生产的要求越来越高，为确保烧结生产的稳定运行，基于2DL主排风机起动装置及励磁装置的实际现状，对其进行整体改造的确势在必行。
　　二、改造范围简述
　　本改造项目不涉及主排风机本体及油泵、风门等辅机设备。对目前使用状况尚好的为辅机及辅助设备供电、控制服务的MCC柜以及关联二烧结主控制系统的远程I/O柜予以保留利用。
　　对于10kV的高压开关，保留，能源部设置的辅助继电器、原有中继端子柜也予以保留。
　　高压变频装置、励磁柜、操作控柜拟引进设备，对其进行整体更换。与变频装置配套的输入、输出变压器则由外商提供详细技术参数及制造要求，由宝钢方面择优从内制造厂订货，变压器采用油浸式变压器。
　　考虑到本改造项目新上一套主排风机起动装置及励磁系统，而且在新系统安装调试好以前，老系统还要能运行使用，要求新系统电机空载或带风机负荷调试只能利用2DL年修的七天左右时间完成。当新系统调试过程中出现问题，不能如期接班时，还需老系统作为后备，维持2DL的正常生产。
　　新起动系统10kV运行总线的两路旁路开关到二台同步电动机的馈电，接至老系统运行总线下的两路旁路开关，主排风机室电动机那段电缆仍用旧有电缆。新老系统试车或运行需重接高压柜的高压电缆进行相互切换。
　　原有老系统的励磁柜、操作控盘拆除后，不再恢复。而新装的本次引进系统之励磁柜及操作、控制、视盘将要兼顾新老系统，这部分设备做成与新老系统兼容且具双向切换功能。
装置特点
　　本高压变频器作为软起动器可以连续起动，起动时间小于200秒，起动电流不超过电机的额定电流。该产品特点为：
　　可靠性高。该产品采用6500V,1500A 的高压SGCT器件，器件数量少，耐压及电流裕量大，变频电流小，器件开关损耗少，设备可靠。
　　输入波形好。变频整流器采用多脉冲形式(18脉冲)，总体谐波畸变THD小于 5%，直接满足IEEE519-1992及标的谐波标准。
　　输出波形好。无需增加任何选项， PWM电流型变频器直接输出完正弦波形，不存在转矩脉动，无潜在共振问题。逆变时无dv/dt及di/dt的产生，谐波畸变THD小于5%，连接变频器及电机之间的距离可长达15km。
　　起动性能好。PowerFlex7000采用直接矢量控制技术，本方案选用无编码器的矢量控制，转子的位置可直接检测，起动力矩为95%额定起动转矩。
　　使用简单。人机接口为大屏幕液晶显示操作员终端。变频器的状态，输入输出变量，自诊断结果，故障报等信息均可显示在屏幕上。
　　维护方便。高集成度的SGCT器件及 PowerCage机架的使用提高了系统模块化程度，从而保证了功率模块的更换时间小于5分钟。

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