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6DS1603-8BA

电气系统纳入DCS控制水平及技术要求

机组整套启动时从锅炉点火至发电机并网带初始负荷够实现全过程的自动程序控制。(当然可以设有限几个断点人工分析判断决定后介入操作)，或机组停机时DCS能安全停机。
机组自启停控制的要求是：
机组正常起动时，当发电机达到额定转速时，DCS将投入AVR。当发电机电压达到额定值时，DCS将投入同期装置。发电机与电网的同期是由同期装置自动实现，在同期过程中通过DCS控制AVR、DEH，当同期条件满足时，向发电机断路器发合闸指令。在同期合闸成功，发电机电负荷达到一定值之后，DCS将高压厂用电系统快速从启备变切换到高压厂变上。
机组正常停机时，DCS控制降低机组负荷，当机组负荷降到某一定值时，DCS将高压厂用电系统快速切换到启／备变系统供电；当机组负荷继续降到零，跳开主开关，联跳汽轮机(主汽门关闭)，发电机灭磁。
对于厂用电源系统控制的要求是：
在机组启动时通过启／备变向厂用负荷供电；在机组正常用电时，由厂变供电并经低压厂变向400VMCC低压负荷供电以启动机组所必需的辅机；在厂用电消失时，为了保护设备和系统的安全，厂用电快切装置应快速将厂用工作负荷自动切换至启／备变；当确认保安段母线失压后，应启动事故备用柴油机供电以保证设备安全。
依据以上控制水平的要求，电气监控纳入DCS技术的要求是：
（1）发电机系统能实现程序控制和软手操控制使发电机由零起升速、升压直到并网带初始负荷。
（2）厂用电系统能按启动／停止阶段和正常运行阶段的要求程序控制和软手操来实现。
（3）能实时显示和记录上述发变组系统和厂用电系统的正常运行、异常运行和事故状态下的各种数据和状态，并提供操作指导和应急处理措施。
（4）单元机组(炉机电)实现全CRT监控。

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6DS1603-8BA

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