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DSQC1018 3HAC050363-001

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DSQC1018 3HAC050363-001
 
DCS一体化实现多种功能,有许多好处,例如,维护方便,备品备件减少,信息共享快速、可靠,人机界面统一等等,DCS功能最早包括DAS、MCS、SCS和FSSS,发展到今天,DCS一体化范围可以进一步扩大。
1) DEH采用DCS系统实现问题,规程中提出二个前提,一是由汽轮机厂负总责,即提
出和审定功能框图和性能要求,并落实与汽机的接口,二是DCS公司有成功应用DCS实现DEH的经验。目前大部分DCS公司已经能满足上述要求了,当然我们仍然不排斥汽轮机厂或DEH专业厂供应专门DEH系统的方案,一般说来,他们经验更丰富一些,当前已经可以方便的解决DCS与DEH间双向冗余通讯,实现用DCS操作员站作为单一人机界面(个别情况下,对于控制信号可以采用硬接线实现)。
2) ETS纳入DCS问题。经历这一段实践DCS可信度大大提高,已有一些工程成功的
将ETS纳入DCS,但必须注意ETS的控制器处理周期不应大于50ms,最好在20-30ms间。另外应采用独立的冗余控制器,以尽可能提高可靠性。最近国家电力公司组织审查《老厂自动化技术改造导则》时,决定宜采用独立控制器改为应采用独立控制器。
3) 自动同期装置(ASS)纳入DCS问题。早期电气控制纳入DCS时,由于缺乏经验,
仅把发变组和厂用电的顺控系统(SCS G/A)纳入DCS,规定自动同期装置(ASS)、自动励磁调节装置(AVR)和发电机保护系统不纳入DCS,经过四、五年实践SCS G/A 纳入DCS无论从管理上和技术上均已成熟,取得成功应用经验。关于ASS装置,目前已有DCS公司有将其纳入DCS的技术,因此,在审查老厂技改导则时,将相关条文改为,当DCS的公司有将其纳入DCS的成功应用经验时,也可将ASS纳入DCS,这充分体现了技术发展时规程也要跟着变化的思想,防止规程成了束缚技术发展的框框。
 
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