Westinghouse 1C31150G01 此类故障在生产过程中较为常见,主要包括系统设计安装缺陷,控制器(DPU或CPU)的死机、脱网等故障,操作员站黑屏,网络通讯堵塞,软件存在缺陷,系统配置较低,与其他系统及设备接口存在问题等。 2.1.1 电源及接地问题: (1)某电厂DCS电源系统采用的是ABB公司Symphony III型电源,但基建时仍按照II型电源的接地方式进行机柜安装,与III型电源接地技术要求差异很大。机组投产以来发生多次DCS模件故障、信号跳变、硬件烧坏的情况,疑与接地系统有关。同样,某电厂在基建期间DCS接地网设计制作安装存在问题,DCS系统运行后所有热电阻热电偶温度测点出现周期波动。 (2)某厂因电源连线松动而导致汽机侧控制系统失效。 经验教训:DCS没有良好的接地系统和合理的电缆屏蔽,不仅系统干扰大,控制系统易误发信号,还易使模件损坏。可见,UPS电源、控制系统接地等存在问题将给电厂投产后DCS的安全稳定运行留下较大隐患。因此,DCS系统电源设计一定要有可靠的后备手段,负荷配置要合理并有一定余量;DCS的系统接地必须严格遵守制造厂技术要求(如制造厂无特殊说明应按照DLT774规定执行),所有进入DSC系统控制信号的电缆必须采用质量合格的屏蔽电缆,并要同动力电缆分开敷设且有良好的单端接地。 2.1.2 系统配置问题: (1)浙江某电厂DCS(T-ME/XP系统)频繁故障和死机造成机组停运事故。7、8机组(2*330MW),从1997年2月试生产至5月,两台机组共发生22次DCS系统故障和死机,造成机组不正常跳闸8次。之后又多次发生操作画面故障(8号机组有两次发生全部6台操作站“黑屏”),严重威胁机组安全。经分析认为其DCS系统存在以下几个方面的问题:(1)DCS工程设计在性能计算软件、开关量冗余配置上存在问题。(2)硬件配置不匹配(其中包括T-ME和T-XP两种系统的匹配和通信问题)。(3)个别硬件设计不完善。(4)进一步分析,关键的CS275(下层T-ME)通讯总线负荷率过高出现“瓶颈”问题现象。而欧洲T-ME/XP系统用户在配置合理的前提下,T-ME/XP系统使用情况基本良好。 (2)某电厂在200MW机组的热控系统自动化改造上使用的DCS,由于系统配置的负荷率计算不准且为了减少投资,技术指标均接近允许极限,加之该系统有运行时中间虚拟I/O点量大的特点,所以在改造后期调试时发现个别控制器的负荷率竟**过了90%,个别软手操操作响应竟接近1min,根本无法使用,后经过大幅度调整(系统重新增加配置),才解决了这个问题。 ——————————————————————————————————————— 厦门莫格电气自动化有限公司 杨小姐(区域经理) 电话: 传真:0592-3514751(请备注杨工收) Q 邮箱:3443643092@ 诚信经营,质量为首,诚信至上,公司坚持"莫格在用户身边,用户在莫格心中" 的服务宗旨.以一级产品竭诚为广大用户提供优质服务. ——————————————————————————————————————— 【官网/ 【价格】如此低价,**一家 【货期】大量现货,下单后即可发货 【质量】全新原装,进口现货 【**】产品经过专业检测,质保一年,15天包退换 【服务标准】降低客户的停机时间以及维护成本,减少所有的工业机械和生产设备运行故障,延长控制系统的寿命! Phoenix Contact IBS ST 24 BK DIO 8/8/3-T ID-No. 2752411 - sealed - Phoenix Contact IBS ST 24 BK DIO 8/8/3-T ID-No. 2752411 + 2752961 -unused - Phoenix Contact SACB-4Q/4P-L-SC Art.Nr. 1662939 -sealed- Phoenix Contact SACB-4Q/4P-L-SC Art.Nr. 1662939 -Neu/OVP- Phoenix Contact IBS IP 24 RFC/LK/LOOP-T Ord.-Nr. 2722917 -unbenutzt/OVP- Phoenix Contact FL HUB 10BASE-T FLHUB10BASET Phoenix Contact ELR W1/10-24DC 2964306 Phoenix Contact InterBus IB STME 24 BDI 8/4 IBSTME24BDI8/4 Phoenix Contact MCR-SL-S-1/5-I-DCI-24 Id.-No. 2814812 Phoenix Contact MCR-R/I-4-V-DC Id.-No. 2769653 Phoenix Contact MCR-C-UI-UI-DCI Trennverst?rker Ord.-Nr. 2810913 -used- Phoenix Contact IBS IL 24 BK-LK IBSIL24BKLK Phoenix Contact IBS IL 24 BK-LK IBSIL24BKLK Phoenix Contact Kaleja M-2Q-6-30S 06.04.021S Phoenix Contact CM 90-PS-230AC/2x15DC/1 Art.-Nr. 2953806 Power-Supply - used - Phoenix Contact IB IL 24 DO 4 Ord.-Nr. 2726256 - gebraucht Phoenix Contact IB IL 24 DI 4 Ord.-Nr. 2726214 - used - Phoenix Contact EMD-SL-C-UC-10 Order Nr. 2867937 Phoenix Contact PSR-ESM4 PSR-SPP- 24UC/ESM4/2X1/1X2 Order Nr. 2963705 Phoenix Contact PSR-SPP- 24UC/URM4/5X1/2X2 Order-Nr. 2964005 Phoenix Contact PSR-SPP- 24DC/ESD/5X1/1X2/0T5 Order-Nr. 2981130 Phoenix Contact MINI-PS-100-240AC/5DC/3 ID.Nr. 2938714 - used - Phoenix Contact PSR-SPP-24UC/URM/5X1/2X2 ID.Nr. 2963970 Phoenix Contact IL PB BK DP/V1 Id.-No. 2718688 Phoenix Contact Quint-PS-100-240AC / 24DC / 10 Id.-No. 2938604 -used- Phoenix Contact MCR-VAC-UI-O-DC Art.-Nr. 2811103 Spannungswandler -unused- Phoenix Contact Quint-PS-100-240AC / 24DC / 5 Phoenix Contact FL Switch SFN 8TX 2891929 Phoenix Contact Interbus ST IB STME 24 BDI 8/4 # 2751674 + # 2750808 -OVP- Phoenix Contact MCR-S10-50-UI-DCI-NC Ord.No. 2814728 - sealed- Phoenix Contact EMG 15-B3 - Industrieverpackung mit 10 Stck. 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