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文章通過對 DCS系統(tǒng)在火電廠運(yùn)行中常見的故障及發(fā)生故障原因的分析，有針對性地提出了故障出現(xiàn)時的處理措施，可為火電廠在DCS系統(tǒng)的運(yùn)行和操作人員在實(shí)際工作中應(yīng)用提供借鑒。
　　作為火電廠安全經(jīng)濟(jì)運(yùn)行主導(dǎo)因素的熱控自動化設(shè)備DCS系統(tǒng)，近年來得到了普遍應(yīng)用，為火電廠機(jī)組安全、穩(wěn)定的運(yùn)行起到了積極的作用。但是，DCS系統(tǒng)的安全性和可靠性還有待提高，在運(yùn)行過程中經(jīng)常會出現(xiàn)這樣或那樣的故障，這些故障的出現(xiàn)，導(dǎo)致了發(fā)電機(jī)組的非計(jì)劃停運(yùn)，給發(fā)電企業(yè)造成不應(yīng)有的損失。
　　1、DCS系統(tǒng)常見的故障
　　隨著工業(yè)生產(chǎn)自動化的不斷興起、過程控制要求的日益復(fù)雜，一種綜合控制系統(tǒng)――DCS系統(tǒng)應(yīng)用而生了。由于目前各火電廠對DCS系統(tǒng)的應(yīng)用水平的限制，系統(tǒng)在運(yùn)行過程中難免會出現(xiàn)故障。常見的DCS系統(tǒng)故障有：電源系統(tǒng)故障、硬件(模件)故障、系統(tǒng)軟件故障和通信網(wǎng)絡(luò)系統(tǒng)故障。
　　1.1電源系統(tǒng)故障
　　電源故障是DCS系統(tǒng)的致命故障，一旦電源出現(xiàn)故障，不僅整個系統(tǒng)會停止運(yùn)行，而且還會導(dǎo)致機(jī)組的跳閘，造成非計(jì)劃停運(yùn)。
　　1.1.1電源系統(tǒng)出現(xiàn)故障的主要原因
　　電源方面的問題比較多，一是備用電源不能自投，雖采用UPS和APS雙路互為備用的供電方式，但在轉(zhuǎn)換時也會出現(xiàn)瞬間失電，導(dǎo)致機(jī)組跳閘;二是保險配置不合理及DPU電源內(nèi)部故障等造成電源中斷，導(dǎo)致系統(tǒng)運(yùn)行的停止;三是穩(wěn)壓電源波動引起保護(hù)誤動及接插頭接觸不良導(dǎo)致穩(wěn)壓電源無輸出;四是有的系統(tǒng)整個機(jī)柜通過一路保險供所有輸入信號或一路電源外接負(fù)載很大，導(dǎo)致模件的損壞;五是系統(tǒng)電源未采用UPS供電，冗余備用就更無從談起。
　　1.1.2電源系統(tǒng)故障應(yīng)采取的防范措施
　　要保證DCS系統(tǒng)的安全、穩(wěn)定，首先要具備合理的電源布置，其次要選用高質(zhì)量的電源模塊，并要保證較高的冗余率。再次是注意觀察電源的輸出電壓，防止出現(xiàn)波動。第四是對電源實(shí)行壽命管理，該更換的時候必須更換，絕對不允許等到電源出現(xiàn)了故障的時候才更換。
　　1.2硬件(模件)故障
　　DCS系統(tǒng)的硬件(模件)卡件可分為處理器模件、I/O模件及通訊模件三大部分，這三大模件的功能各自不同，常見的故障部位為過程通道和人機(jī)接口。
　　1.2.1硬件(模件)出現(xiàn)故障的主要原因
　?、龠^程通道故障也就是I/O卡件故障。引起I/O卡件發(fā)生故障的第一方面的原因是卡件因長時間工作而出現(xiàn)老化和損壞，這種工作的發(fā)生，一般是隱藏性的，只有參數(shù)出現(xiàn)異常，系統(tǒng)才會報警;第二個方面是連接線松動導(dǎo)致部分I/O模件與主機(jī)的通信中斷，在這種情況下，系統(tǒng)會馬上做出反應(yīng)，出現(xiàn)報警;第三個方面是外界強(qiáng)電信號竄入形成干擾而導(dǎo)致通道故障的發(fā)生。
　?、谥T如球標(biāo)和控制操作出現(xiàn)失靈和實(shí)效以及操作員站出現(xiàn)死機(jī)、鍵盤和打印機(jī)出現(xiàn)工作不正常的現(xiàn)象都屬于人機(jī)接口故障。
　　球標(biāo)操作失靈的原因有裝置因長時間工作發(fā)生老化或者被浮塵或油膩污染，致使觸點(diǎn)不能實(shí)現(xiàn)自行通斷，也或是電纜插頭接觸不良造成與主機(jī)的通信斷路。
　　控制操作實(shí)效的主要原因是因球標(biāo)的操作信號不能改變過程通道的狀態(tài)，有三種可能：其一可能是過程通道硬件發(fā)生故障;其二可能是操作員站所用軟件的缺陷;其三是設(shè)備超負(fù)荷或者過多地打開窗口，導(dǎo)致不響應(yīng)。
　　操作員站死機(jī)的原因基本與控制操作失效的原因相同。
　　鍵盤工作不正常的原因有：鍵盤組態(tài)出現(xiàn)錯誤、接觸不良、連接電纜松動或者在啟動主機(jī)時誤動了鍵盤，造成啟動缺失。
　　打印機(jī)出現(xiàn)工作不正常的原因：或者是配置不合理，或者是因?qū)Υ蛴C(jī)實(shí)施屏蔽而造成的。
　1.2.2硬件(模件)故障應(yīng)采取的防范措施：
　　在DCS系統(tǒng)的運(yùn)行過程中，為了減少硬件(模件)故障的發(fā)生，需要注意以下幾點(diǎn)：嚴(yán)格按照相關(guān)標(biāo)準(zhǔn)和規(guī)定為硬件提供良好的運(yùn)行環(huán)境;主機(jī)和從機(jī)的DPU不得隨意進(jìn)行人為切換;接地要良好;避免靜電感應(yīng);在工作狀態(tài)下，不應(yīng)隨意打開機(jī)柜，并應(yīng)禁止在其附近使用大功率的無線設(shè)備，諸如禁打手機(jī)和禁止使用對講機(jī);保持工作電壓的穩(wěn)定;對于重要的硬件(模件)要由足夠的冗余配置。
　　1.3軟件故障
　　1.3.1軟件發(fā)生故障的主要原因
　　一般情況下，軟件故障發(fā)生的原因很單純，軟件本身的不完善是故障的主因。
　　1.3.2軟件故障應(yīng)采取的防范措施
　　由于軟件故障的原因單純，那么，防范軟件故障的方法也很簡單，那就是使用正版軟件，但切記要及時升級。
　　1.4通信網(wǎng)絡(luò)系統(tǒng)故障
　　通信網(wǎng)絡(luò)是DCS系統(tǒng)與生產(chǎn)一線連接的紐帶，其故障一般發(fā)生在節(jié)點(diǎn)總線和就地總線，也可能是因?yàn)榈貥?biāo)錯誤所造成。
　　1.4.1通信網(wǎng)絡(luò)系統(tǒng)發(fā)生故障的主要原因
　?、俟?jié)點(diǎn)總線故障。當(dāng)總線的干線任一處中斷時，都會導(dǎo)致該總線上所有站及其子設(shè)備通信故障。
　?、诰偷乜偩€故障。由于其連接的設(shè)備是與生產(chǎn)過程直接發(fā)生聯(lián)系的一次元件或控制設(shè)備，所以工作環(huán)境惡劣，故障率高，容易受到檢修人員的誤動而影響生產(chǎn)過程。另外，總線本身也會因種種原因造成通信故障。
　?、鄣刂窐?biāo)識的錯誤。不論是就地組件還是總線接口，一旦其地址標(biāo)識錯誤，必然造成通信網(wǎng)絡(luò)的紊亂。
　　1.4.2通信網(wǎng)絡(luò)系統(tǒng)故障應(yīng)采取的防范措施
　　要防止通信網(wǎng)絡(luò)類故障的出現(xiàn)，必須做到以下幾點(diǎn)：
　?、贋楸苊夤?jié)點(diǎn)總線故障的發(fā)生，最有效的方法是采用雙路冗余配置的方式，避免因一路總線發(fā)生故障而影響全局。
　?、诜谰偷乜偩€故障的有效方法是，要將就地總線與就地設(shè)備的聯(lián)接點(diǎn)進(jìn)行妥善處理，拆裝設(shè)備時，不得影響總線的正常運(yùn)行，總線分支應(yīng)安裝在不易碰觸的地方。同時，就地總線最好是采用雙路冗余配置，以提高通信的可靠性。
　?、蹫楸苊獾刂窐?biāo)識的錯誤的發(fā)生，主要是要防止人為的誤動、誤改。
　　2、結(jié)語
　　DCS系統(tǒng)可以有效滿足電廠各系統(tǒng)控制的需要，通過對實(shí)際應(yīng)用中不斷暴露出的一些主要故障的分析，及時加以總結(jié)，便于今后相關(guān)儀控維護(hù)人員及時發(fā)現(xiàn)問題并作出準(zhǔn)確的判斷，采取正確的對策。
 

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IC646CSPC050 Proficy Cause+ for Inbligent HMI/SCADA Client Enabler - 50X CALs

IC647IFPLRNUNLMTK iFIX Plus SCADA Unlimited Runtime (M1 Kit Part)

IC660MLA100 Label for IC660BBA100 (Qty 100)

IC697ALG440 Analog Input Expander, Current, 16 Channels

IC758WMM005 iGlobalCare Complete 1-5 Users (same site): DataViews for Windows

FlexLogix System 1794-PS3 120/230VAC TO 24VDC @3A

GuardPLC Systems 1755-IF8 GUARDPLC 2000 - ANALOG INPUT MODULE

Process Control 1757-UPGSIFV UPGRADE ASEA CONTROLLER QUICKBUILDER INTERFACE

Operator Interface 2711P-T12C4D2 PV PLUS 1250, TOUCH, RIO/DH, DC PS, EXT MEM

Support 9220-TAR SUPT REINSTATEMENT CONTRACT FOR 9220TA

Support 2755-ASNFRS SUPT RENEWAL CONTRACT FOR 2755ASNF

Support F1785-LTSERB FIRMWARE UPGRADE FOR 1785-LT PLC5 PROCESSOR MODULE

RSI Software Products 9301-2SE2350JPU2 RSVIEW32 WORKS 300-5K UPGRADE IN-SUPT (JP)

RSI Software Products 9701-VWSTFRU1 RSVIEW STUDIO FOR ME - ENT SERIES UPGRADE (FRENCH)

RSI Software Products 9399-WAB32UGPT RSLINX USERS GUIDE (PORTUGUESE)

Motion Control 8720MC -D180-AA- 180 AMP D CHASSIS DRIVE, ENCLOSURE, LESS OPTIONS

BC646MRB150 Logic PC Runtime 150 I/O

IC300OSW001 Cscape PDA Software with Handspring Visor/Visor Deluxe/Prism Cable

IC754ACC12GAS Gasket for 12 QuickPanel View & Control"

MTR-3T45-H-R-B-M-0 MTR series metric servo motor with resolver and brake

20AC8P7A3AYNAEC0 PowerFlex 70 AC Drive 8.7 A at 4 kW 20A

20DC022A0EYNANANE PowerFlex 700S AC Drive 20D

20G1ALF460AN2NNNNN PowerFlex 755 AC Packaged Drive

25B-D2P3N114 PowerFlex 525 0.75kW (1Hp) AC Drive

2715-T10CD PanelView 5500 10.4 in. Graphic Terminal

FR-A740-5.5K 9.1 KVA 12A 5.5KW

CTT120/480-0 120A 耐壓480V

cDAQ-9179

EPIA-PX10000G

PCL-849

EPE-1815VNA-H61

SKYNET ADT-925C

PCA-6002VE

Q965 18204010

1492-SPM1D500 MCB Supplementary Protector 50 A

變頻器選件 6SE6 400-0BE00-0AA0 BOP2 操作面板 430

20AC2P1C0AYNANC0 PowerFlex 70 AC Drive 20A

GC646MPM001 Proficy GlobalCare Complete for Logic Developer - PLC Nano/Micro

HE693OIU177 Compact VF OIU powered by 24VDC with Numeric Keypad

IC609SJR121RR Series One Junior 24Vdc Src In/Rly Out, 115Vac Power

IC647HSTSC150KM Server to Server Collector for Historian - Standard Server 150000 Points (M4 Key)

IC660BBA026 Block 24/48Vdc Analog Current Source 6 Inputs

IC694MDL741 Output module 12/24 VDC 0.5 amps 16 points, negative logic.

IC756WDJ009E-22 DV Development Sys VB and Java, English, Version 2.2

MicroLogix 1500/1769 System 1769-ECL LEFT END CAP/TERMINATOR

PLC-5/1771 System 1771-CD 1771I/O CHASSIS CABLE FOR 177-P2 POWER SUPPLY

Distributed I/O 1797-OE8H EX HART ANALOG OUTPUT MODULE, 13 BIT, 8PT., S.E.

Operator Interface 2711P-B6C1A PV PLUS 600 COLOR, KEY/TOUCH, SRIO, AC PS

Support 9323-PA1FS SUPT RENEWAL CONTRACT FOR 9323PA1F

Support 9358-HSTS2400R SUPT REINSTATEMENT CONTRACT FOR 9358HSTS2400

Support F1772-LWSERC FIRMWARE UPGRADE FOR 1772-LW PLC2 PROCESSOR MODULE

RSI Software Products 9324-RLD3U7DEE RSLOGIX 5000 STD. TO PRO UPGRADE, GERMAN

RSI Software Products 9305-ADSGWENE RSVIEW32 ACTIVE DISPLAY SERVER WITH RSLINX GATEWAY

RSI Software Products 9358-PLTMCLTENE RSBIZ PLNTMET RED ONLY CL

Motion Control 2092-DA1 DRIVE, 1.4A/3.4A, ULTRA1500 DIGITAL SERVO DRIVE

A06B-0128-B675#7076 A6/3000 Servo Motor, IP67 Sealing, Holding Brake, 64K Serial Encoder

IC200UAR028 28 point PLC,(16) 120VAC In, (12) Relay Out (2 at 10 amp and 10 at 2 amp) 120V/240AC Power Supply. Battery (IC200ACC403) is required for data retention. Battery not included.

IC752BTS450 Display Station 1085 - 10.4" active matrix VGA (640x480) resistive touch screen with integrated keypad, Pentium 133, 32MB, 2 Gig hard drive, expansion slots, Ethernet, with CIMPLICITY HMI and Win NT

MTR-1362-E-A-E-SRR Stepping Motor Nema34 Encoder Splashproof

ZA06B-0113-B075#7008 B0.5/3000 servo motor with 32k serial encoder

20BD3P4A0AYNANC0 PowerFlex 700 AC Drive 3.4 A at 2 Hp 20B

20G11TC770JN0NNNNN PowerFlex 755 AC Packaged Drive

25-PM1-B011 PowerFlex 520 2.2kW (3Hp) Power Module

990XTS00300 Quantum B200 轉(zhuǎn)換接頭

FRN 2. 2E1S-4C 4. 1KVA 5.5A 2.2KW 3相AC380V/50Hz/60Hz

61F-G2 自動供水和排水控制，水位異常高報警 電源:110/220VAC

ATV-31HU30M3XA 3

USB-232/4

PCI-7432

ARCNET PCI20-CXB

INTEK PLUS V3.3

PCI-9111

DAQ-PCI64C

1492-RIFM20F-2 Connection Products

總線插頭 6GK1500-0FC00 RS485 總線插頭， 12MBd180? ，連接 OP 及 OLM

2099-BM10-S Kinetix 7000 Servo Drive

GA647IFESGCLNTCRN GCA iFIX Optn: ESig & ERec iClient Run

GP-2102NT/FOWSB GagePort Digital NT 2-port b (Fowler OEM) - Sales BOM.

IC5007TAX0030 PanelPC 17 inch Standard Unit Deluxe with Windows XP

IC647HSTAE75KM Alarm and Events Option for Historian - Standard Server 75000 Points (M4 Key)

IC647SSM005 Scheduler Shop Floor Server 5 users

IC693MDL742 12/24 Vdc Output, 1 Amp, Positive Logic (16 Points), Fused

IC756LDV000E-925 "DataViews Development on Inb Linux/Red Hat Op Sys, English v9.25"

Pico Controllers 1760-IA12XOW6I 18 I/O EXPANSION MODULE, AC

PLC-5/1771 System 1771-OAN OUTPUT MODULE, 120V AC, 32 OUTPUTS

Distributed I/O 1791P-16B0 PROFIBUS 24VDC CBLOCK I/O, 16 IN SINKING, BASE

Communications 2760-RB FLEXIBLE INTERFACE MODULE, 2-SLOT, 1771 I/O RACK

Operator Interface 2706-PDH485P DH-485 COMMUNICATION MODULE FOR 2706-P22R

Support 9701-VWSB000AR SUPT REINSTATEMENT CONTRACT FOR 9701VWSB000AENE

Support 9515-RSNHS250S SUPT RENEWAL CONTRACT FOR 9515RSNHS250ENE

EtherNet/IP Products 2711P-K7C4B2 PV PLUS 700, KEYPAD, ENET, AC PS, EXT MEM

RSI Software Products 9301-2SE340ITU2R RSVIEW32 RUNTIME 300-32K UPGRADE OUT-SUPT (IT)

RSI Software Products 9356-PRO2300U6R UPGRADE: OUT-SUPT: RSSQL PROF.300 TO 1500 TAG

Motion Control 1326AB-B740C-S2L MOTOR,SERVO,460V,53.0NM,2200RPM,SINGL,IP67

4162-L-6 4162 CONTINUOUS LENS KIT. FOR (6) 4162s

HMI-KPN-302 QUICKPANEL KEYPAD FOR 10.5"

IC693CPU360RR CPU 360 Module (240K Bytes configurable user memory, 4K I/O, 8 racks), no built-in Serial Ports

SPS-24W-2 24 VDC PS, 1.0A, 85-265 VAC INPUT

TRM-JAUX-10 S2K auxiliary I/O screw terminal breakout board with 10 foot cable

20BD014A0AYNAND0 PowerFlex 700 AC Drive 14 A at 10 Hp 20B

20G11BD1K2AN0NNNNN PowerFlex 755 AC Packaged Drive

22C-B012N103 PowerFlex 400- 2.2 kW (3 HP) AC Drive

140XBP00400C Quantum 背板, 4槽, CC