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372SPU78001PSSV,

372SPU78001PSSV

分散控制系统(DCS)已在大型火力发电厂广泛应用，并取得诸多经验;对于中小型的企业自备火电厂或区域热电厂，DCS系统的应用正在逐步推广，但其设计、施工及维护经验 尚有欠缺，需要不断摸索和总结。
　　其DCS系统面临的重要问题之一就是如何有效地抑制干扰，提高控制系统的安全性、稳定性与可靠性，由于技术储 备不够完善和人员运行经验欠缺，中小型火电厂更应重视此 点。电源稳定供应、信号正确分类及电缆合理敷设、接地有效 实施作为抑制干扰、提高系统可靠性的有效方法，值得广泛探讨与研究。
　　通过分析中小型火发厂DCS系统对电源、信号、接地的抗干扰要求，结合工程经验，阐述了这三方面的抗干扰设计方 案，提出了施工及维护中的一些注意事项，供项目设计、施工 以及维护参考，以便实现DCS的有效投入，保证电厂安全稳 定运行。
　　2 DCS系统抗干扰要求
　　为提高电厂DCS系统的测量水平和控制精度，保证控制 系统的安全、稳定、可靠运行，热控专业在设计、施工、维护阶段必须合理考虑DCS系统在电源、信号、接地方面的抗干扰要求。
　　2.1 电源要求
　　电源安全性是任何供电系统必须满足的最基本条件。首先在前期设计中在没选择电源和开关型号时，充分考虑所有设备最大工作电流，并留出足够余量，方便日后增加设备。其次在选择电源线路时，不仅要求根据电流容量选择合适线径，而 且要求有足够机械强度，具有防腐性，并且能够阻燃。
　　电源可靠性和连续性是DCS稳定运行的前提。DCS供电 系统除给DCS供电外，不应再接入其他系统和设备，如果无 法实现独立电源，那么可以通过加装电源隔离装置的方法(常 用UPS不间断电源)来实现。供电电源应有两路电源供电，一路应采用交流不问断电源(UPS)，另一路来自厂用低压工 作段电源。两路电源宜设自动电源切投装置，切投时间应确保 不影响控制系统的运行。任何一路电源失去或故障不应引起控 制系统任何部分的故障、数据丢失或异常动作;任何一路电源 失去都应在控制系统获得报警。
　　2.2信号要求
　　DCS的输入、输出信号线是干扰信号进入DCS的途径之一，一般来说信号越弱受干扰的影响越大。首先应对信号分类 如下：
　　①I类信号：热电阻信号、热电偶信号、毫伏信号、应变信号等低电平信号。
　　②Ⅱ类信号：0～5 V、1～5 V、4～20 mA、0～10 mA模 拟量输入信号;4～20 mA、0～10 mA模拟量输出信号;电平型/触点型开关量输入信号;脉冲量输入信号;24VDC小于50 mA的阻性负载开关量输出信号。
　　③Ⅲ类信号：24V～48VDC感性负载或电流大于50 mA 的阻性负载的开关量输出信号。
　　④Ⅳ类信号：110VAC或220VAC开关量输出信号，此类信号的馈线可视作电源线处理布线的问题。
　　其中，I类信号很容易被干扰，Ⅱ类信号容易被干扰，而Ⅲ和Ⅳ类信号在开关动作瞬间会成为强烈的干扰源，通过空间环境干扰附近的信号线。
　　为了有效减小各个信号之间的干扰，不同类型的信号电缆与DCS相连时，信号电缆的设计和布置应满足以下原则：
　　①对于I类信号电缆，最好采用屏蔽双绞电缆。
　②对于Ⅱ类信号，尽可能采用屏蔽电缆，其中Ⅱ类信号中用于控制、联锁的模入/模出信号、开入信号，必须采用屏蔽 电缆。
　　③对于Ⅳ类信号严禁与I、Ⅱ类信号捆在一起走线，应作为220 V电源线处理，与电源电缆一起走线，有条件时建议采 用屏蔽双绞电缆。
　　④对于Ⅲ类信号，允许与220 V电源线一起走线(即与Ⅳ类信号相同)，也可以与I、Ⅱ类信号一起走线。但在后者情 况下Ⅲ类信号必须采用屏蔽电缆，最好为屏蔽双绞电缆，且与 I、Ⅱ类信号电缆相距15cm以上。
　　⑤屏蔽电缆的屏蔽层必须只有一点接地，并且要接地 良好。
　　⑥绝对禁止大功率的开关量输出信号线、电源线、动力线等电缆与直接进入DCS系统的I、Ⅱ类信号电缆并行捆绑。
　　⑦绝对禁止采用一根多芯电缆中的部份芯线用于传输I类 或Ⅱ类的信号，另外部分芯线用于传输Ⅲ类或Ⅳ类信号。
　　⑧严禁同一信号的几芯线分布在不同的几条电缆中(如三线制的热电阻)。

上亿库存，国内外近千个仓库，公司部分产品型号如下，欢迎联系哦~！

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22-JBAB PowerFlex 4-40-40P Conversion Kit

2707-NC8 MicroView to PC RS232 Comms Cable

140ARI03010C Quantum RTD输入,8通道,类型NI或PT,100,200,500,100

284D-FVD6P0B-25-RR-3-DB-SB-EMI DeviceNet Variable Frequency Drive

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1492-MCAA160 60 A UL489 Miniature Circuit Breaker

1492-SPM1D200 MCB Supplementary Protector 20 A

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电机启动器 3VU13401TF00

150-C60NCD SMC-3 60A Smart Motor Controller

1692-ZG6666 24 V DC Electronic Circuit Protection

1771-IFEK 1771 Input Module

193-EC3EE E3 Plus 18-90 A Overload Relay

198-PL21G IEC Pilot Light Enclosure Accessory

2090-CPWM4DF-14AF02 MP-Series 2 m Length Power Cable

2094-BC01-M01-M Kinetix 6200/6500 Integrated Module

DEMOCD00002 Proficy Historian DEMO CD

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IC200UMB001 VersaMax Micro 20/40/64, User Program Memory Module. Compatible with VersaMaxMicro 20/40/64 only.

IC647AQC100 PA Quality Client 100 Pak

IC647PME005 Proficy Change Management Server Machine Edition Version - 5 Concurrent Users

IC693CMM302CA Conformal Coating Enhanced Genius Communications module.

IC754VBB06CTD 6 INCH BASCI TFT WITH BLANK

MSI-ACQUIDATA I/F-43 Acquidata Testream Interface Ver 4.3

SLC/1746 System 1747-DEMO-7 DEMONSTRATION UNIT FOR MODULAR HARDWARE STYLE

Distributed I/O 1734-IB4 24V DC 4 CHANNEL SINK INPUT MODULE

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284-PWRM22A-M12 ArmorConnect 3PH Pwr Media Shld Mtr Cbl

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1492-RCDA4D40 Residual Current Device 40 A

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变送器 3RS11 42-2GW80

1497-L-BASX-0-N Control Circuit Transformer

1606-XLE480EPC XLE 20 Amp Power Supply

1764-24AWA MicroLogix 1500 24 Point Controller

188-K3D400 Miniature Circuit Breaker 40 A

194L-HE4E-175I 194L Control and Load Switch Actuator

2090-CPBM7DF-08AF01 1 m Length SpeedTec Flexible Cable

2090-XXNPMF-16S02 Kinetix Drives 2m Standard Cable

BC647TRT999 CIMPLICITY HMI Viewer Runtime System with Proficy GlobalCare

GC647PSF100 Global Care for Proficy Process Systems 1000 I/O with iFIX

IC200NDD010 10 point PLC, (6) 12VDC In, (4) 12VDC Out, 12VDC Power Supply

IC646PPA772 PA-70 with 772 CPU - AC

IC647NCA000 CIMPLICITY Change Approval for Unlimited Point Server

IC690ACC901 Mini-Converter Kit with cable (RS-485/RS-232)

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IC800SSI420RP2RR 20A, 480V, Profibus S2K Servo Controller for MTR Series Motors

SLC/1746 System 1747-SN REMOTE I/O SCANNER MODULE

Industrial Computers 6181P-15TP2KHSS VERSAVIEW STAINLESS STEEL DISPLAY COMPUTER 15-INCH

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Support 9301-2SE2100DER SUPT REINSTATEMENT CONTRACT FOR 93012SE2100DE

Support 9393-RSTLX5S SUPT RENEWAL CONTRACT FOR 9393RSLTX500

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IC641SWC316 Logicmaster 90-30 Ethernet TCP/IP for Windows 95/NT in a DOS Box w/ InfoLink and Stn Mgr Cable

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2198-BARCON-100DC200 Kinetix 5700 100mm DC Bus Bar

2711P-K15C4A9 PanelView Plus Terminal

280-PWRM35D-M15 ArmorConnect 3-PH Power Media trnk cable

CPM2A-60CDR-D 60点主机 DC24V 36点入24点继电器输出 自带RS232C口

1492-MS6X12 IEC 6 x 12 mm Marker Card

1495-N74 1-1/2 in. Hub

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1585J-M4UBJM-3 RJ45 Ethernet Media

1756-PA72 ControlLogix AC Power Supply

188-K1C250 Miniature Circuit Breaker 25 A

194E-KA32E-P11-PE 194E Load switch

2090-CFBM7DF-CEAF03 Kinetix 3m Flexible Cable

2090-UXNBMP-18S09 MP-Series 9 m Length Brake Cable

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GC647IFESGCLNTCDV GCC iFIX Optn: ESig & ERec iClient Dev

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IC646MBT001 Machine Edition Traditional Development Suite

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IC660SLD024 Red Safety Label Kit for IC660BBD024 Genius Blocks

IC697CHS750RR Series 90-70, 5 Slot Rack, Rear Mount

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Motion Control

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IC300TRM016 Spring-clamp style I/O plug, 16-terminal

IC800BPK012 12 Amp Beta Series Amplifier Package

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25C-B062N104 PowerFlex 527 15kW (20Hp) AC Drive

280-MTR22-M4 ArmorConnect Motor Cable

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1492-M3X12 IEC 3 x 12 mm Marker Card

1494G-FF3N NEMA 1494G Enclosed Disconnect

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1756-BA2 ControlLogix L6X Ser B ONLY Battery Assy

1794-IM8 Flex 16 Point Digital Input Module

194E-CA20 194E Load switch

2080-MOT-HSC Micro800 250KHz HSC Plug-In

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GC646MRB700 Proficy GlobalCare Complete for Logic PC Runtime 700 I/O

HE693STP101 Discontinued Part. Check with GE IP on migration path.

IC610MDL181RR U.L. Listed Relay Output (5 points)

IC647HSTSS1750KM Historian Standard Server 1,750,000 Points (M4 Key)

IC660BBR100 Block Relay Output Normally Closed 16 Circuits. Module is not UL approved.

IC695ALG112CA RX3i Isolated Analog module, conformal coated, 12 individual isolated channels are configurable for voltage and current. Requires high capacity terminal block IC694TBB032 or IC694TBS032.

IC756WDS000J-22 Dataviews Development Suite (All Windows Languages, Custom Editor Tool kit, Custom Datasource Toolkit, 1 yr SAFE), Japanese, Version 2.2

CompactLogix System 1769-OA8 8 POINT 120/240 VAC OUTPUT MODULE

PLC-5/1771 System 1771-N2 EMPTY SLOT FILLER CARD

Distributed I/O 1799-COV20 CLEAR PLASTIC COVER, 4 STAND-OFFS/SCREWS (20 PT)

Operator Interface 2711P-K6M20D PV PLUS 600 GRAYSCALE, KEYPAD, ETHERNET, DC PS

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RSI Software Products 9701-VWMR030ADEE RSVIEW ME STATION RT 30 DISP-WINDOWS 2000 (GERMAN)

RSI Software Products 9330-GC300U2 UPGRADE: IN-SUPT: RSGUARDIAN CORE 24 TO 4096 NODE

Motion Control 2094-PRS8 POWER RAIL, SLIM, 230V OR 460V, 8 AXIS

A06B-6093-H402 Ext. Regen Resistor, 30 Ohm 100 Watt, Beta or I/O Link Amplifiers

IC200UEX211-24 Qty of 24, 28 point expansion. (16) 24VDC In, (12) Relay Out, 120V/240AC Power Supply (includes IC200CBL501)

IC752COM101 Omron 9 pin cable for DataPanel 30/50

MTR-3N32-G-R-0-N-SRR Servo Motor Nema34 with Seal

ZA06B-0153-B175#7076 A30/3000 servo motor with IP67 sealing and brake and 64k serial encoder

20BD8P0A0NYNANC0 PowerFlex 700 AC Drive 8 A 5 Hp 20B

20G14NC302JN0NNNNN PowerFlex 755 AC Packaged Drive

25-PM2-A2P5 PowerFlex 520 0.4kW (0.5Hp) Power Module

TLXCDLTOFS33 Quantum 10 LICENSES LARGE OPC SERVER

FRN0.75C1S-4C 1. 9KVA 2.5A 0.75KW 3相AC380V/50Hz/60Hz

1492-J4 4 square mm Feed-Through Terminal Block

1492-SPM3D160 MCB Supplementary Protector 16 A

软启动器 3RW40552BB34

SIMATIC HMI 系列面板 6AV2124-1QC02-0AX0 KP1500 精智 15.4 寸

150-SPPB3UR SMC-50 POWER POLE ASSEMBLY 140A

1738-IB8M8 ArmorPoint 8 Point Input Module

1784-PCD1 DeviceNet Comms Cable for 1784-PCD Card

193-KC10 7.2-10.0 A IEC Bimetallic Overload Relay

20-750-PH2-F9 PF755 FR9,IP00,24 VDC WIRE HARNESS

2090-CSBM1DE-10AF15 Kinetix Cable Single DSL 2090-Series

20AB4P2A0AYNANC0 PowerFlex 70 AC Drive 4.2 A at 1 Hp 20A

GA647IFPRDV00075 GCA iFIX Profsnl SCADA 75 I/O Dev

GP647IFESGDV00300 GCP iFIX Optn: ESig & ERec 300 I/O Dev

IC600BF900RR Local I/O Transmitter Module

IC647HSTCCP50M Historian Client Connection Pack 50 Users (M4 Key)

IC647TIDC TID:Texas Instrument Direct

IC693MSC301RR Series 90-30 Demonstration Case

IC756LDV010E-98 DV Draw Development on Intel/Linux RedHat Op Sys, English, Version 9.8

MicroLogix 1000/1761 System 1761-L10BWA 10 I/O MICROLOGIX 1000

PLC-5/1771 System 1771-OWN SELECTABLE CONTACT OUTPUT MODULE 32 POINT

Distributed I/O 1791-N4C2 BLOCK I/O, 120V AC, 6 POINT ANALOG MODULE

Communications 1786-FSB500 200 MICRON BULK CABLE 500 METERS (1640 FT)

Operator Interface 9399-RSVADSGR RSVIEW32 ACTIVE DISPLAY SYS GETTING RESULTS GUIDE

Support 9356-PRO2350R SUPT REINSTATEMENT CONTRACT FOR 9356PRO2350

Support 9324-RL0700NXS SUPT RENEWAL CONTRACT FOR 9324RL0700NXENE

EtherNet/IP Products 9351-AIXRT INTERCHANGE FOR AIX RUNTIME

RSI Software Products 9301-2SE3500FRE RSVIEW32 RUNTIME 100K (FRENCH)

RSI Software Products 9356-PRO2500U2 UPGRADE: IN-SUPT: RSSQL STD.300 TO PROF.70000 TAG

Motion Control N-3412-2-H04AA SERV MTR,1.6NM,6000RPM,2000 LN ENCDR,BRK

44A731202-G03 Upgrade Kit Genius IC660BBA103

IC200ALG328 ANALOG OUTPUT 13 BIT CURRENT 12 Channel

IC693PWR321 Power Supply, 120/240 Vac, 125 Vdc, Standard

Silver Series 9323-PI300D A.I SERIES PLC-5/250 OFFLINE/ONLINE PROGRAMMING

VSPC32-ADMIN VisualSPC Administration Bundle includes Attributes, Analyst, Designer , Wizard, Importer and Reports.

20BD027A0AYNANB0 PowerFlex 700 AC Drive 27 A at 20 Hp 20B

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22C-D208A103 PowerFlex 400- 110 kW (150 HP) AC Drive

520422000 Quantum 远程I/O干电缆终结电阻，75 欧

285-BRCF25-M6 ArmorConnect Brake and Motor Cable

E6B2-CWZ6C 5-24VDC,集电极开路输出30VDC 35mA,3相,1000P/R,2000P/R

1492-SPM2B005 MCB Supplementary Protector 0.5 A

变频器选件 6SE6 400-1PB00-0AA0 Profibus 通讯模块

电机启动器 3VU16400MM00

150-CC25 SMC-3 Accessory

1715-IB16D 1715 16 Point Digital Input Module

1771-IXHR 1771 8 Point Input Module

193-EC4EE E3 Plus 18-90 A Current Relay

198-WT2 ModCenter IEC Wiring Kit

2090-CPWM4DF-16AF09 MP-Series 9m Power Cable

2094-BL75S Kinetix Line Interface Module

DEMOCD00014 Proficy Shop Floor SPC - DEMO CD

GFK-0777 Analog-100 Brushless Servo Amplifier Instruction Manual

IC210DAR010 AC (85 to 264VAC) Power Source, 6 AC in/4out (Relay 8 Amp), Expandable, with LCD/Keypad

IC647ASC010 PA SDK 10 Pak

IC647PPSOF3 Proficy Process Systems Operator Console with iFIX - 3 Pak

IC693CPU313 5-Slot Base With Turbo CPU in base (.6 msec), 1K Registers, (12K Bytes User Program) Battery included

IC754VGI06SKD View Interm 6In STN Keypad DC GEF Ovrlay

MSI-DASHBOARD-10 Dashboard Client 10 Pack

SLC/1746 System 1746-R16 REPLACEMENT COVER & LABEL FOR CTLG # 1747-ASB

Distributed I/O 1734-OX2 24V DC COIL N.O./N.C. DPST RELAY MODULE

Application-specific products 1803-EEM30 EEM,48 PULSES, 24V DC

Operator Interface 2711-ND3 PANELBUILDER32 SOFTWARE

Support 9302-CTKR SUPT REINSTATEMENT CONTRACT FOR 9302CTK

Support 9381-PP250KENS SUPPORT RENEWAL CONTRACT FOR 9381PP250KEN

DeviceNet Products 1791D-0V16PX 24 VDC COMPACTBLOCK I/O EXPANSION, 16 OUT SINK

RSI Software Products 9301-2SE3350FRU2 RSVIEW32 RUNTIME 300-5K UPGRADE IN-SUPT (FR)

RSI Software Products 9380-RSBCNS2 2-DAYS MISCELLANEOUS SERVICES FOR RSBATCH