鼎晟达自动化 6SE7031-8EF80 - SIEMENS

　2.2.2 来自系统外接线的干扰

　　主要通过电源和信号线引入，通常称为传导干扰。这种干扰在发电现场较严重。因为发电厂是强电场和强电磁场密集地方。

　　2.2.2.1 来自电源的干扰

　　实践证明，因电源引入的干扰造成控制系统故障的情况很多，由于控制系统的供电大都来自电厂的供电网络，其覆盖全厂，电网内部的变化，如开关操作浪涌、大型电力设备起停、交直流传动装置引起的谐波、电网短路暂态冲击等，都通过配电线路传到电源。控制电源通常采用隔离电源，但其机构及制造工艺因素使其隔离性并不理想。实际上，由于分布参数特别是分布电容的存在，绝对隔离是不可能的。

2.2.2.2 来自信号线引入的干扰

　　与控制系统连接的各类信号（信号线和控制指令线）传输线，除了传输有效的各类信息之外，总会有外部干扰信号侵入。此干扰主要有两种途径：一是通过变送器供电电源或共用信号仪表的供电源串入的电网干扰，这往往被忽视；二是信号线受空间电磁辐射感应的干扰，即信号线上的外部感应干扰，这是很严重的。由信号引入干扰会引起 I/O 信号工作异常和测量精度大大降低，严重 时将引起元器件损伤。对于隔离性能差的系统，还将导致信号间互相干扰，引起共地系统总线回流，造成逻辑数据变化、误动和死机。控制系统因信号引入干扰造成 I/O 模件损坏数相当严重，由此引起系统故障的情况也很多。所以检测端信号加隔离非常重要（例：北京平和PH系列隔离器产品），既可以保证信号传输精度，还可以保护系统I/O模件不被损坏。

　　2.2.2.3 来自接地系统混乱时的干扰

　　接地是提高电子设备电磁兼容性（EMC）的有效手段之一。正确的接地，既能抑制电磁干扰的影响，又能抑制设备向外发出干扰；而错误的接地，反而会引入严重的干扰信号，使系统将无法正常工作。

　　控制系统的地线包括系统地、屏蔽地、交流地和保护地等。接地系统混乱对 PLC 系统的干扰主要是各个接地点电位分布不均，不同接地点间存在地电位差，引起地环路电流，影响系统正常工作。

　　例如电缆屏蔽层必须一点接地，如果电缆屏蔽层两端A、B都接地，就存在地电位差，有电流流过屏蔽层，当发生异常状态如雷击时，地线电流将更大。

　　此外，屏蔽层、接地线和大地有可能构成闭合环路，在变化磁场的作用下，屏蔽层内有会出现感应电流，通过屏蔽层与芯线之间的耦合，干扰信号回路。若系统地与其它接地处理混乱，所产生的地环流就可能在地线上产生不等电位分布，影响逻辑电路和模拟电路的正常工作。逻辑电压干扰容限较低，逻辑地电位的分布干扰容易影响逻辑运算和数据存贮，造成数据混乱、程序跑飞或死机。模拟地电位的分布将导致测量精度下降，引起对信号测控的严重失真和误动作。（例北京平和隔离器也可有效解决信号共地问题）

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Schneider Electric, AS-BDA0-216, discrete output module - Neu / New

SCHNEIDER ELECTRIC Temp Ctrl,2 EMR,100/240 VAC,1/16DIN, Mod, REG48PUN2RHU

SCHNEIDER SQUARE D CH362 HEAVY DUTY SAFETY SWITCH TYPE 1 ENCLOSURE GENERAL PURP.

SWITCH PRESSURE 20-300BAR W/ DISPLAY - XMLA300D2S11 (Fnl)

SCHNEIDER MERLIN GERIN 18656 NG125N SWITCH AUTOMATIC 4P 63A CURVED C

CB ACCESSORY MX + OF UL 24 VAC / 24 VDC NWK PN:  27118

CIRCUIT BREAKER, 277VAC, 1A NWK PN:  27109

FILTER WITH FAN 562 M3/H 65W IP54 - NSYCVF560M115PF (Fnl)

Schneider Electric 170aec92000 TSX Momentum I/O Base High Speed Counter

Schneider, LC2D25G7, LC2-D25G-7V,  Electric Reversing Contactor Starter NEW

display Eurotherm Schneider Electric 6100E graphic recorder afficheur testé

NEW SCHNEIDER ELECTRIC LC1F115 CONTACTOR 115AMP 3POLE 600VAC

SCHNEIDER ELECTRIC MODICON 140CPS12400R

1PC New in box Schneider Electric TWDLMDA20DRT Twido 24VDC I/O 12IN 8OUT

SWITCH, PUSHBUTTON, 1NO/1NC, 1.2A, 600V, SCREW NWK PN: XB4BW73731G5

SCHNEIDER ELECTRIC TELEMECANIQUE TSXP 4712 TSX P4712  47 12 PROCESSOR MODULE

EARTH LEAKAGE PROTECTOR 2P 16A 240VAC - A9R10216 (Fnl)

NEUGART PLE 120 I = 4 Schneider Electric gbx120004k

Inverter, Schneider Electric Altivar 71, atv71hu75m3, 7,5kw

Telemecanique Altivar 28 Inverter 7,5kw Schneider Electric

1pc schneider electric modicon premium tsxscy21601 module ** new **

1pc schneider electric modicon premium tsxdsy32t2k module ** new **

1pc schneider electric modicon premium tsxdey32d2k module ** new **

CPU PLC Schneider Electric tm221me16t, Modicon m221

Berger lahr schneider electric ifa61/2 DP 0 ISDS/3dm-b54/o-001rpp41 Motor #gr-253-1

Berger lahr schneider electric ifa62/2 DP 0 ISDS/3 DMBB 54/o-001rpp41 Motor #gr-264-2

Schneider Electric lexium32 lxm32md12n4 Servo Drive 400v 3a 0.9kw

Schneider Electric lexium32 lxm32md12n4 Servo Drive 400v 3a 0.9kw _

CPU PLC Schneider Electric tm221ce24r

Outlet box Schneider Electric Canalis 000570 ksb160se4 3l + N + PE Siemens

Schneider Electric Telemecanique ASI 20mt4i4or

Schneider Electric xvc6b4 Light Tower 60 MM, indctg BNKS 60 MM LED ple MNT 24

Schneider Electric tsx7 Power Supply Power Supply tsxsup702r sup702r

IEC Magnetic Contactors, Schneider Electric, LC2D18U7V

Schneider Electric Canalis ksb160se5 Outlet Box

Schneider Electric Altivar atv32h037n4

Schneider Electric-Barber Colman 2" Vlv Repair Kit 7213/214/215 OEM RYB-721-11

Schneider Electric Control Microsystem SCADApack CPU PLC Controller 5203 5601

1 NEW at MostElectric: XBTN410 MAGELIS SCHNEIDER SQUARE D

SCHNEIDER ELECTRIC Logic Relay,24VAC,With Display, SR3B101B

GV2P06 Thermal-Magnetic motor circuit breakers

Schneider Electric: GV2P07

SCHNEIDER ELECTRIC POWERPACT4 METERING FACILITY FOR COMPACT NSX100 MGP MCCBS

schneider electric SD1003SFK 100Amp twinbreak switch f isolator.

NEW! Apc By Schneider Electric SMX48RMBP2U External Battery Pack 48 V Dc Sealed

Schneider LoadCentre KQ 16 Way Distrbiution Board TP 250A Type B - SE48B250

Schneider Electric Digital energy meter me4zrt Digital 17072 OVP

Schneider Electric Pipe ksa25lp42 Elbow 250 a F. direction Canalis

Schneider Electric lc1f400 Power Switch-Distressed

Schneider Electric MX Eco 4v1,5/me4u15aaa Inverter

Schneider Electric Outlet Box Canalis knb63sm412 63a + Schneider ng125n

Schneider electric lxm-32ad18-n4 ac servo drive lxm32ad18n4

Schneider Electric TSX momentum, 170pnt11020

NEW Schneider Electric XACD 22a0105 Hanging Button Crane Control tax Bottle

Schneider Electric Zelio Logic Module, sr3b261bd

Schneider Electric Contactor lc1d80q7 380-400v 50/60hz Boxed

Tele Mechanics/Schneider Electric lc1f185 NEW, NEW OVP

NRF Compressor Air Conditioning Compressor 32165 SAAB 9 3 (ys3d) (1998 - 2003)

Schneider Electric Altivar 312 atv312hu22n4 2,2kw 400v Top Condition

Schneider Electric tsxdey32d2k 32d input Assembly SPS-SEALED -

Schneider Electric a9r31425 IID differential switch, you Class, istantane

Schneider Electric tsxsay1000 Modicon Premium AS-I Bus-Master-Distressed

Schneider Electric TSX Micro tsxdmz28dtk 054046 16i 24vdc+12q 0,5a - UN/BOXED -

Mcb acti 9 c120h tetra 100a schneider electric a9n18436 merlin gerin 3p+n

Telemecanique/Schneider Electric tbxlep020 + tbxdes1622

Schneider Breaker With Rotary Handle Shunt Trip EZC100B3050 EZAROTDS EZASHT200AC

TIME DELAY AUXILIARY CONTACT BLOCK NWK PN:  LADR0

TIME DELAY RELAY, DPDT, 30S, 250VAC NWK PN:  LADS2

90MM X 90MM RED+YELLOW OPER. 4HOLE MTG NWK PN:  KCF3PZ.

KITDSM20/40 59695 SERIE20/40 FRP 2X4X SEPAM SCHNEIDER ELECTRIC ID11526

TSX DSY08T22 8Q 24VDC SOURCE 2A TR.BLK TSX PREMIUM SCHNEIDER AUTOMATION ID10270

AMERICAN POWER CONVERSION G50NETB2 SCHNEIDER ELECTRIC IT USA AV NETWORK MANAG...

SCHNEIDER ELECTRIC LA9D115603604 **New in Factory Packaging**

SCHNEIDER ELECTRIC Illuminated Push Button,30mm,Yellow, 9001KR9P1YH13, Yellow

SCHNEIDER ELECTRIC Illuminated Push Button,30mm,Green,6VAC, 9001KR9P1GH13, Green

SCHNEIDER ELECTRIC Illuminated Push Button,30mm,1NO/1NC,Red, 9001KR9P1RH13, Red

SCHNEIDER ELECTRI Illuminated Push Button,30mm,Green,6VAC, 9001SKR9P1GH13, Green

SCHNEIDER ELECTRIC Illuminated Push Button,30mm,1NO/1NC,Red, 9001SKR9P1RH13, Red

SCHNEIDER ELECTRIC Illuminated Push Button,30mm,Yellow, 9001SKR9P1YH13, Yellow

CARTRIDGE, M221 CONTROLLER NWK PN: TMC2CONV01

RELAY, TIMER, DPDT, 0.1S-10S, 24V NWK PN: 9050JCK21V14

RELAY, SAFETY, 24VAC/DC, Part # XPSAF5130

NEW Schneider Electric It Usa Netbotz Leak Rope Sensor 20ft Nbes0308

Schneider Electric gv2dp116bd TeSys gv2-dm Starter combined Reversible not...

SCHNEIDER ELECTRIC Logic Relay,24VAC,With Display, SR2B121B

TSX-DSY-32T2K Schneider Electric Output Module 32 Point 24VDC

TSXDSY64T2K Schneider Electric PLC I/O Module

Modicon / Schneider Electric Quantum 140CPU11303 PLC CPU Processor

Schneider Electric Modicon M241 PLC CPU Transistor Output Ethernet - New in Box

Schneider Electric-Barber Colman 120V Sr 2-Pos 105# W/Man Over OEM MA51-7100-000

IEC Magnetic Contactors, Schneider Electric, LC2D32B7

SCHNEIDER ELECTRIC Soft Start,440-480VAC,32A,3 Phase, ATS01N232RT

Schneider Electric 3P Miniature Circuit Breaker 20A 120/240VAC, 60196

SCHNEIDER ELECTRIC Joystick Operator,22mm,4 Dir,Momentary, XD5PA24

SCHNEIDER ELECTRIC Safety Monitoring Relay,24VAC/DC,3NO/1NC, XPSAC5121P

LIMIT SWITCH SPST-NO/NC 10A 600VAC - 9007C54B2 (Fnl)

51314259f0+01+av09440051 Schneider Electric 12m Warranty id30771

Schneider Electric-Barber Colman Unit Vent.Tstat, 16#Da, 25#Ra OEM 2298-063

Schneider Electric-Barber Colman Unit Vent.Stat, 16#Ra, 25#Da OEM 2298-060

SCHNEIDER ELECTRIC Safety Monitoring Relay,120VAC,7.0VA, XPSAC3421P

ENCLOSURE, GRP MPN: NSYPLM54 SCHNEIDER ELECTRIC

NEW SCHNEIDER ELECTRIC LC1-D65004F7 CONTACTOR LC1D65004F7

SCHNEIDER ELECTRIC Logic Relay, Input Voltage 100 - 240VAC, SR2B121FU

CSI - TAC - Schneider Electric PCU 7716

Schneider Electric 3P Miniature Circuit Breaker 6A 120/240VAC, 60174

Schneider Electric 8910DPA63V02 Square D Definite Purpose Contactor

DOUBLE PADLOCK HASP ATTACHMENT NWK PN: SS2PL

TESYS KIT, CONTACTOR & OVER LOAD RELAY NWK PN: LR9D32KITD12G7

CURRENT TRANSFORMER, 60:5, 1-1/8 INCH ID NWK PN: 2NR600

Schneider Electric Outlet Box ksb63sd4 63a 3 Pole

Schneider Electric Porter tuersprechmodul SI 95x95x33mm 1 8759/20 (1875920)

SCHNEIDER ELECTRIC Variable Frequency Drive,1 HP,115V, ATV12H075F1

SCHNEIDER MGP2503NAX 250AMP 3 POLE PANELBOARD MCCB COMPACT NSX250NA MERLIN GERIN

schneider merlin gerin PRA21224 C24 CENTR.PAR.IP40 WHITE PT 48M

AMERICAN POWER CONVERSION AP9630 SCHNEIDER ELECTRIC IT USA UPS NETWORK MANAGE...

Schneider Electric-Barber Colman 1/2" Steam Valve, Suc, 0.4Cv OEM VB-7263-0-4-1

Schneider Electric xvc6b15s Tower Light 60 MM, indctg BNKS 60 MM LED Massier...

SCHNEIDER ELECTRIC XVC6M35SK Tower Light,Red/Orange/Green,Base Mount

Merlin gerin lc2d32m7 Schneider Electric Spa-inversor de motor 32a 220va

INDUSTRIAL CONTROL TRANSFORMER, 100VA NWK PN:  9070T100D1

Schneider RCBO (RCD/MCB) 32AMP 30mA 10Ka PN: 26861 Quantity x 10

Schneider RCBO (RCD/MCB) 10AMP 30mA 10Ka PN: 26858 Quantity x 10

ENCLOSURE IP66 600X600X250MM - NSYS3D6625P (Fnl)

INDUCTIVE PROXIMITY SENSOR, 4MM-8MM, 12VDC-48VDC NWK PN: XS618B1PAL10

SWITCH, PUSHBUTTON, 1NO/1NC, 1.2A, 600V, SCREW NWK PN: XB4BW73731B5

SCHNEIDER ELECTRIC Rotating Mirror,Yellow,24VAC/DC, XVR13B05, Orange

TELEMECANIQUE LA5FG431 TESYS F MAIN CONTACT SET 3P SCHNEIDER ELECTRIC

Schneider Modicon Quantum 140CPU43412A

SCHNEIDER ELECTRIC Illuminated Emergency Stop Push Button, 9001KR9P1R05H13, Red

FILTER WITH FAN 165 M3/H 15.5W IP54 - NSYCVF165M115PF (Fnl)

Schneider Electric 19014 vigilant ng125 Block DIFFERENTIAL, 3p poles, 300 but Earth -

TRANSFORMER, ISOLATION, 1 X 120V, 50VA NWK PN:  9070T50D1

PHOTOELECTRIC SENSOR, 5M, NO/NC NWK PN:  XUK9ARCNL2

schneider telemecanique LRD4369 RELAY' THERMAL 110-140 A

New APC NBPD0150 by Schneider Electric NetBotz Rack Sensor Pod 150

Schneider Electric 809-0921 Control Panel for Freedom SW Inverter/Chargers

SCHNEIDER ELECTRIC, XMLA160D2S11, SWITCH, PRESSURE, 10-160BAR, W

SCHNEIDER LRD4367 TeSys D thermal overload relay class 10A - 95 120A relay TERM

New Schneider Electric Fusarc-CF 757352 BP CF-7.2/160

Schneider Electric M-340 BMXAMI0410

NEW SCHNEIDER ELECTRIC ATV-21HU22M3X SPEED DRIVE CONVERTER ATV21HU22M3X

SCHNEIDER ELECTRIC Joystick Operator,22mm,4 Dir,Momentary, XD4PA24

SCHNEIDER ELECTRIC XVC6M25S Tower Light,60mm,Red/Orange,Support Tube

NIB Schneider Electric ZBRRA - 60 day warranty

Schneider Electric Modicon 170ADO35000

Schneider Electric TSXDMZ 28DR - PLC Module - Very Slightly

APC by Schneider Electric Smart-UPS C 1000VA LCD 120V SMC1000

140DAI74000 PLC Module SCHNEIDER ELECTRIC MODICON **New Seal**140-DAI-740-00

140DDO35300 SCHNEIDER ELECTRIC MODICON **New Seal**140-DDO-353-00

140DDI35300 SCHNEIDER ELECTRIC MODICON **New Seal** 140-DDI-353-00

SCHNEIDER ELECTRIC TSXDEZ08A4 8I 115VAC TBLK *NEW IN BOX*

Schneider Breaker Thermal-Magnetic 160Amp CVS250B3P112A-160A

TELEMECANIQUE ATV312H055M2 SPEED DRIVE 0.55KW 1.4KVA 46W 200-240V 1P SCHNEIDER

SCHNEIDER ATV312HU11M3 VARIABLE SPEED DRIVE 1.1KW 3KVA 71W 200-240V 3P

SCHNEIDER ELECTRIC 140DRA84000 NEW IN BOX

Schneider Electric:  BRS397W361ACA / Berger Lahr : VDRM397/50LWCEO Motor <

CIRCUIT BREAKER, LOAD CENTER, 240VAC, 50A NWK PN: QOM50VH

SCHNEIDER ELECTRIC 140DAI55300 AC IN 115V DISCRETE INPUT MODULE - -FREE SHIP

Schneider Conext,Stacking Kit,120/240Vac

Telemecanique Modicon TSX Micro TSX3710101 Schneider Electric

**NEW** SCHNEIDER ELECTRIC LC1 D80L6 3-POLE 125 AMP 600 VOLT CONTACTOR 208V COIL

Telemecanique Schneider Electric Twido twdari 8ht ANALOG IN

Schneider Electric-Barber Colman Dmpr Act. Pivot Mnt. 8-13# OEM MK-3821

Schneider Electric It Usa Ups Network Management Card 2 Ap9630

NEW SCHNEIDER ELECTRIC IT USA 2qty Vertical Cable Manager AR7580A

Schneider Electric LXM23CU07M3X Servo Drive

Nrf Compressor, Air Conditioning 32168

RELAY, ZELIO 2, 24VDC, 20 I/O(R), SR2E201BD 8717141

Schneider Electric xcsle 2525542 switch Contd. Plastic electroimán 2 NC 2 na