NB0U14R-31

NB0U14R-31

NB0U14R-31

随着DCS在火电厂中的广泛应用，其在机组安全稳定运行中所占据的主导地位愈加突出。由于DCS设备软硬件的可靠性、控制逻辑的完善和合理性、热工人员维护和检修水平等诸多因素的影响，使机组误跳闸事件仍时有发生。因此进行有效的技术管理和正确的检修维护，保持火电机组DCS的稳定、可靠运行也就日渐成为热工人员日常管理、维护的重点。为此笔者结合上述案例分析，从提高控制系统可靠性着手，提出一些防范措施供检修维护中参考：
　　（l）对DCS设备和检修维护实行全过程管理，尽早发现缺陷并及时处理。完善DCS自诊断和故障报警功能，对DCS运行状况的实时监控不仅要监视主控制器的状态，还要监视主控制器网络的状态。
　　（2）制定合理的定期维护制度，详细规定检查维护的内容、方法和周期，并对检查结果进行分析，采取针对性的预防措施。镇海电厂自从试行这项制度以来，有效地控制了DCS故障的发生。
　　（3）制订DCS应急预案和典型故障处理方案，防止因维护不当引起的DCS故障。
　　（4）选用品质较好的备品配件，如主控制器的散热风扇、DP插头等，对于易损部件实行定期更换。
　　（5）对电子室的环境温度进行远程监测，接入DCS显示，实时掌握电子室环境温度的变化。使用中央空调的电子室还应注意湿度的控制，如有必要应增装独立的空调或除湿装置。
　　（6）检修时对模件电路板外观进行检查，能起到很好的预防效果。
　　（7）深入了解DCS软件性能，采取合理的组态方法防止极端工况下的误动；禁止使用“超级用户”等不规范的手段进行软件修改。

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2 COOPER AH5661 SINGLE RECEPTACLE 15A 250V NIB

NEW ALLEN BRADLEY 800E-2DL3 SER. A LIGHT MODULE

TELEMECANIQUE ZB4BA3 PUSH BUTTON NIB

NEW SUPER-TREX QUICK CONNECT 65407 T.P.C. WIRE AND CABLE 4 POLE MALE RECEPTACLE

NIB PDI PJDA-1-4F-4M-C-?HC-1 DIFFERENTIAL SWITCH PJDA14F4MCHC1

NIB HUBBELL HBL2341 PLUG 20AMP 480VAC 2P 3WIRE REPLACES CAT. NO. 2343

NEW CUTLER HAMMER E50SAN SERIES A3 LIMIT SWITCH

NIB HONEYWELL MICRO SWITCH 9PA14 HEAD FOR LIMIT SWITCH SIDE LEVER ROLLER

ALLEN BRADLEY 802B-PFARBSX SER. A LIMIT SWITCH - NEW

BERNSTEIN D-32457 LIMIT SWITCH GC-PNP AHST

LOT OF 2 NEW MICRO SWITCH BAF1-2RQ3-LH LIMIT SWITCH ENCLOSED 20AMP BAF12RQ3LH

LOT OF 2 NEW HUBBELL HBL1447 ELASTOGRIP PLUGS

NEW SQUARE D 9007-HA-1 LEVER ARM 5/8DIAx1/4 WIDE 9007HA1 ADJ LENGTH: 7/8＇＇-4＇＇

NEW CONTACT HOOD EPIC# 10.1330 3/4 NPT TOP

NEW ALLEN BRADLEY 800EM-MM5 SER. A PUSH BUTTON

NEW TELEMECANIQUE ZB4BT4 PUSHBUTTON OPERATOR ONLY RED MUSHROOM PUSH/PULL

MICRO SWITCH BZ-2RN702 LIMIT SWITCH BZ2RN702

SINE P22953-YE 15 RECEPTACLE 21 PIN MALE P22953YE15 NEW

ARROW HART AH5242 DUPLEX RECEPTACLE 2P 3W 15A 125V NIB

NIB GENERAL ELECTRIC CR104PBG91G2 PUSHBUTTON 30MM GREEN EXTENDED HEAD

NIB HUBBELL 2436 FLANGED RECEPTACLE 20A, 3P, 480V, HBL2436

ALLEN BRADLEY 800EP-LE4 RED EXTENDED PUSH BUTTON NEW

CHERRY SWITCH PECA-3000 DIGITAL PUSHWHEEL SWITCH NEW PECA3000

NIB CUTLER HAMMER HT8GBRV7 ILL. RED PUSHBUTTON

NEW SQUARE D 9007CO54B2 LIMIT SWITCH

LOT OF 4 SIEMENS TM-E15S26-A1 TERMINAL MODULES TME15S26A1

MICRO SWITCH LSD3K HEAVY DUTY LIMIT SWITCH 10 AMPS 600 VAC

NEW CARRIER HK-02ZB-038 PRESSURE SWITCH P332-2108

NEW 2001261 CPU INTERFACE CABLE

NUMATICS / NUMATROL LR3-0206 GRAVITY RETURN LIMIT SWITCH LR30206 NEW

TPC WIRE & CABLE SUPER-TREX QUICK-CONNECT 84800 NEW

NIB PASS & SEYMOUR L630-P TURNLOK PLUG 30A, 250V, 2P 3W GRDG. NEMA L6-30P

2 NEW TELEMECANIQUE ZB2BK134 3 POS SELECTOR SWITCH

MICROSWITCH BAF1-2RN18-LH LIMIT SWITCH BAF12RN18LH MICRO

SWITCH 20A 277VAC 1 POLE HUBBELL HBL1221I IVORY NIB

NEW TELEMECANIQUE XCMD2102L5 LIMIT SWITCH

LOT OF 4 NEW HUBBELL RACO 907C 4" EXPOSED WORK COVERS RAISED 1/2＇＇ 5AA33

NIB GEMS 14311 FLOAT SWITCH 50 TO 240 VAC 15 V.A.

SINE A421-1P00 MULTIPIN/EDGE RECEPTACLE A4211P00 NEW

HUBBELL HBL316P4W PLUG 16A 110VAC 2POLE NIB

LOT OF 30 NEW ALLEN BRADLEY 1492-NM36 END BARRIERS 1492NM36 SER. B

LOT OF 6 WEIDMULLER 24126 TERMINAL BLOCK STANDARD 12POS, 24-12AWG MK 2/12 NEW

NEW ALLEN BRADLEY 800EP-U2A6 MULTI FUNCTION OPERATOR

NEW HONEYWELL MICRO SWITCH LSYUB1A3 HEAVY DUTY LIMIT SWITCH 10 AMPS 600 VAC

EGS 1/2 GOLD SEAL-TYPE SR STRAIN RELIEF CONNECTORS

PASS & SEYMOUR L520-C TURNLOK CONNECTOR L520C 20A 125V

NEW LINEMASTER 88SN2 CLASSIC III FOOT SWITCH

ALLEN BRADLEY 800EP-LE5 AMBER EXTENDED PUSH BUTTON NEW

SCHROEDER IND. MS5AC PRESSURE SWITCH A-LF2548AC-50

ALLEN BRADLEY 800T-QA10 SERIES T PUSH BUTTON 800T-QA10T

MICRO SWITCH LSM2H HEAVY DUTY LIMIT SWITCH 600 VAC MAX 10 AMPS

TYCO AMP 2-329445-1 RF/COAXIAL CONNECTOR 23294451

NEW HUBBELL 30A 600VAC PLUG SOCKET RECEPTACLE

LOT OF 5 DIALIGHT 101-8430-09-203 LAMP SOCKET 75W 125V 101843009203 NEW

NEW AMPHENOL A416-4K00-A6 CONNECTOR FEMALE PLUG 16 POSITION SINE ENERGY ELECT

（16） ELAV-260-1616-?302 PINS

NEW SIEMENS 6FX2003-1CG20 CONNECTOR SIEMENS

NIB HUBBELL 7464VBLK PLUG LOCKING 15AMP 125VAC 2WIRE

HONEYWELL YAMATAKE SL1-HFXC2 LIMIT SWITCH SL1HFXC2

GOULD SHAWMUT 69152 ALUM. POWER DISTRIBUTION BLOCK 2POLE 600V

LOT OF 2 ALLEN BRADLEY 1492-FB1M30-L FUSE HOLDER

ALLEN BRADLEY 800EP-G5 GUARDED PUSHBUTTON NEW

OMRON ZV-N22-2S LIMIT SWITCH ZVN222S NEW

SQUARE D CLASS 9007 B8 LEVER ARM 2-1/2" 9007B8 NEW

NIB ALLEN BRADLEY 800T-N51 CAP, CLUSTER COLOR FOR PILOT LIGHT 800TN51 SER. B

LOT OF 2 NEW OMRON Z-15GQ-B BASIC SWITCHES Z15GQB

LUMBERG ASBV-4-4-3-138-?RS120M DISTRIBUTION BLOCK ASBV4

ALLEN BRADLEY 800MR-PT16 PUSHBUTTON 800MRPT16 SER. D 110/120V 50/60HZ

SQUARE D 9007CR53B2 LIMIT SWITCH 9007-CR53B2 SER. A

LOT OF 10 LEVITON 060-13550 LAMP HOLDER 660W 600V 06013550

ALLEN BRADLEY 1494V-DS30 DISCONNECT SWITCH RIGHT AND HAND 30AMP 600VAC SER. A

NIB ARROW HART 6340 LOCKING RECEPTACLE 30A 250V 2P 3W GRD

NEW GROUSE-HINDS 5000110-10 CONNECTOR CABLE

NIB CUTLER-HAMMER E50SAN SERIES A1 LIMIT SWITCH BODY

SCHNEIDER ELECTRIC LU9BN11 CONTROL TERMINAL BLOCK

HUBBELL HBL5362 DUPLEX RECEPTACLE 2 POLE 20A 125V NIB

NIB SCHNEIDER ELECTRIC XAC-A02H7 PENDANT STATION ENCLOSURE XACA02H7

NEW ALLEN BRADLEY 800E-2LX11V CONTACT CARTRIDGE SER. A

ALLEN BRADLEY 871C-P5A18 PROXIMITY SWITCH 871CP5A18

LOT OF 5 NEW HUBBELL SHC1015 CORD CONNECTORS, ALUMINUM HUB SIZE: 1/2＇＇

MATSUSHITA AZ7311 LIMIT SWITCH 10A 250V AC

NIB SQUARE D 9001-UO-2 BLANK PUSHBUTTON BLACK MOMENTARY OPEN TYPE 250V, 9001U02

NIB ALLEN BRADLEY 802A-A28P2-S9 LIMIT SWITCH

LUMBERG RSMF 4/0.5M 4 PIN RECEPTACLE CONNECTOR

TELEMECANIQUE ZB4-BA2 PUSHBUTTON ZB4BA2 NIB

MICRO SWITCH BZ-2RW822-A2-BG PRECISION SWITCH USED BZ2RW822

LOT OF 2 NEW TURCK PKG 3M-6/S90 PICOFAST MOLDED CORDSETS ID NO. U2515-6

2 DANFOSS DMC RB2BA3 GREEN PUSHBUTTON RB2-BA3 NEW

ALLEN BRADLEY 800MR-D6 SER. A PUSH BUTTON 800MRD6

ALLEN BRADLEY 800MR-B9 SER. A PUSH BUTTON 800MRB9

SQUARE D C54A2 LIMIT SWITCH

NEW TELEMECANIQUE L100WS TYPE L LIMIT SWITCH NEMA 600

ERSCE FMV 2R.12.100 LIMIT SWITCH NEW

DAYTON 3103100 SWITCH NEW

SIEMENS 3SE2 120-1D LIMIT SWITCH ROLLER PLUNGER 1NO+1NC,SNAP-AC?T

NIB SQUARE D 9007C54B2P10 SERIES A LIMIT SWITCH

NIB HUBBELL 5461 RECEPTACLE SINGLE 20AMP

OMRON VB-3251 LIMIT SWITCH VB3251 NIB

LOT OF 2 20 PIN STAINLESS STEEL PLUGS SCREW ON 10029139

NEW HONEYWELL MDA3711Q1 LIMIT SWITCH ROLLER DEPRESS HARDWARE

ALLEN BRADLEY 800T-PB16R ILLUMINATED PUSH BUTTON

AMERICAN M26SL REED SWITCH NEW

LOT OF 20 TELEMECANIQUE ZB4BV04 PUSH BUTTON NIB FS

MICRO SWITCH LSD7L HEAVY DUTY LIMIT SWITCH 600 VAC MAX. 10 AMPS 600 VAC

NEW SQUARE D 9007 BA-1 LEVER ARM 9007BA1

NEW SOR 4NN-K2-N4-F2A-R?R PRESSURE SWITCH 4NNK2N4F2ARR

IDEC ALW29911D-A-24V PUSHBUTTON ALW29911DA24V W/ TW-DA1 ORANGE

BAILEY & MACKEY 1351 PRESSURE SWITCH 5A 250V~ 14-200bar

ALLEN BRADLEY 800MR-A2 SER. A PUSH BUTTON 800MRA2

MICRO SWITCH LSE1A HEAVY DUTY LIMIT SWITCH

HUBBELL HBL1221 SWITCH 20A 120-277VAC 1 POLE BROWN NIB

NEW SAIA XCG3-S1-Z1 SNAP ACTION BASIC SWITCH; SERIES:XC; ACTUATOR STYL

CUTLER-HAMMER E49S71AP7 LIMIT SWICTH SER. B1

NIB ASCO PB10A PRESSURE SWITCH KJ11A1 TEMPERATURE SWITCH 100-220 F

NEW SMC ISE2-01-15 PRESSURE SWITCH 12-24 VDC 0-1 MPa ISE20115

NEW LUMBERG RKWT 3 U-618/6F CABLE RKWT3U6186F

MICRO SWITCH 1LS19 LIMIT SWITCH 10A-120 240 OR 480VAC

HUBBELL FT3Y5 5 FOOT FLOORTRAK FLOOR CABLE COVER YELLOW 2.985" X .610" 5D688 NIB

CUTLER-HAMMER 10250T3 CONTACT BLOCK 2N.C. 10250T-3 NIB

NEW EGS WDX150 GANG DEEP BOX FIVE HOLE, 1/2＇＇-X TYPE

NEW MICRO SWITCH LSF6B LIMIT SWITCH

NIB CUTLER-HAMMER E50BS1 LIMIT SWITCH 2 NO-2 NC W/ E50DS1 HEAD

NEW TELEMECANIQUE ZCK-D02 LIMIT SWITCH ZCKD02

ALLEN BRADLEY 800EM-P3 ILLUM. GREEN PILOT LIGHT - NEW

NEW AMPHENOL 10-825813-19P CONNECTOR 1082581319P

HONEYWELL MICRO SWITCH EN60947-5-1 LIMIT SWITCH GLEB24A1B

MICRO SWITCH LSZ7C1A HEAVY DUTY LIMIT SWITCH 10 AMPS 600 VAC

ALLEN BRADLEY 1494V-DS30 DISCONNECT SWITCH RIGHT HAND 30AMP 600VAC SER. A

TELEMECANIQUE ZB4BW11 PUSH BUTTON NIB

NEW GENERAL ELECTRIC 10316H89A LIMIT SWITCH WITH BACKPLATE MOUNT

ALLEN BRADLEY X440P-MSLB22E A GUARD MASTER LIMIT SWITCH X440PMSLB22E SER. A

LOT OF 7 NEW TELEMECANIQUE ZB4BA4 PUSH BUTTON METAL HEAD

SQUARE D CLASS 9001 TYPE KM1 LIGHT MODULE 9001KM1 NEW

SIEMENS 3SX3 228 ACTUATOR W/RADIUS 33MM NEW

DANIEL WOODHEAD 67W07 L2-20 20A FEMALE RECEPTACLE NIB

NEW CSQUARE D 9007 R17 1/4" LEVER ARM CLAMP 9007R17

NIB GE CR104PBG01B2 OILTIGHT HD PUSHBUTTON BLACK

ALLEN BRADLEY 800M-XA SER. B SELECTOR SWITCH - NEW

TELEMECANIQUE ZB2-BV06 LENS FOR PILOT ZB2BV06 NIB

BRYANT 70620NC LOCKING CONNECTOR NEMA L6-20 NEW

BARKSDALE CD1H-A80 PRESSURE SWITCH .5-80PSI .034-5.552 BAR

HONEYWELL YAMATAKE SL1-TFXC2 LIMIT SWITCH SL1-TFXC2-A02

NEW ITT 130P13C6 ADJUSTABLE PRESSURE SWITCH

LOT OF 3 NIB TELEMANIQUE KCF1PZ OPERATOR 60X60

LOT OF 2 IDEC ALFW29911D-R-24?V PUSHBUTTONS W/ TW-DA1 LAMP BASE ALFW29911DR24V

NIB ALLEN BRADLEY 800MB-CA1 OPERATOR FOR PUSHBUTTON

NEW LUMBERG RKWT 3 U-618/20F CABLE RKWT3U61820F

NEW SQUARE D PRESSURE SWITCH DCW-8 SERIES B CLASS 9012

10 APPLETON LB100-M 1" CONDUIT OUTLET BODY LB100M NIB

MICRO SWITCH LSZ7E1A HEAVY DUTY LIMIT SWITCH 10 AMPS 600 VAC

ALLEN BRADLEY 800T-E15 PUSH BUTTON LOCK SWITCH NEW

SOR STATIC O RING CONTROL DEVICES 6N3-K2-S1-F1A PRESSURE SWITCH 6N3K2S1F1A

ALLEN BRADLEY 802T-B LIMIT SWITCH 10AMP 600VAC 802TB

LOT OF 10 NEW CAMBRIDGE COMPONENTS CPTX60 CONNECTORS

YAMATAKE FL7M-10J6D-Z PROXIMITY SWITCH DC 12/24V FLZM10J6DZ NEW

NIB GENERAL ELECTRICS SDOM1A STDA OPERATING MECHANISM

TELEMECANIQUE ZB4BV04 PUSH BUTTON NIB FS

LAPP EPIC H-BE-24 RECEPTACLE 16A/600VAC HBE24 NEW

ALLEN BRADLEY 1494V-DS200 SER.C 600VAC/250VDC 200A 3-POLE DISCONNECT SWITCH

NEW TELEMECANIQUE ZB4BK1353 SERIES. B 2 POS TOGGLE SWITCH

NIB BALLUFF BNS-519-D06-D12?-100-10 LIMIT SWITCH ART. NO. 01020770362

NEW MICRO SWITCH 1LS19 LIMIT SWITCH 10A-120 240 OR 480VAC

JOSLYN CLARK 5A10N PUSHBUTTON OIL TIGHT

TELEMECANIQUE ZB4-BV06 PILOT LIGHT BLUE ZB4-BV06 NIB

NIB SQUARE D 9001 TQ-26 SER. A SELECTOR PUSH BUTTON

NEW ALLEN BRADLEY 802M-CAFY5 LIMIT SWITCH 802MCAFY5

NEW DINNECTORS DN-Q12 SCREWLESS TERMINAL BLOCK （BOX OF 17） DNQ12

PASS & SEYMOUR PS20AC2 DOUBLE POLE SWITCH NIB

NEW BRAD HARRISON 43321 SAFETY PLUG-RED 4P ANGLE RECEPT

LOT OF 4 NEW AMPHENOL 97-3057-1010 CIRCULAR CABLE CLAMPS 91/41

NEW BALLUFF BNS-542-3D-12-7?2-FD-R3 LIMIT SWITCH 240V AC, 6A

NEW CLIPPARD PS-L3M-R MUSHROOM HEAD PUSHBUTTON TWIST RELEASE PSL3MR

CROUSE HINDS X8658-3 FEMALE RECEPTACLE NEW

R.B. DENISON C2-JK05 LIMIT SWITCH C2JK05 LOT 677

NIB HUBBELL HBL9430A FLUSH MOUNT BLACK

KOYO ELECTRONICS SJ5-N PROXIMITY SWITCH 07850S NEW

HONEYWELL YAMATAKE SL1-HFYC2 LIMIT SWITCH SL1HFYC2A02

NIB ALLEN BRADLEY X440P-MSLB22E A GUARD MASTER LIMIT SWITCH X440PMSLB22E SER. A

TELEMECANIQUE ZB4-BW031 PUSH BUTTON ZB4BW031 NIB

NEW SQUARE D 9007 DA-1 LEVER ARM 9007DA1

HUBBELL 5661 SINGLE RECEPTACLE 15A 250V NEMA 6-15R NIB

NEW SINE A411-2P00 RECEPTACLE MULTIPIN/EDGE

ALLEN BRADLEY 800MR-I6HX2BS SWITCH SELECTOR 300VAC

NIB CUTLER HAMMER E51RA LIMIT SWITCH RECEPTACLE SER. A1

NIB ALLEN BRADLEY 800T-B1D1 SER. T PUSHBUTTON 800TB1D1

GROUSE-HINDS X8658-5 ECC CONNECTOR X86585

ALLEN BRADLEY X440P-MSLB22B A GUARD MASTER LIMIT SWITCH X440PMSLB22B SER. A

NIB ALLEN BRADLEY 1492-CE6 TERMINAL BLOCKS 1492CE6 SER. B （BOX OF 10）

HONEYWELL YAMATAKE SL1-TFXC2 LIMIT SWITCH SL1-TFXC2-A02

NEW SMC VM-30CB PUSH BUTTON VM30CB

NEW ZANDER AACHEN KL14 SWITCH 16A 250V T85 VDE 0660

R.B. DENISON C2-JD05 C2JD05 LIMIT SWITCH W/ ROLLER ARM USED