ABB SD802F 3BDH000012R1

ABB SD802F 3BDH000012R1

 

首先得在配电箱周围用φ50镀锌钢管或50×50×5镀锌角铁，往地底下打1.5～2米深，上面用电焊一根φ8～12钢筋头，头上再焊φ10镀锌螺母，用6mm2以上的接地专用多股软线引致配电箱接地线和外壳上。重复接地的作用大，即→当低压供电系统采用保护接零时，除供电变压器的中性点必须进行系统接地外，还必须在零线(应为PEN线)上的一处或多上通过接地体再次与大地做良好的连接，这种接地就叫作重复接地，原理如下图1-1所示。

 

重复接地既可以从零线上直接接地，也可(从接零设备外壳上接地。看起来是两根线，实际上最后都是在一起。重复接地的主要作用如下；
(1) 降低漏电设备外壳的对地电压。在没有重复接地的保护接零系统中，当电气设备外壳单相碰壳时，在从短路到保护装置动作切断电源的这段时间里，设备外壳是带电的，如果保护装置因某种原因未动作不能切断电源，则设备外壳将长期带电，对地电压近似等于相电压。有了重复接地后，就可以降低漏电设备外壳的对地电压，而且重复接地点越多，对降低零线对地电压越有效，对人体也越安全。
(2)减轻零线断线时的触电危险和避免烧毁单相电气设备。在没有重复接地时，如果零线断线，且断线点后面的电气设备单相碰壳，那么断线点后零线及所有接零设备的外壳都存在接近相电压的对地电压，这样可能会烧毁用电设备。而且此时接地电流较小，不足以使保护装置动作而切断电源，很容易危及人身安全，如下图1-2所示。

在有重复接地的保护接零系统中，当发生零线断线时，实际上此时由保护接零转变为保护接地，断线点后的零线及所有接零设备外壳对地电压要低得多，虽然还有危险，但是危险程度已大大降低，如上图1-3所示。
(3)缩短保护装置的动作时间。在相四线制供电系统中， 保护接零与重复接地配合使用，一旦发生短路故障，重复接地电阻与工作接地电阻便形成并联电路，线路阻值减小，加大了短路电流，使保护装置更快地动作，缩短故障时间。重复接地越多，总的接地电阻越小，短路电流就越大，保护装置的动作时间就越快。
(4)减轻或消除三相负荷严重不平衡现象时，零线上可能出现的对地电压。当零线断线时，电源的中性点将位移，会导致三相电压不平衡，从而导致三相电流的不平衡，使得零线电位升高，即呈现出危险的对地电压。如果有了重复接地，将给三相不平衡电流提供一条通路。因此，可以减轻或消除零线断线时，在零线上可能出现的危险电压。
(5) 改善架空线路的防雷性能。如在架空线路进户线的人口附近或分支线的终端处的零线上实行重复接地，对雷电流有分流作用。由上可以看出，在中性点直接接地的供电系统中，应特别注意零线敷设的质量,加强对零线的巡视检查，防止零线断线故障。基于上述理由，在三相四线制系统中，零线上不允许装设开关和熔断器。

P0900VN FBM29 Validated Contact Input/Vdc Output

P0900WA Industrial Pwr Mod 3A, ac Backup Pwr

P0900WF Industrial Pwr Mod 3D, dc Backup Pwr

P0900WL FBM30 Validated Contact Input/Vdc Output Expander

P0900WS I/A Series Small System 2

P0900WT FBM10/15 Term Cable, Wire

P0900WU FBM11/16 Term Cable, Wire

P0900WV FBM10/15 Term Cable, Direct

P0900WW FBM11/16 Term Cable, Direct

P0900ZA FBM10/15 Term Cable, Plug

P0900ZB FBM11/16 Term Cable, Plug

P0900ZR 15 Foot Parallel Printer Cable

P0900ZS Microsoft Serial Mouse For PW's

P0900ZU Nodebus Interface Cable (10 Ft)

P0900ZV Nodebus Interface Cable (50 Ft)

P0900ZW Nodebus Interface Cable (150 Ft)

P0901AA Panel Display Station - 100 Vac

P0901AB Panel Display Station - 120 Vac

P0901AC Panel Display Station - 220 Vac

P0901AD Panel Display Station - 240 Vac

P0901AK Auto/Manual Station

P0901AX A/M Station Cable w/Plug Termination (50 Ft)

P0901AY A/M Station Cable w/Plug Termination (100 Ft)

P0901BJ A/M Station Cable w/Plug Termination (150 Ft)

P0901BU A/M Station Cable w/Plug Termination (200 Ft)

P0901BX A/M Station Cable w/Plug Termination (500 Ft)

P0901BY A/M Station Cable w/Plug Termination (1000 Ft)

P0901ED Dot-Matrix Printer 80, B/W - 120 Vac

P0901EE Dot-Matrix Printer 80, B/W - 220 Vac

P0901EF Dot-Matrix Printer 80, B/W - 240 Vac

P0901EG Okidata 80-Column Printer For PW's (120 Vac)

P0901EH Okidata 80-Column Printer For PW's (220 Vac)

P0901EJ Okidata 80-Column Printer For PW's (240 Vac)

P0901EK Color Ink-Jet Printer - 100 Vac

P0901EL Color Ink-Jet Printer - 120 Vac

P0901EM Color Ink-Jet Printer - 220 Vac

P0901EN Dot-Matrix Printer 132, Color - 120 Vac

P0901EP Dot-Matrix Printer 132, Color - 220/240 Vac

P0901ET Dot-Matrix Printer 80, Color - 120 Vac

P0901EU Dot-Matrix Printer 80, Color - 220/240 Vac

P0901EX Color Ink-Jet Printer - 100 Vac

P0901EY Color Ink-Jet Printer - 240 Vac

P0901EZ Color Ink-Jet Printer - 240 Vac

P0901FA Panel Display w/Auto Manual Station - 100 Vac

P0901FB Panel Display w/Auto Manual Station - 120 Vac

P0901FC Panel Display w/Auto Manual Station - 220 Vac

P0901FD Panel Display w/Auto Manual Station - 240 Vac

P0901FJ A/M Station Cable w/Wire Termination (50 Ft)

P0901FK A/M Station Cable w/Wire Termination (100 Ft)

P0901FL A/M Station Cable w/Wire Termination (150 Ft)

P0901FM A/M Station Cable w/Wire Termination (200 Ft)

P0901FN A/M Station Cable w/Wire Termination (500 Ft)

P0901FP A/M Station Cable w/Wire Termination (1000 Ft)

P0901GE Black Print Cartridge For Color Ink-Jet Printer

P0901GF Color Print Cartridge For Color Ink-Jet Printer

P0901GG Z-Fold Paper For Color Ink-Jet Printer

P0901GH Transparency Film For Color Ink-Jet Printer

P0901GJ Printer Stand 80

P0901HA Industrial Pwr Mod 9, 24 Vdc (Fan)

P0901PE ABDH Cable (To 1771-KF), 40 Feet

P0901PF Modicon Cable (To J478 Modem)

P0901RR Filler Plate

P0901SD ABDH Cable (To 1770-KF2), 40 Feet

P0901SE Modicon Cable (Direct Connect)

P0901VA External Status Tap Assembly

P0901VJ 80 Mb Hard Disk Drive (w/AP10 SW)

P0901VK 80 Mb Hard Disk Drive (w/AP20 SW)

P0901VL 80 Mb Hard Disk Drive (w/AP10 SW) Pedestal Mtg

P0901VM 80 Mb Hard Disk Drive (w/AP20 SW) Pedestal Mtg

P0901VN 80 Mb Hard Disk Drive (w/AP10 SW) Workstation Mtg

P0901VP 80 Mb Hard Disk Drive (w/AP20 SW) Workstation Mtg

P0901VQ 200 Mb Hard Disk Drive (w/AP10 SW)

P0901VR 200 Mb Hard Disk Drive (w/AP20 SW)

P0901VT Bridge Assembly For IE32

P0901XF Support Channel

P0901XT Fieldbus Termination Assembly

P0901XW Carrierband LAN Coax Termination Assembly

P0901YJ FE 8 Sealed Front Door, Extended

P0901YK FE 8 Sealed Rear Door, Extended

P0901YR WS (No Display Panel, Swivel/Cover, End Cap)

P0901YS 19-Inch CRT Without TS

P0901YT 19-Inch CRT With TS

P0901YV Support Channel

P0902BL Nodebus Extender Terminator Assembly

P0902BP FBM24B/25B Term Cable, Wire, (Contact)

P0902BQ FBM24C/25C Term Cable, Wire, (Contact-Ext Pwr)    

P0902BV FBM24B/25B Term Cable, Direct, (Contact)

P0902BW FBM24C/25C Term Cable, Direct, (Cont-Ext Pwr)    

P0902BX FBM24B/25B Term Cable, Plug, (Contact)

P0902BY FBM24C/25C Term Cable, Plug, (Contact-Ext Pwr)    

P0902CA FBM26B/27B Term Cable, Wire, (Contact)    

P0902CB FBM26C/27C Term Cable, Wire, (Contact-Ext Pwr)    

P0902CC FBM26B/27B Term Cable, Direct, (Contact)    

P0902CD FBM26C/27C Term Cable, Direct, (Cont-Ext Pwr)    

P0902CE FBM26B/27B Term Cable, Plug, (Contact)    

P0902CF FBM26C/27C Term Cable, Plug, (Contact-Ext Pwr)    

P0902DZ Communication Processor 15

P0902EA Door Assembly, Rear, Extended, 220 Vac

P0902EE Door Assembly, Rear, Extended, 120 Vac

P0902ES 2 x 4 Cell Bus Assembly

P0902HK Letterbug Tool

P0902JD MIW Straight Bay Mounting Kit

P0902JM 20 Ft Nodebus "A" Cable

P0902JN 20 Ft Nodebus "B" Cable

P0902KZ 50 Ft Nodebus "A" Cable

P0902LN 50 Ft Nodebus "B" Cable

P0902LW IE/FE Nodebus Cable Kit

P0902LX IE/WS Nodebus Cable Kit

P0902LY WS/WS Nodebus Cable Kit

P0902MF HP Ink-Jet Printer For PW's (120 Vac)

P0902MX HP Ink-Jet Printer For PW's (220 Vac)

P0902MY HP Ink-Jet Printer For PW's (240 Vac)

P0902ND HP Ink-Jet Printer For PW's (100 Vac)

P0902NX Panel Mounted Display Station Interface Cable

P0902NZ Door Assembly, Front, Extended, 120 Vac

P0902PH Door Assembly, Front, Extended, 220 Vac

P0902QR Workstation Processor 25 For The Japanese Market

P0902SF SSI Interface Card (OPTO 22)

P0902SG PW-C Processor Unit (120 Vac)

P0902SH PW or PW-NB Processor Unit (120 Vac)

P0902SJ PW-FB Processor Unit (120 Vac)

P0902SK PW-SSI Processor Unit (120 Vac)

P0902SL PW Or PW-NB Processor Unit (220 Vac)

P0902SM PW-FB Processor Unit (220 Vac)

P0902SN PW-SSI Processor Unit (220 Vac)

P0902SP PW-C Processor Unit (220 Vac)

P0902UB 13-Inch Hardened Workstation Display, 120 Vac

P0902UC 13-Inch Hardened Wkst Display/TS, 120 Vac

P0902UD 19-Inch Hardened Workstation Display, 120 Vac

P0902UE 19-Inch Hardened Workstation Display/TS, 120 Vac

P0902UF 13-Inch Hardened Workstation Display, 220/240 Vac

P0902UG 13-Inch Hardened Wkst Display/TS, 220/240 Vac

P0902UH 19-Inch Hardened Workstation Display, 220/240 Vac

P0902UJ 19-Inch Hardened WS Display/TS, 220/240 Vac

P0902UT FBM39 Intelligent Transmitter Input/0-20 mA Output

P0902VG 80 Mb Disk Drive w/AP20 Kanji SW

P0902VH 80 Mb Disk Drive w/AP20 Kanji SW (Pedestal Mtg)

P0902VJ 80 Mb Disk Drive w/AP20 Kanji SW (Workstation Mtg)

P0902VY Resistor Assembly For Intelligent Field Devices

P0902WD 4-Port Passive Tap

P0902WH 4-Port Terminating Tap

P0902WT Trunk Cable Splice Set

P0902WW 170 Mb Hard Disk (SCSI), For Workstation Mtg

P0902WX 170 Mb Hard Disk (SCSI)

P0902WY 170 Mb Hard Disk (SCSI), Pedestal Mounted

P0902XA FBM41 Contact/dc Input/High Current Dc Output

P0902XB FBM42 Contact/dc In/High Current dc Out Expander

P0902YT FBM41A/42A Term Cable (60 V/2.2A), Wire

P0902YU FBM41C/42C Term Cable (Cont/2.2A), Wire

P0902YV FBM41A/42c Term Cable (60 V/2.2A), Direct

P0902YW FBM41C/42C Term Cable (Cont/2.2A), Direct

P0902YX FBM41A/42A Term Cable (60 V/2.2A), Plug

P0902YY FBM41C/42C Term Cable (Cont/2.2A), Plug

P0902ZH Field Conversion Kit For FE-8 Or IE-16 Side Doors

P0902ZH-L FE-8 Or IE-16 Side Door Kit With Lock

P0902ZJ Field Conversion Kit For IE-32 Side Door

P0902ZJ-L IE-32 Side Door Kit With Lock

P0903AA 1 x 8 Cell Bus Assembly

P0903BX 2 x 8 Cell Bus Assembly

P0903CV Annunciator Keyboard

P0903CW Annunciator/Numeric Keyboard

P0903EM Fiber Optic LAN Converter

P0903HL Cell Support

P0903NF Metal Industrial Enclosure Air Filter

P0903NK Power Cord, ac (EC96)

P0903PG Mtg Kit For UFM SPECTRUM Fieldbus Termination

P0903PH Mtg Kit For FIO SPECTRUM Fieldbus Termination

P0903PJ Mtg Kit For UCM SPECTRUM Fieldbus Termination

P0903PQ Migration Expert Diskette Drive

P0903QE Fiber Optic Fieldbus Modem, Mid Bus

P0903QF Fiber Optic Fieldbus Modem, End Bus

P0903QK Fieldbus Power Distribution Unit

P0903QQ Cable Assembly, Power PDU/Modem

P0903QZ Insert Kit For Annunciator Keyboard

P0903RL Battery Replacement Drive, 24 V, IPM06

P0903SA FBM05 Termination Cable, Wire

P0903SB FBM04A Termination Cable, Wire

P0903SV CB4 Cable Balun Module

P0903TW FBM06A Termination Cable, Wire

P0903UP SPEC 200 Fieldbus Isolator (SSFBI)

P0903UQ SPEC 200 Standard Control Integrator (S2BM04)

P0903UR Metal Vented Enclosure - Single ICH19, 120 Vac

P0903US Metal Vented Enclosure - Single ICH19, 240 Vac

P0903UT Metal Vented Enclosure - Single ICH12, 120 Vac

P0903UU Metal Vented Enclosure - Single ICH12, 240 Vac

P0903UW Metal Vented Enclosure - Field Terminations

P0903UX Metal Vented Enclosure - Field Termination

P0903UZ SPEC 200 Fieldbus Isolator Cable

P0903VS SPECTRUM Migration Integrator For UCM (FBP11)

P0903VT SPECTRUM Migration Integrator For FIO (FBP12)

P0903VV SPECTRUM Migration Integrator For UFM (FBP13)

P0903VW SPECTRUM Migration Integrator For UIO (FBP14)

P0903VY Termination Cable Assembly

P0903WA SPEC 200 Configurable Control Integrator (S2BM17)

P0903WB Metal Vented Enclosure - Dual ICH19, 120 Vac

P0903WC Metal Vented Enclosure - Dual ICH19, 240 Vac

P0903WD Metal Vented Enclosure - Dual ICH12, 120 Vac

P0903WE Metal Vented Enclosure - Dual ICH12, 240 Vac

P0903WF SPEC 200 Fieldbus Isolator Extension Cable

P0903WM Air Deflector For Custom Mounting Of Cluster I/O

P0903XK Mounting Kit For UIO SPECTRUM Fieldbus Termination

P0903XL SPEC 200 MICRO Control Integrator (S2MM17)

P0903XR SPEC 200 MICRO Control Integrator Extend (S2MM09)

P0903XU SPEC 200 MICRO Fieldbus Isolator (MSFBI)

P0903YE 1 x 12 FBM Nest With Alarm

P0903ZE Fieldbus Isolator (EC96)

P0903ZL Industrial Pwr Mod 2, 120-240 Vac, 100 ms (EC96)

P0903ZM Input Power Bus, 240 V

P0903ZN Power Bus, Inter

P0903ZP Power Bus, Inter, Backup

P0903ZQ Industrial Pwr Mod 3A, ac Backup Pwr (EC96)

P0903ZR Input Power Bus, 120 V

P0903ZW AW70 Local FB Cable To 1x8 Or MS, 10 Ft

P0904AH WP20/30 Series GCIO wo/TS w/Tabletop (EC96)

P0904AJ WP20/30 Series GCIO w/TS W/Tabletop (EC96)

P0904AK 50 Series GCIO Interface w/o TS (EC96)

P0904AL 50 Series GCIO Interface w/TS (EC96)

P0904AT Cable Assembly Power PDU/Modem (EC96)

P0904AU Fieldbus Power Distribution Unit (EC96)

P0904BD Power Bus, 24 Vdc

P0904BE PC Fieldbus Interface (EC96)

P0904BF Junction Box2, 100/120 Vac

P0904BH Junction Box2, 220/240 Vac

P0904BP WP20/30 Series GCIO w/TS (MIW Top) (EC96)

P0904BQ WP20/30 Series GCIO w/o TS (MIW Top) (EC96)

P0904BR MIW GCIO w/TS (EC96)

P0904BS MIW GCIO wo/TS (EC96)

P0904BV 19" WS Display w/TS (WP20/30 Tabletop) (EC96)

P0904BW 19" WS Display (WP20/30 Tabletop) (EC96)

P0904FH Input Bus Short

P0904HA Industrial Power Module, 2 LAMBDA

P0904HB Industrial Power Module, 3A LAMBDA

P0904HL 28 Volt Power Supply, LZS 500

P0904HM 28 Volt Power Supply, LZS 1000

P0904HN 28 Volt Power Supply, LZS 1500

P0904HV 500 Watt Power Supply

P0904HW 500 Div2/Zone2 Watt Power Supply

P0904HX 250 Watt Div2/Zone2 Power Supply

P0911AC Communications Processor 15 (Synchronous)

P0911AJ Cable, Modicon GW To 984-380, 984-480, 980-680 PLC

P0911AK Cable, Modicon GW To Modicon 984A, Or 984B PLC

P0911AN Wide Range Power Module 2 (WPM2)

P0911AT Synchronous Serial Cable Adapter

P0911AX PW-C Processor Unit (120 Vac)

P0911AY PW-C Processor Unit (220 Vac)

P0911AZ PW Processor Unit (120 Vac), Without Monitor

P0911BA PW Processor Unit (220 Vac), Without Monitor

P0911BD Dot-Matrix Printer, 136, Color - 120 Vac

P0911BE Dot-Matrix Printer, 136, Color - 220/240 Vac

P0911BF Color Ribbon, Dot Matrix Color Printer 136

P0911BG Black Ribbon, Dot-Matrix Printer 136

P0911BH Printhead, Dot-Matrix Color Printer 136

P0911BJ RS232 Printer Cable (136 Color), 40 Feet

P0911BP Video Extension (WP20,25,&30), 50 Feet

P0911BQ Video Extension (WP20,25,&30), 200 Feet

P0911BR Video Extension (WP20,25,&30), 300 Feet

P0911BS Video Extension (WP20,25,&30), 400 Feet

P0911BT WP GCIO Extension (WP20,25,&30), 50 Feet

P0911BU WP GCIO Extension (WP20,25,&30), 200 Feet

P0911BV WP GCIO Extension (WP20,25,&30), 300 Feet

P0911BW WP GCIO Extension (WP20,25,&30), 400 Feet

P0911BX WP GCIO Extension (WP20, 25, & 30), 50 Ft

P0911BY WP GCIO Extension (WP20, 25, & 30), 200 Ft