描述
對(duì)中性點(diǎn)有可能直接接地運(yùn)行,也有可能不接地運(yùn)行的主變,因失去接地中性點(diǎn)引起的電壓升高,應(yīng)裝設(shè)相應(yīng)的保護(hù)裝置。在直接接地時(shí)用零序電流保護(hù)。在中性點(diǎn)不接地時(shí)用零序電壓保護(hù)或裝設(shè)放電間隙保護(hù),放到間隙保護(hù)起到過電壓保護(hù)的作用,當(dāng)放電間隙被擊穿形成零序電流通路時(shí),利用接在放電間隙回路的零序電流保護(hù),切除該變壓器。變壓器采用放電間隙保護(hù),放電間隙裝于變壓器中性點(diǎn)與地線之間、有棒形、球形、角形等多種形式,實(shí)際安裝中可以棒形用得最多,零序電壓保護(hù)動(dòng)作電壓按發(fā)生單相接地故障時(shí)保護(hù)安裝處可能出現(xiàn)最大零序電壓整定。
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主營:世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國西屋)系列產(chǎn)品》
⑤SIEMENS(西門子系列產(chǎn)品)》
⑥銷售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(福克斯波羅):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場(chǎng)輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號(hào)處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯(cuò)控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯(cuò)控制器。
⑨Siemens(西門子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂):Indramat,I/O模塊,PLC控制器,驅(qū)動(dòng)模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
AMAT ADAPTER,H2O INLET ASSY 215-10025-00
AMAT FILTER,DRYER,12 ORIFICE,8.0SCFM 6100-0211-000
EBARA MITSUBISHI POWER SUPPLY C-5120-057-0001 Q64P
DNS DISK,EEW CHUCK 2-F3-F8336
ESEC USA PCB,W/COMP PSD CONNECTION E2 888.0904
USHIO CONTROLLER,ROBOT&SIO 9612073
AMPRO COMPUTERS BRAIN,PCB(979&947)A60702
KLA-TENCOR PCB,I/O MECHANICAL 54-0049 36-0194
NOVELLUS MKS VALVE,THROTTLE 60-125751-00 253B-15415
FUJI AC SERVO MOTOR 0380-0126 GRA 1200 200W 94V
ASTEC POWER SUPPLY,24VDC 250W LPS355
AMAT TOP RING,SILICON,150MM 0200-00435
EURESYS GRABLINK VALUE FRAME GRABBER GP 1191 A1_0
AMAT BAFFLE PURGE QUARTZ SIMPLEX 0200-14030
SANYO DENKI BL SUPER PV SERVO DRIVE PV1A015SM91P50
AMAT ISOLATOR,CERAMIC,BLOK-CUST SPECIFIED,0200-?04118
KOMATSU ELECTRONICS CTE-52WS-A CIRCULATOR(DNS)
DNS PCB,EDGE BEAD EXPOSURE UNIT 2-VC-37635 2-VC-39829
AMAT RING,INSULATOR STEPPED PR 0200-02542
YASKAWA AC SERVO MOTOR SIGMA II 50 WATT SGMAH-A5A1F41
VARIAN ASSY,TOUCH SCREEN(979)R1437301
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NOVELLUS CABLE,FIBER OPTIC ATM RBT 40-151998-00 BROOKS
TAMAGAWA SERVO DRIVER UF2008A-X-AXIS TA81100N2121E91?7
TAMAGAWA SERVO DRIVER UF200SA Y-AXIS TA8110N2121E918
SANYO DENKI BL SUPER P5 SERVO MOTOR P50C08075HXS21
DNS HUMIDITY SENSOR 2-39-66527 RHU-E61101328
VARIAN SHIELD,ALPS+8 0021-04644
YASKAWA SERVOPACK SGDA-01APY126 MOTOR DRIVER-NEW
EDWARDS VACUUM HEAD ASSY,QUADRANTS Y05201002-NEW
NOVELLUS DIFFUSER,BASE GAMMA 2130 15-173604-00
TEL INSULATION,SHOWER 2 MB3M10-202738-1?3
AMAT OPTION,RETICLE,?VERSAPORT ASYST 9700-6 010240-A2150
ALICAT CONTROLLER,PRESSURE SOD W/S PCD-5PSIG-D-SV-?MT
AMAT ASSY,HV ESC,DUAL ZONE,ESC,DPS 0090-00208
EATON WAFER CLAMPER BELLOWS 1910680
VARIAN SMC MEMBRANE,AIR DRYER E30000168
AMAT ASSY RH PIVOT&BEARING 300MM ROBOT WRIST 0010-17407
AMAT ASSY,LH PIVOT&BEARING 300MM RO 0010-17406
AMAT BONNET W/CAP BOLT,350MM NOR GATE VAL 3870-03609
PITTMAN SERVO MOTOR GM14902D347-R4
AMAT PCB,TEOS HEATER CONT.BD 0100-38019
VARIAN BUSHING,HOUSING ASSEMBLY BALL E11087460
GENERIC POWER PCB,GP DAC VERSION 3.0 FA9002
GSI LUMONICS PCB,IMBALLANCE INDICATOR S710205 S71-02
GSI LUMONICS APM,I/O CIO-DAS08-PGA
EBARA REGULATOR,SLURRY FLOW C-2250-019-0001 PMM20-XD48
ADVANTEST PCB,PCLD 4540410
DNS ELECTRONICS LLC PUMP,VACUUM VLT25-102219-01?10
DISCO EAUA–72360 PC,ALU UNIT 2
SCP VTEMP CONTROLLER,TEMPERATURE 00048850-00 613718
MIT LIGHTING,RED COAXIAL LED-GPOA70-228T?R
AMAT PORT,EXHAUST,PM?S,WXS 0020-42039
TEL BOARD,LOAD PORT ADD ON TOB1007 CT2980-091450-1?1
TEL INSULATOR,LOWER(G1)OUT ES3D10-101007-1?2
AMAT UHP Pressure Regulator 3800-A0200
RICHMOND POWER SUPPLY,CONTROLLER A/B AB900-1/115
AMAT FLANGE CONNECTING 0020-96176
TEL INSULATOR,LOWER(G1)IN ES3D10-101004-1?3
AMAT Half Wafe Plate ASSY 0010-C0240