描述
若不止一台变压器时,运行方式往往只允许1-2台接地运行,设计采用中性点零序电流继电器与经相邻变压器中性点零序电流继电器控制的零序电压继电器配合使用的变压器保护方案,保护回路设计先跳中性点不接地变压器,然后中性点跳直接接地的变压器,以防止不接地系统故障点的间歇性弧光过电压危及电气设备的安全。为避免全厂所有变压器全部被切的严重后果,保护时间应逐级配合,先断开母联或分断路器,再经零序电压元件跳开中心点不接地主变,最后经零序电流元件跳开中性点接地主变。
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主营:世界知名品牌的PLC、DCS系统备件模块
①Allen-Bradley(美国AB)系列产品》
②Schneider(施耐德电气)系列产品》
③General electric(通用电气)系列产品》
④Westinghouse(美国西屋)系列产品》
⑤SIEMENS(西门子系列产品)》
⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系统、WDPF系统、MAX1000系统备件。
⑧Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)
顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
⑨Siemens(西门子):Siemens MOORE,Siemens Simatic C1,Siemens数控系统等。
⑩Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模块等。
◆Motorola(摩托罗拉):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
Enlarge
NOVELLUS CABLE,FIBER OPTIC ATM RBT 40-151998-00 BROOKS
TAMAGAWA SERVO DRIVER UF2008A-X-AXIS TA81100N2121E917
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 MB3M10-202738-13
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 VLT25-102219-0110
DISCO EAUA–72360 PC,ALU UNIT 2
SCP VTEMP CONTROLLER,TEMPERATURE 00048850-00 613718
MIT LIGHTING,RED COAXIAL LED-GPOA70-228TR
AMAT PORT,EXHAUST,PMS,WXS 0020-42039
TEL BOARD,LOAD PORT ADD ON TOB1007 CT2980-091450-11
TEL INSULATOR,LOWER(G1)OUT ES3D10-101007-12
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 ES3D10-101004-13
AMAT Half Wafe Plate ASSY 0010-C0240