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PC-A984-130增强型
- 品牌：施耐德
- 规格：全新
- 材质：塑料
- 产地：美国
- 转数：3453
- 功率：4353
- 电压：3453
- 更新时间：2024-12-21
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PC-A984-130增强型
高压软起动
社会发展是有阶段性的。在不同阶段，人们的生产手段、生产工具和生活用品都有很大的不同。上世纪80～90年代，的经济实力尚较薄弱，当时的小水泥和小钢铁发展很快，1000kW～4000kW电机的应用增长很快，与当时的经济基础相适应的液态起动装置出现，它经济实用，解决了电机起动中的一些问题。对当时的经济发展起到了的作用。到世纪之交时期，经济实力已有较大的发展，生产手段和生产工具亦有了较大发展，电机容量也有了很大增长，人们开始不满足液态起动装置的低性能，于是晶闸管串联式（固态）软起动装置的应用开始增加，继而又出现了开关变压器式软起动装置和磁饱和电抗器式（磁控）起动装置，变频装置用于电机软起动的情况也越来越多，当前这四种产品是大型电机起动市场的主品，液态起动装置则应用在小型（5000kW以下）电机上较多。另外，两种老式起动方法（自耦变压器和变压器-电动机组）也常常出现在20000kW以下电机的起动上。
大型电机驱动的设备一般都是企业的核心设备，直接影响企业的生产状况，因此人们应该对其起动给予特别的关注，合理的选择起动装置将给企业带来很大的经济效益。但是电机起动技术毕竟不是一个企业的核心技术，许多企业的电气工作者很少有时间来研究起动方法之间的差别，往往会造成不恰当的选择，有时甚至不得不做出第二次选择，给企业造成不应有的损失。因此，如实地说明起动方法的性能及其差别是非常重要的。为此我们在这方面做抛砖之尝试，如有不完善和不妥之处，望不吝添金加玉。
引起电网电压波动，影响同电网其它设备的运行
交流电动机在全压直接起动时，起动电流会达到额定电流的4~7倍，当电机的容量相对较大时，该起动电流会引起电网电压的急剧下降，影响同电网其它设备的正常运行。
软起动时，起动电流一般为额定电流的2~3倍，电网电压波动率一般在10%以内，对其它设备的影响非常小。
⒉对电网的影响
对电网的影响主要表现在两个方面：
①超大型电机直接起动的大电流对电网的冲击几乎类似于三相短路对电网的冲击，常常会引发功率振荡，使电网失去稳定。
②起动电流中含有大量的高次谐波，会与电网电路参数引起高频谐振，造成继电保护误动作、自动控制失灵等故障。
软起动时起动电流大幅度降低，以上影响可免除。
Factory Hot FDA Portable ECG/EKG machine 12-Leads 3-Channel+Printer, PC Software
Factory FDA Portable ECG/EKG machine 12-Leads 3-Channel+Printer&Paper,,Software
Factory FDA LCD Baby Sound B Fetal Heart Doppler,Gel Included,USA fast shipment
Factory ECG300G Digital 3-Channel 12 Leads Electrocardiograph,USB Software,FDA
Factory Digital Memory Blood Pressure Monitor,Heart Beat pulse Rate software FDA
Factory CE&FDA LCD Pocket Fetal Doppler,Baby Heart Monitor,free Gel,Baby sound B
Factory CE FDA LCD Hand-held Pocket Fetal Doppler,Baby Heart Beat Monitor + Gel
Expedited Shipping, Battery & 3 tube of Gels, On Sale
Electronic ARM Digital Blood Pressure Monitor+4 Cuffs+SPO2 Probe+NIBP+Software
ECG300G FDA Portable ECG/EKG machine 12-Lead 3Channel ECG+Printer&Paper,Software
ECG+SPO2+NIBP+RESP+RESP+Pr,Optional Printer/Etco2/IBP
ECG+NIBP+SPO2+RESP+TEMP+Pr,Optional Printer/CO2,VET USE
ECG,SPO2,PR,NIBP,RESP,TEMP
ECG,SPO2,PR,NIBP,RESP,TEMP
ECG,SPO2,PR,NIBP,RESP,TEMP
ECG EKG CABLE FOR CONTEC ECG80A ECG100G/300G/600G/1200G , SNAP HEAD IN USA
ECG à 6 Pistes CONTEC
ECG à 3 Pistes CONTEC
Earphones, LCD Display, FDA CE Approved. Ships From USA
Doppler Fetal de Bolsillo Baby Sound A
Doppler Básico para Bebe SonoTrax con Sonda de 3MHz, Gratis Tubo con Gel
Digital automatic blood pressure monitor for adult Contec 08A
Digital 3 Channel 12 lead ECG/EKG machine + software Electrocardiograph, Printer
DA12-2(98) Contec DA12-2
CONTEC-USA,Handheld Baby Monitor Fetal Heart Rate Doppler,Baby Sound B LCD+GeL
CONTEC-USA FDA Fingertip Pulse Oximeter,SPO2 Monitor r+Free CASE,Promotion!
CONTEC-USA Color LCD 3 Channel 12 Leads ECG/EKG machine Software+Printer&Paper
contec-08c Digital automatic blood pressure monitor for adult
CONTEC08A VET Digital Blood Pressure Monitor For Veterinary small animal use
contec-08A Digital automatic blood pressure monitor for ADULT FDA Approved
contec-08A Digital automatic blood pressure monitor for adult
Contec, CB-12C, Lot of 9,
CONTEC ZP-A100016V2 PCB
Contec Wall WipR Cleaning System - Swivel T-Handle Model WWH18 !
CONTEC VPDEST0300 PCB Card Holder 12
CONTEC Vet Veterinary ECG ekg Single channel 7 leads ECG 80A-VET
CONTEC Ultrosonic LCD Baby heart Monitor Baby sound B, Free Gel, FDA CE Approved
CONTEC Ultrosonic Fetal Doppler, 3mhz Probe/Gel/LCD Backlight, FDA Sonoline B
Contec TTL Bidirectional DIO 48 Channel Card, # PIO-24/24, (PC) 9635, WARRANTY
Contec Tswc0917,Tuffstuff Critical Task Wipers
Contec Touch Screen Finger Probe Pulse Oximeter PM-60A + Card
CONTEC TELCON Isolating Amplifier MDTC 10 v
CONTEC TAXFRE **NIB**
Contec Square Sterile Polyester Nonwoven Wipe 9" C2-99IR/25 150-Pack NIB
CONTEC SPC-CLR-JMC2 Rack Mount Control Computer FA-UNITF8DR
Contec SP10 Digital Lung Spirometer,PEF, FEFV1, FEF Lung Volume Device
Contec Sonoline B Pocket Fetal Heart Doppler CE FDA Approved LCD Gel + Batteries
CONTEC Sonoline B Fetal Doppler, 3Mhz Probe/Gel/LCD Backlight, CE FDA USA Stock
Contec Sonoline B 2Mhz Fetal heart doppler Backlight LCD gel FDA Approved
Contec SMC-3(PC), No. 7007B ISA PC interface Stepper Motor Controller - MINT
CONTEC SIO-4(98) 9253C PCB
CONTEC Single Channel 12 lead ECG/EKG electrocardiograph, ECG100G, USA Promotion
CONTEC SATWIPES - IPA BLUE - ISOPROPYL ALCOHOL CLEAN ROOM WIPES
CONTEC SATC3VMP **NNB**
CONTEC Sale,FDA CE Finger Pulse Oximeter Fingertip Oxygen Monitor SPO2 PR CMS50C
CONTEC ROM-DISK (98)H PCB
Contec Pulse Oximeter CMS50C Blue
Contec PSD-50(98)K Contector Terminal 60V/1A/2mm max
Contec PSD-50(98)D Contector Terminal 60V/1A/2mm max
Contec PSD-40(98)D Contector Terminal 60V/1A/2mm max
CONTEC PROSAT 9" X 11" ALCOHOL WIPES RESPIRATOR FACE SHIELD CLEANER SANITIZER
Contec PPC-HDD(MS)-B Hard Drive (10769b)
Contec PPC-HDD(MS) 5/2 Hard Drive
CONTEC PPC-CPU686-MS-MU PPCCPU686MSMU
Contec PPC-CPU686(MS)-128 Programmable Controller (10768b)
CONTEC POW-CB30(AF) IEEE802.AF 1113
Contec Pocket Fetal Monitor
CONTEC Pocket fetal doppler,Prenatal Baby Heart Beat Monitor +Gel,Baby Sound A
Contec Pocket Fetal Doppler Sonoline B
CONTEC PO-64L-PCI PO64LPCI
CONTEC PO-48(98) PCB
CONTEC PNHS-99 POLYNIT HEATSEAL 9x9IN (23x23CM) 75 WIPES/BAG
Contec PM-50 Portable Blood Pressure Patient monitor Oximeter Monitor SPO2
CONTEC PIO-32/32TPC PIO3232TPC
CONTEC PIO-32/32L-PCI PIO3232LPCI
CONTEC PIO-32/32L-PC PIO3232LPC
CONTEC PIO-32/32L(PCI) *SEALED*
CONTEC PIO-32/32L PCI ISOLATED DIGITAL I/O CARD * SURPLUS FACTORY PACKAGING*
CONTEC PIO-32/32L 7212B PCI ISOLATED DIGITAL I/O BOARD
CONTEC PIO-32/32F(PCI)H PIO3232FPCIH
CONTEC PIO-32/3(98)E 9801D , input/output of digital signals
CONTEC PIO-24/24T (98) 9527A ISA PC BOARD
CONTEC PIO-16/16T(98)E I/O BOARD
CONTEC PIO-16/16RL(PC) PIO1616RLPC
Contec PIO-16/16L(PC)V Isolated Digital I/O Board for ISA
Contec PIO-16/16B(PC)H Isolated Digital I/O Board for ISA. Brand !
CONTEC PIO-16/16 (98) H 9705A ISA BOARD
CONTEC PI-64L-PCI PI64LPCI
CONTEC PI-64L(PC) 9860 ISOLATED DIGITAL INPUT BOARD
Contec PI-64L PCB Interface Board 9860 Working I-900SRT
CONTEC PI-64(98)E 9802B PCB
CONTEC PI-32L(PC) NO 9553A ISOLATED DIGITAL INPUT BOARD 701503-201-000 DUN0288
Contec PI0-32/32L 9859A Interface PCB Board working
Contec PI0-16/16L (PC)H Serial No. 9765B
Contec PI0-16/16B(PC)H Digital I/O Board OptoIsolation. Brand !
CONTEC PC-RAS(98) PCB
CONTEC PC-LCD (PCI) T CARD 7578C AK35
CONTEC PCI-212 SRAM-256 (9245B) BOARD PIF-0253
CONTEC PCI BUS EXPANSION ADAPTER EAD(LPCI)BE *SEALED*
Contec PC-FDD25BH Floppy Drive
CONTEC PC-80286(98)MH-02 PCB
Contec PC-686BX Industrial Main Board Computer
Contec PC Board AD16-16U(PC) EH #58264
CONTEC P10-64/64LPCIH P106464LPCIH
CONTEC P10-32L (PC) No. 9859A I/O Printed Circuit Board PCB
CONTEC P10-32/32RL NO#7030A I/O BOARD GOOD TAKEOUT
CONTEC P10-32/32L(PCI)H DIGITAL I/O BOARD W/ OPTO-ISOLATION *FACTORY SEAL*
CONTEC OPERATOR INTERFACE FLAT PANEL PANECON IPC-RT/M600 PC TWOu
CONTEC MULTI FUNCTION ANALOG INPUT ISA BOARD AD12-16(PC)EH (S15-3-11B)
Contec Model: PIO-16/16T (PC) H. 16 Channel Opto-Isolated Digital I/O Bd. H
Contec Model: PI-32TB(PC) High-Speed TTL-Level Digital Input Board. ISA H
Contec Model: PI-32T (PC) H, TTL-Level Digital Input Board. H
CONTEC MICROELECTRONICS USA INC PIO-32/32L(PC) Digital I/O Board 64 CH NEG (VIK
Contec Melsec-Q Recognized PPC-HDD(MS)-B Hard Drive
Contec Medical Systems 50DL Finger Pulse Oximeter Pink Pink
CONTEC Manufacturer,TLC5000 12-leads synchro analysis
CONTEC Manufacturer,TLC5000 12-leads synchro analysis
CONTEC Manufacturer,12.1 inch screen,6 parameters
CONTEC Manufacturer,12.1 inch screen,6 parameters
Contec Manufacturer, FDA Cleared, Limited Promotion
CONTEC Manufacturer USA 2-5 days arrival BABY SOUND B
CONTEC Manufacturer USA 2-5 days arrival BABY SOUND A
CONTEC LWHC0002 HOSE COVER JERSEY KNIT 27" X 102" - BAG OF 5
Contec Klean Max Mop Heads, Polyester Microfiber, 4 Qty., 4.3"x15"x0.7" HCKM3003
CONTEC ISA Bus Expansion Box Chassis Case 11 Slot FA-PAC(PC) Type M11RF J24
Contec IRT-16(PC) Interrupt Control Board ! !
CONTEC IRC-6F IRC6F
Contec IPC-PL/M400 IPC Panel PC w/ IPC-PAC(98)-2AF Expansion from Ebara CMP
CONTEC IPC-DT/M30-PC-T IPCDTM30PCT
CONTEC IPC-BX720-A00 Box Computer w/ Matrix Morphis Y7142-03 & Software
CONTEC I/O EXPANSION UNIT FA-PAC PCH-5 =
CONTEC HI-RES ANALOG INPUT BOARD AD16-16(PC)E 7027B AD1616PCE
CONTEC HIGH SPEED MULTI FUNCTION ANALOG INPUT BOARD AD12-16U(PCI)E (S15-3-21C)
CONTEC GP-IB[PCI] 7126A BOARD CARD
Contec Frequency Converter, CPU-SB20/128 (FIT)GY, WARRANTY
Contec Fingertip Pulse Oximeter - Yellow
Contec Fingertip Pulse Oximeter - White
Contec Fingertip Pulse Oximeter - Blue
Contec Fingertip Pulse Oximeter - Black
Contec Finger Probe Pulse Oximeter
CONTEC FDA ICU CCU Vital Signs Patient Monitor,6 Parameters CMS8000 ,2Y Warranty
Contec FA-UNIT F8DR C8-KF1333 System Control Computer KAB11000/U01-2 works
CONTEC FA-PAC (98)S FA-PAC Industrial I/O EXPANSION CHASSIS WITH CARDS & CPU
CONTEC factory Promotion,Free Gel+Headset,No Screen
Contec EPD-37 Screw Terminal
Contec ELMOP3IR Edgeless Mop Twist Tube Sterile - FREE SHIPPING
CONTEC ECG80A HANDHELD ECG MONITOR WITH PRINTER , REUSABLE ELECTRODS--USA SELLER
CONTEC ECG300G 3-Channel 12-lead ECG-EKG FDA SHIPPED AND SERVICED FROM USA
CONTEC ECG100G 1-Channel 12-lead ECG-EKG FDA SHIPPED AND SERVICED FROM USA
Contec ECG 80A Hand-Held Single Channel 12 lead EKG with disposable electrodes
Contec DTP-4C Screw Terminal. Brand !
CONTEC DTP-C DTPC
CONTEC DIO-3232L-PE DIO3232LPE
Contec DIO-1616B-PE, 12-24 VDC I/O board with 16 channels in/out
Contec dio-0808ly-usb
Contec Digital NIBP Ambulatory Blood Pressure Monitor Grey
Contec Digital Input Card PI-64 Lot of 2 Working
CONTEC DAI12-8C DAI128C
Contec DA12-6LC(PC) No. 9923A
CONTEC DA12-4C(98) PCB
CONTEC DA12-4 DA124
Contec Colour Wrist Watch Finger Pulse Oximeter CMS50I
CONTEC CNT24-4A-98-H CNT244A98H
CONTEC CNT24-4(PCI) *SEALED*
Contec CMS-8000 patient monitor NIBP,TEMP,ECG,SPO2 brand 1y warranty
Contec CMS-8000 patient monitor NIBP,TEMP,ECG,SPO2 , ROLL STAND 1y warranty
CONTEC CMS8000 FDA ICU CCU Vital Signs Patient Monitor,6 Parameters ,2Y Warranty
Contec CMS50DL Finger Tip Pulse Oximeter Blood oxygen SPO2 monitor oximeters,FDA
Contec CMS-50D Fingertip Pulse Oximeter
Contec Cms5000 Portable Patient Vital Signs Pr/Spo2 Monitoring
Contec CMS5000 Multi-parameter,Patient Monitor NIBP, Pulse Rate, SPO2
Contec CMS 50-DL Finger Tip Pulse Oximeter Blood OXygen OX SpO2 Monitor CE FDA
Contec CM32(PC) Check Mate
CONTEC CM32 (PC) CHECK MATE PC-HELPER FOR IBM PERSONAL COMPUTER CM32PC
CONTEC CLEANTUBE POLYESTER TUBE WIPER LWTW0016 ~ CASE OF 500 ~ IN BOX
Contec Circuit Board DDC-2VS #51107
CONTEC BUS-PAC(PC)E No. 7024D PLC Module Adapter PCB
CONTEC BUS-PAC(PC)E No. 7024D PLC Module Adapter PCB
CONTEC BUS-PAC [98]E 7022B BOARD
Contec Bus Expander PC Card BUS-PC (CB) SF
Contec BLMOP EasySat Bucketless Floor Disposable Mop Head System 60848144
Contec Bi Directional TTL Digital I/O Board PIO-96W(PC) No.9615C
Contec Anticon Sterile 100 Cleanroom Wipers # 492226-939 - 22.9 x 22.9cm, 20 pk
Contec AMVL0002 Amplitude VIP-L Knitted Polyester Wipes, 9x9 Wipers, 300 Per Bag
Contec AMEC0004 Amplitude EcoCloth Absorbent Wipe 12X12 in/150 per pack/ 2 PACKS
Contec Ambulatory Blood Pressure Monitor Grey
CONTEC Ambulatory Blood Pressure Monitor +USB Software 24h NIBP Holter ABPM50
CONTEC ADI12-16(PCI) *SEALED*
CONTEC ADI12-16(PC) PC BOARD *FACTORY SEALED*
CONTEC AD12-16PCEH AD1216PCEH
CONTEC AD12-16 AD1216
CONTEC AD12-16 ANALOG INPUT BOARD FOR PCI 5VDC SINGLE END 16CH DIFFERE
CONTEC Abpm50 Ambulatory Blood Pressure Monitor with Cd Software +For Continu...
Contec 9168C, Serial SIX1492, Stamp ID FAA06742, 1223329, Shipsameday #130J
Contec 7177-1117W White Context Cleanroom Paper 250 Sheets 17 x 11
Contec 7177-1117B Blue Context Cleanroom Paper 250 Sheets
Contec 7089A P10-16/16L(PC)V Digital I/O Board
Contec 24 Hour Blood Pressure
Contec 08A Digital NIBP Ambulatory Blood Pressure Monitor with PC Software 08A
Contec 08A Digital automatic blood pressure monitor for adult
CONTEC #ELMOP3 Edgeless Mop Head, White Tail Band, Cleanroom Laundered (1 / bag)
CMS8000 ECG+NIBP+SPO2+RESP+TEMP+Pr,Optional Printer/CO2
CMS50DL1 Contec Fingertip Pulse Oximeter. Blood Oxygen, Pulse Rate, SPO2.
CHILD SIZE Cuff with extension tube for CONTEC blood pressure monitor 08A/08C
CHILD SIZE Cuff for CONTEC blood pressure monitor ABPM-50
CE&FDA Approved Digital Blood Pressure Monitor (CONTEC 08C) USA SHIP
CE Ultrasound Monitoring System,Prenatal Heart Monitor,3MHZ Probe+Gel,Sonoline B
CE FDA,LCD Hand-held Pocket Fetal Doppler,Baby Heart Beat Monitor+ Free GEL
CE FDA US Seller!LCD Hand-held Pocket Fetal Doppler,Baby Heart Beat Monitor+Gel
CE FDA Sonoline B Fetal heart doppler/Backlight LCD 3mhz Probe + gel,2Y warranty
CE FDA LCD Hand-held Pocket Fetal Doppler,Baby Heart Beat Monitor+Gel,Sonoline B
CE FDA LCD Hand-held Pocket Fetal Doppler,Baby Heart Beat Monitor+ Gel, 3M Probe
CE FDA Hot Hand-held Pocket Fetal Doppler,Baby Heart Monitor+Gel,3MHZ Probe
CE FDA Hot Handheld Pocket Fetal Doppler,Baby Heart Beat Monitor+Gel,3MHZ Probe
CE FDA Handheld ECG/EKG machine 12-Leads Single-Ch ECG+PC Software+Printer&Paper
CE FDA 3M Probe,LCD Hand-held Pocket Fetal Doppler,Baby Heart Beat Monitor+ Gel
CE 3.5" LCD FDA Portable ECG/EKG machine 12-Leads 3-Channel ECG+Printer,Software
CE & FDA Approved. Immediate UK Dispatch.
Case of 12 Contec ELRSOC Clean Room Spill Control Sock & Pillow Sock
BULB FOR CARLEY 70082, CL70082, CONTEC, LS6000 , LUXTEC 9100 100 WATT
Box of 10 60grams Aquasonic 100 Water Soluble Hypoallergenic Ultrasound Gels
Bosch Contec IPC-RT/L600S(PC)TH Interface Panel IPCRTL600SPCTH
BLVKMOPIR
blood pressure monitor BP-202H Digital wrist-type fully automatic
blood pressure monitor BP-103 Digital arm-type fully automatic
Barber-Greene Contec Astec A-181-67KT A18167KT A-181R67KT Exciter Board, rebuilt
Backlight LCD, FDA Cleared, Gift Choice, Safe Use,
Baby Sound B Fetal Doppler, FDA, LCD, gel, batteries, USA seller
Baby Sound B Fetal Doppler, BABY HEART MONITOR
Baby Sound B Fetal Doppler Heart Rate Monitor, Free Gel
Baby Sound A Fetal Hetal Heart Doppler Free Gel FDA
All-In-One Blood Pressure Monitor With SPO2 Pulse oximeter & Printing option!
Adult+Child+Infant+Neonate Cuff
Adult+Child+Infant+Neonate Cuff
Adult SPO2 PROBE for CONTEC blood pressure monitor 08A/08C/PM50
Adult Cuff for CONTEC blood pressure monitor 08A/08C
ABPM-50 Ambulatory 24 hours Monitor blood pressure/patient Monitor for ADULT
60grams Aquasonic 100 Water Soluble Hypoallergenic Ultrasound Gel
50pk Contec Quiltec 1 Two-Ply 9x9" Wipes QT1-99
3MHZ Probe,CE FDA LCD Handheld Pocket Fetal Doppler,Baby Heart Beat Monitor+Gel
3Mhz FETAL DOPPLER Sonoline B baby HEART MONITOR - 2015 version Contec
3Mhz FETAL DOPPLER Sonoline B baby HEART MONITOR - 2015 version Contec
3 - Contec EL-MOP White Polyester Knitted Fabric Tube Edgeless Mop
2-Contec ELRSOC EliminatR Disposable Cleanroom Spill Control Sorbent Sock, 36"
2015 USA Factory FDA Digital ECG/EKG machine 12-Leads One Channel+Printer&Paper
2015 USA CONTEC FDA CMS50DL Fingertip Pulse Oximeter,SPO2,PR Monitor,Black Color
2015 FDA Digital Single Channel 12 lead Portable ECG/EKG Machine ECG100G+printer
2015 FDA Digital Single Channel 12 lead Portable ECG/EKG Machine ECG100G+Printer
2.7" USA Factory FDA Portable ECG/EKG machine 12-Leads One Channel+Printer&Paper
2 Each Contec PCB-3(PC) 7007B Stepper Motor Controller
16 Contec VertiKlean Sterile Cleanroom Mop Heads VK-MOP64IR
150 Contec Anticon Gold Hey Weight 492224-792 Ultra Clean Room Polyester Wipes
12/bx Contec VK-MOP VertiKlean replacement 7" Mop Heads for Wall Cleaning
12 Channel ECG Holter ECG/EKG 24 Hours Holter EKG Monitor+Software,TLC5000
1 PC Good CONTEC GP-IB (PCI) F GPIB
1 CHILD SIZE Cuff with extension tube for CONTEC blood pressure monitor 08A/08C
08C Digital automatic blood pressure monitor with spo2 for adult
08C Digital automatic blood pressure monitor for adult
08A Digital automatic blood pressure monitor with spo2 sensor for adult
*Vintage* Contec COM-4M Multi-Channel Asynchronous Board for IBM PC
(FS) CONTEC PIO-16/16L (PC) V u DIGITAL I/O 7089A OPTO-ISOLATION PI0-16/16L(PC)V
#434 CONTEC EPD-37 125V 1A Screw Terminal
高压软起动
社会发展是有阶段性的。在不同阶段，人们的生产手段、生产工具和生活用品都有很大的不同。上世纪80～90年代，的经济实力尚较薄弱，当时的小水泥和小钢铁发展很快，1000kW～4000kW电机的应用增长很快，与当时的经济基础相适应的液态起动装置出现，它经济实用，解决了电机起动中的一些问题。对当时的经济发展起到了的作用。到世纪之交时期，经济实力已有较大的发展，生产手段和生产工具亦有了较大发展，电机容量也有了很大增长，人们开始不满足液态起动装置的低性能，于是晶闸管串联式（固态）软起动装置的应用开始增加，继而又出现了开关变压器式软起动装置和磁饱和电抗器式（磁控）起动装置，变频装置用于电机软起动的情况也越来越多，当前这四种产品是大型电机起动市场的主品，液态起动装置则应用在小型（5000kW以下）电机上较多。另外，两种老式起动方法（自耦变压器和变压器-电动机组）也常常出现在20000kW以下电机的起动上。
大型电机驱动的设备一般都是企业的核心设备，直接影响企业的生产状况，因此人们应该对其起动给予特别的关注，合理的选择起动装置将给企业带来很大的经济效益。但是电机起动技术毕竟不是一个企业的核心技术，许多企业的电气工作者很少有时间来研究起动方法之间的差别，往往会造成不恰当的选择，有时甚至不得不做出第二次选择，给企业造成不应有的损失。因此，如实地说明起动方法的性能及其差别是非常重要的。为此我们在这方面做抛砖之尝试，如有不完善和不妥之处，望不吝添金加玉。
引起电网电压波动，影响同电网其它设备的运行
交流电动机在全压直接起动时，起动电流会达到额定电流的4~7倍，当电机的容量相对较大时，该起动电流会引起电网电压的急剧下降，影响同电网其它设备的正常运行。
软起动时，起动电流一般为额定电流的2~3倍，电网电压波动率一般在10%以内，对其它设备的影响非常小。
⒉对电网的影响
对电网的影响主要表现在两个方面：
①超大型电机直接起动的大电流对电网的冲击几乎类似于三相短路对电网的冲击，常常会引发功率振荡，使电网失去稳定。
②起动电流中含有大量的高次谐波，会与电网电路参数引起高频谐振，造成继电保护误动作、自动控制失灵等故障。
软起动时起动电流大幅度降低，以上影响可免除。
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