PR6424/002-131+CON031

EPRO PR6424/002-131+CON031

因为，三角形接法的线电压是相电压的根号下3倍，如果星形接法的电动机误接为三角形接法，电动机会因电流过大而烧毁。

    但是，三角形接法的电动机，某些时候可以改为星形接法。

    比如，空载运行或者轻载运行。

    电动机轻载运行，其实就是“大马拉小车”，功率因数过低，运行很不经济。

    如果是三角形接法的电动机轻载运行，就可以把接法改为星形接法，这样，就可以避免“大马拉小车”。

    因为星形接法的线电压等于线电压，三角形接法的电动机改为星形接法，转矩会下降三分之二。

    所以，只有空载或者轻载的情况下，才可以把三角形接法的电动机改为星形接法。

    :一般有几种情况电动机可以星形三角形接线互换。

    一.轻载起动如中大型水泵电机可星形三角形接线互换

    二.建筑用的塔吊双速电动机靠星形三角形接线互换

    三.受变压容量限制，直接起动电动机大于变压器容量30%，应改星形三角形互换。

    有的电机标明的接法为三角形接法，有的为星形接法，有的既有三角形接法又有星形接法。这是电机厂家根据电机的定子绕组给出的标准接法。

    三相异步电动机结成星形，在380V的工作电压下，加在每相绕组上的电压只有三角形接法的1/根号3(这个符号用手机不会打)，也就是220V，启动电流为1/3。

    从以上这个关系我们可以看出，在380V相同电压下，如果标注为星形接法的电机改为三角形接法，加在每相绕组上的电压就会大幅增加，电流增大，会造成电机定子绕组发热甚至烧毁电机。当然，接法改变的同时，如果电源也改为三相220V(比如使用输出三相220V的变频器),则改为三角形后仍然可以正常使用。

    如果电机标注的接法为三角形接法，改为星形接法，则输入电源相同的情况下，加在每相绕组上的电压电流都会降低，不会对电机有什么损害，可以接线互换。改为星形后，电机的电流、转矩和功率也会相应降低。电动机的星三角启动就是利用的这个道理。

    而对于铭牌标注两种接线方式的电机，自然就可以进行连接线的互换了

170MCI00700 NEW SEALED Modicon Interbus-S Conn 170-MCI-...

 

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ASBADU206 NEW Modicon Compact Analog Input AS-BADU-206

 

140CPU43412A Excellent Tested Modicon CPU 140-CPU-434-1...

 

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140CRA93100 Modicon Quantum RIO Drop 140-CRA-931-00

 

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Modsoft Compact Modicon Programming Software

 

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140DDO84300 Used Modicon DC Out Source 140-DDO-843-00

 

140DDI85300 TESTED and Guaranteed Excellent Modicon DC ...

 

ASB875002 TESTED EXCELLENT Modicon Analog INPUT Module ...

 

170AAI03000 TESTED and GUARANTEED Modicon Momentum Anal...

 

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140CPU43412A NEW Sealed Modicon CPU 140-CPU-434-12A

 

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ASBDAU204 NEW ORIGINAL BOX Modicon Compact Analog OUT A...

 

PC-E984-265 NEW Modicon Compact CPU PCE984265

 

ASB875111 Modicon Analog Input Module AS-B875-111

 

AS-BDAP-204 NEW SEALED Modicon Compact Out ASBDAP204

 

140EHC20200 Used Modicon High Speed Ctr 140-EHC-202-00

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140XTS00200 NEW Modicon Quantum Term 140-XTS-002-00

 

140DRA84000 NEW Modicon Relay OUT 140-DRA-840-00

 

140DDI36400 Used Modicon DC In Module 140-DDI-364-00

 

140NOE77101 Modicon NEW FACTORY SEALED Ethernet 140-NOE...

 

140DRA84000 NEW FACTORY SEALED Modicon Relay OUT 140-DR...

 

PCE984385 Used GUARANTEED Modicon Slot Mount CPU PC-E98...

 

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140DAI55300 NEW SEALED Modicon Quantum AC IN 140-DAI-55...

 

140XBP00600 Modicon Quantum 6 Slot Back 140-XBP-006-00

 

140CPU65150 NEW FACTORY Sealed Modicon CPU 140-CPU-651-...

 

170AMM09000 Used Tested Modicon Momentum 170-AMM-090-00

 

140DDO35300 NEW SEALED Modicon DC Output 140-DDO-353-00

 

140NOE77111 Modicon Excellent Ethernet 140-NOE-771-11

 

PC-A984-130 Used Modicon Compact CPU PCA984130

 

140CPU53414B Used Excellent Modicon CPU 140-CPU-534-14B

 

AS8535000 Used Modicon Connector AS-8535-000

 

PCE984685 Used FULLY TESTED AND GUARANTEED Modicon Slot...

 

140ACI04000 USED EXCELLENT Modicon Analog IN 140-ACI-04...

 

140AVI03000 NEW Modicon Analog Input Module 140-AVI-030...

 

170CPS11100 Modicon NEW Momen Pwr Sply 170-CPS-111-00

 

416NHM21200 Used Modicon PCMCIA MB+ Adap 416-NHM-212-00

 

140DRA84000 NEW Factory Box Modicon Relay OUT 140-DRA-8...

 

140ARI03000 Used Modicon RTD IN 8CH 140-ARI-030-00

 

TSXASZ200 TESTED Modicon Micro Analog Output Module TSX...

 

170XTS00200 Modicon Momentum Spring Type Terminal 170-X...

 

140CPS11100 Used Modicon Power Supply 140-CPS-111-00

 

490NRP25400 Modicon Fiber Line Drop Repeater 490-NRP-25...

 

140CPU42402 Used TESTED Modicon Quan CPU 140-CPU-424-02

 

TSXP573634 Excellent Modicon Unity Premium CPU TSX-P574...

 

140AVO02000 Modicon Quantum Analog Out 140-AVO-020-00

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ASM84A002 Perfect Modicon Controller Module AS-M84A-002

 

140ACO13000 NEW SEALED Modicon Analog OUT 140-ACO-130-0...

 

140DDI35310 NEW SEALED Modicon DC In 4x8 140-DDI-353-10

 

AS-BZAE-201 Used Modicon High Speed Counter ASBZAE201

 

170AAI14000 Modicon Momentum Analog Base 170-AAI-140-00

 

ASB875101 TESTED Modicon Analog INPUT Module AS-B875-10...

 

140CPS11420 Used Modicon AC Power Sply 140-CPS-114-20

 

170INT11000 NEW Modicon Momentum Interbus 170-INT-110-0...

 

AS-BDAP-204 Modicon Compact Out Module ASBDAP204

 

AS-P120-000 Used Modicon Power Sply ASP120000

 

170ADI34000 Modicon DC Discreet I/O Base 170-ADI-340-00

 

140ARI03010 Used Modicon RTD IN 8CH 140-ARI-030-10

 

AS-BDAP-209 Modicon Discreet Output Relay ASBDAP209

 

140CPS11100 NEW Modicon Power Supply 140-CPS-111-00

 

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140NOE77110 Modicon Used Excellent Guaranteed Ethernet ...

 

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140CPS11410 New No Box Modicon Quantum 140-CPS-114-10

 

140CPS11420 NEW OPEN BOX Modicon AC Power Sply 140-CPS-...

 

140CPS12420 NEW FACTORY SEALED Modicon Power Supply 140...

 

140CRP93100 Used Modicon RIO HEAD Module 140-CRP-931-00

 

140DDI35300 New Open Modicon DC In 140-DDI-353-00

 

140ACI04000 NEW FACTORY SEALED Modicon Analog IN 140-AC...

 

TSXMBP100 BRAND NEW Modicon MB+ PCMCIA Card TSX MBP 100

 

140AVI03000 Modicon Analog Input Module 140-AVI-030-00

 

140DDI84100 FACTORY SEALED Modicon DC IN 140-DDI-841-00

 

140CPU53414B NEW SEALED Modicon CPU 140-CPU-534-14B

 

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140CPS21400 Modicon NEW SEALED Pwr Sply 140-CPS-214-00

 

TSXPSY1610 TESTED Modicon Premium Pwr Sply TSX-PSY-1610

 

140NOM21200 Modicon Used Network Option 140-NOM-212-00

 

TSXP575634 Modicon Unity Premium CPU TSX-P575634M

 

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TSXMBP100 Modicon MB+ PCMCIA Card TSX MBP 100

 

170AAI14000 NEW SEALED Modicon Analog 170-AAI-140-00

 

140DAO84210 Used Modicon Quan AC OUT 100 140-DAO-842-10

 

140AMM09000 TESTED Modicon Analog In/Out 140-AMM-090-00

 

PC-E984-265 BRAND NEW Modicon Compact CPU PCE984265

 

PM24038 4 Meg Centennial Linear Flash PC Card

 

PC-E984-245 Modicon / Schneider Compact CPU PCE984245

 

110CPU51201 Modicon Micro Controller 110-CPU-512-01

 

PCE984785 Excellent Modicon Slot Mount CPU PC-E984-785

 

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140CPS22400 Reman Modicon Power Supply 140-CPS-224-00

 

172PNN21022 Modicon Momentum Option Adap 172-PNN-210-22

 

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ASB838032 PERFECT CONDITION Modicon 24 VDC Output Modul...

 

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AS-BADU-211 TESTED AND GUARANTEED Modicon Analog Input ...

 

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ASB872200 EXCELLENT Modicon Analog OUT Module AS-B872-2...

 

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