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電動機常見的故障可分為對稱故障和不對稱故障兩大類。對稱故障包括:過載、堵轉和三相短路等，這類故障對電動機的損害主要是熱效應，使繞組發熱甚至損壞，其主要特征是電流幅值發生顯著變化;不對稱故障包括:斷相、逆相、相間短路、匝間短路等，這類故障是電動機運行中*常見的一類故障。不對稱故障對電動機的損害不僅僅是引發發熱，更重要的是不對稱引起的負序效應能造成電動機的嚴重損壞。因而，對大型電動機進行綜合保護非常重要。

PROFORT810 PF810-ASEL

HARMONIC MDD04-3D20-E100AL-SP

AERA MFC FC-D980C 500

MKS MFC M-330

DEVICENET NA-9112 ST-121F

DEVICENET ST-222F

OMRON CJ1W- II101 

OMRON CJ1W- OD263 

AERA MFC FC-D980C 3000 

AERA MFC FC-D980C 50 

SECRON MT4-0204

SECRON SRE0302010

TOWA MT4-0204

OMRON CJ1W- PA202

VEXTA A4020-90215HGE

LINTEC LC-1100M-6

SEIWA HCP-05

HD RH-8-50-PM-SP2

YASKAWA SGMPS-01ACA21  

ORIENTAL BHI62ST-G2  

MKS 640A13TW1M62M  

KAIJO MOS SVC-004A 

SIEMENS 6ES5-188-3UA12 

SIEMENS C98130-A1155-B21-2-7 

YASKAWA SGMAV-02A3A21 

SURUGA SEIKI KH0604-LM  

FESTO NRK-3-PI-24  

FESTO NRK-3-PI-24-SA  

PANASONIC ADKA100GVTAAA  

YASKAWA USAREM-05CFJ11  

SAMSUNG CSMZ-04BA1ANM3  

YASKAWA SGD-01BH  

PANASONIC MSDA041A1A  

KENSINGTON 4000-60002  

KENSINGTON 4000-60053-00  

POWER C98040-A1728-C3-07-43  

YASKAWA SGMP-08A314  

MINICOM K-386-02  

AERA TC FC-PAR781C-BW  

VEXTA PK596AW1-H100  

OKI 2PU4005-5362  

MINICOM DI-128PC K-330-01  

MINICOM CPU-86V K-337-03  

MINICOM P0-32RL K-331-OI  

MINICOM K-388-02  

ADTEK aISA-P31B  

KOLLMORGEN AKM22C-ANCNR-00  

TEL TOKYO BOARD 3M81-024340-13  

COMIZOA COMI-LX508  

CONTROLOTRON SK1750-430A  

CONTROLOTRON SK1750-430  

COPYRIGHT PIO-9032B-SB  

NIDEK S1717-PC2779  

DRESSLER FMBC-0932-2510  00000000000000000000000000000000000000000000000000000000000000

SANYO PU0A015EM51P00  

SIEMENS 6ES5095-8MA03  

TEL 3M80-001585-12  

OPTICAL 03-13694-04  

SCHEM 07-13694-04 

OPTICAL 03-13573-01 

OPTICAL 07-13574-01  

Fanuc A20B-1000-0472/02A  

ATG SB-90-30-P1  

PARKER S57-102  

SUGAI F801-M NN-NNN-5N  

SMB 3ALH-0160-30-5-560  

Fanuc A14B-0075-B120-01  

Fanuc A13B-0073-C001 

Fanuc A20B-C008-0280/05B  

GALIL DMC-2143  

GALIL D6-2804C  

MITSUBISHI FX2-128MT