描述
电动机的机座外壳是接地的，如果线圈绝缘受损与铁心或外壳相碰，从而形成绕组对地短路故障。造成绕组对地短路故障的原因较多，如绕组受潮、绝缘材料变质失去绝缘能力、导线漆皮破损、电动机因长期过载发热使线圈绝缘老化变脆、铁屑等异物进入电动机内部等，都会造成接地故障。有时发生较为轻微的间歇性接地，电动机还可以起动运行；若严重接地会使电动机无法起动。另外接地故障会使电动机外壳带电，会造成人身触电的危险。
Tektronix TFP2A with 06 – 14 – 16 – 19 – 31
TEKTRONIX 764 DIGITAL AUDIO LEVEL PHASE SCOPE MONITOR
Tektronix TFP2A Fiber Master with 06 – 16 – 31- FS1315
Tektronix P7380 8.0GHz Differential Probe Tested
Tektronix ORS622 SDH/Sonet Receiver Optical
Calibrated, 30-day warranty/14-day right of return
P6964 Tektronix 34 Channel Logic Analyzer Probe
Tektronix VX4224 High Performance Counter w/opt. 10,30
Tektronix P6964 34 Channel Logic Analyzer Probe
TEKTRONIX/SONY AWG2021 WITH OPTION 1R /NIST CALIBRATION
Tektronix DPO4032 Dig. Oscilloscope INCOMPLETE DPO4000
Tektronix VX4236 6.5 DIGIT DIGITAL MULTIMETER
