Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by xchcui

  1. xchcui

    Testing compressor winding insulation with megger.

    The compressor voltage,btw,is 220V.So,i guess that even a lower minimum value is acceptable(compare to the 380v motor). Thanks alot for your help.[smile]
  2. xchcui

    Testing compressor winding insulation with megger.

    Anyone?[ponder]
  3. xchcui

    Testing compressor winding insulation with megger.

    Hello. I test an air conditioner's compressor 3.5HP with megger(500V) and i got a result,0.5MΩ. Good results should be above 50MΩ-100MΩ,while the result that i got is very low. The compressor is working very good and the current consumption is normal.So,i wonder if i did something wrong which...
  4. xchcui

    PSC motor behavior when changing run capacitor value.

    Thanks for your help[smile]
  5. xchcui

    PSC motor behavior when changing run capacitor value.

    Warros,can you expand on this case? When you mentioned the power losses(I2R),Do you mean that the main winding will consume more current in order to balance the motor?
  6. xchcui

    PSC motor behavior when changing run capacitor value.

    Waross,your explanations are very informative and i learn alot from them, But i don't understand why in my case,you say that the answer to my question is grey. There is only one variable,the capacitor,which in one time is 10% higher and in the other time is 10% lower than the oem cap. So,i am...
  7. xchcui

    PSC motor behavior when changing run capacitor value.

    Thanks for your response,but you didn't actally answer my questions. My main interset is in the current aspect. If i connect larger capacitor(+10%):what will be the current in the run winding and what will be the current in the start winding at the moment that i start the motor and what will be...
  8. xchcui

    PSC motor behavior when changing run capacitor value.

    Hi. I was browsing and read alot of articles and forums around the web and i didn't find a full explanation about the behavior of the current and the voltage in the PSC motor. Here are two situations that i would like to understand(and please, correct me if i wrong about something). 1)if i...
  9. xchcui

    Why may megger test damage motor winding,while the output current is limited?

    Thanks for all your responses. They were very helpful. Thanks.[thumbsup2]
  10. xchcui

    Why may megger test damage motor winding,while the output current is limited?

    itsmoked said,that the 1000vdc is fixed whatever the insulation resistance is, while,waross said,that the voltage is changing and drop as the insulation resistance is lower. May you clarify this issue?what will be the voltage if the resistance will be close to zero? BTW,if i make insulation...
  11. xchcui

    Why may megger test damage motor winding,while the output current is limited?

    If the megger limits the current,for example,to 1mA and i make an insulation test on 1000v,does it mean that:it doesn't matter what will be the insulation resistance, the voltage on the object to be tested will always be 1000v,while only the current will be changed? If so,how exactly does the...
  12. xchcui

    Why may megger test damage motor winding,while the output current is limited?

    Hi. When using megger,for example,to test 220vac motor winding with 1000vdc megger test, (I mentioned 1000v,instead the standard test of 500vdc on purpose,for the example). why can the megger test damage the motor winding if you apply too much voltage when testing the motor,while the current...
See more

Part and Inventory Search

Back
Top