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  • Users: jonos
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  1. jonos

    Motor Insulation resistance was bad

    Dear All, Please, I need some advice, I have a problem with my motor. The motor with 380 V, 3 phase, 50 Hz, 2 pole, 150kW suddenly shutdown after running around 2 hours. The 50G relay (groundfault relay) was actived. I measured insulation resistance by 500VDC and winding resistance , result ...
  2. jonos

    Parameter for motor should be rewinding

    Dear All, Is there any parameter if motor should be rewinding? Is insulation resistance only can judge motor should be rewinding? Your prompt reply will be highly appreciated. Regards, jonos
  3. jonos

    Motor fan change material from plastic to stainless steel

    Dear everybody, My motor get a problem. Motor fan's was broken, original material from plastic, then I change material to stainless steel. Data of motor are rated output 75 kW, rated voltage 380 volt, No. of poles 2, IP 55, manufacture ABB Finlandia, effisiency 100%load is 94.9%...
  4. jonos

    When we use open type bearing (Non-ZZ) and closed type (ZZ)

    Dear Everybody, Would you like to give reference/article about bearing open type (non-zz) and closed type (zz)? When I use bearing non-zz and zz type? I have some information, if the motors below 15kW, is more better use bearing closed (zz) type and if the motor more >15 kW, is more better...
  5. jonos

    How To Calculate of Bearing Life Time?

    Dear everybody, Would you like to give me some information about bearing life time for a motor and how to calculate of that life time? Thank you for your attention and cooperation. Regards, Jonos
  6. jonos

    What are differences Dy11 and Dy5 for a Transformer?

    Dear everybody, Would you like to explain me about: 1. Dy11 and Dy5 connection in a transformer? 2. What are differences both of them? Thank you for your attention and explanation. Regards, Jonos
  7. jonos

    TANGEN DELTA Testing for motor

    Dear everybody, Would you like to explain me about Tangen Delta testing for motor? What is purpose? Is that important for motor? Thank you for your response Regards Jono
  8. jonos

    Starting Power Factor

    Dear everybody, Do you know about Starting Power Factor? How to know it? What is the formula? Thank you for your attention. Regards
  9. jonos

    How to Calculate/formula Current Leakage (mA) in Distribution system

    Dear everybody, Do you know how to calculate current leakage in distributin system? Usually if I want to know the current leakage, I use the Clampmeter. Thank you for your attention. Regards jonos

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