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  1. registigger

    Whats the most effiecient motor to use as generator?

    Your turbine controller will need to be more elaborate than a simple resistor driving the solenoid valve. First of all, this is likely to consume a large part of the energy you are producing. Then the chances are it will not be stable. You need a something similar to a PID controller. This...
  2. registigger

    Setting of earth leakage protection relay

    Thank you jraef. I have read the adjustment instructions from various manufacturers of protections relays and they advise to set the relay above the tripping threshold under normal operation. I have advised the customer to raise the setting by 50%. This transformer is dedicated to the drives...
  3. registigger

    Whats the most effiecient motor to use as generator?

    The best way depends on many parameters. If you only make one of these, you have the motor and it works, it is the best way. If you intend to produce hundreds, you might want to look at DC motors or induction motors or servo motors. With the proper drive you will get a high efficiency. Do...
  4. registigger

    Setting of earth leakage protection relay

    Thank you skogsgurra. I will look into it.
  5. registigger

    Setting of earth leakage protection relay

    What would be an acceptable setting for an earth leakage protection relay supervising a 1200KVA transformer on the 480V secondary (about 1440A line current). This relay used to be set at 2.5A and had not tripped for years. Recently, high power AC drives have been added to the feeder using most...
  6. registigger

    SKiiP IGBT module failures

    Could everybody that has had any Semikron SKiiP failures contact me? Thank you. marcot@imalog.com
  7. registigger

    Must i isolate?

    I agree with our colleagues above. Isolation is not mantatory but here are a few more details to take into consideration. 1-If your product is medical or in a wet environment, you might have to isolate anyway to prevent exposing operators or patient to high frequency current when touching the...
  8. registigger

    SKiiP IGBT module failures

    Thank you for this tip. Unfortunately, this problem has been happening on many different systems. All these details have been thorowly checked by many experts. We have lost many dozens of SKiiPs IGBT modules over a 2 years period at a most of our sites. Semikron's experts came twice to take...
  9. registigger

    SKiiP IGBT module failures

    We have been experiencing a high rate of failures of Semikron's SKiiP IGBT module. Anybody had the same experience? marcot@imalog.com
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