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  • Users: zak
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  1. zak

    Operating Voltage for 2.7MW Induction Motor

    Dear all, We have this big motor for our upcoming project(conceptual stage). What would be the most suitable operating voltage for it. Assuming that its starting method is Direct-on-Line (DOL). Our available operating voltages (at 50Hz) are:- a) 3.3kV b) 6.6kV c) 11kV Is it advisable to use...
  2. zak

    950kVA Generator cannot pick up load

    Hi, I have a standy generator set rated 950kVA 415V 50Hz. Recently we tried to commission the genset with the biggest load being 160kW (first block). However, the load cannot be transfered to the genset. The load is using Direct-on-line (DOL) starter. The allowable voltage dip during starting...
  3. zak

    Motor Service Factor

    Hi, I have a 200kW air compressor motor operating at 415V 50Hz drawing a current of about 103% of the full load current(FLA). According to the manufacturer, the motor has a service factor of 1.1. Obviously the current is still within the allowable service factor. Can I run this motor...
  4. zak

    Failed Digital Motor Relays

    Hi, We had about 30 of the above failed within a short time span on a single switchboard.We found out that some components on the auxilliary card of the relays burnt. We thought that is due to over-voltage on a particular phase only(in this case yellow phase). Is it possible? There was no...
  5. zak

    To start 55kW motor with 300% starting current limitation

    Hi, I have the above rated motor (1500 rpm) to start. Due to limited power availability from the Utility company, I cannot start the motor with more than 300% of full load current. Direct-on-line(DOL)is out of the question. I am looking at the possibility of using soft starter. However, the...

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