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  1. Ants

    Phase rotation and synchr testing of remote sources

    I currently have the enviable opportunity to supply my manufacturing plant with more than one electrical source for backup purposes. Essential to this is both phase rotation and synchronisation as a fast transfer must be initiated. I am looking for a method of comparing these, taking into...
  2. Ants

    Large motors preservation in stores/wharehouse

    We are in the process of building a new plant, and as things go some equipment arrive very early and some very late. My concern lies with the preservation of rotating as well as non-rotating equipment. Firstly, large (and other sizes) motors needs to be on space heaters (if facility is provided...
  3. Ants

    Medium voltage captive transformer specification

    Good day gentlemen! I am currently investigation the possibilty of upgrading a 5 MW 6600V 3phase motor to about 6.2MW (not yet standard size). My problem is that it feeds from a captive transformer (is this term used worldwide?) rated 8MVA and 33kV / 6.6 KV , 4.07% impedance at 33kV. What is the...
  4. Ants

    Variable Frequency Drives: failures & contamination

    I work for a chemical plant with an inherently corrosive atmosphere. I have a large base of new technology (4 years oldest)VFD's. Over the past year we experienced an abnormally high rate of failures, mostly related no non-power elements (gate driver boards, rectifier drives boards comms cards...

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