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  1. lookingtolearn1

    Question regarding high resistance grounding units off of MCCs with significant drive loads

    Hi all, Today I noticed that a voltmeter measuring the voltage across a high-resistance ground off of a 480V bus is fluctuating between 5V-45V, with about 10 seconds between each low and high point. The bus feeds several small VSD-powered motors (30 hp or less). Is there any reason to be...
  2. lookingtolearn1

    Transformer low-pressure alarm

    Hi all, I have several 13800/480 V, 1000 kVA transformers at my site. What is your opinion on bypassing the low-pressure alarms on these transformers? They are in a non-corrosive environment, and there are monthly operator rounds to inspect each transformer's pressure level. I do not really...

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