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  1. trobgherian

    Inadvertent core ground on transformer

    I have an inadvertent core ground on a power transformer. I want to add a resistor to the designed core ground and rely on the inadvertent core ground. My goal is to minimize the circulating current as a result of the inadvertent core ground. What size resistor should I use? I am thinking 10...
  2. trobgherian

    Canvassing Substation Battery Testers

    Hello, I work for a Midwest utility as a substation maintenance engineer and am wondering what battery testers are generally used on substation batteries. We use a Megger/Biddle BITE2, which tests cell impedance, strap impedance, and cell voltage. Is this common? Have there been problems...
  3. trobgherian

    Finding LRC from NEMA MG 1 "Code Letter"

    How do I determine the locked rotor current of a motor if I know the Code Letter from the nameplate? The motor is a 460V, 10 HP motor with code letter "H". Thanks

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