This is a ground on the core steel of the transformer, not the windings. I know there are many ways of removing inadvertent core grounds. For example, an engineer from GE in Pittsfield, MA told me I could burn an inadvertent core ground in the clear with an arc welder and he has done it...
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...
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...
The "Code Letter" comes from NEMA MG 1-10.37.2. It is also called the "locked-rotor KVA per horsepower at rated voltage and rated frequency". Code letter "H" corresponds to a locked-rotor KVA per horsepower of minimum 6.30 to 7.09. So, for my 10 HP motor, the locked-rotor KVA=63000.
From...
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
