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When acceptance testing liquid-filled transformers per NETA standards, bushing power-factor values that vary from nameplate values by more than ____ percent...

What is the approximate sum of the following two vectors? Magnitude 20 at 30° and magnitude 10 at 60°. Please explain

What will happen if one LT phase winding having finishing point as neutral connected to the other two phases having starting point as neutrals?

TestGuy is pleased to announce some exciting new improvements coming to the Tech Quiz! Our developers have been working hard to provide a better and more...

I don't know anything about cable splicing, can someone help me with the question below? If you have a manual or instruction sheet that shows the process could...

Can any of you tell me what test set or method you are using for testing turns ratio on CCVTs? Are you guys applying a high voltage to the high voltage...

So, I got this question in the practice exam: Q: The power loss in a transmission line due to charging current is best expressed as: A: Ic[SUP]2[/SUP]R/2...

I took level 3 in april and had this question on my test, i cannot find anything online or through osha that states a set time period. i believe the test had...

I have been given access to start a study group on Discord for test prep. I am thinking once or twice a week we meet and discuss topics and learn together as...

Would anyone like to participate in a online study group? I have tried passing this exam three times now and each time I am a little closer but still not...

Just took the exam, which only had a handful of questions from the practice exams (I still believe I passed), but there was no score at the end and the paper...

Does anyone have experience doing a Ground Fault verification through a neutral CT on a 5,000A Magnum SB main Breaker with a Digitrip 520 trip unit?

So, recently went onto a job to perform VLF testing of 2 sets of 35kV cables, when the customer threw a curve ball at me to test the 35kV breakers. I had no ac...

As part of our ongoing effort to make this community the best it can possibly be for our members, we are pleased to kick off a new community posting...

Hi guys, I need some help. I am testing a Dry Type 1500 kVA tranformer. Insulation tests are okay but in Ratio test my device giving an "High Execuation...

What effect, if any, does negative tank pressure have on transformer power factor? I've never known of it being an issue but another tech on site seems to...

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