It is a 30 MVA unit. The voltage is 138/34.5KV. The test is acceptance testing as the unit has yet to be put in service. It is a mobile transformer that has Nomex insulation if that makes a difference. We are doing the PD test at twice voltage and 3X frequency and we are monitoring from...
We have a small power distribution transformer that is showing relatively high levels of PD (600pC) and we are trying to determine the cause. The transformer is less than 3 months old. Last night we pressurized the unit to 10psi and the PD level dropped to 200pC. My thoughts are this is a...
I thank you for your comments. Lesson learned. I can't do everything myself. Sometimes I get hard headed and just keep on pushing.
Oddly, the outcome was fairly positive. It seems the incident brought the lack of product support to the forefront of the heads of the company and now I have a...
No. I have not received ay training of any type except for the basic safety stuff. I am actually heading up all of the technical training for my company. Like I said, it wasn't the hit, it was the fact that it happened due to lack of support for the product. Now it's damage control.
Right...
@BigTomHanks - I'll have to agree with you on most of this, except I don't think this is the end of it. There was an issue last week where I got irritated and had to step around him for support (and finally got it). There was also a situation where he asked me to do some stuff I felt was...
@Kenat - I asked about it but I never got a straight answer. The fact of the matter is that I didn't abandon my responsibilities, but did abandon my usual take over of other's responsibilities and basically said "it's your job, you handle it".
What I did get was that the reason for filing the...
That's just it, I didn't leave my responsibilities, or at least I don't think I did. I walked away after I completed the move. The entire plant was at the Christmas party during the move and I was the only one working. When the plant came back to work, I was still cooling off, but my...
I guess it goes without saying that you are unsatisfied at your current place?
One thing a friend of mine did that worked in this situation is to bring it up with his boss but did not tell him he had an offer. He simply stated that he was becoming dissatisfied with his workload (it had...
I'm sure many people have issues like this, so I am asking for opinions on what I should do about my situation. I am a young engineer and therefore I am looking for advice of those more experienced and wiser than I am.
A little background:
I have headed up a new department at work for...
Well I have a good start now. The transformer theory is getting to be a monster, though... We'll see if the power's that be will let me bring in some professionals.
Now what I really need are a few basic electricity videos. I see no point in trying to re-invent the wheel here. I am certain...
They want me to teach theory in the first part of the course. Construction will be the second part. These are utility grade oil filled transformers. 10MVA is small to us.
The real problem for me is that I have never done anything like this before, so much of my training is going to be...
It doesn't need to be free. At this point they are willing to pay someone to come in. I am in over my head right now and I know it. I am an engineer, not a trainer. The course I am developing will be on theory. I have some models and such built and ready to go. It's just that there is so...
I'm not sure if this is the correct place to post this, but I have recently been tasked with training all of the employees in a power transformer manufacturing facility. I am supposed to teach a course on basic electronics and a course on power transformers. Basic electronics is easy. There...
I strongly second that post! In our testing lab here we tested closing our breakers at exactly the zero voltage crossing and the peak voltage on the wave. The zero crossing close pegged out ammeters. Peak of the wave close had significantly lower current and less harmonics.
This might be a...
Sure there is... sort of. A thumper will tell you where the cable treeing caused it to fail. Other than that, I know of no other way to detect insulation damage other than to remove the cable and inspect the entire thing...
What voltage are you connected to? Why not use a transformer? There are plenty that go up to 69kV that will step it down to control voltage.
If that's not an option, how about a UPS? You could run the recloser off of a distribution transformer, through the UPS. When the power is cut, the...
I'm not sure what you're asking here. Are you asking what other device you can use? I think you are limited to fuses if you can't use a circuit breaker. Circuit breakers at 110VAC are inexpensive. Why can't you just use one of them...
What voltage are the cables? How close to their current limits are you pushing them?
If this is a 480V installation and larger cables were used to keep the voltage from excessive voltage drop, I might not be so concerned as long as it passes and insulation test and the system isn't too...
The low resistance issue is the whole reason for the question. I was thinking about using this for crimp acceptance testing. If a good crimp is 10-15 micro ohms and a bad crimp is 18-20, I don't know if the instruments available are accurate enough.
I guess I will give it a try.
Thanks for...
I guess I would need to establish a baseline for each type of crimp before any measurements could be useful. What kind of variation would I expect to see between a good crimp and a bad one? 15%? The problem is that these will be tested by less technically minded people, so I need to be able...
