Does anyone know of any papers/articles that discuss remote ground grids / ground fault current and their affect on wildlife? Does anyone have experience with this?
Currently working on a substations design where the sub is basically on bedrock with high impedance to earth and can't achieve...
Just looking for some information on why tap changers would be spec'd on the primary or secondary of the transformer.
Scenario - 44kV/13.8kV - delta/wye - 15/20MVA - online tap changers
Primary side taps
- This is the less expensive option
- This is the more common option
Secondary side taps...
Has anyone used equipment that has reliably traced steel and aluminum armored Teck power cables? Having issues on site when trying to trace a cable from the panel board out to the end load. Ideally would like to be able to do this live so we don't have to wait for down day to trace them out...
I have gotten involved in an energy study and the question about adding power factor correction to try and reduce line current came up. The client's design criteria currently states 0.9PF and we are looking at increasing this to 0.93PF.
As this is a energy study the question of how efficient...
Can someone confirm if this works to calculate horsepower for a motor?
I had some metering data provided on a 700hp motor. One of the measurements was kW and I was wondering if I can take this divide by 0.746 to get horsepower.
This would basically give the "electrical horsepower" then if I...
On site we have construction going on and a question was posed to me today and would like other peoples options on it.
They are going to be digging around the existing 4/0 bare copper ground cable that runs around the main building and I was asked if there is a fault to ground if there any...
I have been asked to do a comparison on different blasting technologies and I have no experience with blasting. The three technologies I have been asked to look at are conventional, Orica's I-kon system, and a PED system(Mine Site Tech). Need to find the pros and cons on each of these systems...
I have two sets of test results for our single mode fiber optic line, one done at 1310nm and one at 1550nm, I was under the impression that I should get a little higher losses at 1550nm but this was incorrect as the OTDR was showing much higher losses at 1310nm,
Can anyone explain?
Thanks
Jeff
Trying to put together a list of pros and cons for each of the mentioned. We would need 2 drives each one running a 500HP mine dewatering pump, one motor would be on all time and the other would be to pick up the slack, we would like to keep both the same to reduce spare parts so the option of...
We have had an issue on site where there was a intermittent 4th harmonic, today we finally managed to recreate the problem by energizing a large transformer.
Could anyone explain why / how this transformer is creating these?? I was always under the impressions that harmonics were usually...
I have an idea, just want someone to tell me why it's a bad idea.
I am thinking about an inverter design that does not use solid state but using a DC motor turning a AC generator. Need more out you increase the current to DC motor to increase the torque to increase the output power.
The two...
Does anyone has information on running bare copper cable through concrete? This came up in a job I am working on and my worries are that either the cable or concrete will corode creating a weak point in my ground system or concrete pad,
Thanks
dob
Got into an argument the other night about speaker resistance and what it really means.
I was fighting that this was an impedance that takes into account both the resistance and inductive properties of the speaker, basically the Z at a certian frequency.
The other guy was saying this was a...
Does anybody know of a good webiste for power systems?
I am a recent grad of electrical engineering and am trying to find a website that shows some pratical applications of power system analysis, calculations and theory.
Thanks
Dobber
Is there anyone that can direct me to a section in the OEC that states how far apart transformers have to be installed.
Right now I am tring to place two transformers outside a building, both are 13.8/600V, 1500KVA, liquid filled. I think I have all spacing requirements for the building...
I am trying to find someone with a little experience in using this fluid.
Cold start up requirements, -20C and colder
Environmental requirements in Canada,
Good stuff about it,
Bad stuff about it,
and anything else helpful to myself.
Thanks
All,
I am trying to do some step and touch potential calculations following the methods outlined in IEEE std 80, 2000.
The values I am getting are not very reasonable, I think the main problem I am having is calculating my maximum grid current, and right now I am using the available fault...
