Hi,
I am working on an underground cable system where there are some telephone cables in the vicinity of the new cable.
I am looking at the study supplied by the contractor on the induced voltage on the tele cables and wanted to do a double check on the calculations.
I have found a CIGRE...
I forgot to mention I am not from the states and there may be requirements for an "Equipment bonding Lead"
check this threadhttp://eng-tips.com/viewthread.cfm?qid=271948&page=2
All of the questions about bonding and induced voltage are related to dealing with voltages and circulating currents in the screen of the cable.
So if you have no metallic sheath (screen), then no problems with circulating currents or induced voltages.
As far as the earthing goes, I am no...
Hi There,
I am working on quite a large project with a 600 line proramme.
We have had several restructures of the programme and every time the programme shifts, I have to move a repeated unit of work (a section of cabling) and re do all of the links between each work section. Takes ages and...
I guess it is possible the Equipment schedule is a confirmation list of equipment with quantities.
Equipment Spec would then have each item on the schedule with a specification of its properties and performance.
Is this for tender or for construction?
I accidentally spent a day looking through the entire archive. I really like about 30% of them. the 70% are worth it to get to great ones.
you can also look at explosm.net, its more juvenile though.
Sorry to be blunt here but,
They are probably the most open and ambiguous questions you can ask.
If you want some valuable answers you need to ask more specific questions other than "How do I manage Project X?"
What are you particular concerns? What stage is the project at? What is the next...
GhostBuster,
Thanks for the post! Thats a very similar situation to what I have.
7anoter,
Whoa! Thats the sort of detail I needed. I havent fully tried the application myself but I'll spend some time trying it out. Thansks. (Star for you!)
Wareagle,
itsmoked is quite right. The effects...
If you are in the US MIT has a degree called Biological Engineering.
The idea behind it is that the systems you are manipulating are biological systems.
Check it out if you are interested.
Thanks,
Andrew
Ok, the picture I am getting is that the Loop of steel will act like the core of a CT. (Circular Magnetic Field)
Eddy currents will be formed around this circular field.
The current density in the object will be the main variable dictating heat dissipation.
Current Density seems to be...
Hi Scotty,
The Cable passing through the steel loop is single phase,
The system is 50Hz AC to clarify also.
David,
I agree that the steel structure surrounding the cable is like the Core of a CT. However, my understanding was that the core of a ct is then wrapped in copper coils. The flux...
Hi DPC,
Thanks for the reply.
I am familiar with the situation of a steel conduit.
In this situation, I have steelwork that is surrounding the cable. I am told that under normal load, the steelwork may heat up.
Under fault conditions some sparks could be expected at the bolted...
Hi,
I am aware that when a single phase cable is enclosed by a ring of ferromagnetic material that it can heat up and cause damage to insulation. This I have learnt from previous posts.
My problem is that I need to justify this in a report to my client.
We have a HV Cable 132kV with an...
I gather that the concerns of the Maintenance staff is that if the operator were to close the breaker on the transformer there could be someone working on the line. The operator is not aware of the people working on the line and closes the breaker anyway.
(Note: You dont really turn on a...
