We have twin EHV transmission lines approx 80km in length which are closely in parallel for their entire lengths, and are not transposed. Using Transmission Line Impedance calculators with the physical phase positions indicates that the negative and positive sequence impedances are not equal and...
I can’t find an Fortran function that rounds a real number to a given decimal place (such as ROUND(x,y) in VB). The only way I’ve found of doing it which works but is ugly is, for the case of wanting to round to the third decimal:
dummyVar = 123.456789
dummyVar = TRUNC(dummyVar * 1000.0) /...
I am trying to track down the description of a HVDC PSSE model, known as CDCAB1. Unfortunately the psse manual is a bit lacking in the description. Does anybody know where I may be able to obtain this information from- it must be out there somewhere.
Thanks
We are looking at having a 50tonne reactor moved, and one of the big issues is the weight of the device. It would be a lot less expensive to ship the device with the tank empty of the insulating oil. What are the problems which could be encountered if this was done. The reactor oil needs...
I have been asked to looked at the termination requirements for two new 12MVA 33/11kV transformers. The specific question I have is to do with the earthing of the lead on the single core cables at the termination points. Is it better to only earth one end to prevent any circulating currents in...
I am trying to study trends in load growth for our region over the past 10 years or so, to be able to predict future load growth. In forming a model, what data would be useful. i.e. I know there is a relationship between maximum demand and temperature, but what about other environmental effects...
I'm new to script programming in AutoCAD, the application I'm trying to write is to use EXCEL to automatically change the colour of lines in an existing AutoCAD drawings. I can write the Excel VB code fine, I just need to know if there is a simple way to change the colour of a line if you know...
I am having a bit of a problem with VB in Access, I can not find any methods to say whether a particular query already exits. There used to be an IfExists method which does not seem to be supported. Does anyone know how I could achieve this?
When DC pressure testing an AC MV/HV cable it is usual to test the cable using the negative pole. What is the reason for using the negative and not the positive pole considering that if a cable is likely to fail due to insulation breakdown, it is more likely to fail on the positive phase of an...
Does anyone know of any helpful websites giving information on simulation of electrical machines/ transformers/ industrial reactors/ generators, AVR's in the Matlab environment?
