The reason to install delta-wye transformers is because of the great advantage that offers: do not transmit the third harmonic, and multiples of 3 harmonics, from one side to another. Thus, your generator windings will be safe against influences from the system regarding those harmonics. True...
A good reference on the principles of busbar protection can also be found at
http://pm.geindustrial.com/FAQ/Documents/B30/GER-3984.pdf
Hope this helps too.
Searching for something else, I've discovered this document on the ABB site:
http://library.abb.com/GLOBAL/SCOT/scot201.nsf/VerityDisplay/93D973B6EC375AB1C125714A0035AD02/$File/EN_ACS800_PFC71_FWMan_B.pdf
I didn't read it, but maybe is of some help to you. See if this info applies for your...
Herr Gunnar,
Thanks for sharing the data-it's impressive and it's not so handy to find it out from other resources (I think).
On the other hand, why not encourage them to do these measurements if they have time and money for it? Let's see what they come up with. It's better to spend the money...
The Wye grounded-Wye grounded transformers, even with the Delta-connected tertiary have a major inconvenient: a grounded fault on the 34.5kV side may be ‘transferred’ on the 115kV side and the protection should be such as to not trip for this type of fault. It can be done, but at the cost of...
Unfortunately, these blackouts provide the practical proof of a wrong old engineering concept stated in the holy books of safety codes and other regulations: that ‘demand coefficient’ or however they call it, which is considered to be 0.7 – 0.9 of the installed power of the feeder. This...
If you have access to the software, it's a safe bet to assume that you have access to the technical documents, too. In the section dedicated to 'Battery Sizing', you can find some mathematical relationships needed to calculate the parameters of the required battery. See chapter V, par.E where...
To complete the answer to your question, you should be advised that in USA and Canada the most commom low voltage distribution level is 208/120 V, 60 Hz. The utility provides for each of their residential customers two phases and a neutral, and the residential wiring is designed such as the...
Answer to Q1: By mounting the reactor in series.
Answer to Q2: Consulting the documentation provided by the manufacturer/distributor, or checking out the nameplate of the reactor.
Like it or not, you need to allow some sort of inductive reactive power circulation. Almost any load, excepting capacitor banks, requires it. A PF=1 will cause a ferroresonance phenomenon which leads to a loss of stability of your system. That’s why they prefer to have PF=0.9 or (0.8 in other...
There is a theory for providing some sort of explanation about some issues arose by the magnetic materials. It is assumed that each ferromagnetic material has particular magnetic dipole domains (Bloch domains), the same way the chemistry claims about any molecule. These Bloch domains, in the...
Go to www.schneider-electric.com and perform a 'Search' (see upper right corner of the page) on Fluarc. You will get 10 docs. Take a look at them and see what you need. For example, I find it interesting...
Go to www.abb.com and perform a 'Search' on HLR. You will get 11 docs. See what you need. Maybe this one ...?
http://library.abb.com/GLOBAL/SCOT/SCOT245.NSF/0/5530b4c2929f30e7c1256ec10042f28e/$FILE/HLD%20145-%201250%20C.pdf
(copy all the row and past is onto the search line of your browser).
I could find quickly the ASEA , now ABB reference. The link is too long to be put in here, but you can do by yourself following the path
www.abb.com > Product Index A-Z > Circuit Breakers (>36 kV) and once you get here, I think what you need is a Live Tank CB type LDB D. But you can browse...
