Hi all. Can you please confirm what is approximately the noise level contribution in a pwoer transformer: i.e. what percentage is due to the tank, how much is due to the fans and how much due to the pumps in a FOA system.
Thaks,
EddyPach
Hi gents,
Do you know a website where I can get a quotation for a SCADA system for digital communication of alarms, protection and so on for 7 transformers? Off now, somebody can calculate an estimate? Will that be a four or five digit number?
Thanks in advance
CAn you please tell if there is a website where I can find a diagram to build a home-made alarm system? There may also be a kit to build. What is a cost-effective solution based on, diaphragms, infrareds, motion detectors?
Thanks for the info.
Can you please indicate where I can find a good stepping motor manufacturer. I want to move a band that will carry wet calf skins, and want to be able to stop it every 30 seconds for 5 or 10 seconds.
Does somebody know the approximate price for a General Electric Faraday TMMS (Transformer Monitoring Management System)? Is there another suitable make for this kind of device? We know this system can be arranged to include a sort of features and hence it should not be cheap!
Thanks for the info.
Does somebody know the approximate price rate of a turbine vs. a power transformer, and why this should be so? i know turbines cost far more, but by how much? and why?
Thanks for the info.
Basic questions,
Can somebody provide the formulas to calculate:
the reactance at the OA rating in a 3 phase 126/168/210 MVA, 230 -18 kV power transformer?
the three phase capacitance to ground on the high voltage side?
the three phase capacitance to grond on the low voltage side?
Thanks in advance
Can somebody explain what would be the effect of changing the H-Y (high to tertiary) impedance in a 120/160/200 MVA, 260-144/25 kV, three phase autotransformer, from 12% (required) to 26% (per design). The H-X impedance is 5%.
Thanks for the info.
Is it possible to analyze a transient using the FFT (which is the case with the inrush current when energizing a power transformer)? Or is this technique applicable only to waves with armonic distortion? in other words, we are assuming that the inrush current is a transient and does not generate...
Can somebody tell me why a +/- 7 1/2 % on-load tap changer should be prefered versus a +/- 10% one? For some reason the last one seems more reasonable. It is required in the LV side of a 230 -115 kV Autotransformer.
Thanks for the advise.
Can comebody suggest a good photodetector that will provide a signal when mettering at a 1 to 2 cm distance from a wet surface? The idea is to measure 1 for the existence of calf skin, and zero when there is no skin. ( I am designing a skin meter).
Thanks for the advise.
Can somebody tell me where I can find info on a a good RFA equipment from a good make? When asking for that equipment, which should be the paramenters to watch out if the equipment will be purchased?
Thanks for the info.
Can somebody tell me if it is feasible in a bank of three, to replace 2 x 65 MVA, one phase, 400 kV units with 1550 kV winding BIL, and keep a third one that is 1425 kV BIL rated? It looks weird that the bank should be split in 2 transformers with 1425 BIL and 1 with 1550 kV wqinding BIL.
Somebody knows how to calculate the harmonic content of the inrush current during the initial energization of a high power trnasformer, from the high voltage side?
