Dear all
I need some guidelines how to calculate the failure rate for PFC film capacitor.
I know that increase in ambient temperature and increase in voltage, will increase the failure.
Also I think that the current and frequency of the current will have an effect on the failure rate. I just...
I think you should use a DC/DC converter at each windturbine and then use 680VDC for transmission to one single 3ph inverter.
Large 3PH inverters like this, are used in modern multimegawatt windturbines. so its kind of a off-the-shelf product today.
ABB and converteam are wellknown...
I hope some of your can help
I am currently designing windturbine controllers for a chinese manufacture
But can't find anything regarding grid codes.
does anyone in this forum know something about this?
I know that a final test in a test lab is needed, we have done it before in the company where I work.
But the price for a test is high.
It is cheaper to do some test at home, and have a 95% chance of succes, than no test at all and then only have a 50% chance of succes.
Last time we did the...
I have to design a switchgear panel that can be tested according to the specifications in IEC61641.
basicly the explosive force of the Arc should go somewhere where no people are, and the arc should stop on its own.
I have two questions:
Does there exits any standard that defines the power of...
Do anyone know how the rotor resistance in a induction machine changes during temperature change, frequency change and change in slip?
I need to know a function that descripes these relationships.
Hope you can help me.
Best regards
Robert
its copper cables, they are placed in free air and its a 3-phase installation
must tables recarding mm² size to US size says that 240mm² is equivalent to kcmil 500.
If I place the cables with space in between, would that give me a higher rating.
According to the IEC standard 4 conductors pr...
I been asked to find out how many 240mm² 90°C single conductor cable should be used for a 2150A generator at 690V, according to NEC standard. I normally use IEC standard.
the problem is, that have difficulty to find the ampacity for single conductor cables. The values i find is much lower than...
Because of simplicity of the generator and because the output of an asynchronous generator is always syncronised with the grid.
I think is called an asynchronous generator because the output frequency of the generator is not syncronised with the rotational speed of the generator put the...
