What will be the effect of putting a single phase load on an open delta...
Suppose I have an open delta transformer, 240 line to line secondary. I have a single phase constant power load I want to apply. I could apply it across either of the ‘closed’ phases and load that one...
View Articlesymmetrical components and power conservation?
My understanding of the method of symmetrical components is the following: An unbalanced three phase system (voltages, currents etc.) is split into three balanced sets; zero, positive and negative...
View ArticleWhy does a delta/wye transformer make 30 degrees phase shift ?
I’v heard that a delta/delta or Wye/Wye transformers do not make any phase shift. In delta/wye or wye/delta transformers, There is a 30 degrees phase shift between the primary and secondary coils. So,...
View ArticleMeasuring 400V three phase large consumer power
I need to measure the power consumption of a large (11kW) electrical motor during various stages of operation. I have a few interlinked questions: I’m interested in the power the operator of that motor...
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IGBT vs. SCR rectifier
I simulated three phase rectifier using a thyristor like so: I get the expected result. But if I change the thyristors to IGBTs as shown below, it does not work. Why do these two circuits behave...
View ArticleWhy do we need to install a power transformer for each high building?
I live in area where many high buildings are being built. Each building is more than 10 floors. A special room is made next to the main entrance or the garage. The room is designed for installing a...
View ArticleHow to derive apparent power formula for three phase AC system?
I know that the total power output of a three phase system is √3 EI cosØ Where E and I are the line voltage and line current. Now my question is how can one derive the apparent power equation i.e.. √3...
View ArticleThree Phase Permanent Magnet Rotor Generator Magnetization
I have a three phase permanent magnet rotor synchronous generator. The rotor was recently removed from the machine in order to repair the shaft. The motor when when run at the same speed does not...
View Articlewhy the stator frame of a 3-phase generator is made up of cast iron?
I don’t have a good knowledge of engineering materials, so please answer the following questions with reasons. Why is the stator frame of a 3-phase generator made up of cast iron? Why is the armature...
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Why is inductance negative in this triphase mutual inductor?
Suppose I have a threephase circuit with a mutual inductor on the first and second phase (V2 and V3). One way of solving the circuit (ie finding the phase currents) would be the following: convert the...
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