Hello,
We are currently simulating the motor starting of some large medium voltage motors.
I have some questions that I hope to receive your feedback to understand:
1) Manufacturers' catalogue state intertia. Is this value the inertia value for the motor without load, I mean, only the rotor...
Hello,
I would like to receive your feedback related to shortcircuit analysis using IEC 60909 methodology to calculate two phase and two phase to earth faults because, there are not all of the currents determined by the software.
We already read the standard and it talks about only initial and...
Hello,
I would thank your advice about the following:
From the technical data sheet of a slip ring motor, we have:
Starting time of 25 seconds
Stall time (cold/warm) 3/2 seconds
We think there is an error because the stalling time should be longer than the starting one, isn't it?
Any...
Hello,
I am in doubt about the correct ANSI factor to determine
the damage curve of a transformer.
According to the well know procedure, it is said that if the transformer windings are delta-delta a factor of 0.87 has to be considered for all current values.
In the same way, if delta- wye...
Hello,
I would like to receive your feedback about:
How can we determine the number of starts per hour or allowable conscutive startings of a motor?
If we have not available information, how can we specify this??
We have read that NEMA defines a typical 2 colds/1 hot starts, this could be a...
Hello everybody,
Does anybody know something about short courses for stability (the basic concepts) and also for harmonic filter design?
I will thank your answers/comments
Best Regards
Hello friends,
I would like to receive some feedback from you related to how to size the zero sequence CT for a Micom P211 relay.
In this case, there are no CT's in each one of the phases and we will use an external "window CT" to sense zero sequence current and in that way providing a 51G...
