bimbone
Electrical
- Apr 23, 2012
- 7
Hello everyone,
Perhaps the title is not the best but here I will try to explain.
Of a synchronous machine from 1,5 MVA with the star center isolated from earth, and line voltage of 400 V its connected to the grid by the trasformer MV/LV with connections D/yn.
I saw the following fact: The PE conductor (yellow green) from the frame of synchronous machine goes to the star center of the transformer, then to the earth, has a 50 Hz to 40 A. My explanation is as follows, the synchronous machine having the frame connected to earth but not the star center, on that loop is colosed the capacitive current that arrive from coupling between capacity of the windings stator and frame,
And then close the center of the transformer.
According to you this maybe a plausible explanation?
Have some suggestion about it?
Maybe i must find the problem in the shaft currents or voltge?
Perhaps the title is not the best but here I will try to explain.
Of a synchronous machine from 1,5 MVA with the star center isolated from earth, and line voltage of 400 V its connected to the grid by the trasformer MV/LV with connections D/yn.
I saw the following fact: The PE conductor (yellow green) from the frame of synchronous machine goes to the star center of the transformer, then to the earth, has a 50 Hz to 40 A. My explanation is as follows, the synchronous machine having the frame connected to earth but not the star center, on that loop is colosed the capacitive current that arrive from coupling between capacity of the windings stator and frame,
And then close the center of the transformer.
According to you this maybe a plausible explanation?
Have some suggestion about it?
Maybe i must find the problem in the shaft currents or voltge?