I am involved in design of the site servise transformer, dry type.
We have single, two phases, 3 phases loads as a heaters, lights, motors, HVAC, battery chargers, panels, receptacles ect.
If calculated total load is 100kwt, what is the size of transformer should we choose?
That type of load is...
It was not possible due the resonance/harmonics in ungrounded MV system. MV Y grounding of all transformers in parallel circuit has dropped total system-ground impedance and provided path to ground of harmonic currents, that result overvoltages and protection misfunction. We still looking to put...
Thanks.
So we need 125mcm for cable for connecting the breaker to the transformer because it should withstand 0.1 sec to fault current before the breaker trip.
But transformer winding itself made from small wires, as I assume 12 awg as well, and 10kva transformer has 100kva capacity for 5 sec...
We have Wind generators connected to 500V/36kv wye/wye step up transformers, grounded on generator side and ungrounded on MV side. Due unbalanced LV side phase-neutral voltages was decided to install additional transformer to compensate harmonics and to balance the voltage. This transformer is...
It’s very common for MV utility networks to be operated ungrounded. In neutral grounded grid, any phase to ground fault should trip the system due the high current through ground loop. Therefore, it is depend on maintenance troubleshooting practice how to minimize system interruptions and...
In our wind farm project we are thinking to disconnect concentric neutrals of the MV cables at one end in purpose to cut gronding loop as we have star-star pad-mount turbine transformer. MV system is ungrounded so that could prevent neutral floating as well . I would not consider gronding...
