Power Transformer Through Faults
Power Transformer Through Faults
(OP)
I am interested in two aspects of Power Transformer Through Faults:
First, Have you had a transformer failure that was attributed to the aggregate accumulation of transformer through faults over the course of time? If so I would be interested in the details.
Second, I am interested in knowing of effective formal programmatic plans that identify and evaluate the aggregate effects of transformer through faults as a fault preventation and mitigation measure.
Thanks for your time.
First, Have you had a transformer failure that was attributed to the aggregate accumulation of transformer through faults over the course of time? If so I would be interested in the details.
Second, I am interested in knowing of effective formal programmatic plans that identify and evaluate the aggregate effects of transformer through faults as a fault preventation and mitigation measure.
Thanks for your time.






RE: Power Transformer Through Faults
RE: Power Transformer Through Faults
RE: Power Transformer Through Faults
It is difficult to determine if a transformer failed due to excessive through-faults since the damage done is cumulative.
In a few cases, a single through-fault will destroy a transformer due to breaker failure. But this is rare. Normally it is the combined effect of numerous through-faults over many years (along with transformer overloading).
There no question that through-faults damage transformers - that's why ANSI establishes transformer damage curves.
RE: Power Transformer Through Faults
RE: Power Transformer Through Faults
Number of faults do have an effect on the SC withstand strength of transformer.Certain types of transformers have to meet several faults in a day eg : Rail Traction track side transformers supplying power to overhead lines,transformers supplying power to steel arc furnaces.Such transformers are specially made and prototype unit is short circuit tested at high Power laborataries.
Extra Short circuit withstand strength is built in to transformers by special design/manufacturing and processing measures.CTC(continuously transposed cable)will not add any SC withstand strength.In fact SC strength is less due to smaller dimensions of the several parallel enamelled conductors constituting the CTC.But special CTC (with hardened conductors and with additional semi cured coating over enamelled conductors-which during drying process will cure and bond all conductors together giving higher buckling strength)will give extra mechanical strength for inner windings to with stand buckling forces experienced during fault current flow.
RE: Power Transformer Through Faults