flash in switchyard
flash in switchyard
(OP)
I am training to be an electrical engineer and I am doing my internship right now.
I need to find out what is an electrical flash over in a switchyard and how does it occur ?
Thank you if your able to reply.
I need to find out what is an electrical flash over in a switchyard and how does it occur ?
Thank you if your able to reply.






RE: flash in switchyard
RE: flash in switchyard
A flashover can occur for a number of reasons. Mother nature (lightning, animals) are major causes. On transmission / distribution lines, conductor sag, caused by heavy loading can cause contact with trees. Insulation failure or contamination (salty air, fog, industrial pollutants). Supporting insulators can be exposed to high mechanical stresses, as the result of through faults, which can cause damage in the porcelain, which can be further damaged by moisture ingress and compounded by freezing of the water (expansion).
Switching of long lines, capacitor banks can cause transient overvoltages.
A single phase to ground fault can cause the remaining phases to rise up to 1.732 times nominal voltage, causing flashovers as well.