Why power generated at power station is at either 11kv or 22 kv, not more than that? what is form factor?
Answer:
The form factor 1.1 was the culprit for lower voltages as the turns were in smaller number. For higher voltages 400 KV, 765 KV and 800 Kv this is not the criterion.
Form factor is ratio of average to rms.
In generating station, the generator voltage is usually not greater than 22 KV because the windings are located in generator stator slots. If you want higher voltages, then these conductors are to be insulated for higher voltages demanding bigger slot width and depth in the armature steel core laminations. If you increase the diameter of the armature then you will have to increase the rotor size too.
When you increase rotor size, the rotor surface speed reaches the speed of sound. Also, the expansion of rotor laminations due to heat has to be taken into account. If you allow more gap between stator and rotor, then there will be problem of leakage flux.
These are the limitations why the generator voltage is not more than 22 kv.
with the form factor of 1.11and emf eqn of AC MACHINE is 4.44f(flux)(turns),power generated will always be in the factor of 11.
we generate @ 13.8KV. and the ring buss is 230KV. I guess I dont understand your question.
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