Damage curve of electrical equipment

[EL AABD Jamal]

Hello everybody

Can someone give me an idea where i can find Damage curves of electrical equipment, i'm studying a selectivity in an electrical substation

 

[cuky2000]

Damage curve (TCC) have a typical expression as t=k.t^2.Some information can be found as follow:
1)IEEE STD C57.109 for oil filled power transformers
2)IEEE STD C57.12.59 for dry insulation transformers
3) IEEE STD 242 (Bluff Book)& ICEA Stds for insulated power cable

 

[cuky2000]

Many commercial software have extensive library of damage curves used for protective device coordination

 

[EL AABD Jamal]

cuky2000 thank you very much