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Calculation and selection of glass insulator for transmission line

To calculate the quantity of glass insulator in transmission line, we have to consider bellow content:

- Standard of creepage distance d:

d=16mm/kV for normal environment
d=20mm/kV for low polution environment
d=25mm/kV for polution environment
d=31mm/kV for high polution environment or near the sea up to 5km.

- Rated voltage (Udm, kV): 22kV, 35kV, 110kV, 220kV, 500kV

- Creepage distance of insulator disk (D, mm): this data shall be checked from insulator manufacturer's catalogue.

Then the quantity of glass insulator in each string is calculated by n=d*Umax/D
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