There are different types of insulated windows, and they can all have the same life expectancy as a normal single pane window when no damage is caused to them. Many of the better insulated windows have the following structure: pane of glass; gas, film, gas, and another pane of glass. This sits in a frame with a seal. The biggest problem for insulated windows is that the seal breaks letting the gas escape, reducing the effectiveness of the window. This seal can break with damage to the frame.

Soldering the wires together

Aluminum wires are insulated.

Air insulated substation means air acts as the dielectric medium but in case of gas insulated substation SF6 is the dielectric medium. Gas insulated substations are having more advantages than air insulated substations.