During this test for insulator, the insulating cover must remain securely installed when exposed to a minimum wind speed of 27m/s, as specified by IEEE 1656-2010 EN standards. Under extreme conditions, an alternative wind speed may be applied through mutual agreement between the manufacturer and the user. In our case, wind speed is measured using an FCO560 digital differential pressure gauge, and the main testing range covers wind speeds from 0 to 30 m/s.