The resistance in a thyrite lightning arrester is
high at low current and low at high current
Thyrite lightning arrester is most commonly used for the protection against high dangerous voltages. When lightning takes place, voltage is raised and breakdown of the gap occurs, the resistance falls to a very low value and wave is discharged to earth. After the surge has passed the thyrite again comes back to its original position and there is no chemical change occurring simultaneously.
The resistance in a thyrite lightning arrester is high at low current and low at high current.
The most serious consequence of a major uncleared short-circuit fault could be
Which of the following results in a symmetrical fault?