The rapid fragmentation of porcelain when a fault current travels along an insulator surface is known as a porcelain ______.

The rapid fragmentation of porcelain when a fault current travels along an insulator surface is known as a porcelain ______.

• A. Grenade
• B. Fragment
• C. Arc
• D. Fuse

Answer: (A)

When fault current travels along the surface of a porcelain insulator, the energy concentrates in a narrow path, causing intense local heating and mechanical stress. The porcelain can crack and shatter abruptly, throwing fragments outward in a rapid, explosive manner. This destructive fragmentation is what engineers and field crews refer to as a porcelain grenade. It’s different from arcing along the surface, which describes a conductive discharge path rather than a physical breakup of the insulator. The other terms don’t capture the violent, explosive breakup of the porcelain, which is why porcelain grenade is the best fit.

When fault current travels along the surface of a porcelain insulator, the energy concentrates in a narrow path, causing intense local heating and mechanical stress. The porcelain can crack and shatter abruptly, throwing fragments outward in a rapid, explosive manner. This destructive fragmentation is what engineers and field crews refer to as a porcelain grenade. It’s different from arcing along the surface, which describes a conductive discharge path rather than a physical breakup of the insulator. The other terms don’t capture the violent, explosive breakup of the porcelain, which is why porcelain grenade is the best fit.