Definition - What does Lightning Arrester mean?
A Lightning Arrester is a tool used on telecommunication and electrical power systems to safeguard the conductors and insulation of systems from the detrimental effects of lightning. It has a ground and high-voltage terminal. The current is diverted to the Earth from the surge through the arrester when the lightning surge drives to the arrester along with the power line. If the protection fails, then the lightning strike will result in the introduction of thousands of kilovolts which damage the transmission lines. This can also severely damage the transformers and various other electronic and electrical devices.
Petropedia explains Lightning Arrester
Lightning Arresters are protective devices used for limiting the voltage so as to prevent equipment faults, lightning strikes or other event such as the disruption of services. They are also known as surge arresters. They are installed in electrical power systems such as towers and power poles, bus structures, steel superstructures, circuit breakers, and power transformers. They are enormous devices used in power stations which consist of porcelain tubes of several inches of diameter and several feet of length, commonly brimmed with the disks of the zinc oxide.