What type of arrestor would typically be the tallest in a 150 kilovolt switch yard?

In a 150 kilovolt switch yard, the type of arrestor that would typically be the tallest is the station arrestor. Station arrestors are designed for high voltage applications, such as substations and switch yards where they protect equipment from voltage surges and spikes resulting from events such as lightning strikes or electrical faults. They are built to handle the greater electrical stresses present in high voltage environments, which necessitates a larger physical size to accommodate their design and functionality.

In contrast, distribution arrestors are smaller and are utilized for lower voltage distribution systems. Line arrestors are tailored for specific applications along transmission lines, typically at lower altitudes or smaller scales compared to those found in switch yards. Surge arrestors also serve to protect equipment but are utilized more generally and not specifically sized for high voltage stations. Overall, the design, application, and operational requirements of station arrestors make them the tallest type of arrestor found in such an environment.