During dielectric moisture analysis of power transformers, where is the measurement typically taken?

In dielectric moisture analysis of power transformers, the measurement focuses on the bushings to assess their dielectric properties. Bushings are critical components that serve as insulators and connect the transformer to external conductors while maintaining electrical isolation. They are filled with oil or other insulating materials that can absorb moisture over time, which can adversely affect the bushing's dielectric strength. By measuring the dielectric properties at the bushings, technicians can determine the moisture content and the insulation's health, which is crucial for ensuring the reliability and longevity of the transformer.

The correct choice underscores the importance of the bushings in evaluating the insulation system's condition, particularly regarding the potential degradation due to moisture. This measurement is a key part of preventive maintenance strategies that help in diagnosing issues before they lead to transformer failures.