Measurements of equivalent salt deposit density (ESDD) on a suspension insulator

Equivalent salt deposit density (ESDD) is widely used to describe the state of contaminated insulators. In this paper, a new method of ESDD on-site measurement is studied. Two types of sensors are designed, which can not only carry enough water for the contamination on the insulator surface to dissolve and cover the insulator surface with conducting solution, but also measure the conductance of the solution. The design of the sensors and the determination of the desired parameter are introduced in detail. Experiments prove that the conductance of the contamination solution is linear with the square root of ESDD of the insulator. This relationship can also be deduced by Debye-Huckel-Onsager theory. According to this relationship, the conductance measured by the sensor can be converted to ESDD. Therefore, Measuring ESDD on-site can be realized.