Insulator hot washing with deionized water

The evolution of hot washing insulators with deionized water is reviewed and the most recent washing equipment and practices are described. The effect of increasing the effective washing distance through the use of "slick water" and the safety of this practice are investigated. The safety of using deionized water for hot washing insulators within the confined work area of low profile substations is investigated and Southern California Edison Company's minimum safe washing distances are reduced.