The combination of moisture in oil and in the cellulose is an indicator of aging. The most important method for the diagnosis of aging processes as a result of dielectric, thermal, dynamic and chemical aging in the oil and oil-paper insulation is the Dissolved Gas Analysis (DGA). Chongqing Kailian Yongrun Industrial Co., Ltd offers DGA, Moisture analyzer, dielectric breakdown voltage test set, Dielectric Dissipation Factor test set (DDF) (Tan Delta test set), etc, The laboratory test equipment for analyzing transformer materials.