Electrical properties of insulating systems change due to age and continuous electrical stress. Tan-Delta, also called Loss Angle or Dissipation Factor testing, is a diagnostic method of testing electrical equipment to determine the integrity of the insulation. By measuring electrical properties such as Capacitance and Tan-Delta regularly it is possible to ensure the operational reliability of HV insulating systems and to avoid costly insulation breakdown. This is particularly important for High-Voltage Bushings, Power Transformers, Generators, Power Capacitors, H.T. cables etc. Power Electronical manufactures a variety of Tan-Delta test systems to serve the different applications of testing Transformers, Oils, Generators, XLPE Cables, Capacitors etc.