Mode: HCL2796 HCL2796 transformer turn ratio meter is special designed for power transformer ( single phase & three phase) and instrument transformer testing, suitable for testing in sunstation, transformer manufacturer, meter manufacturer. Its helps to detedt faulty transformer winding and tap changer position. Its fully automatic device, can recognizes winding connection and vector group number of transformer winding. The user only need connect measuring cable and press start button and come out the test result. Transformer ratio changing reason Deteriorated insulation Physical damage Contamination Shipping damage If the deviation of transformer ratio and its rated turn ratio more than 0.5, its may not operate reliably. To measure small ratio changes, we need high quality accuracy turn ratio meter HCL2796.