A DV/DT is another common type of winding failure in electric motors. This type of winding failure occurs when rise time in voltage suddenly increases beyond normal levels. The abbreviation “DV” indicates a change in voltage, while “DT” indicates a change in time. Along with a rise time in voltage, a larger DV/DT value can also indicate a winding failure. The larger DV/DT value indicates higher motor insulation stress levels. The rise rate in voltage is calculated by dividing DV by DT. If stress continues to affect the insulation unchecked, considerable damage and motor failure may result.