研究根据电气线路和设备表面温度场的变化，通过建立数学模型和数据库，对电气线路和设备的故障隐患进行在线诊断。集红外热象测试技术、传热学、电工学和计算机技术为一体，具有非接触、在线诊断、准确给出故障位置等特点，能精确发现温度场异常点，确定隐患等级，推测隐患的发展程度。 Based on the changes of the temperature field of the electric circuit and the surface of the equipment, a mathematical model and a database are established to diagnose the hidden faults of the electric lines and equipments on-line. Set of infrared thermal imaging technology, heat transfer, electrical engineering and computer technology as a whole, with non-contact, on-line diagnosis, accurate fault location and other characteristics can accurately identify the temperature anomalies, determine the level of hidden dangers, speculation of the development of hidden dangers degree.