On-line monitoring method and system of insulating liquid of power equipment

The invention provides an on-line monitoring method and system of insulating liquid of power equipment. The method comprises the following steps of: storing a unified insulating liquid monitoring data model in an SCD (Science Citation Database) file of IEC 61850 (Communication Networks and Systems in Substations) and sending to a monitoring center, analyzing the SCD file to generate a substation model, sending on-line monitoring data to the monitoring center, and completing a complete unified substation model file. Thus, the on-line monitoring data configured by different manufactures and different devices can be made into a unified monitoring model file through the monitoring method. The insulating liquid monitoring data model received by the monitoring center conforms to an uniform standard, so that the on-line monitoring data configured by the different manufactures and the different devices does not need to be respectively identified or does not need to be respectively subjected to conversion processing. A convenient and easy-to-use data base is provided for realizing accurate state evaluation for power equipment, and the operation stability and reliability of a power grid are increased.