The invention is applicable to the field of electric power, and provides an intelligent electronic equipment of a transformer substation, and data sending and receiving methods and systems thereof. The data sending method comprises the steps of acquiring a data attribute value needing to be carried by data to be sent by the intelligent electronic equipment according to a pre-built information model, wherein the information model is the information model based on an IEC61850 standard, the information model defines data objects of the intelligent electronic equipment and data attributes corresponding to the data objects, content of the data attributes corresponding to the data objects adopts character strings in predetermined formats to describe the data attribute values corresponding to the plurality of data objects in the same types; packaging the data to be sent by the intelligent electronic equipment according to the pre-built information model and the acquired data attribute values; and controlling to send the packaged data. Maintenance work of the transformer substation caused by variations of the model is reduced due to the utilization of the dynamic model, so that the quantity of information items in the model can be significantly reduced, and thus resource overhead of a computer system is reduced, and a scene with extensible functions can be supported.