On-line monitoring method of state of relay protection equipment

The invention discloses an on-line monitoring method of a state of relay protection equipment, which ensures a content of self-inspection information provided by the relay protection equipment. The method comprises the following steps of: classifying self-inspection information; adding additional information and content thereof of each kind of self-inspection information, which is capable of reflecting the influence degree to the equipment state; collecting the self-inspection information provided by the relay protection equipment through using the IEC-61850 communication standard adopted by the communication network in a transformer substation by a state overhaul host, and building a static and dynamic self-inspection information database of the relay protection equipment; and carrying out on-line monitoring on the state of the equipment by using a general state mathematic model of the relay protection equipment in real time so as to provide the guidance for the state overhaul of therelay protection equipment. Through the on-line monitoring method of the state of the relay protection equipment, the state of the relay protection equipment can be monitored on line, the reliabilityand the usability of the relay protection equipment can be improved, the service life of the relay protection equipment can be prolongged, the operation and overhaul expenses can be reduced and the economic benefit can be increased.