Method for online monitoring capacitive voltage transformers

The invention provides a method for online monitoring capacitive voltage transformers. The method includes the steps that secondary voltage data of the capacitive voltage transformers of transformer stations in a monitored area are acquired based on an energy management system; the secondary voltage data are associated with information of transformer equipment corresponding to the transformer stations; failure state information of the capacitive voltage transformers is judged according to the secondary voltage data; operating states of the capacitive voltage transformers of the transformer equipment of the transformer stations in the monitored area are monitored according to the failure state information. According to the method for online monitoring the capacitive voltage transformers, hardware equipment does not need to be additionally arranged, the operating states of the capacitive voltage transformers can be online monitored in real time, monitoring cost is low, safe and reliable operation of an electric power system is not affected, and the method is suitable for being widely popularized and applied to the electric power system.