Voltage transformer metering abnormality on-line monitoring system and method with wide area analysis function

The invention provides a voltage transformer metering abnormity on-line monitoring system and method with a wide area analysis function. The system comprises metering performance abnormity on-line monitoring devices arranged in each transformer substation and a background analysis system, wherein errors between secondary output voltages of voltage transformers in the transformer substations at thesame time are calculated according to data synchronously collected by B codes, and an error normal distribution diagram of the secondary output voltages of the voltage transformers is obtained; and the background analysis system is used for receiving the collected and summarized data of each front server, dividing the transformer substations according to regions in combination with pre-input static fixed information of the transformer substations, and centralizing the data collected by the metering performance abnormity on-line monitoring devices in the transformer substations in the same region to perform error norm