Capacitive voltage transformer metering characteristic state evaluation method, device and system

The invention discloses a method, device and system for evaluating the metrological characteristic state of a capacitor voltage transformer, and relates to the technical field of voltage detection, and the method comprises the following steps: obtaining the operation data of the capacitor voltage transformer, building a metrological performance evaluation model, and obtaining a statistical control threshold value; operating data of the capacitor voltage transformer are collected in real time, and the statistical magnitude of the operating data is calculated through the metering performance evaluation model; comparing the statistical magnitude of the operation data with a statistical control threshold value, and judging whether the capacitor voltage transformer breaks down or not; and detecting the change trend of the primary signal and the secondary signal of the detected capacitor voltage transformer, and judging whether the metering characteristic is abnormal or not. According to the method, the time concep