Transformer-cutting-off no-load overvoltage on-line monitoring system used for finery transformer in steel plant

The utility model relates to a transformer-cutting-off no-load overvoltage on-line monitoring system used for a finery transformer in a steel plant, comprising a primary side capacitor voltage divider connected with the primary side of a transformer, a secondary side voltage divider connected with the secondary side of the transformer, an industrial control computer and an alarm device, wherein the capacitor voltage divider transits the overvoltage of the primary side of the transformer to be detected to the industrial control computer, the secondary side voltage divider transits the overvoltage of the secondary side of the transformer to be detected, and if the monitored overvoltage signal exceeds a threshold, the control alarm device gives an alarm signal. Transformer-cutting-off no-load overvoltage on-line monitoring system used for a finery transformer in a steel plant can detect the overvoltage of the transformer to be detected, also can display the detected overvoltage in real time, and gives an alarm s