The invention relates to a power
transformer on-line monitoring device and method based on the transient
oil pressure characteristics. The power
transformer on-line monitoring device includes a transient
oil pressure characteristic quantity measurement module, a
signal conditioning and acquisition module and a digital
processing analysis module, the transient
oil pressure characteristic quantity measurement module is connected with the
signal conditioning and acquisition module, the
signal conditioning and acquisition module is connected with the digital
processing analysis module, and a datastorage module, a man-
machine dialogue module and a data
communication interface module are all connected with the digital
processing analysis module. According to the power
transformer on-line monitoring device and method based on the transient oil pressure characteristics, transient oil pressure characteristic information of a plurality of measuring points inside a
transformer oil tank are obtained in real time, an operating oil pressure value representing the oil
pressure range of a transformer is calculated, and by comparing with a preset
overpressure threshold value and a quasi-
overpressure threshold value, whether abnormal
overpressure of a measured transformer occurs or not is judged; and the device is independent of a power network, and has the advantages of simple composition, easy implementation, reliability and accuracy, and the like.