Power transformer on-line monitoring device and method based on transient oil pressure characteristics

Abstract

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.

Description

technical field [0001] The invention belongs to the field of power systems, and relates to a power transformer online monitoring device and method based on transient oil pressure characteristics, which are used for measuring, recording and analyzing the transient oil pressure characteristics of oil-immersed power transformers, and evaluating the operating status of the transformer . Background technique [0002] As a key main power equipment, the transformer plays a pivotal role in the power system, and its stable operation is an important prerequisite to ensure the reliable transmission, flexible distribution and safe use of electric energy in the entire power system. With the continuous improvement of power system capacity and voltage level, higher requirements are put forward for the reliability and safety of power transformers. However, during the peak period of electricity consumption in summer, explosion and fire accidents of the transformer body caused by internal fa...

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Problems solved by technology

Under the continuous injection of fault electric energy, the internal pressure of fault bubbles also continues to rise. At the same time, due to the expansion inertia of liquid insulating oil near the fault point, the gas-liquid phase interface between the fault bubble and the surrounding liquid insulating oil will inevitably produce a significant pressure increase. , and spread inside the transformer oil tank in the form of pressure waves, resulting in an overall sudden rise in the oil pressure inside the oil tank

On the other hand, when an overheating fault occurs inside the transformer, the rise in the temperature of the insulating oil will also lead to a change in the oil pressure of the insulating oil

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