Transformer monitoring device based on non electrical quantity comprehensive characteristic information and monitoring method

Abstract

The invention discloses a transformer monitoring device based on non electrical quantity comprehensive characteristic information and a monitoring method. The transformer monitoring device comprises atransient oil pressure characteristic quantity measuring module, a transient oil flow characteristic quantity measuring module, a transient acceleration characteristic quantity measuring module, a signal conditioning and collecting module and a digital processing analysis module, wherein the transient oil pressure characteristic quantity measuring module, the transient oil flow characteristic quantity measuring module and the transient acceleration characteristic quantity measuring module are connected with the signal conditioning and collecting module respectively; and the signal conditioning and collecting module is connected with the digital processing analysis module. The action oil pressure value, action oil flow value and action acceleration value for representing the operating state of a transformer are calculated by comprehensively using a plurality of non electrical quantity transient characteristic information inside the transformer, and through comparison with preset non electrical quantity starting, warning and a pre-warning threshold, real-time monitoring and reliable evaluation for each non electrical quantity safety level inside the transformer are realized. The device is independent from a power network, and has the advantages of simple composition, easy realization, reliability, accuracy and the like.

Description

Technical field [0001] The invention belongs to the field of power systems, and relates to a transformer monitoring device and method based on non-electricity comprehensive characteristic information, which is used to measure, record and analyze non-electrical quantity information such as transient oil pressure, oil flow, acceleration, etc. inside an oil-immersed power transformer , And to achieve real-time monitoring of power transformers and reliable evaluation of their operating status. Background technique [0002] As a key power main equipment, the transformer occupies a pivotal position in the power system. Its stable operation is an important prerequisite to ensure the reliable transmission, flexible distribution and safe use of the entire power system. Especially the large power transformers installed at the system hub, because of their high voltage level, large capacity, complex structure, and high cost, once a failure occurs, it will have a serious impact on the reliabi...

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Problems solved by technology

[0007] Third, regarding the acceleration characteristics of the transformer body, when an internal fault occurs in an oil-immersed power transformer, the generation of an arc will instantly vaporize the insulating oil at the fault point to form oil vapor bubbles. Due to the expansion inertia of the surrounding insulating oil, the internal pressure of the bubbles As the fault continues to increase sharply, the refraction and reflection of the pressure wave generated by the internal components of the transformer will cause a sudden increase in the internal pressure of the oil tank, and at the same time cause deformation and vibration of the transformer body structure

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