Transformer digital non-electric quantity protection device and method based on deflection characteristics

Abstract

The invention discloses a transformer digital non-electric quantity protection device and method based on deflection characteristics. A displacement sensor is used for measuring the deflection characteristic quantity of a transformer oil tank; whether the deflection characteristic quantity is larger than or equal to a deflection starting threshold value or not is judged, if yes, whether the deflection sudden change characteristic quantity is larger than or equal to a deflection sudden change threshold value or not is judged, and if yes, whether the deflection characteristic quantity is larger than a deflection protection judgment threshold value or not is judged. If the deflection protection judgment unit judges that the real-time deflection characteristic quantity is larger than or equal to the deflection protection judgment threshold value, a deflection tripping signal is sent out through the tripping unit. When a fault occurs in the transformer, a tripping signal is sent out, so that subsequent oil tank breakage and explosion accidents are avoided, and the operation safety of the transformer is improved. The device can reliably run for a long time, is not interfered by strong electromagnetic interference, and has the advantages of high response speed and high measurement frequency.

Description

technical field [0001] The invention belongs to the field of power systems, and relates to a transformer digital non-electrical protection device and method based on deflection characteristics. Background technique [0002] The safe operation of the power system is the basis for ensuring the safe and stable transportation of electric power, and it is also the guarantee for the safety of the power grid itself. As an important equipment of power system, transformer has been widely used with the rapid development of power system. With the development of UHV DC transmission projects, the operation of the power grid puts forward higher requirements on the reliability of power transmission and transformation equipment. As the core equipment for energy conversion and transmission, once a transformer fails, it will cause huge equipment loss, power loss, and economic loss, which has become a key and important factor affecting the safe operation of the power grid. Since 2017, fire a...

AI Technical Summary

Problems solved by technology

As the core equipment for energy conversion and transmission, once a transformer fails, it will cause huge equipment loss, power loss, and economic loss, which has become a key and important factor affecting the safe operation of the power grid.

Since 2017, fire and explosion accidents caused by internal faults of domestic transformers have occurred one after another, resulting in damage to some transformer equipment and major economic losses

The internal failure of the transformer caused the oil pressure in the tank to rise sharply, which in turn caused the deformation and rupture of the oil tank, eventually causing an explosion and fire accident

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