On-line Monitoring Method of Transformer Winding Deformation Based on Circuit Impedance Method

Abstract

The invention discloses an online transformer winding deformation monitoring method based on a circuit impedance method and relates to a method used for monitoring transformer winding deformation conditions online. The method comprises steps that a circuit impedance value of a primary winding and a circuit impedance value of a secondary winding of a transformer in online operation are calculated by a micro processor according to an acquired first voltage, an acquired first current, an acquired second voltage and an acquired second current, and a mathematics model for calculating circuit impedance; the circuit impedance value of the primary winding acquired through calculation is compared by a worker with a circuit impedance value of a standard primary winding, the circuit impedance value of the secondary winding acquired through calculation is compared by the worker with a circuit impedance value of a standard secondary winding, and the transformer winding deformation conditions can be determined online in real time. The method is advantaged in that a circuit impedance method is employed for measurement, the principle is simple, and the method is convenient to realize.

Description

technical field [0001] The invention relates to a method for on-line monitoring deformation of transformer windings, in particular to an on-line monitoring method for transformer winding deformation based on circuit impedance method. Background technique [0002] The power transformer is one of the important electrical equipment in the power system, and it undertakes the important responsibility of voltage conversion, power distribution and transfer in the power system. Power transformers are expensive and complex in structure, and their health is a prerequisite for the safe operation of the entire power grid. Once an accident occurs during the operation of a large-scale power transformer, it may cause a power outage, which will have a huge impact on the lives of residents and factory production. At the same time, the maintenance time of the transformer is generally more than half a year, and the cost is huge. Therefore, it is necessary to try our best to ensure the safe ope...

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Problems solved by technology

[0004] The parameters of the transformer equivalent circuit can be measured by circuit test and no-load test, but this type of method requires offline testing, the transformer must be disconnected from the grid, and abnormal signals during the operation of the transformer cannot be monitored.

Therefore, this type of off-line detection method cannot reflect the operating status of the transformer winding in real time.

[0005] In the on-line monitoring of transformer winding deformation, the most common method is the frequency response method. However, due to factors such as different models and different wiring methods that have a certain impact on the frequency response curve of the transformer, most of them rely on the experience of the testing personnel to make judgments. Reliable basis for judging winding deformation

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