State assessment method and assessment system after transformer short circuit

Abstract

The invention discloses a state evaluation method after a transformer is short-circuited, which includes: S1. Obtaining fault parameters when the transformer is short-circuit faulted, and calculating the fault score value of the transformer according to the fault parameters; State parameters after the fault, and calculate the state score value of the transformer according to the state parameters; S3. Calculate the comprehensive score value of the transformer according to the fault score value and the state score value, and determine the state of the transformer according to the preset comprehensive evaluation standard. The state evaluation system corresponding to the method includes the evaluated transformer, the state parameter test module, the historical state parameter database, the fault parameter database, and the evaluation module; the evaluated transformer is connected to the state parameter test module, the state parameter test module, and the historical state parameter database and the fault parameter database are respectively connected with the evaluation module. The invention has the advantages of high evaluation efficiency, accurate evaluation results and high reliability.

Description

technical field [0001] The invention relates to a transformer evaluation method and evaluation system, in particular to a transformer short-circuit state evaluation method and evaluation system. Background technique [0002] The transformer is one of the core equipment of the power grid, and its stable and reliable operation will be of great significance to the power system. Due to the limitations of the design and manufacturing process level and operation and maintenance level, or system failure, transformer damage occurs from time to time. Statistics show that with the rapid development of the power grid, the short-circuit capacity of the power system has increased, and the large current impact of short-circuit faults in the vicinity is the main cause of transformer damage in recent years. Under the action of electromotive force and mechanical force under high current in short-circuit in the near area, the transformer winding will be deformed, and partial discharge may be...

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Problems solved by technology

The current evaluation mode usually evaluates a single state parameter, analyzes and judges the fault through fault recording and protection information, and then derives a large number of tests of the corresponding transformer from the PMS system (equipment (asset) operation and maintenance lean management system) Data analysis and comparison, the above processes are all done manually, the process is complicated, so

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