Method for estimating probability of short circuit damage risk of large-sized transformer

Abstract

The invention discloses a method for estimating the probability of short circuit damage risk of a large-sized transformer. The method comprises the following steps: acquiring structure parameters of the transformer, checking the short circuit withstand capacity of the transformer, classifying a checking result and factors such as the operation environment and a low-voltage side configuration condition of the transformer, setting scores, endowing weights, quantifying the probability of the short circuit damage risk of the transformer according to information of a happened short circuit fault of the transformer, and performing grading. A worker can learn about the damage risk of the current transformer, and a technical support can be supplied to taking of targeted treatment measures in the future. The method is wide in application range, and can be applied to estimation of the probability of short circuit damage to various transformers with different voltage levels and different capacities. The method is high in reliability and low in cost; a common computer can be used for performing real-time computing, so that participation of a worker is reduced, the working error is reduced, and the working efficiency is improved.

Description

technical field [0001] The invention relates to a method for evaluating the risk probability of short-circuit damage of a large-scale transformer, which is a novel method suitable for analyzing the state of transformer short-circuit damage, and belongs to the field of transformer operation detection and maintenance. Background technique [0002] The transformer is the core of the power supply system, and the reliability of its operation has a great impact on the safety of the power system. However, with the increasing capacity of the current power grid, the short-circuit capacity of the system also increases. At the same time, the operating environment of the incoming and outgoing lines of the substation is not optimistic, and various overvoltages occur from time to time. In recent years, due to various reasons, accidents of damage to large-scale transformers caused by external short-circuits have occurred frequently. Many transformers have winding deformation and damage whe...

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Problems solved by technology

[0022] At present, various network provincial companies have calculated the short-circuit withstand capacity of transformers in operation, some using the algorithm recommended by the Japanese Transformer Committee, and some using the finite element method for calculation, etc. Through these algorithms, the operating unit can intuitively grasp the short-circuit withstand capacity of the transformer. Some have statistically analyzed the quality and fault conditions of the low-voltage side of the transformer in operation, so as to understand the probability of tripping at the low-voltage side of the transformer, and then intuitively analyze the possibility of short-circuit damage to the low-voltage winding of the transformer. The short-circuit withstand capacity of the transformer is combined with the operating environment of the transformer and the historical working conditions, and then the method of evaluating the probability of transformer damage when the transformer is short-circuited

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