Assessing method for overload capacity of transformer

Abstract

The invention provides an assessing method for an overload capacity of a transformer. A first model which is used for treating and acquiring a hot spot temperature of the transformer is formed in advance and a second mode which is used for treating and acquiring forecast overload time of the transformer is formed in advance. The assessing method comprises the following steps: acquiring the hot spot temperature of the transformer according to the treatment of the first model; acquiring the forecast overload time of the transformer according to the treatment of the second model; acquiring the forecast life loss of the transformer by treating according to the hot spot temperature and the forecast overload time; assessing the overload capacity of the transformer according to the forecast life loss; simultaneously executing the step S1 and step S2. The invention has the beneficial effects: various factors which influence the overload running of the transformer are collected, a thermal circuit model is established, the BP neural network training is adopted, the hot spot temperature of the transformer at present is calculated and the safety time of the overload running of the transformer is calculated, so that the life loss of the transformer can be forecast, the calculation result is more accurate and the calculation method is more reliable and has higher practical application value.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a transformer overload capacity evaluation method. Background technique [0002] With the growth of the national economy, my country's electricity load is increasing day by day, and the transformer will inevitably appear overloaded in actual operation. When the transformer load current increases, the transformer loss will increase accordingly, which will increase the temperature rise of the insulating material of the transformer, lead to accelerated deterioration of the insulating medium, and reduce the service life of the transformer. Therefore, it is of great significance to evaluate the overload capacity of the transformer. [0003] The oil-immersed power transformer is one of the core equipment in the power system, and its stable operation has a very important impact on the safety and reliability of the system and the control of operating costs. During the operation of...

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Problems solved by technology

[0005] At present, the evaluation of transformer overload capacity at home and abroad is mainly based on the improved temperature thermal circuit model, which mainly collects several characteristic quantities such as load current, winding temperature, and top oil temperature for evaluation. The factors affecting the overload capacity of transformers considered are not comprehensive enough. In this way, the overload capacity of the transformer cannot be well evaluated, and sometimes irreparable mistakes will occur, which will affect the power consumption of the society.

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