Method for calculating hotspot temperatures of split type cooling transformers in underground substations

Abstract

The invention discloses a method for calculating hotspot temperatures of split type cooling transformers in underground substations. The method comprises the following steps of: obtaining equipment parameters of a split type cooling system transformer; carrying out a no-load test and a load test on the split type transformer and respectively carrying out measurements to obtain no-load loss and load loss of the transformer; carrying out a rated load temperature rise test to obtain rated top-layer oil temperature rise and winding temperature rise; establishing a split type transformer thermal circuit model on the basis of a thermoelectric equivalence theory, and optimizing the split type transformer thermal circuit model to obtain a transformer top-layer oil temperature thermal circuit model and a hotspot temperature model; and solving a thermal circuit differential equation by adoption of a four-order Ronge-Kutta method, and calculating a top-layer oil temperature time series and a hotspot temperature time series under a given load curve and a given environment temperature curve. According to the method disclosed by the invention, dynamic load capacity of the split type cooling transformers can be utilized more sufficiently to promote the good application of the transformers to online information monitoring.

Description

technical field [0001] The invention relates to a method for calculating the hot spot temperature of an underground substation split-type cooling transformer. Background technique [0002] With the rapid increase of urban electricity load, the number of substations in urban areas has increased. Considering the land occupation area and urban environment coordination, the proportion of underground substations and indoor substations in urban substations is increasing. Underground substations due to space constraints In order to meet the heat dissipation requirements of power equipment, the cooling system of the transformer often needs to be designed separately from the transformer body. With the continuous increase of electricity load, the problem of transformer heat dissipation is becoming more and more prominent. In order to ensure the heat dissipation effect, the form and layout of the underground transformer cooler are quite different from those of conventional substations...

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Problems solved by technology

[0003] Therefore, it is of great significance to accurately and reliably calculate the hot spot temperature of split transformers. At present, there are many calculation methods for th

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