A Calculation Method for Hot Spot Temperature of Separate Cooling Transformer in Underground Substation

Abstract

The invention discloses a method for calculating the hot spot temperature of a split-type cooling transformer in an underground substation. By obtaining the equipment parameters of the split-type cooling system transformer, performing a no-load test and a load test of the split-type transformer, and measuring the no-load loss and load loss of the transformer respectively ;Rated load temperature rise test was carried out to obtain the rated top oil temperature rise and winding temperature rise; based on the thermoelectric equivalent principle, a split transformer thermal circuit model was established and optimized to obtain the transformer top oil temperature thermal circuit model and hot spot temperature model ; The fourth-order Runge-Kutta method is used to solve the thermal circuit differential equation, and the top oil temperature time series and hot spot temperature time series are calculated under the given load curve and ambient temperature curve. The invention is beneficial to more fully utilize the dynamic load capacity of the split type cooling transformer, and promote the in-depth application of transformer online monitoring information.

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 the hot spot temperature of traditional integrated cooling transformer windings, but there is no relevant research on the temperature calculation of split transformers at home and abroad.

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