Calculation method for radiating and ventilating air speed of main transformer chamber of transformer substation

Abstract

The invention discloses a calculation method for radiating and ventilating air speed of a main transformer chamber of a transformer substation. Namely, the heating value of the main transformer chamber is evaluated according to the heat converted by reactive loss of the main transformer in the main transformer chamber, the heating value of a full-insulating copper pipe bus under the operating current, the heat transferred to the main transformer chamber by the air temperature and sunlight outside the main transformer chamber, and the heating value from illuminating lamps in the main transformer chamber; then the ventilation quantity in the main transformer chamber is calculated; and the radiating and ventilating air speed of the main transformer chamber of the transformer substation is calculated according to the evaluated effective ventilating area. The calculation method has the technical effects that the shortcoming of underestimation on the heating value of the main transformer chamber of the transformer substation by the conventional calculation method is effectively overcome; and the ventilation quantity required by radiating is reasonably improved when the transformer substation is designed so as to ensure that the temperature in the main transformer chamber is within a reasonable range in order to effectively ensure the normal operation of the main transformer and other equipment in the main transformer chamber of the transformer substation.

Description

technical field [0001] The invention relates to a calculation method for heat dissipation and ventilation wind speed in a substation main transformer room in the field of power transmission and distribution. Background technique [0002] With the development of our country's national economy and the continuous expansion of cities, some uninhabited substations in the suburbs and surrounding areas have gradually evolved into urban substations with new residential buildings around them, so new technical measures for the heat dissipation of the original substations have been proposed. Require. The placement of the main transformer in the urban substation in the main transformer room often results in poor ventilation and poor heat dissipation, resulting in an increase in the temperature of the main transformer room and affecting the stable operation of the equipment. However, the forced cooling of the main transformer chamber will reduce the temperature in the main transformer c...

AI Technical Summary

Problems solved by technology

The main transformer of the urban substation is placed in the main transformer room, often resulting in poor ventilation and poor heat dissipation, resulting in an increase in the temperature of the main transformer room and affecting the stable operation of the equipment

However, the forced cooling of the main transformer room will reduce the temperature in the main transformer room, which will easily cause noise pollution.

[0003] The reasons for the above problems are as follows: First, the ventilation volume of the main transformer room is low during ventilation and heat dissipation. This is because the main sources of heat in the main transformer room include the following four items: heat transformed by reactive power loss of the main transformer; full insulation The calorific value of the copper tube busbar under the working current; the heat transfer to the main transformer room under the combined effect of outdoor air temperature and sunshine; the calorific value of the lighting fixtures in the main transformer room

Among the above four calorific values, the first calorific value is the largest. Therefore, the previous ventilation and heat dissipation systems only focused on this calorific value and ignored the latter three indoor heat sources. As a result, the calorific value calculated in the main transformer room was relatively small, so the design ventilation rate also decrease accordingly

However, in the actual operation of the main transformer room, the heat of the above four items may exist to varying degrees, making the temperature in the main transformer room inevitably higher than the expected temperature, affecting the safe operation of the equipment

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