Method for drying transformer

Abstract

The invention discloses a method for drying a transformer, comprising: the high voltage side of the transformer is in short circuit, and the low voltage side is applied with lower voltage, so that the current of a winding is 120-125% of rated current, and the rated current is used until the temperature of the high voltage winding reaches 65 DEG C; when the temperature of the high voltage winding reaches 75 DEG C, 85% of rated current is used for heating; when the temperature of the high voltage winding is lower than or equal to 90 DEG C, the temperature of oil surface is less than or equal to 85 DEG C; and the operation is carried out until the insulating property of the winding is qualified. The method is used for solving the problem of resorting over-low insulation of the transformer by copper loss drying, and changes the phenomenon that a drying stove is used for heating the winding of the transformer and improving the insulation degree of the transformer in the prior art; furthermore, the process is simple, and the operation is easy no matter the winding of the transformer is heated by DC or AC.

Description

technical field [0001] The invention belongs to the technical field of power equipment maintenance methods, in particular to a drying method for transformers. Background technique [0002] For transformers, oil leakage, low winding insulation, and oil quality deterioration are common due to long-term use. The existence of this problem will bring great equipment safety hazards. If the winding insulation is too low, it is easy to cause damage to the transformer winding and reduce the operating level of the equipment, endangering safety and other issues, which is not conducive to the safe work situation of more supply and less loss. The three major factors that lead to low winding insulation are (1) moisture immersion, high humidity and high humidity in the place, which can be heated and dried, (2) insulation aging; through actual investigation, it is found that some old transformers that have been in disrepair for a long time, the most This phenomenon is prone to occur, which...

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Problems solved by technology

(3) The oil level is too low, the maintenance is not timely, etc. before the transformer is put into operation, such as the loss of the insulation properties of the oil, it is an individual phenomenon that the moisture is immersed and the insulation is damp or the transformer, the insulation resistance of the transformer is too low, and the transformer is seriously damp. During the maintenance of transformers, it is time-consuming and labor-intensive to use the kiln to dry the transformer. It needs to be disassembled, started the kiln, heated, tested, and reinstalled, causing undue economic losses and troubles to users, and reducing the power supply of the grid.