Power transformer low-frequency heating critical frequency calculation and automatic control method

The invention discloses a power transformer low-frequency heating critical frequency calculation and automatic control method. The method comprises the following steps of enabling a low-voltage side of a tested transformer to be short-circuited, and enabling a high-voltage side of the tested transformer to be connected with a low-frequency current; presetting a saturation critical frequency fg ofa transformer iron core; controlling the winding current of the tested transformer by adjusting an output voltage U1 of the low-frequency heating power supply so that the temperature of the transformer oil tank is controlled. The method is advantaged in that by adopting the method of presetting the saturation critical frequency fg of the transformer iron core, the saturation of the transformer iron core is effectively prevented, the service life of the iron core is prolonged, and a purpose of efficiently drying the transformer is achieved. 本发明公开了一种电力变压器低频加热临界频率计算及自动控制方法，所述自动控制方法包括以下步骤：被试变压器低压侧短路，被试变压器高压侧通入低频电流；预先设定变压器