Introduction of main transformer oil level thermometer

The oil level thermometer of the transformer is to indicate the change of transformer oil temperature. It consists of elastic element, capillary tube, temperature package and micro switch. When inserted into the transformer oil temperature package is heated, temperature package temperature-sensitive medium thermal expansion of the volume increment, through the capillary tube to the elastic element, so that the elastic element to produce a displacement, this displacement by the agency amplified by the temperature of the oil temperature of the upper layer of the transformer to be measured after the indication.

The main transformer winding thermometer is a special monitoring and control instrument that applies thermal simulation measurement technology to measure the temperature of the hottest point of the power transformer winding. The so-called thermal simulation measurement technology, is easy to measure the transformer oil temperature on the basis of the upper layer, and then impose a transformer load current changes with the additional temperature rise, the sum of the two, you can simulate the temperature of the transformer winding.

It is wired according to the winding heat depends on the winding current, and the transformer current transformer secondary side current is proportional to the winding current, so the winding temperature controller working principle is through the current transformer to take out the current that is proportional to the load, adjusted by the converter, and then input it into the electric heating element in the elastic element of the winding temperature controller, the heat generated by the electric heating element will make the elastic element produce an additional displacement, which produces The heat generated by the electric heating element causes an additional displacement of the elastic element, thus generating an indication value approximating the temperature of the winding. Therefore, when the transformer is loaded, the displacement of the elastic element is determined by both the transformer oil and the transformer load current.