Error analysis of transformer winding thermometer

For transformer winding thermometer error analysis: with the constant improvement of transformer running safety requirements, winding thermometer as a operation monitoring device is becoming more and more widely used. Generally in the thermometer, the inside of the thermometer is proportional to the increase of the temperature of the electric heating element is the difference between the winding and tank top temperature increase, in fact this is not correct. For different structures of transformer winding thermometer, but you can use the electric heating element inside flow of electric current and load current is proportional to the system group, but because of the electric heating element and winding cooling condition is not the same, this will make the same current change does not necessarily cause the same in the winding and the electric heating element temperature change, that is, in some cases, the temperature of the thermometer can also be a gap, according to the actual application situation were analyzed. Working principle of winding thermometer: winding thermometer is the use of thermal simulation principle of indirect measurement system of hot point temperature group, the main components are: temperature, measurement bellows and capillary, reflect the transformer top oil temperature measurement system, current transformer, current matcher and electric heating element.