Remote monitoring of power transformers thermal image

This paper presents an original technical solution of device for distributive transformers' thermal image recording. The paper elaborates mathematical model of power transformer's thermal image, applied to estimate its hot-spot temperature. The block-scheme and brief technical description of realized device are presented here. The paper presents both hardware and firmware solution of the system. Developed prototype of such device has been tested during several months, in real conditions, in one substation 10/0.4 kV/kV in serbian capital, Belgrade. Permanent transmission of measured data have been obtained via GPRS. Technical solution of remote monitoring is described in the paper, too. (4 pages)