Ⅰ. Introduction
The winding temperature indicator is a special-purpose instrument using the simulated
temperature measurement technique to measure the temperature of the hottest portion of the
transformer winding，which is obtained as the summation of T0 and △T , or T=T0+△T,where,T0 is
the oil temperature in upper part of the transformer, which can be easily measured; and △T is the
temperature rise caused by the rise of the transformer loading current.
The main functions of the winding temperature indicator model BWR(WTYK)—04 are the
signal alarming, cooling control and accident tripping etc. With its excellent performance of
protection and disturbance rejection, and high reliability, this instrument works well in the outdoor
condition. It can also transfer the winding temperature signal to the control center, display
simultaneously on the computer system and monitor the working conduction of the transformer.
