Title :
An investigation of the temperature distribution in cast-resin transformer windings
Author :
Pierce, Linden W.
Author_Institution :
General Electric Co., Rome, GA, USA
Abstract :
A comprehensive thermal test program was conducted on a 2000 kVA cast-resin dry type transformer with 300 embedded thermocouples to determine the hottest spot temperature allowance and to obtain data to develop mathematical models. Nineteen thermal test runs were performed at different loads, tap positions, and core excitations under natural and forced air operating conditions. The test data indicated that the hottest spot temperature allowance used in the IEC standard was too low. In the IEEE standard the hottest spot temperature allowance appears conservative up to about 115°C average winding temperature rise. The locations of the hottest spot for the primary and secondary winding were determined. Conclusions about thermal testing and loading are presented
Keywords :
power transformers; standards; temperature distribution; temperature measurement; transformer windings; 2000 kVA; IEC standard; IEEE standard; cast-resin transformer windings; core excitations; forced air operating conditions; hottest spot temperature; mathematical models; primary windings; secondary winding; tap positions; temperature distribution; thermal test program; thermocouples; winding temperature rise; Europe; Heat transfer; IEC standards; Power transformer insulation; Solids; Standards development; Temperature distribution; Testing; Thermal loading; Windings;
Conference_Titel :
Transmission and Distribution Conference, 1991., Proceedings of the 1991 IEEE Power Engineering Society
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-0219-2
DOI :
10.1109/TDC.1991.169566
