Title :
Temperature dependence of return voltage characteristics [of power current transformers]
Author :
Kozlovskis, A. ; Rozenkrons, J.
Author_Institution :
Dept. of Power Supply, Riga Tech. Univ., Latvia
Abstract :
Recently, return voltage measurements have been proposed for the diagnosis of HV power equipment, characterising the dielectric properties of their insulation systems. The application of the return voltage method for the diagnosis of HV current transformer insulation is presented in this paper. The return voltage characteristics such as maximum of return voltage, the initial slope of return voltage and the time to peak value dependencies on charging time are discussed. These characteristics vary depending on the ageing changes of the insulation, indicating the possible applicability of the technique for assessing the state of transformer insulation. The investigations of temperature influence on the return voltage characteristics aim to determine the state of the insulation under various operating conditions. The theoretical analysis of the results allows to calculate the temperature of insulation that corresponds to the thermal breakdown
Keywords :
current transformers; electric breakdown; insulation testing; power transformer insulation; power transformer testing; thermal analysis; voltage measurement; dielectric properties; insulation state assessment; operating conditions; power current transformers; return voltage characteristics; temperature dependence; thermal breakdown; transformer insulation diagnosis; Aging; Breakdown voltage; Current measurement; Current transformers; Dielectrics; Oil insulation; Power transformer insulation; Reliability theory; Temperature dependence; Voltage measurement;
Conference_Titel :
Power System Technology, 1998. Proceedings. POWERCON '98. 1998 International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-4754-4
DOI :
10.1109/ICPST.1998.728939
