Study on a New Transformer Main Protection Scheme
In the paper a new transformer main protection scheme based on the combination of generalized fundamental power and difference of loop equation is proposed.The transformer loop equations are studied, the relationship between the differential voltage and differential current is deduced and the concept of generalized fundamental power is proposed.The protection based on the generalized fundamental power reflects the changes of amplitudes and phase angles of the differential voltages and currents under different operation condition, and it is needless to discriminate inrush current.Because it is needless to calculate the leakage impedance of transformer windings accurately the proposed scheme is easy to be realized.The experiment results show that the proposed scheme has sufficient reliability and sensitivity and is superior to the differential current protection with second harmonic restraint.
transformer generalized fundamental power difference of loop equation inrush current internal fault
Xue Wang Zengping Wang
School of Electrical and Electronic Engineering,North China Electric Power University,Baoding,China
国际会议
成都
英文
392-395
2011-09-27（万方平台首次上网日期，不代表论文的发表时间）