An adaptive PMU based fault detection/location technique for transmission lines - Part II: PMU implementation and performance evaluation

Part I of this paper set sets forth theory and algorithms for adaptive faul t detection/location technique,which is based on Phasor Measurement Unit (P MU). This paper is Part II of this paper set. A new timing device named "Gl obal Synchronism Clock Generator, GSCG'' including its hardware and softwar e design is described in this paper, Experimental results show that the syn chronized error of rising edge between the two GSCGs clock is well within 1 ps when the clock frequency is below 2.499 MHz. The measurement results be tween Chung-Jeng and Chang-Te 161 kV substations of Taiwan Power company by PMU equipped with GSCG is presented and the accuracy for estimating parame ters of line is verified. The new developed DFT based method (termed as Sma rt Discrete Fourier Transform, SDFT) and line parameter estimation algorith m are combined with PR-IU configuration to form the adaptive fault detector /locator system. Simulation results hare shown that SDFT method can extract exact phasors in the presence of frequency deviation and harmonics. The pa rameter estimation algorithm can also trace exact parameters very well, The SDFT method and parameter estimation algorithm can achieve accuracies of u p to 99.999% and 99.99%, respectively, The EMTP is used to simulate a 345 k V transmission line of Taipower System. Results have shown that the propose d technique yields correct results independent of fault types and is insens itive to the variation of source impedance, fault impedance, and line loadi ng. The accuracy of fault location estimation achieved can be up to 99.9% f or many simulated cases, The proposed technique will be very suitable for i mplementation in an integrated digital protection and control system for tr ansmission substations.