Surge Compression for Improved Fault Location Accuracy in Full Transient-Based Methods

Abstract

This paper proves that the accuracy of singleended fault location techniques based on the correlation of fault transients in power lines can be significantly improved by inversefiltering transients first. The reason for this improved accuracy is found in the reduction of the duration of the fault surge signal, thus increasing the sensitivity of fault-location metrics to the fault position. Reported results show that by using the proposed filtering strategy, faster sampling rates systematically and significantly improve the location accuracy, as opposed to the case when no filter is applied, for which virtually no improvement is observed. Because of its higher spatial selectivity, the proposed fault-location technique required the development of a new synchronization method, which ensures a precise transient synchronization without the need for high-speed sampling. It is concluded that by jointly using the proposed transient filtering and synchronization solutions, correlation-based fault location can be significantly improved even when using sampling rates as low as 100 kHz. Extensive numerical simulations for a threephase transmission line confirm an improvement exceeding one order of magnitude in the fault location accuracy, for both lowand high-impedance faults.

A review of time reversal-based methods applied to fault location in power networks

“…This metric takes into account that the signal energy might notably reduce when the back-injected transients propagate through line junctions (this issue was also observed by Razzaghi et al in their first publications). In 2021, Cozza et al (2021b) proposed an inverse filtering surge compression method, which was shown to be capable of using a relatively low sampling rate (can be as low as 100 ksps) to estimate the transfer functions from fault transient signals. Besides, He et al (2020b) discussed the spatial resolution of the correlation metric, which was defined using the theory of Fabry-Pérot interferometers as the minimum shift from the true fault location to an adjacent guessed fault location induced by the minimum variation between their corresponding resonance frequencies.…”

Binary Tree Algorithm-based Fault Location Method for Tripping in Ultra-high Voltage Substations

“…Since then, some scholars have begun to study multiple information fusion methods, such as analyzing the corresponding relationship between specific communication links and secondary devices based on network partitioning and extracting some key messages to identify the operation of relay protection secondary circuits [4] . This method adds message information from other secondary devices based on fault secondary device self-inspection information, thereby improving the accuracy of secondary device fault location.…”

A novel power-combination method using a time-reversal pulse-compression technique

“…The time-reversal (TR) method refers to when the response signal of a system is turned into a reversal signal and then input into the system, and the original waveform is reconstructed at the initial position. [1,2] TR has the characteristics of spatiotemporal focusing, which can be used in various fields such as pulse compression, [3][4][5] secret communication, [6,7] reversal imaging, [8,9] beam forming, [10][11][12][13] positioning, [14,15] perturbation detection, [16,17] etc. The first electromagnetic reversal system consisted of a single transmitting and receiving antenna and a reverberation chamber with a high Q value.…”