Abstract
Traveling surges are commonly adopted in protection devices of high-voltage direct current (HVDC) transmission systems. Lightning strikes also can produce large-amplitude traveling surges which lead to the malfunction of relays. To ensure the reliable operation of protection devices, recognition of traveling surges must be considered. Wavelet entropy, which can reveal time-frequency distribution features, is a potential tool for traveling surge recognition. In this paper, the effectiveness of wavelet entropy in characterizing traveling surges is demonstrated by comparing its representations of different kinds of surges and discussing its stability with the effects of propagation distance and fault resistance. A wavelet entropy-based recognition method is proposed and tested by simulated traveling surges. The results show wavelet entropy can discriminate fault traveling surges with a good recognition rate.
Highlights
Traveling surges or traveling waves on power transmission lines are often used for protection or location purposes, especially in high-voltage direct current (HVDC) systems [1]
Once a fault occurs in a HVDC system, the fault current increases quickly
Protection devices based on traveling surges are commonly applied in HVDC
Summary
Traveling surges or traveling waves on power transmission lines are often used for protection or location purposes, especially in HVDC (high-voltage direct current) systems [1]. The traveling surges propagate along the transmission lines with the speed of light. The protection device communication with traveling surges is faster than those with optic fiber, and is regarded as the fastest communication path in power transmission. Protection devices based on traveling surges are commonly applied in HVDC systems. In DC systems, where no zero-crossing point exists, traveling surges are always detectable at line terminals. No matter what kind of fault and what the ground impedance is, a surge will be produced and rush towards the terminals of transmission lines. Compared with impedance-based fault identification methods, the traveling surge-based method is more reliable and a better choice in HVDC systems. The high frequency components of the traveling surge will attenuate during propagation due to the skin effect losses, for example, and the rise time increases, and the amplitude decreases, it is still possible to pick them up with high sampling rates and advanced signal processing tools
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
