Abstract
This paper proposes a one-terminal traveling wave (TW)-based transmission line earth fault distance protection function. It only needs the detection of the first incident modal earth fault-induced TWs, so that, the challenging detection of wavefronts reflected from the fault point is not required. Both the sampling frequency effect and inaccuracies on the wave propagation velocity are considered in order to define the distance protection zone. Simulated fault records were played back in an actual relay, allowing the comparison between a commercially existing time-domain distance protection element and the proposed one. The proposed function is more accurate and significantly reduces transmission line distance protection tripping times without dependability losses.
Highlights
T RAVELING-WAVE-BASED transmission line protection can be divided into one- and two-terminal techniques
These results demonstrate that the usage of the proposed traveling wave (TW)-based earth fault distance protection in order to speed up the protection operation is efficient and reliable
This paper proposes a traveling wave-based earth fault transmission line distance protection, which only requires arrival instants of the first incident modal traveling waves at one line terminal and the estimation of modal propagation velocities with uncertainties
Summary
T RAVELING-WAVE-BASED transmission line protection can be divided into one- and two-terminal techniques. FRANÇA et al.: TRAVELING WAVE-BASED TRANSMISSION LINE EARTH FAULT DISTANCE PROTECTION method demands multimeasuring points and communication systems. In order to develop an ultra-high-speed protection function and overcome the problems mentioned so far, this paper proposes a one-terminal TW-based transmission line earth fault distance protection function, termed as TW21G. It requires the detection of the first α- and zero-mode (0-mode) wavefronts only, eliminating the need for identifying reflections from the fault, which is traditionally a challenging task for one-terminal approaches. The protection logic using the proposed TW21G function achieved both the best success rate for internal fault detection and ultra-fast operation times smaller than 2 ms on a line with 210 km length, speeding up the distance time-domain element TD21 in all detected earth faults
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