Traveling Wave Fault Location Reliability Improving

For single-end or double-end traveling wave (TW) fault location it is required to identify the TW front that arrived the first to the installation place of the locator from a short circuit (SC) along the protected power line (used TW front). If the protected power line has a parallel short power line, the TWs fronts along them from the SC reach the measurement place earlier than the used TW front. This dramatically complicates the identification of the used TW front and can lead to significant error in fault location. Traditional methods of identifying the used TW front have low reliability due to the impossibility of accurately measuring the voltage TWs fronts using capacitive and inductive voltage transformers. In this article methods of identifying the used TW front are proposed. Proposed methods only use current TWs measured with high accuracy from electromagnetic current transformers. The proposed methods are developed to improving the reliability of the TW fault location.