Directional element for faulty feeder identification of high‐resistance fault in high‐surety power supply systems

Abstract

The high‐surety power supply systems are gaining great attention to enhance the reliability of uninterruptable power supplies. A high‐resistance fault along a high‐surety power supply feeder results in a low fault current, making the conventional high‐surety power supply protection strategy ineffective. To address this problem, this paper develops a directional fault protection strategy for high‐resistance fault detection and faulty feeder identification. Using the intelligent electronic device, the feeder current is sampled and normalised. Then, the fault‐imposed component of the current signal is calculated. This component is added to the input of the forced Helmholtz oscillator to increase the sensitivity of the proposed protection scheme for the detection of high‐resistance faults. The output of the forced Helmholtz oscillator equation is adopted as the fault detection criterion because it is infinity for reverse faults while it is lower than 1 for forward faults, facilitating the fault detection. The developed strategy is local and can detect and classify both pole‐to‐ground and pole‐to‐pole high‐resistance faults. Also, it is effective for both unidirectional and bidirectional converters. The merits of the proposed protection strategy are demonstrated through several fault scenarios using a ±375 V high‐surety power supply system.

Towards Automating the Integration of Legacy IEDs into Edge-Supported Internet of Smart Grid Things

“…InternetofThings(IoT) and Cloud Computing head the list of mature ICTss to pave the way for the next generation of SGs BarjaMartinez et al (2021). In the former, IoTbased Smart Grid Systems (Internet of Smart Grid Things (IoSGT)) harness a set of Intelligent Electronic Devices (IEDs) that are equipped with transmission proto cols to deliver measurement data to the operations center of the power operator Rouhani et al (2020).…”