IEC 61850-Based Centralized Protection against Single Line-To-Ground Faults in Ungrounded Distribution Systems

Abstract

We developed an International Electrotechnical Commission (IEC) 61850-based centralized protection scheme to prevent single line-to-ground (SLG) faults in the feeders and busbars of ungrounded distribution systems. Each feeder intelligent electronic device (IED) measures its zero-sequence current and voltage signals and periodically transmits zero-sequence phasors to a central IED via a Generic Oriented Object Substation Event message. Using the zero-sequence phasors, the central IED detects SLG faults in feeders and busbars. To achieve centralized protection, angle differences between the zero-sequence currents and voltage phasors are exploited, and their calculation compensates for data desynchronization. The feeder IEDs were implemented using the MMS-EASE Lite library, while the transmitted zero-sequence phasors were calculated based on fault signals simulated by Power System Computer Aided Design / Electro-Magnetic Transient Design and Control (PSCAD/EMTDC). The central IED determined if the SLG fault was in a feeder or busbar by aggregating and analyzing the zero-sequence phasors received from the feeder IEDs. The results confirmed the validity and efficiency of our centralized protection scheme.

Optimization of IEDs Position in MV Smart Grids through Integer Linear Programming

“…In particular, the proposed IED-OLP formulation minimizes the AV20 index, i.e., a parameter establishing the economic penalty suffered by the energy supplier, as a result of the inefficiency caused to costumers due to a fault in the network. The proposed approach has been tested using a real radial network, constituted of 41 nodes, considering different customer distributions and varying the number of IEDs to be installed within the range (2)(3)(4)(5)(6)(7)(8).…”

“…At the present, it is possible to equip the MV network with Intelligent Electronic Devices (IEDs), i.e., microprocessor-based devices capable of (i) receiving analog signal from sensors, (ii) controlling electrical equipment such as circuit breakers, capacitor bank switches, voltage regulators, (iii) exchanging messages with other IEDs or with Supervisory Control And Data Acquisition (SCADA) systems [4] according to a communication standard defined by IEC 61850 [5]. The use of IEDs allows the implementation of extremely fast and efficient methods for locating and isolating the fault [6].…”

Optimization and Performance Assessment of a Logic Selectivity Solution Based on LoRa Communication

“…According to this approach, the network is equipped with intelligent protection devices capable of locating and isolating a fault simply by exchanging messages with one another [1][2][3]. This method, compared with the traditional approaches of localization of the faults, guarantees three advantages: (1) the fault is localized in a time that is independent from its position; (2) the number of consumers supplied by the network experiencing a short interruption (less than one minute) during the fault localization is minimized [4,5]; (3) the section of the network that remains powered off to isolate the fault is minimized [6]. In order to make these benefits real and not damage the network as a result of the failure, the rate at which the devices communicate must be adequate [7,8].…”