Essays about: "protective relays"

Found 5 essays containing the words protective relays.

  1. 1. Relay settings for frequency derivative protection against islanding : Optimizing RoCoF-Hysteresis and Delay for the Swedish power grid: An investigation of relevant values

    University essay from KTH/Hälsoinformatik och logistik

    Author : Ahmad Safari; [2023]
    Keywords : Islanding; unintentional islanding; distributed energy resources; main grid; RoCoF; hysteresis; delay; Ödrift; oavsiktlig ödrift; distribuerade energiresurser; stamnät; RoCoF; hysteres; fördröjning;

    Abstract : This report addresses the parameter settings for a protective relay designed to safeguard a 15 kW wind turbine located in Rimbo, Norrtälje municipality, against unintentional islanding. This type of situation arises when distributed energy resources continue to supply local loads, even if the main grid has been unintentionally disconnected. READ MORE

  3. 2. Fault energy implications of distributed converter interfaced generation : A case study of an underground mine grid

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Tommy Hjertberg; [2021]
    Keywords : Dispersed PEID generators; short circuit energy; arc incident energy; protective relays; fault ride through; Distribuerad omformardriven generering; kortslutningsenergi; händelseenergi; reläskydd; felgenomkörning;

    Abstract : Adding Power Electronic Interfaced Devices (PEID) generation to grids is an increasing trend because of the concurrent development of better power electronic converters and a greater interest in a better utilisation of energy resources. Small and dispersed energy sources that would previously not be worth introducing into the grid is becoming more and more viable and other potential benefits such as better control of voltage levels and smoothing out load changes also spur this development. READ MORE

  4. 3. Översyn av skyddsanordning samt nollpunkt för fördelningsstationen Fs Myrängen

    University essay from KTH/Elektroteknisk teori och konstruktion

    Author : AMR Elawa; [2014]
    Keywords : ;

    Abstract : This is a report of a Master’s thesis done in behalf of the local network in Stockholm, under Fortum Distribution AB. The thesis was to conduct a review of a distribution station named Fs Myrängen located in Täby. A model was created for the 11 kV network linked to the secondary side of Fs Myrängen. READ MORE

  5. 4. Risk analysis of Geomagnetically Induced Current (GIC) in Power Systems

    University essay from Lunds universitet/Industriell elektroteknik och automation

    Author : Rasmus Thornberg; [2012]
    Keywords : Technology and Engineering;

    Abstract : Solar storms are a phenomenon that has a wide array of adverse consequences on technological systems, power systems in particular. During severe solar storms a geomagnetically induced current (GIC) starts to flow through long conducting structures, such as power lines and pipelines. READ MORE

  6. 5. Provning av reläskydd med intermittentfunktion

    University essay from Lunds universitet/Industriell elektroteknik och automation

    Author : Jakob Hägg; [2011]
    Keywords : Technology and Engineering;

    Abstract : The Division of Industrial Electrical Engineering and Automation, IEA, at LTH is participating in the research project DLAB, sponsored by E.ON. The goal of this project is to gain more understanding of the problems arising from increased cablification of Swedish medium voltage distribution grid and to develop an electric power laboratory. READ MORE