Essays about: "protection relay"

Showing result 1 - 5 of 15 essays containing the words protection relay.

  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. Microgrid Protection Strategies for the Swedish Power System

    University essay from Lunds universitet/Institutionen för energivetenskaper

    Author : Zalak Shah; [2023]
    Keywords : Microgrid; Protection; three-phase fault; earth fault; Technology and Engineering;

    Abstract : This thesis mainly focuses on the protection strategies of microgrids for the Swedish power system in the medium voltage distribution system and specifically on the three-phase fault and earth faults protection strategies. For the analysis of both faults, different grid-connected, and islanding operations are simulated using DIgSILENT Power Factory. READ MORE

  4. 3. En kvalitativ studie av jakt på råbock under våren

    University essay from SLU/Dept. of Urban and Rural Development

    Author : Christine Aminoff; [2020]
    Keywords : rådjur; naturresurshantering; förvaltning; etik; traditioner; samverkan; konflikt;

    Abstract : För 30 år sedan infördes vårbockjakt som idag innefattar länen Västmanland, Uppsala, Gävleborg, Västernorrland och Västerbotten. Anledningen bakom be-slutet är kärnkraftsolyckan som skedde i Tjernobyl 1986 och innebar att radioaktivt nedfall föll över Sverige och att organismer som exempelvis svampar och lavar sög åt sig nedfallet. READ MORE

  5. 4. Automatic post-fault analysis based on disturbance data stored in substation devices : Approach towards the preventive maintenance

    University essay from KTH/Hälsoinformatik och logistik

    Author : Riad Yalda; Miroslav Urosevic; [2019]
    Keywords : COMTRADE file; preventive maintenance; relay protection; automatic post-fault analysis; IEC 61850; wavelet transform.; COMTRADE filer; förebyggande underhåll; reläskydd; automatisk efterfelsanalys; IEC 61850; wavelettransform.;

    Abstract : This report studies the possibilities of minimizing unplanned maintenance work and improving the availability of power supply by enabling preventive maintenance in power systems, without having to make additional investments in the existing systems. This was done using information from COMTRADE files (disturbance recording files) that are created in the event of a fault in the power system. READ MORE

  6. 5. A novel approach to detect CT saturation using standalone CT measurements

    University essay from KTH/Elkraftteknik

    Author : Salman Uddin; [2017]
    Keywords : CT; CT saturation; Power system protection; Strömtransformator; Strömtransformatormattning; Reläskydd i kraftsystem;

    Abstract : The requirement for reliability and security in power system is increasing every passingday with the increase in complexity of the power system. To ensure highest level ofreliability, protection relays have to receive correct measurements. One of the most importantmeasurement that is needed by a relay as an input is current. READ MORE