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Replacement of electromechanical protections in TNS Vraňany
Čechová, Karolína ; Šiler, Michal (referee) ; Orságová, Jaroslava (advisor)
The reconstruction of the traction substation Vraňany currently involves only the replacement of power oil transformers. The main reason for their replacement is the fact that the power transformers have already exceeded their designed lifecycle. According to an investor requirement, only the transformer replacement is considered, however, a new system of protection is not included. Even though the fault-free operation of power transformers is closely related to ensuring a reliable and safe electric power supply. The main aim of the thesis is to design a new system of protection for power transformers to replace the present one. In the theoretical part of the thesis is described the current state of the traction substation along with a calculation of short circuit current ratios and their comparison with the new ones considering the installation of the new power transformers. In the next part are inspected instrument current transformers if they comply with the requirements for the new protection system. The practical part of the thesis focuses on the selection of protection relay, calculation of the primary setting for selected protection functions, and subsequently conducting their functional tests. In conclusion, the economic part of the planned investment is estimated.
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Design of protection system using an sensor technology in MV substation
Strapko, Miroslav ; Prokop, Václav (referee) ; Topolánek, David (advisor)
Master's thesis deals with use of electronic instrument transformers (sensors) in the protection system in medium-voltage substation. Substation consists of 2 incoming feeders, 2 outgoing feeders for motors, 2 outgoing feeders for power transformers, measuring, bus coupler and bus riser feeder. Incoming feeders are connected to distribution system E.ON by cable lines which were proposed. Protected machines (power transformers and motors with rated power) are connected to switchgear panels of UniGear ZS1 type by cable lines too. Proposed protection system is based on the short-circuit conditions, standard CSN 33 3051 recommendations as well as theoretical backgrounds acquired from technical papers and other publicated literature according to the bibliography. For selected protection functions are defined their parameters. Control, monitoring and protection functions provides REF 542plus relay. Consequently, secondary tests which are part of the commissioning, are given in the practical part of thesis. Secondary tests were performed by relay test system FREJA 300 by Megger. Results of tests are displayed in tripping characteristics.
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Replacement of electromechanical protections in TNS Vraňany
Čechová, Karolína ; Šiler, Michal (referee) ; Orságová, Jaroslava (advisor)
The reconstruction of the traction substation Vraňany currently involves only the replacement of power oil transformers. The main reason for their replacement is the fact that the power transformers have already exceeded their designed lifecycle. According to an investor requirement, only the transformer replacement is considered, however, a new system of protection is not included. Even though the fault-free operation of power transformers is closely related to ensuring a reliable and safe electric power supply. The main aim of the thesis is to design a new system of protection for power transformers to replace the present one. In the theoretical part of the thesis is described the current state of the traction substation along with a calculation of short circuit current ratios and their comparison with the new ones considering the installation of the new power transformers. In the next part are inspected instrument current transformers if they comply with the requirements for the new protection system. The practical part of the thesis focuses on the selection of protection relay, calculation of the primary setting for selected protection functions, and subsequently conducting their functional tests. In conclusion, the economic part of the planned investment is estimated.
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Design of protection system using an sensor technology in MV substation
Strapko, Miroslav ; Prokop, Václav (referee) ; Topolánek, David (advisor)
Master's thesis deals with use of electronic instrument transformers (sensors) in the protection system in medium-voltage substation. Substation consists of 2 incoming feeders, 2 outgoing feeders for motors, 2 outgoing feeders for power transformers, measuring, bus coupler and bus riser feeder. Incoming feeders are connected to distribution system E.ON by cable lines which were proposed. Protected machines (power transformers and motors with rated power) are connected to switchgear panels of UniGear ZS1 type by cable lines too. Proposed protection system is based on the short-circuit conditions, standard CSN 33 3051 recommendations as well as theoretical backgrounds acquired from technical papers and other publicated literature according to the bibliography. For selected protection functions are defined their parameters. Control, monitoring and protection functions provides REF 542plus relay. Consequently, secondary tests which are part of the commissioning, are given in the practical part of thesis. Secondary tests were performed by relay test system FREJA 300 by Megger. Results of tests are displayed in tripping characteristics.
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