Zaščita hidroelektrarne Sindila v Ugandi

TREBŠE, VID (author), Čepin, Marko (mentor)

V današnjem življenju postaja potreba po kakovostni dobavi električne energije vedno bolj izrazita. Zaradi okvar, ki se pojavljajo v elektroenergetskem sistemu, je zelo pomembno, da elemente elektroenergetskega sistema dobro zaščitimo. V primeru slabe zaščite lahko nastanejo veliki stroški. Namen diplomske naloge je prikazati pomembnost zaščite v elektroenergetskem sistemu s poudarkom na njeni pomembnosti pri elektrarnah. Zato se najprej dotaknemo tematik, ki nam prikažejo okvare na različnih elementih elektroenergetskega sistema in vrst zaščit, ki take okvare izolirajo od drugega dela elektroenergetskega sistema in s tem preprečijo poškodbe elementov v sistemu. Po splošnem pregledu okvar in zaščit sledi prikaz zaščite hidroelektrarne Sindila v Ugandi. Opisani so releji, ki so uporabljeni v hidroelektrarni in nastavitve parametrov zaščit. Vsaka zaščita potrebuje tudi različne parametre za svoje pravilno delovanje. Te parametre specificiramo v releju, ki nato sam skrbi za zaščito. Na koncu je v programskem okolju Simulink modelirana in prikazana diferenčna zaščita transformatorja, ki smo jo izvedli z lastnim modelom. Predstavlja prvo glavno zaščito hidroelektrarne. Simulacija je narejena iz idealnih merilnikov napetosti in tokov, kjer zanemarimo pogreške. Prav tako so uporabljeni idealni odklopniki, brez reakcijskega časa in kabelske povezave brez impedance. So pa v simulaciji upoštevani parametri iz hidroelektrarne Sindila, tako osnovni parametri kot tudi zaščitni parametri. Pri tem je prikazano delovanje zaščite brez časovnega zamika in s časovnim zamikom. Iz simulacij je razvidno, da se ob okvarah pojavijo precej veliki tokovi, ki povzročajo segrevanje in izgube, zato je zelo pomembno, da zaščita izklopi elektrarno čim hitreje, oziroma v vnaprej določenem časovnem zamiku. Z zamikom želimo preprečiti morebitne prehitre izklope hidroelektrarne v primerih, ko se pojavijo vklopi bremen ali pri stikalnih manevrih.

• Language: Slovenian
• Keywords: okvara, diferenčna zaščita, elektrarna, kratkostični tok
• Work type: Bachelor thesis/paper
• Organization: FE - Faculty of Electrical Engineering
• Year: 2018
• PID: 20.500.12556/RUL-103752
• Publication date in RUL: 24.09.2018

Secondary language

• Language: English
• Title: Protection of the hydro power plant Sindila in Uganda

Abstract

The need for a quality supply of electrical energy is becoming increasingly pronounced in today's life. It is very important that the elements of the power system are well protected against the defects occurring in the electrical power system. Large costs may occur in the case of a poor protection. The purpose of this thesis is to show the importance of protection in the electric power system, with an emphasis on its importance in power plants. Therefore, we first describe the topics that show us defects on various elements of the power system and the types of protection that isolate such defects from the other part of the electric power system, thus preventing damage to the elements in the system. After general overview of defects and protection, demonstration of the protection of hydro power plant Sindila in Uganda is shown. Relays and protection parameters of the hydro power plant are described. Each protection also needs different parameters for its proper functioning. These parameters are specified in the relay, which then protects elements. Finally, in the Simulink software environment, the differential protection of the transformer is shown, which we carried out with our own model. This protection is modeled through a simplified protection model of the hydro power plant Sindila and represents the first major protection of the hydro power plant. The simulation is made from ideal voltage and current meters where we ignore the errors. Ideal circuit breakers are also used, with no reaction time and cable connection without impedance. However, basic parameters and protection parameters from the hydro power plant Sindila are taken into account in the simulation. The model shows the operation of the protection without time delay and with time delay. From the simulations it can be seen that in the event of damages, there are rather large currents that cause heating and losses, therefore it is very important that the protection switches off the protected eqipment as soon as possible, or at a predetermined time lag. With the delay, we want to prevent possible early shut downs of hydro power plant in cases when load loads occur or in switching maneuvers.

• Keywords: fault, differential protection, power plant, short circuit current