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Diplomsko delo zajema načrtovanje nove transformatorske postaje Zgornje Bitnje pri cerkvi in priključnega srednjenapetostnega kablovoda, ki se bo vključil v obstoječe distribucijsko omrežje. Predstavljene so osnovne komponente, ki jih vsebuje transformatorska postaja ter izračuni za izbiro ustreznih komponent. Prikazano je obstoječe stanje na lokaciji in predvideno novo stanje. The Diploma thesis includes the planning of new transformer stations Zgornje Bitnje pri cerkvi and a medium voltage cable line that will be connected to the existing distribution network. The basic components containing the transformer station and calculations for the selected corresponding component are presented. The existing situation at the location is shown and the new situation is anticipated.

Cilj diplomske naloge je bil izdelati projekt, v katerem je predvidena zamenjava celotne opreme v transformatorski postaji. Predstavljeni so problemi, s katerimi se projektant sreča med izdelavo projekta, kaj vse je treba upoštevati pri projektiranju, ter razlogi za menjavo transformatorja in opreme v transformatorski postaji. Transformatorska postaja je sestavljena iz treh glavnih komponent: iz nizkonapetostne razdelilne stikalne omare, srednjenapetostne razdelilne stikalne omare ter transformatorja. Ker je za učinkovito in zanesljivo distribucijo električne energije do porabnikov potrebna zanesljiva oprema v transformatorskih postajah, jo je treba v določenih časovnih okvirih zamenjati z novo. Življenjska doba distribucijskih transformatorjev je približno 40 let. Stikalne omare se običajno zamenjajo, ko te več ne zagotavljajo varnih in zanesljivih stikalnih manipulacij. V tej diplomski nalogi je predvidena zamenjava starega transformatorja z novim distribucijskim transformatorjem tipa 7HTlM, moči 400 kVA, proizvajalca Kolektor Etra. Za vgradnjo novega srednjenapetostnega stikalnega bloka je predviden Siemensov tipa 8DJH, polnjen s plinom SF6. Nizkonapetostni stikalni blok pa bo izdelalo podjetje IMP TEN in bo narejen po naročilu, v skladu z izračuni ter potrebami transformatorske postaje. V diplomski nalogi je opisan postopek menjave opreme v transformatorski postaji. Predstavljena je vsa oprema, predvidena za vgradnjo. Na podlagi izračunov, predstavljenih v zaključnem delu, so bile izbrane vse potrebne komponente, ki se bodo vgradile v transformatorsko postajo. The main goal of the diploma thesis was to create a project in which, the replacement of all equipment in the transformer station is planned. In the diploma are presented all the problems that a designer may encounter during the production of the project. It also presents what needs to be taken into account when designing and the reasons for replacing the transformer. The transformer station consists of three main components: a low-voltage distribution switch cabinet, a medium-voltage distribution cabinet and a transformer. Since we need reliable equipment in transformer stations for efficient and reliable distribution of electricity to customers, the equipment must be replaced with new equipment within certain time frames. The service life of a distribution transformer is about 40 years. Switch cabinets are usually replaced when they no longer provide safe and reliable switch manipulations. This diploma thesis plans the replacement of the old transformer with a new Kolektor Etra distribution transformer type 7HTIM with a power range of 400 kVA. For the installation of new medium-voltage switchgear, a Siemens switchgear type 8DJH filled with SF6 gas is planned. The low-voltage switchgear will be manufactured by IMP-TEN Company and will be made to order in according to the calculations and needs of the transformer station.

Diplomska naloga opisuje načrtovanje nove transformatortorske postaje za ventilacijsko postajo NOP II v podjetju Premogovnika Velenje d.d. Opisana je obstoječa postaj in izvedeni so izračuni kratkih stikov, dimenzioniranje aparatov in naprav ter izbira ustrezne opreme za novo transformatorsko postajo. Prikazana je lokacija nove transformatorske postaje ter opis predvidene opreme. The diploma thesis describes planning of a new transformer station for ventilation station NOP II in Premogovnik Velenje d.d. (Velenje Coal Mine). Current station is described, short circuit calculations, appliances’ and devices’ designs and the choice of suitable equipment for a new transformer station are made. The location of a new transformer station is also shown and the description of expected equipment.

V diplomskem delu je narejen načrt za transformatorsko postajo TP Kovis Livarna, ki je bila potrebna zaradi dograditve novega proizvodnega obrata. Za le to so narejeni izračuni kratkostičnih razmer na srednjenapetostnem in nizkonapetostnem nivoju in na podlagi tega tudi dimenzionirana vsa oprema tako na srednjenapetostnem kot na nizkonapetostnem nivoju. Skladno z določeno opremo in potrebnim prostorom za postavitev le te so definirane tudi vse gradbene zahteve za objekt nove transformatorske postaje, gledano iz stališča zanesljivega obratovanje elektro opreme. In this part, will be made a design for the transformer station TP Kovis Livarna, which is needed to complete the new production facility. For this purpose, short-circuit conditions will be calculated at medium voltage and low voltage levels and all equipment will be dimensioned on this basis. In accordance with certain equipment and the necessary space for installation, these will also define all construction requirements for the facility of a new transformer station, from the point of view of reliable operation of electrical equipment.

Elektro Primorska d.d. je zavezana k temu, da ima vsak odjemalec nemoteno ter kvalitetno dobavo električne energije. Nizkonapetostno omrežje Tratnik je dotrajano in zastarelo, ter še dodatno poškodovano zaradi posledic žledoloma, zato ne zagotavlja nemotene in kvalitetne dobave elektične energije. V času praktičnega izobraževanja sem v podjetju Elektro Primorska – distribucijska enota Tolmin, dobil nalogo za izdelavo elaborata za rekonstrukcijo nizkonapetostnega omrežja Tratnik. V nalogi je analizirano obstoječe stanje in predvidena rekonstrukcija nizkonapetostnega omrežja. V okviru analize so podani kontrolni izračuni za transformatorsko postajo, s poudarkom na izračunu kratkostičnih tokov na srednjenapetostni in nizkonapetostni strani transformatorja. Elektro Primorska, d.d., is committed to ensuring that every customer has an uninterrupted and quality supply of electricity. Low-voltage network Tratnik is deteriorated and outdated, and additionally damaged due to the consequences of sleet. Therefore it does not ensure an uninterrupted and quality supply of electricity. During the period of practical training, the company Elektro Primorska - distribution division Tolmin assigned me a task to elaborate the reconstruction of the low-voltage network Tratnik. The paper analyses the existing situation and the planned reconstruction of the low-voltage network. As part of the analysis, control calculations for the transformer station are given, with an emphasis on the calculation of short-circuit currents on the medium and low voltage side of the transformer.

V diplomski nalogi je predstavljena zamenjava transformatorske postaje v naselju Artiče. Zaradi povečane potrebe po energiji v naselju in dotrajanosti obstoječe transformatorske postaje, se postavi nova, močnejša transformatorska postaja. Prikazano je načrtovanje nove transformatorske postaje TP Artiče zadružni dom (nadomestna), z novim napajalnim srednjenapetostnim kablovodom. Izdelal sem enočrtno shemo TP Artiče zadružni dom (nadomestna), po kateri sem opravil vse potrebne izračune in rezultate za njeno brezhibno delovanje. This thesis explains and presents the replacement of the transformer station in the village of Artiče. Due to the increased demand for energy and the obsolete state of the current transformer station, a new and more powerful station is put in place. The thesis also shows the design and planning of the new transformer station TP Artiče zadružni dom (nadomestna) with the installation of a medium-voltage cable line. I prepared a scheme of the transformer station, according to which all necessary calculations were prepared in order to ensure its flawless operation.

V magistrski nalogi je predstavljen urejen sistematičen postopek načrtovanja industrijskega odjema električne energije. Obravnavani primer temelji na projektiranju industrijske transformatorske postaje, izvedene v slovenskem električnem omrežju. Prikaz postopka projektiranja tovrstnih projektov je namenjen izpostaviti problemov in iskanju učinkovitih rešitev tudi v podobnih projektih na področju električnih razdelilnih sistemov. Uvodna poglavja predstavijo problem ter splošni pogled na temo, ki bralcu na poljuden način predstavi obravnavano vsebino. Delo projektanta je tesno povezano z izdelovanjem projektne dokumentacije, zato je v prvih poglavjih opisan način izdelave projektov. Načrtovanje električnih postrojev temelji na dovršenih tehničnih rešitvah, vendar morajo biti te rešitve izbrane v skladu z veljavno tehnično zakonodajo. Zato je v nadaljevanju predstavljen obseg uporabe tehnične zakonodaje in standardov. Na področju industrijskega odjema električne energije se je v zadnjih desetih letih zgodil pomemben tehnični napredek, ki je opisan s skupino mednarodnih standardov IEC 61439, zato je ta standard nekoliko bolj obsežno predstavljen. Sledi praktični prikaz načrtovanja postroja električne opreme. Pristopi k izdelovanju projekta in načini načrtovanja opreme so predstavljeni v smiselnem zaporedju, ki vse od idejne zasnove omogočajo sistematično izdelavo načrtov za izvedbo del. Načrtovanje takšnih električnih sistemov v današnjih časih poteka pretežno v računalniškem okolju, zato je postopek izdelave predstavljen skozi način uporabe teh orodij. Bistvena področja dimenzioniranja, ki temeljijo na standardizacijskih postopkih, so predstavljena tudi v podrobni analitični obliki. Tehnične rešitve, problemi in dileme pri iskanju le teh so opisane v poglavju izdelave enopolne in tripolne sheme. This master thesis represent an effective way of planning electrical power distribution systems. The present case is based on a real project implemented in Slovenian power grid. The main aim of designing process of such projects is to highlight the problems and to find effective solutions in similar electrical distribution systems. The first chapters present the problem and the general overview of this master thesis. The work of the project engineer is fully associated with the preparation of project documentation which is represented in the first chapter. Design of electrical installations is based on sophisticated technical solutions which must be chosen in accordance to the applicable technical regulations. Therefore, it is presented below the scope of technical legislation and national standards. For the last ten years there has been a significant technical progress in the field of industrial power distribution systems. Low-voltage switchgear and control gear assemblies were completely renewed in a group of international standards IEC 61439 and that is why this standards are described more in detail. The second part of this thesis is continued by a practical demonstration of designing industrial transformer station. Approaches for choosing project planning methods and equipment are presented in a logical sequence, from concept ideas to the finally defined execution of works. Planning of such electrical distribution systems, nowadays, takes place mainly in the computer environment, so the designing process is presented through use of these tools. Essential fields for dimensioning electrical systems are based on standardization procedures and are also presented in the form of a detailed analysis. Technical solutions, problems and dilemmas are described in the section of manufacturing single-pole and three-pole electrical schemes.

V diplomskem delu je prikazano načrtovanje nove transformatorske postaje TP Orehovec z novim srednjenapetostnim napajalnim daljnovodom ali kablovodom. Transformatorska postaja na območju Orehovca je nujna, saj je oskrba z električno energijo tam slaba, ker se to območje trenutno napaja iz TP Vitna vas preko dotrajanega nizkonapetostnega nadzemnega voda. V uvodnih poglavjih je predstavljeno staro obstoječe stanje, v nadaljevanju pa predlogi novih omrežij in opreme. V jedru diplomskega dela so predstavljeni izračuni in rezultati, na podlagi katerih je izbrana oprema, katera je finančno ovrednotena. Diplomsko delo je zaključeno s sklepnim poglavjem, kjer so posebej opisani rezultati. The thesis shows the designing of a new transformer station TP Orehovec with a new medium-voltage power transmission line or cable conduit. The transformer station in the area of Orehovec is necessary because there is very poor power supply due to the fact that currently this area is powered by Vitna vas transformer station through dated low-voltage aerial line. Introductory chapters demonstrate the existing status, and are followed by proposals of new networks and equipment. The core of the thesis, demonstrates the calculations and results, based on which the equipment was selected and financially evaluated. The thesis is concluded with a final chapter containing the demonstration of results.

Diplomsko delo v prvem delu obsega splošen opis transformatorskih postaj, transformatorskih postaj znotraj industrijskega kompleksa Steklarne Rogaška, opis posebnega talilnega transformatorja Varivolt ter problematiko transformatorske postaje TP Brusilnica. V nadaljevanju so podani vsi potrebni izračuni, nujni za določitev ustrezne opreme ob rekonstrukciji transformatorske postaje TP Brusilnica, ki predstavlja jedro diplomskega dela. Predstavljena je primerjava izračunov, narejenih klasično z izračuni, izvedenimi s pomočjo programskih orodij Ecodial in xSpider. Na kratko sta predstavljena tudi oba programa. V sklepnem delu so na osnovi najbolj neugodnega scenarija predstavljene variante tehniških rešitev, posebej pa so opisane tri ustrezne rešitve treh različnih dobaviteljev opreme, in sicer Siemens, Schneider Electric in EATON. V zaključku je med temi tremi ustreznimi različicami podan predlog rešitve, ki je za uporabnika v konkretnem primeru najbolj sprejemljiv s tehniškega vidika in predstavlja minimalne stroške vzdrževanja v času življenjske dobe ter ne predstavlja okoljskega problema med obratovanjem in po izteku življenjskega cikla opreme. The first part of Thesis indicates a general description of transformer stations, transformer stations within the industrial plant Rogaska Glassworks, a description of the specific melting transformer Varivolt and the problem of transformer substation TP Brusilnica. Below are given all the necessary calculations which are needed to determine an appropriate equipment for reconstruction. It compares calculations made by classical method with those made by software tools Ecodial and xSpider. Both of mentioned calculation programs are presented in short. The final part is based on the most adverse scenario with technical solutions. Particularly describes three relevant solutions and three different equipment suppliers: Siemens, Schneider Electric and EATON. Among stated relevant versions of suggested solutions for the user in our case, the most acceptable was chosen, upon technical point of view with minimal maintenance costs during the life span and with minimal environmental problems during operation and after the expiry of the life cycle.

Tema diplomske naloge je bila priprava predloga za vpeljavo funkcij za analizo podatkov v programu MiSmart. Program MiSmart je namenjen zbiranju podatkov iz raznih merilnikov proizvajalca Iskra d.d., ki so nameščeni na merilnih mestih uporabnika. V diplomskem delu smo se osredotočili na njegovo uporabo v elektrodistribucijskih podjetjih, ki nameščajo merilnike električnih veličin v srednje/nizkonapetostne (SN/NN) transformatorske postaje (TP) za potrebe permanentnega monitoringa. V programu MiSmart se tako zbirajo meritve, alarmi ter podatki o kvaliteti električnega omrežja iz različnih merilnih mest. Omogočen je prikaz zbranih podatkov v grafični in tabelarični obliki, dodano uporabno vrednost uporabniku pa bi dala statistična obdelava teh podatkov. Funkcije za analizo, kot so histogram, percentil, deviacija parametra, simetrija, konična moč … dajejo uporabniku podrobnejšo sliko o delovanju omrežja ter pomoč pri analizi okvar, planiranju vzdrževanja, načrtovanju omrežja … Poleg tega podobna orodja vsebujejo tudi konkurenčni produkti. Cilj diplomske naloge je bil priprava dokumenta, ki je v pomoč razvojni ekipi podjetja Iskra d.d. in predstavlja osnovo za vpeljavo funkcij za analizo podatkov. Do njega smo prišli s pomočjo analize konkurenčnih produktov, lastnim poznavanjem problematike ter s prepoznavanjem težav in potreb končnih uporabnikov, ki so na koncu tudi potrdili uporabnost. The subject of thesis was preparation of proposal for integration of function for data analysis in MiSmart software. Software is intended for collecting the data from various measuring devices made by Iskra d.d., that are placed on users measuring points. Main focus is the use of software in electrodistribution utility companies, which are installing devices for monitoring electrical quantities in medium to low voltage (MV/LV) transformer stations for the purpose of permanent monitoring. In the software data about measurements, alarms and power quality from different measuring points are collected. Currently it is possible to view the data in tabular or graphical form added value would represent statistical analysis of those data. Functions such as histogram, percentile, parameter deviation, symmetry, peak power … offer the user better view on the operation of the electodistribution network. They serve as a great tool for analysis of faults, maintenance planning, development and planning of the network … Beside that, similar tools are integrated also in competitive software solutions. Main goal of the thesis was preparation of the document, that serves as a guidance for Iskra d.d. R&D team and represents the base for integration of functions for data analysis. During its preparation, we have analysed solutions that already exist on the market, used our knowledge and understanding of the problem and discovered the problems and needs through the discussions with the main users, which at the end also confirmed the usability of the product.

Diplomsko delo je nastalo v sodelovanju s podjetjem Štore STEEL. Za realizacijo projekta se bodo odločili v bližnji prihodnosti, saj želijo v svojem elektroenergetskem sistemu Štore STEEL odstraniti ali opustiti napetostni nivo 5 kV in uporabljati le sistem s 35 kV. Poleg tega bodo z rekonstrukcijo transformatorske postaje pridobili dodatno moč, ki jo bodo potrebovali v primeru širjenja oz. večanja proizvodnih kapacitet. Pri projektu Rekonstrukcija TP Jeklovlek smo imeli nalogo zamenjave enega ali več obstoječih transformatorjev 5/0,4 kV z novim močnejšim transformatorjem 35/0,4 kV moči 2,5 MVA. Pri tem smo morali izvesti vse potrebne izračune za kratke stike, udarne tokove, kratkostične moči, termične in dinamične obremenitve zbiralk itd., ki smo jih potrebovali, da smo lahko pravilno dimenzionirali pripadajočo VN in NN opremo. V programskem okolju AutoCAD smo dokumentirali trenutno stanje, stanje v času rekonstrukcije in novo stanje TP Jeklovlek, enopolno in tripolno NN shemo, VN shemo, za konec pa smo dokumentirali tudi priključitev transformatorja v stranskem risu. Dimenzionirati smo morali tudi oljno jamo in izvesti izračune za zadostno hlajenje transformatorja. The thesis was made in cooperation with Store STEEL. In the near future they will decide for realization of the project because they want to use 35 kV instead of 5 kV system. With reconstruction they will gain extra power to use, which they will need to increase production. In the project Reconstruction of TP Jeklovlek we had the task of replacing one or more of the existing transformers 5/0,4 kV with a new more powerful transformer 35/0,4 kV with power of 2,5 MVA. To do so, we had to make all the necessary calculations for short-circuits, short-circuit power, thermal and dynamic load of busbars, …, that we need for determining the correct high voltage and low voltage equipment. For drawing we used software called AutoCAD, which we used to draw the current state, state at the time of reconstruction and new state of TP Jeklovlek. I also drew poles schemes for low voltage, high voltage and at the end we drew the connections of the transformer in the side view. We also determined the size of oil pit and preformed calculations for sufficent cooling of transformer.

V diplomskem delu je predstavljen potek načrtovanja nove transformatorske postaje Runtole in 20 kV kablovoda, preko katerega se vključi v elektroenergetsko omrežje. Najprej je predstavljena dokumentacija, s katero se srečamo pri načrtovanju projekta. V nadaljevanju sledi opis transformatorske postaje in priključnega kablovoda. Prikazani so tehnični izračuni, ki jih potrebujemo pri dimenzioniranju 20 kV kablovoda, transformatorske postaje in nizkonapetostnih izvodov. This thesis presents the course of designing a new transformer station Runtole and 20 kV cable line, through which it is incorporated into the electricity network. In the introductory chapters is presented documentation, with which we meet in the planning of the project. Followed by a description of the transformer station and its connecting cable line. The main part of the thesis incloudes technical calculations, which are needed for dimensioning 20 kV cable line, transformer station and low voltage copies.

V diplomskem delu sem predstavil postopke dimenzioniranja in načrtovanja ozemljitvenih sistemov v distribucijskem omrežju. Obravnaval sem tako ozemljitve transformatorskih postaj, kot tudi ozemljitve daljnovoda. Rezultate, pridobljene z meritvami na realnih objektih, sem primerjal z rezultati iz teorije. Zanašal sem se na pravilnike in standarde, ki so trenutno normativni v Sloveniji. Predstavljeni so parametri varne ozemljitve, katere je potrebno upoštevati, če želimo, da bo naš ozemljitveni sistem pravilno in varno deloval. In diploma thesis I have presented dimensioning and planing processes of grounding systems in distribution network. I have dealt with transformer station grounding and transmission lines earthing. I compared the results obtained by measurements on real objects and compare them with the results from the theory. I relied on the policies and standards that are currently normative in Slovenia. There are presented parameters of safe grounding, which must be taken into account, if we want to make our earthing system properly and safe to operate.

V diplomskem delu je obravnavana rešitev za napajanje podjetja Deplast. Predstavljeno je trenutno stanje v podjetju, kraju in distribucijskem podjetju. Z upoštevanjem predvidenih nadaljnjih širitev podjetja je izdelan izračun kratkostičnih razmer ter dimenzioniranje opreme za novo 20/o,4-kilovoltno transformatorsko postajo Deplast. Izbrana je primerna oprema. Smisel naloge je opisati postopke, ki na spripeljejo od ideje do nove transformatorske postaje. The aim of this thesis is to find a suitable power supply for the company Deplast. It introduces the current energy situation at the company, the locality and the distribution centre. Considering the anticipated additional expansion of the company a calculation of the short-circuit situation has been made, as well as the dimensioning of the equipment for the new 20/0,4 kV transformer station Deplast. The suitable equipment has been chosen. The thesis intends to describe the necessary procedures to turn the initial idea into a transformer station.

V diplomski nalogi je ustvarjen načrt za izvedbo nove transformatorske postaje TP Konti, ki bo napajala novo napravo Konti za kontinuirano ulivanje jekla. Ob tem bo železarna Štore STEEL, d. o. o. izboljšala kvaliteto svojega polproizvoda (gredic) in povečala kapaciteto odlitega jekla. Za novo transformatorsko postajo TP Konti so izvedeni izračuni kratkih stikov, določene so stikalne naprave za VN in NN strani ter izračunane termične in dinamične obremenitve zbiralk. V programskem orodju AutoCAD so narisane enočrtne in tripolne sheme postrojenja, nadomestne sheme impedanc ter enočrtne sheme na visoko in nizkonapetostni strani omrežja. Prikazana je lokacija izgradnje nove transformatorske postaje in določena oprema v njej. Prav tako so izvedeni izračuni za hlajenje transformatorja in dimenzioniranje njemu pripadajoče oljne jame, prikazana je tudi postavitev transformatorja v prečnem preseku. In this thesis is presented a plan for the implementation of a new transformer station TP Konti, which will supply electrical energy to the new continuous caster equipment. With installation of new continuous caster steel plant STORE STEEL d.o.o. will increase the capacity of steel production and reach better quality of their semi product (billets). For new transformer station TP Konti calculations of short circuit currents have been carried out, HV and LV equipment for transformer station have been chosen, and we calculated thermal and dynamic load of busbar. The software tool AutoCAD had been used to draw single line diagrams, three-pole drawings and impedances of the supply network. On drawings it is also shown, where the new transformer station will be placed in existing building, and which HV and LV equipment will be installed. For transformer room, calculations of cooling the transformer at its nominal load are done and sizing the transformer oil pit which is shown on the drawing of the transformer room layout in the cross-sectional view.

V magistrskem delu je predstavljen postopek načrtovanja umestitve novega srednjenapetostnega (SN) 20 kV kablovoda in transformatorske postaje v prostor. V uvodnih poglavjih so povzeti osnovni zakoni, ki jih je treba upoštevati pri načrtovanju objekta. Predstavljeni so udeleženci, ki sodelujejo pri gradnji. V jedru magistrskega dela je opisana metoda, po kateri je bila določena in izbrana trasa predvidene gradnje SN 20 kV kablovoda. Narejeni so tehnični izračuni dimenzioniranja SN 20 kV kablovoda in ostale elektro opreme, vključno z NN kablovodom do NN zbiralk odjemalca. Na koncu sledi povzetek pridobljenih rezultatov. This master thesis presents the process of designing a medium voltage (MV) power line and the inclusion of a new transformer station in the distribution power network. In the introductory chapters the basic laws are summarised which must be taken into account when designing the facility. Furthermore, the participants, involved in construction, are presented. The main part of the thesis includes the presentation of the method which served as the means of determining or selecting the route of the planned construction of the MV 20 kV power line. This is followed by technical calculations of dimensioning MV 20 kV power line and other electrical equipment, including low voltage (LV) cable to the client. Finally, a brief summary of the obtained results is provided.

Diplomska naloga opisuje načrt za izvedbo nove transformatorske postaje, s pomočjo katere bi bilo podjetje KLS Ljubno d. d. ob širitvi proizvodnje oskrbovano z zadostno količino električne energije. Izvedeni so izračuni kratkih stikov, dimenzioniranje aparatov in naprav ter preverjanje zbiralk glede na termično in dinamično obremenitev. Prikazani sta lokacijska umestitev nove transformatorske postaje ter opis predvidene opreme. Izvedeni pa so tudi izračuni za hlajenje transformatorjev ter razsvetljavo v transformatorski postaji. This diploma work describes a plan for the implementation of a new transformer plant, that would supply the company KLS Ljubno d.d. with a sufficient amount of electric energy in case of enlargement of production. The calculations of short circuits, the dimensioning of equipment and devices, and the thermal and dynamic control of the busbar system have been carried out. The diploma work also shows the location of the new transformer plant, and a description of the equipment needed. Furthermore, the calculations for the cooling of transformers and the electric lighting within the transformer plant have also been performed.

Diplomska naloga obravnava problematiko izgub električne energije na oslabljenem prenapetostnem odvodniku na transformatorski postaji Kot-Makej (0,95/0,4 kV) in neozemljenem izvoru. Omenjena transformatorska postaja se napaja iz razdelilne transformatorske postaje Ravne (RTP RAVNE) preko 20 kV daljnovoda Mežica in transformatorske postaje Kot (20/0,95/0,4 kV). Rešitev je predstavljena s programskim orodjem MATLAB/Simulink iz knjižnice PowerSystem, s katerim je izvedena simulacija pri oslabljenem prenapetostnem odvodniku. V nalogi je podana rešitev primera. This diploma thesis deals with the losses of electrical energy casued by the aged surge arrester. The discucced surge arrester is connected to the transformer substation Kot – Makej (0, 95/0, 4 kV where, the neutral point of the transformer’s secondary winding is ungrounded. The substation is supplied from the distribution transformer station Ravne (RTP Ravne) through 20 kV transmission line Mežica and transformer station Kot (20/0, 95/0, 4 kV). The analysis of the losses caused by the aged sourge arrester is performed with the model prepared in the program package MATLAB / Simulink using library PowerSystem. The diploma thesis proposes measures for reduction of energy losses that could be caused by the aged surge arresters.

Magistrska naloga opisuje tehnični varianti elektroenergetskega napajanja novega naselja individualnih objektov v Tomačevem (Ljubljana). Opisani sta dve varianti, in sicer, varianta A: napajanje naselja individualnih objektov iz obstoječega nizkonapetostnega omrežja z izgradnjo še potrebnega nizkonapetostnega omrežja ter varianta B: napajanje predvidenega naselja iz obstoječega 10 kV srednjenapetostnega omrežja, v katerega se vključi nova transformatorska postaja 10/0,4 kV z nizkonapetostnim razvodom za predvideno naselje individualnih objektov. Pri ocenjevanju posamezne variante je bil upoštevan kriterij najustreznejše rešitve. Iz tehničnega vidika je bilo za kriterij izbrano dolgoročno saniranje slabih napetostnih razmer na predvidenem območju, upoštevan je bil predvideni odjem moči bodočih odjemalcev električne energije in ekonomski vidik. In the master thesis, two different technical variants of electricity supplay for the settlement of newly built detached houses in the district of Tomačevo (Ljubljana) are being described. In variant A, the power (electric) supplay of the settlement is being created by construction of the power appropriate low-voltage electrical network. In variant B, the power (electric) supplay of the settlement is being derived from already existing 10 kV middle-voltage electrical network, into which, the process of building a new transformer station 10/0,4 kV with the low-voltage cable distribution across the settlement, has been included. The criteria of the most appropriate solution is being considered in assessing the two technical variants. Criteria called long-term sanitation of bad voltage circumstances on the provided area, has been chosen out of technical aspects. The predicted consumption of electric energy of the future residents and the economical aspect of it, have been also taken in consideration.

Diplomska naloga obravnava specifiko elektroenergetske oskrbe večjih prireditvenih objektov zaprtega tipa. V nalogi je predstavljeno Slovensko narodno gledališče Maribor s sedanjimi elektroenergetskimi objekti. Podana in analizirana je trenutna poraba električne energije in način obremenitve. Opisane so posebne zahteve za tovrstne objekte. V zaključnem delu so podani predlogi za izboljšanje stanja, ki lahko služijo kot pripomoček pri izgradnji elektroenergetskega dela tovrstnih objektov. This diploma thesis deals with the power supply arrangement of larger buildings for cultural events. The situation of the Slovene National Theatre Maribor in the terms of its present power supply arrangement will be introduced. An analysis of the present consumption of electrical energy and the manner of strain has been made. Such buildings have special demands which are also described in the thesis. In the last part of this assignment propositions that could help improve the current condition are given. They could also be a guideline when establishing a power supply arrangement for buildings of this kind.

Diplomsko delo obravnava toplotno analizo kompaktne transformatorske postaje tipa KTPp630, ki služi za transformacijo iz srednjenapetostnega nivoja na nizkonapetostni nivo. Predstavljena je teorija prehajanja toplote na različne načine. V nadaljevanju so opisani posamezni deli transformatorske postaje in njihova vloga v transformatorski postaji. Sledi prikaz izračuna toplotnih izgub in toplotnih dobitkov transformatorske postaje ter analiza dobljenih rezultatov. This thesis in the main refers to the thermal analysis of transformer station type KTPp630, which is serving to transformation from middle voltage level to low voltage level. Theory of passing warmth is introduced on various ways. Individual parts of transformer station and their role in transformer station are described in continuation. Calculation of thermal losses, thermal gains of transformer station and analysis of acquired results are following.

V diplomski nalogi je predstavljen potek dimenzioniranja ter izbira opreme in aparatov nove transformatorske postaje TP Formalin 2 in vključitev le te v elektroenergetsko omrežje Nafte Lendava. Opisano je tudi elektroenergetsko omrežje Nafte Lendava in lastna industrijska elektrarna.V nalogi so izvedeni izračuni kratkih stikov na srednjenapetostni in nizkonapetostni strani, ki so bili nato uporabljeni za nadaljnje dimenzioniranje aparatov in naprav. Izvedena je tudi kontrola zbiralk ter odvodnih stikal The thesis represents the dimensioning course and the selection of the equipment and devices of the new transformer station TP Formalin 2 and it's inclusion into the electrical power network of Nafta Lendava. It also gives a short insight into the electrical power network of Nafta Lendava and it's own industrial power plant. In the thesis, the short circuit calculations on the middle- and low-voltage side are performed which were then used for further dimensioning of the equipment and devices. In addition

V diplomi smo opisali zajem meritev z analizatorji moči, ki so nameščeni v transformatorskih postajah (transformacija srednjenapetosti na nizkonapetost) distribucijskega omrežja Elektro Ljubljana, d.d., DE Ljubljana mesto. Po prečiščenju vseh podatkov in njihovi analizi smo preverili koliko se zajeti podatki razlikujejo v primerjavi z izmerjenimi podatki v razdelilni transformatorski postaji. Našteli smo nekaj primerov kjer bi te podatke lahko uporabili v Elektro Ljubljana, d.d., za konec pa je predstavljena ugotovitev o predimenzioniranju transformatorskih postaj na območju Elektro Ljubljana, d.d., DE Ljubljana mesto. The diploma thesis consists of the research and the analytical part. The basis of the task from the data acquired from measurements on the medium-low voltage distribution system of the Elektro Ljubljana d.d., DE Ljubljana city. After putting in order and analyze all captured data we examine how much they deviate from the date captured in the primary transformers stations. Than we count up some examples of practicability of captured date in some departments of Elektro Ljubljana d.d.. On the end we present ascertainment that the new distribution transformers stations of Elektro Ljubljana d.d. are over dimensioned.