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UVODINTRODUCTIONDragi Ëitatelji,u rukama Vam je novi broj Ëasopisa Energija koji,kao i do sada, donosi niz aktualnosti iz podruËjatræiπta elektriËne energije te pojedinih specijalistiËkihpodruËja u elektrotehnici. U svijetu, ali i uHrvatskoj, dominiraju teme vezane uz razvoj i izgradnjuenergetskih infrastrukturnih sustava, biloda se radi o plinskom ili elektroenergetskom sustavu.StruËna javnost osim o ovim vaænim aspektimaenergetskih i elektroenergetskih sustava razmatra ipitanja regulacije energetskih djelatnosti, odnosnoregulatorne politike koja treba omoguÊiti uspostavutræiπta umreæenih energenata; elektriËne energijei prirodnog plina.U ovom broju Ëasopisa Energija, objavljujemoËlanke koji su na neposredan ili posredan naËinvezani uz regulaciju energetskih djelatnosti, a istotako i Ëlanke iz pojedinih specijalistiËkih podruËjaelektrotehnike:∑∑∑∑∑Uloga regulatornog tijela u donoπenju tarifnihsustava ∑ okrugli stol ∑ prikaz i zakljuËciRegulatorna politika i njen utjecaj na planoverazvoja i izgradnje energetskih subjekata kojiobavljaju regulirane djelatnostiNumeriËki proraËun niskofrekvencijskih elektromagnetskihprijelaznih pojava u energetskimtransformatorimaDijagnostiËki pregled raspada elektroenergetskogsustava na otoku rodosuBaza podataka relejne zaπtite.U prvom Ëlanku su prikazani zakljuËci s Okruglogstola Hrvatskog ogranka CIGRE Studijskog odoraC5 ∑ Træiπte elektriËnom energijom i regulacija.Naime, reforma elektroenergetskog sektora podrazumIjevai reformu tarifnog sustava koja bi se trebalaprovesti poËetkom sljedeÊe godine i u ovomËlanku dani su vrlo zanimljivi komentari zainteresiranihstrana u hrvatskom elektroenergetskomsektoru, ali i relevantnih eksperata iz europskihregulatornih tijela i zemalja s viπegodiπnjim iskustvomu ekonomskoj regulaciji, bilo da se radi odugogodiπnjim Ëlanicama EU, ili zemljama koje sutek nedavno postale Ëlanice EU.Dear Readers,You are holding the most recent issue of the journalEnergija, which continues to present news aboutthe electricity markets and individual specializedfields in electrical engineering. In the internationalcommunity as well as Croatia, there is major interestin the development and construction of energyinfrastructure systems, both gas or electricity. Theprofessional public is also concerned with questionsregarding the regulation of energy activitiesand regulatory policies for the purpose of establishingmarkets for networked energy.In this issue of the journal, we are presenting articlesthat are directly or indirectly connectedwith the regulation of energy activities and articlesfrom individual specialized areas of electricalengineering:∑ The Role of the Regulatory Agency in the Adoptionof Tariff Systems: Round Table Discussion∑ Report and Conclusion∑ Regulatory Policy and Its Impact on the Developmentand Construction Plans of RegulatedEnergy Entities∑ The Numerical Calculation of Low FrequencyElectromagnetic Transient Phenomena in PowerTransformers∑ Diagnostic Review of a Blackout in Rhodes∑ Relay Protection DatabaseThe first article presents conclusions from theRound Table Discussion on the Role of theRegulatory Agency in the Adoption of Tariff Systemsorganized by the Croatian National Committee ofCIGRE ∑ C5 ∑ Electricity Markets and Regulation.Reform of the electricity sector also includes reformof the tariff system, which should be implementedearly next year. This article provides valuable commentariesby interested parties in the Croatianelectricity sector as well as relevant experts fromthe European regulatory bodies and countries withmany years of experience in economic regulation,long-time members of the EU as well as countriesthat have recently become members.524