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Srednji energetski transformatoriMedium Power Transformers

2,5-100 MVAdo/up to 170 kV

Osnovni tehnički podaciKONČAR-D&ST proizvodi niz trofaznih uljnih transformatora snaga od 2,5 do 100 MVA za najviši napon opreme do 170 kV. Regulacija napona je na VN strani, a vrši se prespajanjem odvojaka pomoću preklopke u beznaponskom stanju ili regulacijske sklopke pod opterećenjem. Ovi transformatori predviđeni su za vanjsku montažu u različitim klimatskim uvjetima. Izrađeni su i ispitani u skladu s normom IEC 60076, a mogu se opteretiti snagom većom od nazivne prema normi IEC 60076-7.

JezgraJezgra je izrađena od hladnovaljanog, orijentiranog magnetskog lima niskih specifičnih gubitaka. Limovi su obostrano izolirani tankim slojem anorganske izolacije, postojane na transformatorsko ulje i visoke temperature.

NamotiNamoti su projektirani tako da zadovolje zahtjeve na mehaničku otpornost prema silama kratkog spoja, dopuštenom zagrijanju i ispitnim naponima. Cilindričnog su oblika, izrađeni od vodiča velike vodljivosti izoliranih lakom ili papirom. Ovisno o struji i naponu koriste se različiti tipovi namota – preloženi, spiralni, slojni, upleteni.

IzolacijaOsnovni materijali izolacije su ploče od prešpana prerađene u odgovarajuće oblike te transformatorsko ulje. Izolacija između namota i prema uzemljenim dijelovima sastoji se od ulja i barijera od prešpana u obliku cilindara i kapa. Korišteno mineralno ulje u skladu je s normom IEC 60296. Na specijalni zahtjev transformatori mogu biti punjeni i sintetičkim esterom (npr. MIDEL 7131).

Otpornost na kratki spojTransformatori su tako dimenzionirani i izvedeni da izdrže sile kratkog spoja, što se dokazuje ispitivanjem prema normi IEC 60076-5 ili odgovarajućim proračunima.

BukaIntenzitet buke mjeri se prema normi IEC 60076-10. Na zahtjev izrađujemo transformatore sa sniženom razinom buke.

KotaoIzrađen je od čeličnih limova i može izdržati određeni pretlak i vakuum bez trajnih deformacija.

Zaštita od korozijeZbog različitih teških okolnih uvjeta u kojima naši transformatori rade, poduzima se niz zahvata da se osigura odgovarajuća zaštita od korozije. Gotovi kotlovi, poklopci i ostali metalni dijelovi pripremaju se i štite u skladu sa ISO 12944 standardom ovisno o kategoriji korozije C1 do C5M.

Basic technical dataKONCAR-D&ST manufactures a range of three-phase oil-immersed transformers of powers up to 100 MVA, for the highest system voltage up to 170 kV. Voltage regulation is carried out by reconnecting the tappings by means of an off-circuit tap changer at no voltage condition or by an on-load tap changer under load. Transformers are intended for outdoor operation under various climatic conditions. They are manufactured and tested in accordance with the standard IEC 60076. All the transformers can be loaded over the rated power acc. to IEC 60076-7.

CoreCore is made of cold rolled grain oriented magnetic steel sheets of low specific losses. Sheets are mutually insulated by a thin layer of inorganic insulation, resistant to transformer oil and high temperatures.

WindingsWindings are constructed to meet the requirements with regard to the mechanical resistance to short-circuit forces, permissible temperature rise and test voltages. They are cylindrical in shape, made of conductors of a high conductivity, insulated by paper or enamel. Depending on the current and voltage, various winding types such as disc continuously wound, spiral, layer and interleaved type, are used.

InsulationBasic insulation material are the pressboards mould into necessary shapes and transformer oil. Insulation between the windings and to earthing parts consists of oil and pressboard barriers shaped like cylinders and caps. Applied mineral oil is in accordance with the standard IEC 60296. Transformers filled with synthetic esters (e.g. MIDEL 7131) are available on special request.

Ability to withstand short-circuitTransformers are designed and manufactured in such a way to withstand short-circuit forces, which is proved by testing acc. to standard IEC 60076-5 or relevant calculations, respectively.

NoiseNoise level is measured acc. to standard IEC 60076-10. Transformers with reduced noise level are available on request.

TankTank is made of steel sheets and is capable of withstanding a certain overpressure and vacuum without permanent deformations.

Corrosive protectionSince our transformers operate under different hard environmental conditions, series of actions are taken, in order to ensure proper corrosive protection.Finished tanks, covers and other metal parts are prepared and painted following ISO 12944 standard according to climate conditions C1 up to C5M.

Proizvodni program Srednji energetski transformatori, nazivnih snaga 2,5 – 100 MVA i napona do 170 kV, s preklopkom ili regulacijskom sklopkom

Uljni distributivni transformatori, nazivnih snaga do 2500 kVA i napona do 36 kV Suhi transformatori, nazivnih snaga do 5000 kVA i napona do 24 kV Specijani transformatori:

- Transformatori za uzemljenje - Ispravljački transformatori - Transformatori za lokomotive - Transformatori za metalurške peći - Transformatori i transformatorske stanice za rudnike

Prigušnice za metalurška postrojenja, ispravljačke uređaje te ograničenja struja kratkog i dozemnog spoja

Servisiranje i popravak svih vrsta transformatora i prigušnica

Production program Medium power transformers, rated powers 2,5-100 MVA and voltages up to 170 kV with off-circuit tap changer or on-load tap changer

Oil-immersed distribution transformers, rated powers up to 2500 kVA and voltages up to 36 kV Dry-type transformers, rated powers up to 5000 kVA and voltages up to 24 kV Special transformers:

- Earthing transformers - Rectifier transformers - Transformers for electrical traction - Transformers for metallurgical furnaces - Transformers and transformer substations for mines

Reactors for metallurgical plants, rectifying devices, short-circuit and ground fault current limitations Servicing and repairing all kinds of transformers and reactors

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PC Srednji energetski transformatoriTel: (+385 1) 378 3732Fax: (+385 1) 379 4050 E-mail: sales.set@koncar-dst.hr

KONČARdistributivni i specijalni transformatori d.d.

Mokrovićeva 8P.O.Box 10010090 ZagrebCroatia

www.koncar-dst.hr