http___mg-servis.hr_projekti_hidrogeneratori_remontni-pregled__1.xml
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When does the need for an overhaul inspection arise? Routine inspection results, along with the generator operating hours, may demonstrate a need for an overhaul inspection. If the routine inspection results are good, then the need for an overhaul can be determined on the basis of the equivalent hours. teq = tpo + 20Ns (h) where: teq = equivalent operating time tpo = effective operating time Ns = number of starts Experience has shown that the first overhaul is performed after approx. 20 000 equivalent hours, and following after approx. 60 000 equivalent hours. Determining the status of components is partly based on a visual control, control of the dimensions, verticality and cable armor, electrical and mechanical tests. Basic overhaul inspection operations are determining of: - Stator housing status - Stator packet status - Stator winding status - Status of the stator windings water chambers - Winding supports status - Rotor caps status - Rotor pins status - Rotor current supply status - Status of the shaft, flange and sleeves - Hydrogen seals status - Other seals status - Bearings status - Ventilator status - Cooling device status - Slip rings status Based on these data and the routine inspections data, the generator status and the required interventions may be appraised. The overhaul implies the generator dismantling with decoupling of the rotor and its pulling out.
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Kada nastaje potreba za remontnim pregledom? Rezultati rutinskih pregleda uz sate i načine rada generatora mogu dati sliku potrebe za remontnim pregledom. Ako su rezultati rutinskih pregleda dobri onda se na osnovu ekvivalentnih sati može odrediti potreba za remontom. tek = tpo + 10Ns (h) gdje je tek = ekvivalentno vrijeme pogona tpo = efektivno vrijeme pogona Ns = broj startova Iskustvo je pokazalo da se prvi remont radi nakon cca 20 000 ekviv. sati, a sljedeći nakon cca 80 000 ekviv. sati. Utvrđivanje stanja dijelova zasniva se na osnovu vizuelne kontrole, kontrole dimenzija, kontrole vertikalnosti i opletanja, električkih i mehaničkih ispitivanja. Osnovne operacije remonta su utvrđivanje: - Stanje kućišta statora - Stanje paketa statora - Stanje namota statora - Stanje polova rotora - Stanje osovine i polnog kotača - Stanje nosača - Stanje ležajeva - Stanje ventilatora i kočnog prstena - Stanje kočnica - Stanje rashladnog uređaja - Stanje kl. koluta - Električna i mehanička ispitivanja Na osnovu ovih podataka i podataka sa rutinskog pregleda može se ocjeniti stanje generatora i potrebni zahvati. Remont podrazumijeva demontažu generatora sa raskuplavanjem i izvlačenjem rotora.