Dijagnostika protueksplozijskih zaštićenih elektromotornih pogona

scientific master's theses

• Author: Ivica Gavranić
• Mentor: Drago Ban (mentor)
• Committee member: Ivan Ilić (predsjednik povjerenstva)
• Committee member: Drago Ban (član povjerenstva)
• Committee member: Nenad Marinović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Electric Machines, Drives and Automation); Zagreb
• Defense date and country: 2002-10-01, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering; Electromechanical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

U magistarskom radu su opisane metode tehničke dijagnostike kaveznih asinkronih elektromotora primjenjive na protueksplozijski zaštićene elektromotorne pogone. Analiziran je utjecaj parametara ugroženog prostora na primjenu dijagnostičkih metoda, te posebni zahtjevi kod ispitivanja u uvjetima ugroženosti eksplozijom. U laboratorijskim su uvjetima provedena ispitivanja elemenata protueksplozijske zaštite na elektromotorima u vrsti zaštite oklapanje - ”d”, povećana sigurnost - ”e” i nadtlak - ”p”. Ispitivanja i analize rezultata su obavljeni u skladu s normama iz područja protueksplozijske zaštite, važećim u Republici Hrvatskoj. Definirane su potrebne radnje za otklanjanje utvrđenih nedostataka. Razmotren je utjecaj pretvarača frekvencije, preko kojih se napajaju suvremeni protueksplozijski zaštićeni elektromotorni pogoni, na parametre motora značajne sa stanovišta protueksplozijske zaštite. U pogonskim su uvjetima, primjenom metode analize spektra linijske struje namota statora, provedena ispitivanja stanja kaveza i dinamičke ekscentričnosti na motorima snage 1.9 MW i 500 kW u vrsti protueksplozijske zaštite povećana sigurnost - ”e”. Temeljem dobivenih rezultata je ocjenjeno stanje kaveza rotora i dinamičke ekscentričnosti, te su definirane potrebne servisne aktivnosti i daljnja periodička ispitivanja.

Abstract (english)

In this M.S. thesis, methods of technical diagnostics of squirrel-cage induction motors that are applicable to explosion-proof electric motor drives are described. The influence of hazardous area parameters on application of diagnostic methods is analysed, and also an analysis is given of special requirements for tests in the conditions of explosion hazard. Elements of explosion protection of electric motors designed in types of protection Flameproof enclosures - ”d”, Increased safety - ”e” and Pressurized - ”p” were tested in laboratory conditions. The tests and analyses were made in accordance with standards that are valid for explosion protection in the Republic of Croatia. The actions necessary to eliminate the detected defects are specified. The influence of frequency converters for feeding modern explosion-protected electric motor drives on parameters of the motor that are relevant in terms of explosion protection is considered. The condition of the squirrel cage and the dynamic eccentricity were tested on 1,9 MW and 500 kW motors with explosion protection type Increased safety - ”e”. The tests were made in operating conditions, applying the spectral analysis method to stator winding line current. The obtained results were used for assessment of the condition of rotor squirrel cage and the dynamic eccentricity, and also to define the necessary servicing activities and further periodic tests.

• Keywords: Protueksplozijska zaštita elektromotora; kvarovi asinkronih elektromotora; dijagnostička ispitivanja; spektralna analiza struje
• Keywords (english): Explosion protected electric motors; faults of squirrel-cage induction motors; technical diagnostics; spectral analysis of current
• Language: croatian
• URN:NBN: urn:nbn:hr:168:017400
• Study programme: Title: Postgraduate master programme in electrical engineering; Study programme type: university; Study level: postgraduate; Academic / professional title: Magistar znanosti elektrotehnike (Magistar znanosti elektrotehnike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-04-30 08:30:23