Aerospace Technic and Technology

Description of the destruction (emergency) of a retaining ring of a pre-series Turbogenerator of medium power is submitted in the scientific work. The following destructions were detected: rupture of the back part of the rotor retaining ring as per the generatrix, complete destruction of the external ring of the fan, blades, diffuser, tearing-off of the rotor coils, cutting of the rotor winding and its fastening parts, severe damage of the whole overhang part of the stator winding, complete destruction of the top row of the stator winding bars in the overhang part, rupture of the elementary conductors. The causes of destruction (emergency) are submitted: availability of cracks on the external surface of the rotor ring of Turbogenerator, nonconformity to the specifications on the plastic properties of the retaining rings metal, admission of the defects at manufacturing of the Turbogenerator rotor retaining ring at the manufacturer-plant (rough treatment of the retaining ring surface, availability of nicks and scratches, eight-fold heating of the retaining ring, fire in the generator). The design peculiarities of the rotor retaining ring of Turbogenerators. The causality analysis of the retaining ring damage was carried out. It is shown that the cause of the emergency can be a chain of events not related to each other and individually each leading to a failure or emergency. It is found that the events, the probability of which lies on the edges of the power-series distribution, the so-called "heavy tail" distributions shall become the most probable if they can cause maximum loss due to damage. One approach is considered in an attempt to answer the question: whether there are objective regularities in describing the consequences of major emergencies and catastrophes in the technosphere and in nature. Since the probability of a defect in the part shall be inherent for all stages of the service life cycle of the design (design working out and studying, technological preparation, manufacturing of the part, testing for compliance with the technical parameters, assembly, testing of the general design), then for the most unfavorable event with "heavy tails" the decisive factor shall be the human factor, to predict the change and behavior of which is almost impossible. The sequence of execution of technological operations for the elimination of rejection is established.

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Bhargava, S. C. Finite Element Analyses of Eddy Current Effects in Turbogenerators [Finite Element Analyses of Eddy Current Effects in Turbo-generators]. CRC Press, 2017. 635 p.

Baker, T. E. Electrical Calculations and Guide-lines for Generating Station and Industrial Plants [Electrical Calculations and Guidelines for Gener-ating Station and Industrial Plants]. CRC Press, 2018. 304 p.

Filizadeh, Sh. Electric Machines and Drives: Principles, Control, Modeling, and Simulation [Electric Machines and Drives: Principles, Control, Modeling, and Simulation]. CRC Press, 2017. 237 p.

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STO 70238424.29.160.20.002-2009 Turbogeneratory serii TV. Gruppovye tehnicheskie uslovija na kapital'nyj remont. Normy i trebovanij [STO 70238424.29.160.20.002-2009. Turbogenerators series TV. Group technical conditions for major repairs. Standards and requirements]. Moscow, NP IEPI Publ., 2009. 11 р.

Kozlov, I. L. Sovershenstvovanie teoreticheskikh i metodologicheskikh osnov analiza bezopasnosti AES pri maloveroyatnykh avariinykh sobytiyakh s katastroficheskimi posledstviyami. Dys. ... dok. tekhn. nauk [Perfection of Theoretical and Methodological Bases of NPP Safety Analysis in Case of Unlikely Emergency Events with Catastrophic Consequences. Diss. ... DTS.]. Odessa, ONPU Publ., 2016. 317 p.

Borisenko, V. I. O nekotorykh zakonomernos-tyakh posledstvii avarii na AES [On Some Regularities of Consequences of Accidents at NPP]. Problemi bezpeki atomnikh elektrostantsіi і Chornobilya, 2012, vol. 18, pp. 6-15.

Gus'kov, A. N., Rogovoi, S. V., Fomin, V. A Issledovanie tochnosti mekhanicheskoi obrabotki: Metodicheskie ukazaniya [Study of Machining Accuracy: Methodical Instructions]. Moscow, MIIT Publ., 2007. 20 p.

Komarov, A. D., Zheltov, I. N., Moiseev, V. K., Shalavin, V. V., Sharov, A. A. Tekhnologiya mekhanicheskoi obrabotki detalei: Uchebnoe posobie [Technology of parts machining: Educational Aid]. Samara : SGAU Publ., 2003. 60 p.

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