LIFE SAFETY
Mlotok A.V., Еrshov A.M., Valeev R.G., Sidorov A.I.
ALEKSEI V. MLOTOK, OJSC Interregional Distributive Grid Company of Urals – Chelyabenergo, Chelyabinsk, Russia,
e-mail: secr@chel.elektra.ru;
ALEKSANDR M. ЕRSHOV, PhD, e-mail: a.m.ershov@mail.ru;
RUSTAM G. VALEEV, e-mail: valeevrustam@mail.ru;
ALEKSANDR I. SIDOROV, Doctor of Technical Sciences, e-mail: bgd-susu@mail.ru;
South Ural State University (National Research University), Chelyabinsk, Russia.
Determining residual stresses with the weight function method in fracture mechanics
Various kinds of damage occur in 380 V electrical networks with overhead line bare wires when operating: monophase short circuits between the phase and neutral wires; monophase ground faults; phase and neutral wire breaks, etc. The investigation of the processes occurring in these cases is carried out with the use of mathematical, computer, and physical models. However, the performance of experiences in natural conditions is rather hazardous for the consumers of the electric power and as well as for the environment.
To carry out experimental investigation, Chelyabenergo, the Chelyabinsk Branch of the OJSC MRSC of Urals has established an experimental electrical network with voltage 380 V in its experimental site. The network comprises a transformer of 160 kVA voltage of 10/0,4 kV and overhead line bare wires, 481 m in length; it is powered by a 110/10 kV voltage substation with the 6300 kVA transformer mounted in it. The capacity of the network is per phase adjustable resistance.
A wide range of field experiments are intended to be performed in the experimental electrical network: studying the changes of currents and voltages, examining theoretically the recognition criteria of various operational modes, testing prototypes and serial samples of various protection devices, and assessing the electrical safety under various operating conditions of electrical networks.
Key words: electric network with voltage 380 V, monophase short circuit, open circuit phase and neutral wires.
REFERENCES
1. Anisimova N.D., Venikov V.A., Zhukov V.V., Calculations and analysis modes networks. Moscow: Energiya, 1974, 336 p. (in Russ). [Anisimova N.D., Venikov V.A., Zhukov V.V. Raschjoty i analiz rezhimov raboty setej. M.: Jenergija, 1974. 336 s].
2. Budzko I.A., Leschinskaya T.B., Sukmanov V.I., Electricity agriculture. Moscow, Kolos, 2000, 536 p. (in Russ). [Budzko I.A., Leshhinskaja T.B., Sukmanov V.I. Jelektrosnabzhenie sel'skogo hozjajstva. M.: Kolos, 2000. 536 s.].
3. Venikov V.A., Similarity theory and modeling (applied to the problems of electric power). Moscow, High School, 1976, 479 p. (in Russ). [Venikov V.A. Teorija podobija i modelirovanie (primenitel'no k zadacham jelektrojenergetiki). M.: Vysshaja shkola. 1976. 479 s.].
4. Ershov A.M., Valeev R.G., Mlotok A.V., Sidorov A.I., The research of emergency modes in rural electrical networks voltage of 380 V, Technology in the agriculture, 2013;6:18-21. (in Russ). [Ershov A.M., Valeev R.G., Mlotok A.V., Sidorov A.I. Issledovanie avarijnyh rezhimov v sel'skih jelektricheskih setjah naprjazheniem 380 V // Tehnika v selskom hozjajstve. 2013. № 6. S. 18–21].
5. Krjuchkov I.P., Starshinov V.A., Gusev Ju.P., Piratorov M.V., Transients in power systems. Moscow, Publishing House of MEI, 2008, 416 p. (in Russ). [Krjuchkov I.P., Starshinov V.A., Gusev Ju.P., Piratorov M.V. Perehodnye processy v jelektrojenergeticheskih sistemah: uchebnik dlja vuzov. M.: Izdatel'skij dom MJeI, 2008. 416 s.].
6. Tetel'baum I.M., Electrical modeling. Moscow, Fizmatgiz, 1959, 319 p. (in Russ). [Tetel'baum I.M. Jelektricheskoe modelirovanie. M.: Fizmatgiz, 1959. 319 s.].
7. Edward W.K., Power System Stability. IEEE Press Series on Power Engineering Publisher: Wiley-IEEE Press, 1995, Vol. 1, 366 p.