Conţinutul numărului revistei |
Articolul precedent |
Articolul urmator |
1022 5 |
Ultima descărcare din IBN: 2018-06-02 16:19 |
Căutarea după subiecte similare conform CZU |
621.314.1 (6) |
Electrotehnică (1154) |
SM ISO690:2012 МАНУСОВ, Вадим, ПАВЛЮЧЕНКО, Д., АХЬЁЕВ, Дж.. Анализ процессов ограничения токов короткого замыкания трансформатором с высокотемпературными сверхпроводящими обмотками. In: Problemele Energeticii Regionale, 2017, nr. 1(33), pp. 1-7. ISSN 1857-0070. |
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Problemele Energeticii Regionale | ||||||
Numărul 1(33) / 2017 / ISSN 1857-0070 | ||||||
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CZU: 621.314.1 | ||||||
Pag. 1-7 | ||||||
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Rezumat | ||||||
An important advantage of transformers with high-temperature superconducting winding is their ability to limit the short-circuit currents. The article discusses a physico-mathematical model that analyses transient processes at short-circuit currents in electrical networks containing transformers with a high-temperature superconducting winding. One of the main ideas and objectives of this work is to investigate the process of short-circuit currents limiting by means of a transformer with a hightemperature superconductor winding, which makes it possible to combine two series-connected elements in one device: transformer and a reactor. The effectiveness of this method is due to the fact that when the short-circuit currents exceed the critical value of the temperature of the superconductor winding, it goes to the normal state with high winding resistance for short-circuit currents. It is important to know when a superconductor should go over to a normal state with the loss of superconductivity. For this purpose, a program was developed to determine the amount of heat generated by a short-circuit current flowing before it is disconnected. For a transformer with hightemperature superconducting winding with a capacity of 40 MVA, a short circuit must be eliminated after 0.1 seconds, without switching off the transformer. To limit the short-circuit current; it is intended to use a hybrid winding. The performed assessment showed that the return of the winding to the superconducting state, first, depends on the ratio of the short-circuit currents to the operating current. This is the criterion for the return/non-return to the superconducting state. |
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Cuvinte-cheie трансформатор, сверхпроводниковая обмотка, реактор, предаварийный режим, токи короткого замыкания, энергоэффективность, потери мощности, ограничение |
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