A Way of Increasing Maximum Permissible Short-Circuit Surge Currents in Electrical Contacts

A.M. Chalyi, В.А. Дмитриев, M.A. Pavleino, O.M. Pavleino, M.S. Safonov

Результат исследований: Научные публикации в периодических изданияхстатья

Выдержка

При протекании тока через электрические контакты происходит дополнительное тепловыделение, связанное с наличием контактного сопротивления. Это может привести к их значительному нагреву. В сильноточных контактах высоковольтных электрических аппаратов проблема нагрева проявляется наиболее остро при протекании аварийных токов короткого замыкания. Максимально допустимый уровень таких токов ограничен нагревом контактных областей до температуры плавления. Сварки, вызванные плавлением материала контактов, как правило, приводят к потере работоспособности аппаратов. Предложен способ значительного увеличения уровня допустимых токов короткого замыкания. Он состоит в предварительном последовательном импульсном нагреве контактов до температуры, превышающей температуру рекристаллизации материала. Этот эффект подтвержден экспериментально. Проведено численное моделирование процесса импульсного нагрева. Его результаты позволили выработать рекомендации по выбору параметров серии импульсов тока, воздействие которых на контакты позволяет заметно увеличить их стойкость к токам короткого замыкания.
Язык оригиналаанглийский
Страницы (с-по)569-574
ЖурналTechnical Physics
Том64
Номер выпуска4
DOI
СостояниеОпубликовано - апр 2019

Отпечаток

short circuits
short circuit currents
electric contacts
heating
heat
contact resistance
recommendations
melting points
high current
high voltages
melting
causes
pulses
simulation
temperature

Предметные области Scopus

  • Физика и астрономия (все)

Цитировать

Chalyi, A.M. ; Дмитриев, В.А. ; Pavleino, M.A. ; Pavleino, O.M. ; Safonov, M.S. / A Way of Increasing Maximum Permissible Short-Circuit Surge Currents in Electrical Contacts. В: Technical Physics. 2019 ; Том 64, № 4. стр. 569-574.
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abstract = "Current passing through electrical contacts causes additional heat release due to the presence of a contact resistance. Heat release in contacts may be considerable. In high-current contacts of high-voltage electrical equipment, the problem of overheating gets worse when fault short-circuit currents pass through the contacts. The maximum permissible level of these currents is limited by heating contact areas to their melting point. Welds due to melting of contacts lead to their failure as a rule. A way of considerably raising maximum permissible short-circuit currents has been suggested. Its idea is impulsive preheating of contacts to a temperature higher than the recrystallization temperature of the contact material. The efficiency of this approach has been confirmed experimentally. Numerical simulation of impulsive heating has been conducted. The results have helped us elaborate recommendations for selecting parameters of a train of current pulses that, acting on a contact, may greatly improve its stability against short-circuit currents.",
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Chalyi, AM, Дмитриев, ВА, Pavleino, MA, Pavleino, OM & Safonov, MS 2019, 'A Way of Increasing Maximum Permissible Short-Circuit Surge Currents in Electrical Contacts', Technical Physics, том. 64, № 4, стр. 569-574. https://doi.org/10.1134/S1063784219040078

A Way of Increasing Maximum Permissible Short-Circuit Surge Currents in Electrical Contacts. / Chalyi, A.M.; Дмитриев, В.А.; Pavleino, M.A.; Pavleino, O.M.; Safonov, M.S.

В: Technical Physics, Том 64, № 4, 04.2019, стр. 569-574.

Результат исследований: Научные публикации в периодических изданияхстатья

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AU - Safonov, M.S.

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