Reducing the Risk of Damage to Power Transformers of 110 kV and Above Accompanying Internal Short Circuits

L’vova, M. M.; L’vov, S. Yu.; Komarov, V. B.; Lyut’ko, E. O.; Vdoviko, V. P.; Demchenko, V. V.; Belyaev, S. G.; Savel'ev, V. A.; L’vov, M. Yu.; L’vov, Yu. N.

doi:10.1007/s10749-015-0561-y

Cited by 2 publications

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“…Уменьшение электрической прочности трансформаторного масла наблюдается при постепенном возрастании содержания механических примесей в масле. Примеси возникают в процессе изготовления изоляции, при эксплуатации из-за отрыва частиц от твердых барьеров из электротехнического картона, а также при старении масла и оказывают значительное влияние на изоляцию всей конструкции [3].…”

Section: Impact Of Distribution Of Impurity Particles On Electric Strunclassified

“…Нормативные показатели, принятые в РФ 3 , отличаются от рекомендуемых международными организациями СИГРЭ и МЭК 4 в сторону уменьшения качества изоляции. По рекомендации СИГРЭ, предусмотрен для эксплуатации 9-й класс чистоты жидкости [3]. Повышение качества трансформаторного масла по параметру содержания механических частиц примесей встречает сопротивление со стороны эксплуатирующих энергетических предприятий, так как это влечет дополнительные эксплуатационные расходы.…”

Section: Impact Of Distribution Of Impurity Particles On Electric Strunclassified

“…Определение и анализ влияния распределения частиц примесей на характеристики электрической прочности трансформаторного масла проводились с применением методов математической статистики [8,9]. 3 Там же. 4 IEC 60422(2013).…”

Section: Impact Of Distribution Of Impurity Particles On Electric Strunclassified

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Impact of distribution of impurity particles on electric strength of transformer oil

Melnikova

2019

Vestnik IGEU

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To extend the service life and ensure the operability of oil-filled transformer equipment, the attention is paid to the development of methods for monitoring the state of oil-barrier insulation. When monitoring the technical condition of transformer oil, the class of liquid purity is determined depending on the rated voltage of the equipment. However, the influence of the parameters of mechanical impurities on the breakdown voltage is not taken into account, thereby lowering the requirements for the quality of oil barrier insulation. This makes it relevant to study the influence of the size distribution of impurity particles on the electric strength of the internal insulation of power transformers and determine the parameters of particles of mechanical impurities to justify the underestimation of the quality indicators of transformer oil in operation. Methods of mathematical statistics were employed using the Gnedenko-Weibull distribution based on the standard values of liquid purity classes. To determine the maximum and minimum voltages, the standard values of the average breakdown voltages and the results of operational tests of transformer oil in a standard spark gap were used. The relation between the particle size of mechanical impurities and the breakdown voltage of transformer oil has been established. The particle size distribution of impurities has been obtained for 12 and 13 classes of liquid purity for power transformers with a voltage of 110–750 kV. The particle size range that defines the maximum and minimum breakdown voltages has been determined, and the values of limit concentrations of mechanical particles have been established. The obtained parameters of impurity particles which determine the maximum and minimum breakdown voltages of the operating oils can be used to evaluate the technical condition when diagnosing the internal insulation of power transformers in order to increase their operational reliability, as well as to adjust the regulatory requirements for the quality of operational transformer oil according to the content of mechanical impurities.

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Section: Impact Of Distribution Of Impurity Particles On Electric Strunclassified