Online Saturation Detection of High-Voltage Current Transformers of Electric Substation Three-Phase Primary Measuting Channels in Power Systems Transients

Pankiv, V.I.; Tankevych, E.M.

doi:10.15407/techned2019.02.063

Cited by 1 publication

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“…Виявлення насичення магнітопроводів ТС здійснюється за розробленим авторами методом та алгоритмом онлайн визначення періодів їхнього насичення, що ґрунтуються на використанні точної математичної моделі електромагнітних процесів у ПВК струму за умов КЗ в ЕЕС і цифровій обробці вихідних струмів ПВК методом дискретних перетворень Фур'є [45].…”

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Minimizing the Effect of Saturation of High-Voltage Current Transformers on the Accuracy of Three-Phase Primary Measuting Channels With Digital Output

Pankiv¹,

Tankevych²,

Tankevych³

et al. 2021

Teh. elektrodin.

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The classification is carried out and the characteristics, capabilities and disadvantages of the known methods of programmed correction of the output current of a single-phase primary measuring channel (PMC) of the current are determined. A discretized model of short-circuit current (SCC) is proposed. A method and an algorithm for increasing the accuracy of a three-phase current PMC in transient modes of electric power systems (EPS) under the condition of saturation of the magnetic circuits of its phase current transformers have been developed. The reliability of the developed method is confirmed by simulation of the PMC output current under the condition of phase-to-phase short-circuit of phases A and B without correction and with correction of its phase currents. It is shown that the developed method makes it possible to reduce the total error of the PMC in the transient modes of the EES under the condition of saturation of the magnetic circuits of the CT from 70-90% to 6-15%. References 47, figures 6, table 1.

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