Sensitivity of Power Station Auxiliary Network to the Possibility of Ferroresonance Occurrence

Wiśniewski, J.; Anderson, E.; Karolak, J.

doi:10.12736/issn.2300-3022.2014414

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2020

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“…There can also appear transients with frequency much lower than the rated power frequencye.g. 25Hz or even a few Hz, as a result of post-fault oscillations, caused by a ferroresonance [2] connected with nonlinear inductivity of voltage transformers inserted into power network.…”

Section: Introductionmentioning

confidence: 99%

International Journal of Electronics and Telecommunications

Kuliński¹,

Heyduk²

2020

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In Polish coal mining, medium voltage power distribution networks operate with an insulated neutral point. Zero-sequence current transformers are the basic sensors that generate input signals for earth-fault protection relays. In the literature, the problem of frequency response analysis of various types of current transformers has been examined many times, e.g. [1] [2], but not for zero-sequence current transformers so far. As part of the work, two types of zero-sequence current transformers in the range from 0.1 Hz to 100 kHz were tested. Both the change of the current ratio and the angular shift between the transformer secondary current and the total primary current were analyzed.

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Section: Introductionmentioning

confidence: 99%