Релейная защита и автоматизация ЭС
Топливно-энергетический комплекс
Презентация
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Improvements to Transformer Differential Protection -Design and Test Experience
H.T. Yip, M. Moscoso, G. Lloyd, K. Liu, Z. Wang –ALSTOM Grid
21стр

Traditional bias characteristic:
Improves stability during CT saturation.
Considers 2nd harmonic blocking or restraining to provide stability during inrush.

Traditional bias characteristic limitations:
Dual slope characteristic on its own may not maintain stability without requiring excessive over-dimensioning of the CTs.
2nd harmonic technique may slow down the bias differential element when CT saturation occurs during inteal faults.
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