FIELD: electric engineering.
SUBSTANCE: invention is related to electric engineering, namely to devices of power transformers protection. For this purpose comparison circuit supplied from rectified working and braking currents comprises high-Q inductivity connected parallel to available elements that forces positive-going and especially negative-going slopes of resulting pulse due to self-induction EMF. Moreover, integrating amplifier is used as relaxation circuit at device outlet. To eliminate high overstrain, a small capacitor is connected parallel to comparison circuit.
EFFECT: higher efficiency, i e makes it possible to quickly compare currents and slow down differential protection of transformer.
3 dwg
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