首页|Feasibility of using Normalized De-trapped Charge for Diagnosis of Power Transformer Insulation

Feasibility of using Normalized De-trapped Charge for Diagnosis of Power Transformer Insulation

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In order to use de-trapped interfacial charge as a performance parameter for diagnosis， it is necessary to reduce the influence of insulation geometry。 Available literature shows that this can be done by considering dc insulation resistance R<sub xmlns:mml="http://www。w3。org/1998/Math/MathML" xmlns:xlink="http://www。w3。org/1999/xlink">0</sub> as the normalization factor。 Such normalization may not be always practically feasible as information regarding R<sub xmlns:mml="http://www。w3。org/1998/Math/MathML" xmlns:xlink="http://www。w3。org/1999/xlink">0</sub> requires measurement of temperature sensitive low amplitude current。 In this paper it is shown that geometric capacitance C<sub xmlns:mml="http://www。w3。org/1998/Math/MathML" xmlns:xlink="http://www。w3。org/1999/xlink">0</sub> (instead of R<sub xmlns:mml="http://www。w3。org/1998/Math/MathML" xmlns:xlink="http://www。w3。org/1999/xlink">0</sub>) can be used as an effective normalization parameter to reduce effect of insulation geometry。 Effect of normalizing freed interfacial charge using C<sub xmlns:mml="http://www。w3。org/1998/Math/MathML" xmlns:xlink="http://www。w3。org/1999/xlink">0</sub> and R<sub xmlns:mml="http://www。w3。org/1998/Math/MathML" xmlns:xlink="http://www。w3。org/1999/xlink">0</sub> and its subsequent effect on insulation diagnosis are presented in this paper。

Power transformer insulationTemperature measurementMathematical modelOil insulationGeometry

D. Mishra、A. Baral、N. Haque、S. Chakravorti

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Electrical Engineering Dept., IIT (ISM) Dhanbad, Dhanbad, India

Electrical Engineering Dept., Jadavpur University, Kolkata, India

IEEE PES Asia-Pacific Power and Energy Engineering Conference

Kota Kinabalu(MY)

2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference

555-558

2018

10.1109/APPEEC.2018.8566434