IEEE Guide for Establishing Power Transformer Capability while under Geomagnetic Disturbances

The mathematical model of a shell-core power transformer’s magnetization branch is substantiated. By using the model, analytical expressions for the magnetizing current instantaneous values under the conditions of geomagnetic disturbances can be obtained. Quantitative assessments of the magnetizing inrush current amplitudes and durations versus the geomagnetic disturbance intensity are obtained. The dynamics of the power transformer magnetic system saturation transient and changes in the magnetization inrush current amplitudes and durations after a sudden occurrence of geomagnetic disturbances are shown. The error of estimating the magnetizing inrush current amplitudes under geomagnetic disturbances is determined based on comparison with experimental data.

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Estimating the Amplitude of Power Transformer Magnetizing Inrush Currents Caused by Geomagnetic Disturbances

2021 International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM) ◽

10.1109/icieam51226.2021.9446317 ◽

2021 ◽

Author(s):

A. A. Kuvshinov ◽

V. V. Vakhnina ◽

A. N. Chernenko

Keyword(s):

Power Transformer ◽

Geomagnetic Disturbances ◽

Inrush Currents

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Modulation of the Power Transformer Magnetizing Inductance by Variations of Geomagnetically Induced Currents during Geomagnetic Disturbances

10.1109/uralcon52005.2021.9559580 ◽

2021 ◽

Author(s):

Vera V. Vakhnina ◽

Aleksey A. Kuvshinov ◽

Aleksey N. Chernenko

Keyword(s):

Power Transformer ◽

Geomagnetically Induced Currents ◽

Geomagnetic Disturbances ◽

Induced Currents

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IEEE Guide for Establishing Power Transformer Capability while under Geomagnetic Disturbances - Corrigendum 1

10.1109/ieeestd.2017.7811155 ◽

2016 ◽

Keyword(s):

Power Transformer ◽

Geomagnetic Disturbances

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The Assessment of a Magnetizing-Current Inrush of a Power Transformer

Journal of Physics Conference Series ◽

10.1088/1742-6596/2096/1/012135 ◽

2021 ◽

Vol 2096 (1) ◽

pp. 012135

Author(s):

A Kuvshinov ◽

V Vakhnina ◽

D Kretov ◽

A Chernenko

Keyword(s):

Power Transformer ◽

Piecewise Linear ◽

Current Amplitude ◽

Piecewise Linear Approximation ◽

Inrush Current ◽

Geomagnetically Induced Currents ◽

Geomagnetic Disturbances ◽

Magnetizing Inrush Current ◽

Magnetizing Current ◽

Induced Currents

Abstract The study aims to propose an analytical tool for determining the parameters of the power transformer magnetizing inrush current caused by geomagnetically induced currents flowing through high-voltage windings with a grounded neutral under the impact of geomagnetic disturbances on the power grid. The analytical equations for the instantaneous magnetizing current under geomagnetic disturbances were obtain by mathematical model of magnetizing branch for a shell-type power transformer. A model base on a magnetization characteristics piecewise-linear approximation for the electrical steel. The magnetizing inrush current amplitude and duration it was found depends on the intensity of geomagnetic disturbances and in cope-link with the dynamics of the power transformer core saturation transient process were determined the changes in the magnetizing inrush current amplitude and duration under geomagnetic disturbances. The magnetizing inrush current amplitude it was found may reach the level of short-circuit current periodic component at the point of power transformer grid connection. The results were verify by comparing the design and experimental values of the magnetizing inrush current amplitude. The advantages of proposed mathematical model shown with justifying the analogy between core saturation under connecting of power transformer to a grid and under geomagnetically induced currents exposed. The piecewise-linear approximation of power transformer magnetization characteristic, allow to obtain the amplitude value of magnetizing inrush current caused by geomagnetically induced currents with an accuracy of 6% and can be used with power grid steady state and transient simulation under geomagnetic disturbances.

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Power Transformer Condition Monitoring and Diagnosis

10.1049/pbpo104e ◽

2018 ◽

Keyword(s):

Condition Monitoring ◽

Power Transformer ◽

Monitoring And Diagnosis

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Effect of No-load and Load Condition on Transformer Sound

International Journal of Scientific Research in Science Engineering and Technology ◽

10.32628/ijsrset184113 ◽

2018 ◽

pp. 11-15

Author(s):

Dr. Hitesh Paghadar

Keyword(s):

Experimental Study ◽

Power Transformer ◽

Load Condition ◽

Noise Pollution ◽

Sound Level ◽

Measurement Scale ◽

Dominant Factor ◽

Public Attention ◽

Level Measurement ◽

Human Ear

Increasing environment noise pollution is a matter of great concern and of late has been attracting public attention. Sound produces the minute oscillatory changes in air pressure and is audible to the human ear when in the frequency range of 20Hz to 20 kHz. The chief sources of audible sound are the magnetic circuit of transformer which produces sound due to magnetostriction phenomenon, vibration of windings, tank and other structural parts, and the noise produced by cooling equipments. This paper presents the validation for sound level measurement scale, why A-weighted scale is accepted for sound level measurement, experimental study carried out on 10MVA Power Transformer. Also presents the outcomes of comparison between No-Load sound & Load sound level measurement, experimental study carried out on different transformer like - 10MVA, 50MVA, 100MVA Power Transformer, to define the dominant factor of transformer sound generation.

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