A New Method to Measure the Residual Flux by Magnetic Sensors and a Finite-Element Model

Article Engineering, Electrical & Electronic

Residual Flux Measurement of Power Transformer Based on Transient Current Difference

Shipu Wu et al.

Summary: Residual flux density in power transformers can cause inrush current when the transformer is switched on with no load. This article proposes a method for measuring B-r based on applied dc voltage, utilizing finite element method for calculation and experimental verification to obtain an empirical formula for calculating B-r.

IEEE TRANSACTIONS ON MAGNETICS (2022)

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Article Nanoscience & Nanotechnology

Fast and in situ remanent flux detection method for a protection current transformer based on the fluxgate theory

T. Zheng et al.

Summary: This paper proposes a fast and in situ remanent flux detection method for a protection CT based on the fluxgate theory. A linear relationship between the remanent flux and the second harmonic of the high frequency component of the voltage is used to calculate the remanent flux. Simulation results show that the proposed method can quickly and effectively detect the remanent flux of a protection CT without removing it from the substation.

AIP ADVANCES (2021)

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Article Engineering, Electrical & Electronic

Residual Flux Density Measurement Method for Transformer Core Considering Relative Differential Permeability

Cailing Huo et al.

Summary: This article presents a residual flux density measurement method considering the relative differential permeability, analyzing the basic relationship between mu(rd) and B-r based on magnetic domain theory. Experiments and finite-element modeling were used to verify the feasibility and accuracy of the proposed method and empirical formula for calculating B-r.

IEEE TRANSACTIONS ON MAGNETICS (2021)

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Article Engineering, Electrical & Electronic

Research on Residual Flux Density Measurement for Single-Phase Transformer Core Based on Energy Changes

Cailing Huo et al.

Summary: This article proposes a residual flux density measurement method based on energy changes for a single-phase transformer core. The direction of residual flux density is determined by comparing energy changes, and the magnitude is calculated through an empirical formula. The method is validated to have higher accuracy than existing methods with a relative error within 5%.

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT (2021)

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Article Engineering, Electrical & Electronic