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

An Enhanced Analysis of Inter-Laminar Faults in Magnetic Cores With Grain Oriented Electrical Steels for Fault Diagnosis and Condition Monitoring: Theoretical Background and Experimental Verification

“…Most of the existing techniques are mainly developed for stator cores of turbo generators. Nevertheless, they can be further evolved and implemented for power transformers [16][17][18]. Core quality assessment of power transformers is mainly performed by measuring overall power losses of the core, known as no-load losses, as defined by the British standard BS EN 60076-1-2011 [19].…”

Residual Flux Measurement of Single-phase Transformers based on Equivalent Resistance

“…Then the charge (a variable) needs to be introduced to determine the direction of the residual flux, which will lead to more calculation errors [8]. In addition, there are two measurement methods, one of which is calculated by the relationship between the residual flux and current-related parameters [9][10][11], and the other is an iterative calculation of the dynamic hysteresis model, which has a more complex calculation process [12]. The use of magnetizing inductance to calculate the residual flux in the transformer core is likely to produce large computational errors due to the many external factors affecting the magnetizing inductance, which makes the fitting of the empirical formula difficult [13].…”