Due to the hysteresis characteristics of ferromagnetic materials, residual magnetism remains in the core after performing operations such as voltage ratio measurement and DC resistance testing on the transformer.
Conversion of Steady-State Magnetic Flux into Residual Magnetism When Power is Cut Off
During transformer operation, steady-state magnetic flux is generated inside the core. When the transformer is de-energized, due to the conservation of magnetic flux in the circuit, the steady-state flux does not immediately disappear. Instead, it retains a residual magnetism with the same magnitude and polarity as the steady-state flux at the last moment before power-off.
Protecting Equipment Safety
Improving Measurement Accuracy
Ensuring Stable Grid Operation
Reducing Energy Consumption and Maintenance Costs