Scb11 dry transformer magnetizing inrush current

　The scB11 dry transformer inflow is the temporary current generated from the coil when the dry transformer is charged at full voltage. When the core residual magnetic beam of SCB11 dry transformer is in the same direction as the magnetic flux generated by the working voltage of SCB11 dry transformer before driving, its total magnetic flux far exceeds the core saturated magnetic beam, generating a large impulse current. The higher peak value can reach 6-8 times the rated current of SCB 11 dry type transformer. The excitation inrush current varies according to the Angle of system voltage when the dry-type transformer is put in, the residual flux of the dry-type transformer core and the impedance of the power supply system. When the voltage of the SCB 11 dry transformer passes through zero (flux peak), a greater surge current is generated. Scb11 dry transformer excitation inrush is composed of DC component and high harmonic component, which attenuates with time. That decay time depends on the resistance and the resistance. The impulse current of scB11 dry transformer with large capacity is generally 5 ~ 10 seconds, and that of SCB11 dry transformer with small capacity is generally 0.2 seconds.

　　Due to the high operating voltage of the generator, the flux density in the fixed subnucleus increases greatly. Iron consumption is proportional to the square of magnetism (or voltage), with a large increase in iron consumption and a large increase in core temperature. The rise of working voltage will accelerate the deterioration, deterioration and failure of the insulation of fixed subcoil. In particular, the insulation began to deteriorate, part of the insulation has a weak part of the generator, driving voltage is too high, the weak part of the insulation is damaged, short-circuit accident