Shell-type transformers use an anti-огцом coil with high dielectric strength to resist the influence of pulse хүчдэлийн. Since shell-type transformers use coils with large surface area, the series capacitance between coils is large. When a огцом is applied, it can Distributing the хүчдэлийн reasonably, the surge coil is a non-oscillating winding, which can suppress the voltage oscillation caused by the pulse voltage.