When the core of the frequency tripling transformer is variable section, its efficiency and thermal stability increase.
采用变截面铁心结构，可提高三倍频变压器的效率和热稳定性。
A kind of medium voltage AC variable frequency control system, which consists of voltage source inverter, sinuous filter and stepup transformer with variable frequency, is introduced.
介绍一种采用低压电压型变频器、正弦波滤波器和变频升压变压器构成的低-高式中压变频控制系统。
应用推荐