... ,ER,ETD,EPC,RM,EFD,PQ series 4.Ferrite core electric transformer Features:1)Hight power output 2)High efficiency 3 ... of antipollution--Large transmission power--Stable performance and low temperature rise--EI,EF,MQ,PQ8.3,10,13,16.19.20 ... be designed to customer requirement. OEM orders are also welcomed.: Electric transformer 20/33kv with different types