... 2.small sized 3.compacted structure 4.running safely 5.easy maintenance and mobile YBM BOX SUBSTATION(Non-Metallic) YBM, YBP ... the power. YBM, YBP series of prefabricated substation is complete set, small sized, compacted structure, running safely, easy maintenance, and mobile. And ... the standard of GB/T 17467-1998 (HV/LV prefabricated substation). The shell is made of non-metal, composite board or ...