... the qualities as follows:1. Voltage resource VFD, direct input of3,3.3,4.16,6,606 and 10 kV,direct output ... save vast energy.Following standardHARSVERT-A series of Medium Voltage VFD satisfy the standards below as well asrelated clauses of ... for low voltage frequency systemGB/T 13422-92 Semiconductor power VFD experimentation standardGB/T 14436-93 Electrical equipment configuration technique condition ...