... HDILP-138 These products are belongs to Series 5:Line Post Insulator:33kV,69kV,115kV,138kV Main Technical ParametersTypeRated voltage(kv) ... DS series:15kV,25kV,28kV,35kV Series 3: Pin type insulator:15kV,24kV,33kV Series 4: Station Post Insulator:15kV,36kV,69kV,132kV ... Series 5:Line Post Insulator:33kV,69kV,115kV ...