... 30kVA to 2500kVA4, Standard: GB/T10228, GB6450, IEC726, DIN425235, Insulation Level: LI75CA35/LI0AC36, Connection: Yyn0 or Dyn117, Transformer shell is optional ... , its production class is Ip20 or IP238, Wind-cool system and Temperature control system are both optional9, Real Maintenance-Free10, Absence of ...