History

2020's

  • – Renaming the company from HM to DTR.
  • – HM Corporation established that the electric business division of SPT corporation will be divided as the equity spinoff of the corporation.
  • – Renaming the company from DTR Electric to SPT.
  • – Epoxy Insulated Fault Interrupters for Overhead Line Developed
  • – Single Phase Electricity Meter Developed
  • – DTR Electric was separated by DTR and established an independent corporation.
  • – Gas Insulated Load Break Switches for Underground Line Developed
  • – Epoxy Insulated Fault Interrupters for Overhead Line Developed
  • – Gas Insulated Load Break Switch for Overhead Line Developed – Polymer Recloser for Overhead Line Developed
  • – Line disconnector Switches for 1 Pole and 3Pole Developed
  • – Polymer Pin Type Insulator(High voltage) Developed – Cable Joint kits for Distribution Class Developed – Current Limiting Arcing Horn Developed
  • – Polymer Cutout Switch for Distribution class Developed – Transmission Polymer Insulator Developed up to 500kV

2010's

  • – Cable Termination for Distribution Class Developed
    – Single Piece Termination Distribution Class Developed
  • – Polymer Line Post Insulator for Distribution Developed
    – Polymer Support Insulator for Distribution Developed
    – Polymer Pin Type Insulator(Low voltage) Developed
  • – Polymer Dead-end & Suspension Insulator for Distribution
    – Class Certified according to IEC ANSI and CEA standard
    – DTR Product was approved by Rural Utilities Service(RUS)
    – Which is Electric Company in USA
  • – Transmission Line Polymer Insulator Developed
    – Polymer Surge Arrester for Station and Intermediate
    – Class 2 & class 3 Developed
  • – ISO 14001:2004 Certified
    – Polymer Dead-end & Suspension Insulator 15kV to 69kV
    – Polymer Surge Arrester 3kV to 54kV for 5kA
    – Polymer Surge Arrester 3kV to 54kV for 10kA Class 1
    – Zinc Oxide Block for 10kA Class 1 Developed
  • – ISO 9001:2004 Certified
    – Zinc Oxide Block for 5 kA
  • – Yusan 2 Plant of DTR Corp. Founded

1970's ~ 1990's

  • – QS 9000 / ISO 9001 Certified
    – Polymer Insulator for Distribution Class Developed
    – Polymer Surge Arrester for Distribution Class Developed
    – Zinc Oxide Block for Distribution Class Developed
  • – DTR Corp. Established
  • – Dong Ah Tire & Rubber Corp. Established