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Vertical-break disconnector DDV

Maximum reliability and minimal maintenance

The DDV vertical break disconnector requires the optimized spaces in both horizontal and vertical directions, making it suitable for substations with small installation area. The DDV disconnector range includes products for rated parameters 145 / 170 / 245 kV, 3150 A and 63 kA.

Main features

  • Self-aligning, double motion contact system for stability at higher short circuit levels
  • Jaw type contacts at the hinge and far end
  • Special reverse loop contact design for higher short circuit withstand capability
  • Contact opening of greater than 90 degrees
  • Tested and proven design for operation in seismic and icy conditions
  • Well balanced and mechanically safe and compact design
  • Prevention of over-travel
  • Simple and stable turn and twist arrangement

Why Hitachi Energy?

  • Worldwide experience
  • Maximum reliability and minimal maintenance
  • Energy efficient solution
  • Easy and quick erection
  • Reliable and smooth operation
  • Suitable for wide range of environmental conditions

Brief performance data

Rated voltage (kV) 245 170 145
Rated current (A) 3150 3150 3150
Short time withstand current (kA) 63 kA/3 s 63 kA/3 s 63 kA/3 s
Power frequency withstand voltage      
· against earth 545 385 335
· across isolating distance 600 423.5 368.5
Lightning impulse withstand voltage      
· against earth 1050 750 650
· across isolating distance 1155 825 715
power plant engineer for substation
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