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Horizontal knee disconnector DDK

Maximum reliability and minimal maintenance

The horizontal knee disconnector requires the smallest spaces in both horizontal and vertical directions, suitable for substation with small installation area. The DDK800 disconnector is available for rated parameters 800kV, 3150A and 50kA

  • Self-aligned contact system
  • Special spring-less contact design to prevent opening of contact during short circuit
  • Minimized contact resistance
  • Stable open/close movement of disconnectors;
  • Driving and driven pipe well supported by compression and extension spring
  • Large contacting area between moving contacts and fixed contacts
  • Guiding device

Maximum reliability and minimal maintenance

The horizontal knee disconnector requires minimal space in both horizontal and vertical directions making them ideal for substations with small installation area.
 

Why Hitachi ABB Power Grids?

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

Brief performance data

Rated voltage (kV) 800 kV
 Rated current (A) 3150
 Short time withstand current (kA) 50 kA/3s
 Power frequency withstand voltage  
 against earth 830
 across isolating distance 1150
 Lightning impulse withstand voltage  
 against earth 2100
 across isolating distance 2100+(455)
 Switching impulse withstand voltage  
 against earth 1550
 between phases 2480
 across isolating distance 1175+(650)
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