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Horizontal center break disconnector SDF

Maximum reliability and minimal maintenance

The SDF disconnectors are available up to 550 kV, 4000 A and 63 kA. These type of disconnectors have a low friction design and offer minimized contact resistance. They are equipped with dead center interlocking for reliability in extreme conditions. Some other important features of these disconnectors are:

  • No external spring in contact fingers
  • Superior design of mechanical interlock
  • Strong rotary pedestals
  • Ice breaking capacity

Applications

The horizontal center break disconnector is used at substations due to its simplicity and flexibility in arrangement.
 

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 wide range of environmental conditions

Brief performance data

Rated voltage (kV) 72.5 123 145 170 245 300 362 420 550
Rated current (A) up to 4000(*)
Short time withstand current (kA) up to 63
Power frequency withstand voltage (kV)                  
· against earth 140 230 275 325 460 395 450 520 620
· across isolating distance 160 265 315 375 530 435 520 610 800
Lightning impulse withstand voltage (kV)
· against earth 325 550 650 750 1050 1050 1175 1425 1550
· across isolating distance 375 630 750 860 1200 1050 1175 1425 1550
  (+170) (+205) (+240) (+315)
Switching impulse withstand voltage (kV)
· against earth - - - - - 850 950 1050 1175
· across isolating distance - - - - - 700 800 900 900
  (+245) (+295) (+345) (+450)

(*) Higher current on request

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