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Generator circuit-breaker HEC 7/8 for 170-210 kA

One step ahead in SF6 technology

With short-circuit ratings from 170 to 210 kA, HEC 7/8 is suitable for power plants up to 1,600 MW and is recommended for retrofits or replacements of old generator circuit-breakers (GCBs) in air-blast technology. Naturally cooled up to 25,000 A, its interrupting technology allows to clear fault currents exhibiting very high degree of asymmetry up to 120-130 percent.

The 3-phase system includes circuit-breaker, disconnector, capacitors and control cubicle, and offers a wide selection of additional components, such as earthing and starting switches, current and voltage transformers and surge arresters. It is delivered fully assembled to minimize the installation and commissioning time at site.
 

Applications

  • Rated short-circuit current up to 210 kA for application in the largest power plants
  • Load current up to 28,000 A
  • GCB system solution for power plants up to 1,600 MW

Why Hitachi ABB Power Grids?

  • Naturally cooled up to 25,000 A
  • With more than 300 references, HEC 7/8 secures reliable operation in power plants all around the world
  • Its state-of-the-art technology ensures safe operation and interruption of short-circuit currents up to 210 kA
  • Fully type tested according to IEEE C37.013, the worldwide GCB standard
  • Available options:

Brief performance data

System Type HEC 7A/8A HEC 7B/8B HEC 7C/8C
Rated maximum voltage [kV]: 30 27.5 25.2
Rated frequency [Hz] 50 / 60 50 / 60 50 / 60
Rated power frequency withstand voltage [kV] 80 80 80
Rated lightning impulse withstand voltage [kV] 150 150 150
Rated short-circuit breaking current [kA] 170 190 210
       
HEC 7/8 with 50 Hz      
Rated normal current [A]: HEC 7 up to 25,000 up to 25,000 up to 25,000
Rated normal current [A]: HEC 8 up to 28,000 up to 28,000 up to 28,000
       
HEC 7/8 with 60 Hz      
Rated normal current [A]: HEC 7 up to 22,000 up to 22,000 up to 22,000
Rated normal current [A]: HEC 8 up to 26,500 up to 26,500 up to 26,500
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Generator circuit-breaker HEC 7/8 for 170-210 kA