Generator circuit-breaker HEC 9 for 250-300 kA
The world’s largest generator circuit-breaker (GCB)
HEC 9 has been developed as a system for large-sized power plants such as nuclear, coal-fired and hydropower plants. It has the world's highest performance with short-circuit currents up to 300 kA and it is also highly suitable for retrofits or replacements of old GCBs in air-blast technology.
Based on Hitachi Energy's well-proven and highly reliable SF6 technology, it enables lower lifecycle costs and gives a time-to-overhaul period of up to 20 years.
It is delivered in single-phase systems to facilitate the transportation and installation with plug-in design to minimize the activities at the site. Besides circuit-breaker, disconnector, capacitors and control cubicle, it also includes a wide selection of additional components such as earthing and starting switches, current and voltage transformers and surge arresters.
Applications
- Load current up to 33,500 A
- Power units up to 2000 MW
- Indoor or outdoor installations
- Replacements or retrofits of old units
Why Hitachi Energy?
- Naturally cooled up to 28,500 A
- Delivers the highest performance rates
- Provides the lowest lifecycle costs - maximum system availability and reliability
- Based on SF6, it is the only alternative to old and obsolete GCBs in air-blast technology
- Fully type tested according to IEEE C37.013, the worldwide GCB standard
Available options:
Brief performance data
| System Type | HEC 9-250L | HEC 9-250XL | HEC 9-300L | HEC 9-300XL |
|---|---|---|---|---|
| Rated maximum voltage [kV] | 31.5 | 31.5 | 31.5 | 31.5 |
| Rated frequency [Hz] | 50 / 60 | 50 / 60 | 50 / 60 | 50 / 60 |
| Rated power frequency withstand voltage [kV] | 80 | 80 | 80 | 80 |
| Rated lightning impulse withstand voltage [kV] | 150 | 150 | 150 | 150 |
| Rated short-circuit breaking current [kA] | 250 | 250 | 300 | 300 |
| HEC 9 with 50 Hz *) | ||||
| Rated normal current [A]: natural cooled | up to 28,500 (naturally cooled) |
up to 33,500 (enhanced convection) |
up to 28,500 (naturally cooled) |
up to 33,500 (enhanced convection) |
| HEC 9 with 60 Hz *) | ||||
| Rated normal current [A]: natural cooled | up to 26,500 (naturally cooled) |
up to 32,500 (enhanced convection) |
up to 26,500 (naturally cooled) |
up to 32,500 (enhanced convection) |
| *) with IPB longitudinal forced air cooling | up to 57,000 | up to 57,000 |
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