The Rockwill SF6 generator circuit breaker is the latest generation of a well-proven GCB platform, designed for installation between the generator and the step-up transformer in power plants with unit ratings up to 180 MW. Its open, accessible layout and compact footprint make it particularly suitable for retrofit projects and systems with open busbar configurations.
The breaker employs SF6 arc-quenching technology with both main and arcing contacts enclosed in SF6 gas for safe and reliable interruption. An innovative built-in direct contact ablation display continuously indicates contact wear, delivering the highest degree of safety for power plants with frequent switching operations, such as pumped-storage hydropower plants.
Key Features
Open compact design： Small footprint enables easy integration into existing power plant layouts and retrofit installations
Direct contact ablation display： Built-in visual wear indicator enhances operational safety and simplifies maintenance planning
SF6 arc-quenching technology： Reliable interruption under both fault and normal switching conditions; main and arcing contacts fully enclosed in SF6
High switching endurance： Designed for the frequent start-stop and load-rejection cycles of pumped-storage and peaking plants
Flexible busbar connection： Adaptable to open busbar configurations common in generator auxiliary systems
Proven platform ： Based on a mature GCB design with field-proven reliability across multiple installations
Technical Parameters
General Ratings
Parameter
Value
Rated voltage (Ur)
24 kV
Rated short-circuit breaking current (Isc)
63 kA
Rated peak withstand current
160 kA
Rated short-time withstand current (3 s)
63 kA
Rated frequency
50 / 60 Hz
Insulation level (Um / PF / BIL)
24 / 50 / 125 kV
Continuous Current Rating
Variant
Rated Normal Current (Ir)
HVR-63XS
6300 A
HVR-63S
8000 A
Applications
Generator main circuit protection and control in thermal, hydro, gas-turbine, and pumped-storage power plants up to 180 MW
Retrofit replacement of existing generator circuit breakers with minimal civil works
Pumped-storage hydropower plants with daily start-stop and frequent switching duty
Industrial cogeneration and combined-cycle plants with medium-output generators
Open busbar auxiliary power systems requiring high continuous current capacity
Custom ratings (voltage, current, breaking capacity) and special operating mechanisms available on request. Contact Rockwill for application-specific design and quotation.
Main Categories: Medium and High Voltage Switchgear/Power and Distribution Transformers/Lightning Protection and Electrical Insulation/Substations and E-Houses/Electrical Panel and Controlgear
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The equipment supplier has passed platform qualification certification and technical evaluation, ensuring compliance, professionalism, and reliability from the source.
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