Overview 

The HVR-63 generator circuit-breaker (GCB) is the latest generation of well-proven HGI generator circuit-breaker series and it is best suited for retrofit in power plants with a unit power of up to 180 MW. The open design and small footprint make it perfect for systems with open busbar and short-circuit ratings up to 63 kA. Our innovative built-in direct contact ablation display offers the highest degree of safety and reliability for power plants with frequent switching operations such as pumped storage power plants. The HVR generator circuitbreaker is available as HVR-63XS with rated continuous currents up to 6300 A or as HVR-63S with rated continuous currents up to 8000 A. Both variants offer flexible busbar connection. With this new HVR-63 GCB, continues to lead the way in designing the most advanced GCBs.

Hydraulic spring operating mechanism

Advanced operating system delivers stability and dependability The hydraulic spring operating mechanism combines the advantages of a hydraulic operating mechanism with those of spring energy storage system. Energy storage is accomplished with the aid of a disk spring assembly, with the advantages of stability, reliability and resistance to temperature variability. Tripping of the operating mechanism and energy output arebased on proven design elements of the hydraulic operating technique, such as control valves and hydraulic cylinders. The operating mechanism is based on the differential piston principle. For the closing operation the piston head side is isolated from the low pressure and simultaneously connected to the high pressure oil volume. As long as the pressure is maintained, the piston remains in the “closed” position. A pressure controlled mechanical interlock prevents movement of the piston to the “open” position in case of a pressure drop. For the opening operation, the piston head side is isolated from the high pressure and simultaneously connected to the low pressure oil volume. The charging state of the spring disk assembly is controlled by switching elements, actuating the pump motor to immediately maintain the oil pressure. A non-return valve between pump and high-pressure oil volume prevents pressure loss in the event of a pump outage. The hydraulic system is hermetically sealed against atmosphere. The mechanically operated position indicator provides reliable indication of the circuit-breaker position. The drive operates all three circuit-breaker poles simultaneously by mechanical linkages, thus keeping the switching time difference between the poles to a minimum.

Technology parameters