| Brand | ROCKWILL |
| Series | ZHN |
| Rated voltage | 24 kV |
| Rated normal current | 15,000 A |
| Insulation level | 24 / 50 / 125 kV |
| Rated frequency | 50 / 60 Hz |
The Rockwill electric brake switch is designed for rapid electrical braking and shutdown of large hydro-turbine generating units. It connects the generator to a braking resistor to dissipate kinetic energy during the deceleration phase, providing a controlled and wear-free braking method compared to mechanical braking systems.
The equipment consists of three single poles, each in an individual enclosed metal enclosure mounted on a common chassis. The brake switch uses SF6 as the insulation and arc-extinguishing medium, with arcing contacts made of ablation-resistant copper-tungsten material for high electrical endurance. An earthing switch is integrated and uses air insulation with a motor operating mechanism.
The brake switch is equipped with a hydraulic spring operating mechanism, and all three poles are driven via a three-phase mechanical linkage. A pressure relief device is fitted at the top; if the internal gas pressure exceeds 1.2 MPa due to an abnormal event, the gas is safely released.
| Parameter | Value |
|---|---|
| Rated voltage (Ur) | 24 kV |
| Rated normal current (Ir) | 15,000 A |
| Rated frequency | 50 / 60 Hz |
| Insulation level (Um / PF / BIL) | 24 / 50 / 125 kV |
| Rated making and breaking current | 28,000 A |
| Braking current (load break capability) | 30,000 A |
| Mechanical endurance | 10,000 operations |
| Operating mechanism (brake switch) | Hydraulic spring |
| Operating mechanism (earthing switch) | Motor-operated |
| Insulating medium (brake switch) | SF6 |
| Insulating medium (earthing switch) | Air |
| Cooling method | Natural |
| Pressure relief threshold | 1.2 MPa |
Electric braking is controlled and wear-free, avoiding mechanical friction loss and frequent maintenance of mechanical braking systems.
It is designed for large conventional hydropower stations and pumped storage power plants with high-inertia hydro-turbine generating units.
Yes, it supports generator deceleration control for pumped-storage and conventional hydro stations.
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