This product is an essential switch equipment for achieving rapid shutdown of large hydroelectric generators. In 2019, it was appraised by the National Energy Administration and its comprehensive technical performance is at the leading domestic and international level. Currently, it has supplied 28 products to the Wudongde and Baihetan hydropower stations.
Product Performance:
1,High braking performance parameters: it has the capacity of braking current 30,000A and braking time 50 minutes.
2,High mechanical reliability: the brake switch and earthing switch can meet the mechanical life requirements of operation for 10,000 times.
3,Strong making capacity: the brake switch successfully passed the load current breaking and making test, and the current is 28,000A.
4,Reliable safety protection measures: pressure release device is installed at the top of the brake switch. When the gas pressure in the arc extinguishing chamber exceeds 1.2 MPa due to an accident, the gas will be released to ensure the safety of the personnel and surrounding equipment, The product design can ensure the stable operation of the power plant.

Product Structure:

1,Product consists of three single poles, and each pole has an individual enclosed metal enclosure mounted on the same chassis.
2,Brake switch is equipped with hydraulic spring operating mechanism; earthing switch is equipped with a motor operating mechanism; the driving modes are all three-phase mechanical linkage.
3,The main circuit adopts natural cooling.
4,Each operating mechanism is installed on the side of the product close to the control cabinet.
5,SF6 is used as insulation and arc-extinguishing medium for brake switch, The arc-striking contact adopts ablation-resistant copper-tungsten material, which effectively improves the reliability and electrical life of the brake switch.
6,The earthing switch takes air as insulation medium, the fixed contact is installed on the support of the main circuit, the moving side is installed on the bottom plate of the box body, and the moving contact is connected with the single phase enclosure and forms the earthing circuit through the closed bus bar connected with the moving contact.
7,The overall structure of brake switch is compact and convenient for installation and maintenance on site.
Typical applications:


 Main technical parameters: