Description：

This product is suitable for water and thermal power plants with a single generator unit capacity of 300-400 megawatts. It has a large current carrying capacity and strong breaking capacity. It was appraised by the China Machinery Industry Federation in 2019, and its comprehensive technical performance has reached the international leading level. Currently, it has supplied multiple power plants.

Product Performance:

• Implemented according to the latest lEC standards.

• High insulation level: meeting the insulation requirements of the products under the environment of 3,000m above sea level.

• High long-term flow capacity: adopts natural cooling, no auxiliary heat dissipation device, and rated flow capacity up to 15,000A.

• Excellent breaking performance: The effective values of Ac component of short-circuit breaking current is 100kA and the DC component is as high as 82%, which meets the current breaking requirements under various fault conditions.

• High mechanical reliability: Innovative design of circuit breaker drive ensures that the product can meet the breaking performance under the small input operation work, and realize the mechanical life requirement of operation for 10,000times.

• Comprehensive safety protection measures: Pressure release device is installed at the top of the circuit breaker When the gas pressure in the arc extinguishing chamber exceeds 1.2Pa 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:

• The product consists of three single poles, and each pole has an individual enclosed metal enclosure mounted on the same chassis.

• Circuit breaker is equipped with hydraulic spring operating mechanism: the disconnector and earthing switch are equipped with motor operating mechanism; the driving modes are all three phase mechanical linkage.

• The main circuit adopts natural cooling.

• Each operating mechanism is installed on the side of the product close to the control cabinet.

• SF6 is used as arc extinguishing and insulation medium for circuit breaker, and the arc extinguishing chamber adopts a new type of arc extinguishing chamber which combines self-energy arc extinguishing with auxiliary air-compressor arc extinguishing, which effectively reduces the operating work and perfectly solves the problem of short-circuit current breaking of various energies.

• The disconnector and the circuit breaker are connected in series, arranged in the same enclosure, using the air as the insulation medium, the fixed contact is located at the circuit breaker side, and the moving contact is in the telescopic direct-acting structure, which has the advantages of simple structure with small occupancy size and high current capability.

• The earthing switches are arranged on both sides of the incoming and cut going lines respectively, and using the air as the insulation medium, The fixed contacts are located on the high potential side, which are installed on the support of the main circuit, and the moving side is installed on the bottom plate of the box body. The moving contacts are connected with the single-phase enclosure and form earthing loop through the metal-enclosed isolated phase busbars connected with the moving contacts.
  

Typical applications:

Main technical parameters：

What is a generator circuit breaker？

A generator circuit breaker is a special type of circuit breaker used to connect a generator to the power grid system. Its primary functions are to control the synchronization and disconnection of the generator with the grid under normal conditions, which means it enables the connection and disconnection of the generator to and from the grid. For example, once the generator starts up and reaches its rated parameters, the generator circuit breaker is used to connect it to the grid, allowing the generator to begin supplying electrical power to the grid. Additionally, in the event of a generator fault (such as a short circuit or overload) or a grid-side fault that could affect the safe operation of the generator, the generator circuit breaker can quickly disconnect the electrical connection between the generator and the grid, thereby protecting both the generator and the grid system.