LW36 - 72.5 - 126 high - voltage sulfur hexafluoride (SF6) AC circuit breaker for 110KV high - volta

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The LW36 - 72.5 - 126 high - voltage SF6 AC circuit breaker is an important electrical equipment suitable for 110KV high - voltage transformers. The following are some detailed information about it:

1. **Basic Working Principle**: - This circuit breaker uses sulfur hexafluoride (SF6) gas as an insulating and arc - extinguishing medium. SF6 gas has excellent insulating properties and arc - extinguishing capabilities, and can quickly extinguish the arc when the circuit breaker opens the circuit, ensuring the safe disconnection of the circuit.

- It adopts the self - energy arc - extinguishing principle, making full use of the energy of the arc itself to generate the air pressure required for arc - extinguishing, thereby reducing the energy requirement for the operating mechanism and making the operating work of the circuit breaker smaller.

2. **Structural Features**: - Generally, a three - phase porcelain column - type single - break structure is adopted, with a novel and delicate appearance. This structural design makes the circuit breaker compact in shape and occupies a small space, facilitating installation and arrangement in substations and other places.

- The three - phase is equipped with a spring operating mechanism, which is centrally arranged and the three phases are linked. The spring operating mechanism can provide reliable power for the opening and closing operations of the circuit breaker, ensuring the accurate and rapid action of the circuit breaker.

3. **Technical Parameters**: - **Rated Voltage**: Usually 72.5kV or 126kV, it is applicable to the 110KV high - voltage power system and can withstand the high voltage in the system to ensure the normal operation of the equipment.

- **Rated Current**: Depending on different application scenarios and requirements, the rated current will be different. Common specifications include 3150A, etc., which can meet the current - carrying capacity requirements of 110KV transformers.

- **Breaking Capacity**: It has strong breaking capacity and can safely and reliably cut off the fault current and the rated current, ensuring the stable operation of the power system. For example, in the event of a short - circuit fault, it can quickly open the circuit to prevent the expansion of the fault range.

4. **Performance Advantages**: - **Good Insulation Performance**: The high insulation strength of SF6 gas can effectively prevent the leakage of the arc and the influence of the external environment on the inside of the circuit breaker, ensuring the safe operation of the circuit breaker in a high - voltage environment.

- **Reliable Arc - Extinguishing Performance**: The self - energy arc - extinguishing principle enables the circuit breaker to quickly extinguish the arc when opening the circuit, reducing the erosion of the contact by the arc and improving the service life and reliability of the circuit breaker.

- **Good Frequent Operation Performance**: The mechanical structure is reasonably designed, and the operating mechanism operates flexibly, which can meet the requirements for frequent operation of the circuit breaker in the power system. For example, in the process of switching operations and troubleshooting in the system, it is necessary to frequently open and close the circuit.

- **Strong Environmental Adaptability**: It can adapt to various harsh environmental conditions, such as high - altitude, low - temperature, high - temperature, and polluted environments. In high - altitude areas, the pressure and density of SF6 gas need to be specially adjusted to ensure the normal operation of the circuit breaker; in polluted environments, the external insulation design of the circuit breaker can effectively prevent the impact of pollution on the insulation performance.

5. **Application Scenarios**: - In 110KV substations, the LW36 - 72.5 - 126 high - voltage SF6 AC circuit breaker is mainly used for the protection and control of transformers. When a transformer fails, the circuit breaker can quickly cut off the circuit to prevent the fault from causing greater damage to the transformer and the power system; during normal operation, the circuit breaker can achieve the connection and disconnection of the circuit, facilitating the dispatching and operation management of the power system.

- It can also be used in tie lines in the power system as a tie circuit breaker to achieve the connection and switching between different power lines, improving the flexibility and reliability of the power system.