Sulfur Hexafluoride Circuit Breaker Switch 126kv

The Usune LW36-110 Sulfur Hexafluoride Circuit Breaker Switch 126kV is a core device for the control and protection of 110kV transmission and transformation systems and can also be used as a tie circuit breaker and switching equipment group. The product adopts an integrated self-energized arc-extinguishing structure, with each phase as a single-support, single-break unit. All three phases are installed on the same frame, achieving mechanical linkage through a spring operating mechanism. The top of the product contains the arc-extinguishing chamber porcelain bushing, the middle section contains the support porcelain bushing and frame, and the mechanism box containing the electrical control components is suspended below the frame, resulting in a compact structure and convenient operation.

Core Advantages

1. Authoritative Compliance

Complies with Chinese standards GB1984-2003 "AC High Voltage Circuit Breakers" and IEC62271-100:2001 "High Voltage Switchgear and Controlgear—Part 100: High Voltage Circuit Breakers," and has passed rigorous factory testing and certification to ensure product compliance and reliability.

2. Superior Performance

Utilizes the "thermal expansion + assisted blowing" arc extinguishing principle, resulting in short arc extinguishing time, long electrical life, and low operating noise; uses SF6 gas with excellent insulation and arc extinguishing properties as the medium, eliminating the risk of combustion and explosion, making it suitable for densely populated areas.

3. Reliable Evidence

The spring-operated mechanism has a mechanical life of up to 6000 cycles, an annual SF6 gas leakage rate of ≤0.5%, and a main circuit resistance of ≤80μΩ. Complete technical parameters and test data verify product stability.

4. Strong Adaptability

Widely adaptable to harsh outdoor environments, with an ambient temperature range of -30℃ to +40℃ and an altitude of ≤3000 meters. Strong resistance to wind, ice, and earthquakes, meeting the needs of various power project scenarios.

Core Technical Parameters

The Sulfur Hexafluoride Circuit Breaker Switch 126kV boasts excellent electrical performance, with core parameters meeting the high standards of 126kV power equipment, ensuring stable operation in complex power systems. Key core parameters are as follows:

Product Overall Structure

The Sulfur Hexafluoride Circuit Breaker Switch 126kV consists of three phases, each equipped with a self-energized arc-extinguishing chamber, support insulation device, adsorbent, and leak-proof structure. Static sealing uses O-rings and sealant, while dynamic sealing uses spring compression sealing, ensuring excellent airtightness. The transmission part connects the single-pole circuit breaker and the operating mechanism, efficiently transmitting operating force; the spring operating mechanism has a built-in mechanism box, providing manual, electric energy storage, and reclosing functions, offering flexible and reliable operation.

Product Working Principle

1. Closing State: System current forms a circuit through terminals, stationary contacts, moving contacts, cylinders, and intermediate contacts, ensuring normal power transmission.
2. Tripping Operation: Under the action of the operating mechanism, the moving contact moves downward, generating an electric arc when the moving and stationary contacts separate; the compressed SF6 gas in the cylinder blows the arc through the nozzle, and the arc is extinguished when the current crosses zero.
3. SF6 Gas System: Equipped with an integrated SF6 density meter and controller with temperature compensation, it can monitor gas pressure in real time. When the pressure is too low, an alarm is triggered and the mechanism is locked to prevent mechanical damage.

Project Reference

Cas-space Rocket Launch Project

Test Report

Application Case

In 2024, the Usune LW36-110 Sulfur Hexafluoride Circuit Breaker Switch 126kV was successfully applied to a key 110kV transmission and transformation project in northern China. This project aimed to solve the problem of insufficient power supply capacity in rural and suburban areas. The project site has a large temperature difference (-25℃ to +38℃) and frequent sandstorms, placing extremely high demands on the environmental adaptability and reliability of the power equipment.

As the designated supplier for this project, Usune provided 28 LW36-110 circuit breakers. The factory dispatched professional technicians to provide on-site guidance for installation, commissioning, and trial operation. After eight months of stable operation, the product achieved zero failures, with the SF6 gas leakage rate far below the standard requirements (actual test ≤0.3%), and the opening and closing response speed fully met the project design standards. After the project was put into operation, it effectively improved the stability of the local power grid, reduced power outages caused by equipment failures, and received high recognition from the project owner and local power department, fully verifying the excellent environmental adaptability and reliable operation performance of the Usune 126kV SF6 circuit breaker in actual working conditions.

FAQ

Q1: What is the service life of the Usune Sulfur Hexafluoride Circuit Breaker Switch 126kV, and what are the key maintenance points?

A1: The product's mechanical life is 6000 cycles, and the recommended continuous operating life is 12 years. Key maintenance points: Weekly routine inspections (insulator integrity, SF6 gas pressure, etc.); annual maintenance every 3 years (cleaning insulators, measuring main circuit resistance, etc.); when the product reaches the maintenance conditions (e.g., 20 full-capacity short-circuit breaks), the arc contacts, adsorbent, and sealing rings need to be replaced. The manufacturer will send professional personnel to provide on-site guidance for maintenance.

Q2: Can the Usune LW36-110 circuit breaker be used in high-altitude and frigid regions? What is the maximum suitable altitude?

A2: Yes. This product is specifically designed for harsh outdoor environments, with strong adaptability to high altitudes and low temperatures. It is suitable for altitudes up to 3000 meters and can withstand temperatures as low as -30℃, fully meeting the needs of high-altitude and frigid regions such as western China. Furthermore, the mechanism box has a built-in heater, providing moisture and freeze protection during rain, snow, and severe cold seasons, ensuring stable operation.

Supplier and After-Sales Service

Zhejiang Usune Electric Co., Ltd., as a professional manufacturer of high-voltage power equipment in China, possesses a complete production line and a strict quality control system. The factory is equipped with advanced testing equipment, and each product undergoes vacuuming, gas filling, and mechanical performance testing before leaving the factory to ensure product quality. As a reliable supplier, Usune provides one-stop after-sales service, including on-site installation guidance, commissioning, maintenance training, and spare parts supply. A professional technical team responds promptly to user needs, ensuring long-term stable operation of the equipment.