High Voltage Circuit Breaker Switch For Substation

The Usune LW36-110 High Voltage Circuit Breaker Switch for Substation is a core power equipment independently developed and manufactured by Zhejiang Usune Electric Co., Ltd., a leading manufacturer in China's high-voltage switchgear industry. This three-phase AC 50Hz outdoor high-voltage switchgear is primarily used for the control and protection of 110kV power transmission and transformation systems, and can also be used as a contact circuit breaker and in applications requiring switchgear assemblies. Products are manufactured in Usune's professional factory, integrating R&D, production, and testing, ensuring that every product meets stringent quality standards before leaving the factory.

Core Compliance and Authority

To guarantee product reliability and compatibility, the Usune LW36-110 High Voltage Circuit Breaker Switch for Substation fully complies with GB1984-2003 "AC High Voltage Circuit Breakers" standard and meets the requirements of International Electrotechnical Commission (IEC) standard IEC62271-100:2001 "High Voltage Switchgear and Controlgear - Part 100: High Voltage Circuit Breakers". As a professional supplier, Usune has passed rigorous quality system certification, and its factory is equipped with advanced production and testing equipment to ensure that the performance of each product meets or exceeds industry standards.

Core Technical Features

1. Advanced Arc Extinguishing Principle

Utilizing a unique "thermal expansion + auxiliary" arc extinguishing principle, it boasts excellent breaking performance, short arc time, long electrical life, and low operating noise, effectively ensuring the safety of power grid operation.

2. Safe Insulating Medium

Utilizes SF6 gas with excellent insulation and arc-extinguishing properties as the insulating and arc-extinguishing medium, posing no risk of combustion or explosion, making it suitable for densely populated areas and various complex substation environments.

3. Reliable Operating Mechanism

Equipped with a CTB-1 type spring operating mechanism, featuring a simple and compact structure, stable operation, high safety and reliability, and reduced maintenance and failure frequency.

4. Strong Environmental Adaptability

Can operate stably in harsh environments, strictly complying with various environmental indicators, ensuring long-term stable operation in different regions.

Key Technical Parameters

1. Rated Voltage: 110kV; Rated Frequency: 50Hz; Rated Current: 3150A
2. Rated Short-Circuit Breaking Current: 40kA; Rated Short-Circuit Making Current (Peak): 100kA
3. Rated SF6 Gas Pressure (20℃): 0.5MPa; Annual Leakage Rate: ≤0.5%
4. Mechanical Life: 6000 cycles; Opening Time: ≤60ms; Closing Time: ≤145ms
5. Ambient Temperature Range: -30℃～+40℃; Altitude: ≤3000m

Product Overall Structure

The High Voltage Circuit Breaker Switch For Substation adopts a self-energized arc-extinguishing chamber integrated structure, with each phase being a single-pillar single-break (POLE). Each circuit breaker consists of three phases, installed on the same frame, operated by a spring mechanism, with three phases mechanically linked. The top of the product features an arc-extinguishing chamber porcelain bushing, the middle section contains a support porcelain bushing and frame, and the mechanism box is located in the middle and suspended below the frame. It houses the internal spring operating mechanism and electrical control components. The mechanism output pull rod connects to the connecting rod and rotating arm. The SF6 gas density controller is installed on the front of the frame, which is supported at both ends by supports.

Working Principle

1. Closing Position

System current flows through the terminals, stationary contact support rod, stationary main contact, moving main contact, cylinder, intermediate contact, and intermediate flange, then forms a circuit with the system through the terminals.

2. Opening Operation

Under the action of the actuator, the operating arm pulls the insulating pull rod, piston rod, cylinder, moving arc contact, and nozzle downwards together. An arc is generated when the moving and stationary contacts separate. When the moving contact system moves downwards to a certain position, the nozzle opens, and compressed SF6 gas in the cylinder is blown into the arc area through the nozzle. The arc is extinguished when the current crosses zero.

3. Closing Operation

Under the action of the actuator, the operating arm pulls the moving contact connected to the insulated rod upward to the closing position. Simultaneously, SF6 gas enters the cylinder, preparing for the next opening operation.

Key System Introduction

1. SF6 Gas System

Composed of an SF6 density meter (pressure gauge and density controller integrated), gas supply valve, three-phase valves, and SF6 gas pipeline. It features temperature compensation, alarm and interlocking pressure protection to ensure stable SF6 gas pressure.

2. Control System

Located within the mechanism housing, it includes key components such as operating switches, automatic switches, trip switches, relays, terminals, closing coils, motors, and heaters. It enables switch control, anti-pumping, spring energy storage, SF6 gas pressure protection, heating, and lighting functions.

Project Reference

Cas-space Rocket Launch Project

Test Report

Practical Application Case

To verify the reliability and practicality of the Usune LW36-110 High Voltage Circuit Breaker Switch For Substation, this product has been successfully applied to a 110kV substation project in a key industrial park in East China. As a trusted supplier, Usune provided 12 LW36-110 circuit breakers for this project, which have been operating stably for over three years.

This substation supplies power to more than 50 large and medium-sized enterprises within the industrial park, requiring extremely high stability and safety. In the early stages of the project, the client comprehensively compared several Chinese manufacturers, ultimately selecting Usune's LW36-110 circuit breakers due to their superior technical performance, rigorous quality control, and comprehensive after-sales service. During operation, the products successfully withstood extreme weather conditions including high temperatures, heavy rain, and low temperatures without any recorded malfunctions. The SF6 gas leakage rate was far below the standard requirement (≤0.5%), mechanical operation was smooth, and opening and closing times were stable, effectively ensuring the safe and stable operation of the park's power grid. This earned high praise from the client, and Usune became the designated power equipment supplier for the park's subsequent expansion projects.

FAQ

Q1: What is the service life of the Usune LW36-110 high-voltage circuit breaker, and what are the key maintenance points?

A1: The product has a mechanical life of 6000 cycles, and under normal use and regular maintenance, its continuous operating life can reach 12 years. Key maintenance points include: weekly routine inspections (checking insulator integrity, SF6 gas pressure, and operating status); annual overhauls every 3 years (cleaning insulators, checking fasteners, measuring main circuit resistance, and SF6 gas moisture content); major overhauls are required under the following conditions: 12 years of continuous operation, 2000 rated current interruptions, 20 full-capacity (40kA) interruptions, or 6000 mechanical operations. Usune provides professional maintenance guidance and spare parts supply to ensure long-term stable operation of the product.

Q2: Can the Usune LW36-110 High Voltage Circuit Breaker Switch For Substation be used in high-altitude and extremely cold regions? How is its environmental adaptability?

A2: Yes, this product has strong environmental adaptability and can be used in high-altitude and extremely cold regions. Its ambient temperature range is -30℃ to +40℃, with a maximum adaptable altitude of ≤3000m. It can withstand 700Pa wind pressure and 10mm icing, and its seismic strength meets the requirements of horizontal acceleration ≤0.3g and vertical acceleration ≤0.15g. It is also suitable for areas with daily average relative humidity ≤95% and monthly average relative humidity ≤90% (25℃), and can be used in environments free from flammable, explosive, chemically corrosive, and severe vibration conditions, fully meeting the environmental requirements of most substation projects in China and even globally.

Supplier and Factory Introduction

Zhejiang Usune Electric Co., Ltd. is a professional manufacturer and supplier of high-voltage power switchgear in China, focusing on the research, development, production, sales, and after-sales service of high-voltage circuit breakers, switches, and other power equipment. The company's factory is located in Zhejiang Province, China, covering an area of over 10,000 square meters, equipped with advanced production lines, testing equipment, and a professional R&D team.

Usune adheres to the philosophy of "Quality First, Customer Supreme," strictly implementing a quality control system during the production process. All products undergo rigorous testing before leaving the factory. As a trusted supplier, Usune has provided high-quality power equipment for hundreds of substation projects both domestically and internationally, winning widespread customer recognition for its reliable product quality and comprehensive after-sales service.