66KV Tank Type SF6 Circuit Breaker

The 66KV Tank Type SF6 Circuit Breaker (Model: LW36-66) is a high-voltage outdoor circuit breaker designed for 66KV power transmission and distribution systems with a rated frequency of 50Hz AC. Utilizing SF6 gas as both the insulating and arc-extinguishing medium, it provides reliable switching, fault interruption, and protection for substations, utility power grids, industrial facilities, and renewable energy projects. The circuit breaker can also be used as a bus tie breaker and for capacitor bank switching applications.

Designed with a compact live-tank structure, the LW36-66 minimizes installation space while delivering outstanding electrical performance and long-term operational reliability. Its advanced spring operating mechanism, low SF6 leakage rate, and maintenance-friendly design make it an ideal solution for modern high-voltage transmission networks requiring safe, efficient, and stable operation.

Actual Product Photo

Product Dimensions Diagram

Main Structure

• Silver-plated aluminum single-phase terminal block for excellent electrical conductivity.
• High-strength porcelain outgoing bushing with superior insulation performance.
• Built-in current transformer (CT) for protection and measurement.
• Floor-mounted SF6 arc extinguishing chamber with high interrupting capability.
• Mechanism cabinet integrating the spring operating mechanism and secondary control components.
• Heavy-duty galvanized channel steel support for stable installation.
• Multiple grounding terminals for improved operational safety.

Product Features

• Rated current up to 3150A, suitable for heavy-load transmission applications.
• Advanced SF6 gas insulation technology ensures excellent dielectric strength and reliable arc extinction.
• Long electrical endurance with 31.5kA fault interruption capability and up to 10,000 mechanical operations.
• Annual SF6 gas leakage rate below 0.5%, reducing maintenance requirements and ensuring long-term sealing reliability.
• The 66KV Tank Type SF6 Circuit Breaker is designed for severe outdoor environments, supporting Pollution Level IV and ambient temperatures from -40°C to +40°C.
• Compact tank-type construction reduces installation space while improving mechanical stability.
• Suitable for remote monitoring, substation automation, and modern smart grid applications.

Technical Specifications

Operating Mechanism Specifications

Applications

The 66KV Tank Type SF6 Circuit Breaker is widely used in high-voltage power transmission and distribution systems where reliable switching and protection are essential.

• 66KV substations
• Utility transmission and distribution networks
• Power generation plants
• Renewable energy grid integration
• Industrial power distribution systems
• Capacitor bank switching
• Bus tie and feeder protection
• Smart grid and substation automation projects

Working Principle

The 66KV Tank Type SF6 Circuit Breaker uses sulfur hexafluoride (SF6) gas as both the insulating and arc-quenching medium. When the contacts separate during a switching operation, an electric arc is generated. High-pressure SF6 gas rapidly cools and deionizes the arc, allowing the fault current to be interrupted safely and efficiently. The motor-charged spring operating mechanism provides fast opening and closing operations, ensuring reliable protection for high-voltage electrical systems.

Frequently Asked Questions

What is a 66KV Tank Type SF6 Circuit Breaker used for?

It is used for switching, protection, and fault interruption in 66KV transmission and distribution systems, helping maintain the safe and reliable operation of substations and power grids.

What are the advantages of an SF6 tank type circuit breaker?

SF6 tank type circuit breakers offer excellent insulation performance, high interrupting capacity, compact structure, low maintenance requirements, and long mechanical service life.

Can this circuit breaker be used for capacitor bank switching?

Yes. The LW36-66 is suitable for capacitor bank switching, bus tie applications, and high-voltage transmission line protection.

Is the circuit breaker suitable for harsh outdoor environments?

Yes. It is designed to operate reliably under Pollution Level IV conditions and ambient temperatures ranging from -40°C to +40°C, making it suitable for demanding outdoor installations.