LW8-40.5AG SF6 Circuit Breaker

Item:LW8A-40.5 SF6 Circuit Breaker

·  Structure: Each pole is designed with asingle-column single-fracture structure.

·  Arc Extinguishing: Utilizes the principle ofself-energy arc extinguishing for efficient performance.

·  Actuation: Equipped with aCT14 spring actuator, allowing for reliable operation.

·  Mechanical Linkage: Incorporates athree-phase mechanical linkage, ensuring synchronized performance across all phases.

·  Compliance: This circuit breaker meets the requirements of theGB1984 andIEC62271-100 standards for high-voltage equipment.

Model Description

Main Technical Parameters

Structure And Mounting Dimensions

Working Environment：

Item:LW8A-40.5 SF6 Circuit Breaker

Ambient Temperature:

Upper limit: +40°C

Lower limit: -30°C

Altitude:

≤2000 meters above sea level

If installed at higher altitudes, adjustments to the insulation level may be necessary.

Wind Pressure:

≤700 Pa (equivalent to wind speeds of up to 34 m/s).

Seismic Conditions:

The circuit breaker is designed to withstandearthquake intensity ofup to 8 degrees.

Contamination Level:

Class I, indicating it is suitable for normal environmental pollution levels.

Temperature Fluctuations:

Maximum daily temperature difference: No more than25°C.

Possible causes of electrical circuit failure

Item:LW8A-40.5 SF6 Circuit Breaker

1.Faults in the SF6 Gas Insulation

· SF6 Gas Leakage: SF6 (sulfur hexafluoride) gas is used to insulate the circuit breaker contacts. Any leakage or deterioration of the gas can reduce its insulating properties, leading to breakdowns in performance and possible failure to interrupt fault currents.

· Insufficient Gas Pressure: Low gas pressure can cause improper operation of the breaker, as SF6 gas is integral to quenching the arc during a fault.

2.Mechanical Failures

· Spring Mechanism Malfunction: The breaker operates through a spring mechanism, which stores energy for opening and closing. A malfunction in the spring or the actuator mechanism can prevent proper operation, leading to a failure to open or close the breaker.

· Contact Wear or Damage: Over time, the breaker’s contacts can wear down, become pitted, or suffer mechanical damage, compromising its ability to make or break the circuit as needed.

3.Electrical Faults

· Overcurrent or Short Circuits: An overload or short circuit beyond the breaker's interrupting capacity can cause overheating or damage to the breaker’s internal components.

· Incorrect Trip Settings: If the trip settings are misconfigured or the protection relay fails to operate correctly, the breaker may not trip in the event of an overcurrent or fault.

4.Arc Faults

Arc Extinguishing Failure: SF6 circuit breakers rely on the arc quenching properties of the SF6 gas. If the breaker fails to extinguish the electrical arc correctly (due to gas pressure issues or contamination), this can lead to persistent arcs, damaging the breaker and the surrounding equipment.

Product Real Shot

FAQ

Item:LW8A-40.5 SF6 Circuit Breaker

1.What is the LW8A-40.5 SF6 Circuit Breaker?

Answer: The LW8A-40.5 SF6 Circuit Breaker is a high-voltage circuit breaker rated for 40.5 kV, typically used in electrical substations and power systems. It utilizes SF6 gas for insulating and arc-quenching purposes, ensuring reliable operation in high-voltage environments.

2.What are the main features of the LW8A-40.5 SF6 Circuit Breaker?

Answer:

Rated voltage: 40.5 kV

SF6 gas insulation and arc quenching

High breaking capacity, suitable for interrupting fault currents

Fast operating mechanism for quick fault clearance

Suitable for outdoor and indoor applications

Compact design for easy installation

3.How does the LW8A-40.5 SF6 Circuit Breaker work?

Answer: The breaker works by using SF6 gas to extinguish the arc formed when contacts open during a fault. When a fault is detected, the circuit breaker’s control system activates the spring mechanism, forcing the contacts to separate. The SF6 gas absorbs the energy from the arc and cools it, ensuring that the circuit is safely interrupted.