Item:66kv 69kv Sf6 Circuit Breaker

Efficient Arc Extinguishing with SF6 Gas:

SF6 gas serves as the interrupting medium, offering excellent arc extinguishing properties.

The gas also provides superior electrical insulation and is compressed during operation to effectively extinguish arcs, making it an ideal switch for capacitor and reactor groups.

Superior Breaking Performance:

Capable of reliably breaking various abnormal short circuits, such as reverse-phase faults, simultaneous grounding at both poles, near-zone faults, and breaker end faults.

Low Operating Noise:

The sealed design isolates the breaker from atmospheric conditions, eliminating gas discharge noise during operation.

Compact and Simple Structure:

Features a single-break arc chamber with no additional valve systems, resulting in a compact and straightforward design.

Minimal Maintenance Requirements:

The interrupter contacts, housed in SF6 gas, experience minimal wear during operation, leading to reduced maintenance workload and extended maintenance cycles.

Safe and Reliable Operation:

SF6 gas is non-toxic and non-combustible. The interrupter chamber’s excellent sealing ensures safe and reliable long-term use.

Model Description

Main Technical Parameters

Structure And Mounting Dimensions

Working Environment：

Item:66kv 69kv Sf6 Circuit Breaker

Installation Method:

 Side-mounted or middle-mounted.

Ambient Temperature:

Maximum: +40°C

Minimum: -30°C

Altitude:

≤2000m (If installed at higher altitudes, the rated insulation level should be adjusted accordingly).

Wind Pressure:

≤700Pa (equivalent to a wind speed of 34m/s).

Seismic Resistance:

Designed to withstand an earthquake intensity of up to 8 degrees.

Contamination Level:

Class I

Maximum Daily Temperature Variation:

Not exceeding 25°C

Possible causes of electrical circuit failure

Item:66kv 69kv Sf6 Circuit Breaker

● Control Circuit Issues

● Disconnected control circuit or no control power (e.g., blown fuse, faulty power supply, or damaged control components).

● Incorrect or poor connections in the auxiliary or trip coil circuit.

● Pressure Abnormalities

● Insufficient SF6 gas pressure resulting in inadequate insulation or arc-extinguishing performance.

● High moisture content in the SF6 gas, leading to insulation degradation and potential short circuits.

Mechanical Failures

Jammed operating mechanism due to lack of lubrication, wear, or mechanical obstructions.

Improper alignment or malfunction of the interrupter contacts.

Overload or Fault Conditions

Persistent overloads or short-circuit conditions in the network triggering automatic tripping.

Tripped breaker due to faulty load conditions or system faults.

Environmental Influences

High contamination or corrosive environments causing contact erosion or insulation weakening.

Extreme temperature variations affecting the mechanical and insulating properties.

Incorrect Operation

Manual operation errors, such as improper switching sequences or insufficient reset after tripping.

Accidental closing of the circuit breaker under fault conditions.

Aging or Wear

Gradual degradation of components, such as springs, bearings, or contact points, over time.

Outdated or incompatible components leading to operational inefficiencies.

Electrical Component Failures

Malfunctioning relays, sensors, or pressure gauges disrupting breaker control and monitoring.

Burnt or damaged operating coils due to excessive voltage or prolonged activation.

Product Real Shot

FAQ

Item:66kv 69kv Sf6 Circuit Breaker

Q1: What is the rated voltage of the 66kV SF6 circuit breaker?

A1: The rated voltage of the 66kV SF6 circuit breaker is 66kV, suitable for high-voltage power systems.

Q2: What gas is used in the circuit breaker, and why?

A2: SF6 gas (sulfur hexafluoride) is used because it has excellent arc-extinguishing and insulating properties. It ensures efficient performance and reliability in high-voltage applications.

Q3: Can the breaker operate under extreme environmental conditions?

A3: Yes, the breaker is designed to operate in harsh environments with temperatures between -30°C and +40°C, altitudes up to 2000m, and seismic intensity up to 8 degrees. For altitudes above 2000m, special adjustments to the insulation level are required.

Q4: How often does the SF6 circuit breaker need maintenance?

A4: Due to its simple structure and sealed design, the circuit breaker requires minimal maintenance. Regular inspections of gas pressure, electrical components, and mechanical parts are recommended.