33 Kv Sf6 Circuit Breaker

Item:33 Kv Sf6 Circuit Breaker

The 33kV / 36kV SF6 Circuit Breaker offersoutstanding opening performance with a pressurized gas interrupter, ensuringshort arc burning time andlong electrical lifespan.

Key Characteristics:

Porcelain Column Structure:

1. Features a discrete three-phase design.

2. Includes a pressurized gas interrupter chamber for each phase.

3. The three phases are interconnected via copper pipes for uniform gas distribution.

Main Components:

1. Pillar porcelain vase.

2. Current transformer.

3. Interrupter.

4. Adsorber.

5. Transmission box.

6. Connecting rod.

7. Bottom frame.

8. Spring-operated mechanism.

Model Description

Main Technical Parameters

Structure And Mounting Dimensions

Working Environment：

Item:33 Kv Sf6 Circuit Breaker

The 33kV / 36kV SF6 Circuit Breaker is designed to operate efficiently under the following environmental conditions:

Installation Method:

Side-mounted or middle-mounted.

Ambient Temperature:

Upper Limit: +40°C

Lower Limit: -30°C

Altitude:

Suitable for altitudes ≤2000m.

For altitudes above 2000m, the rated insulation level must be adjusted accordingly.

Wind Pressure:

Not exceeding 700Pa (equivalent to a wind speed of 34m/s).

Seismic Resistance:

Designed to withstand earthquakes of intensity up to8 degrees.

Contamination Level:

Suitable forClass I pollution levels.

Daily Temperature Difference:

Maximum variation should not exceed25°C.

Possible causes of electrical circuit failure

Item:33 Kv Sf6 Circuit Breaker

SF6 Gas Depletion or Contamination

Low SF6 Pressure: If the SF6 gas pressure drops below the required level, it can compromise the dielectric strength and interrupting capabilities of the circuit breaker.

Moisture Contamination: Presence of moisture in SF6 can degrade its insulating properties and lead to arc tracking or even internal breakdown.

Gas Leakage: Leaks in the interrupter or seals can result in loss of gas pressure, leading to failure in circuit interruption.

Mechanical Failures

Spring Mechanism Malfunction: If the spring mechanism used for operating the breaker fails, it may prevent the breaker from opening or closing properly.

Worn or Damaged Contacts: Over time, the interrupter contacts may wear down, leading to poor performance or failure to open the circuit under load.

Faulty Transmission Mechanism: Issues in the transmission box or connecting rods can hinder the breaker’s operation, leading to malfunction.

Electrical Issues

Arcing: Inadequate arc extinguishing due to poor SF6 gas pressure or contamination can cause sustained arcing, which may damage the contacts and interrupting chamber.

Short Circuit or Overload: Overloading or external faults (e.g., short circuits) can result in the breaker failing to trip or causing excessive heat and damage to the internals.

Incorrect Tripping: Failures in the tripping coil, relays, or protection circuits may prevent the breaker from detecting faults or responding correctly.

Environmental Factors

Temperature Extremes: Excessive heat or cold outside of the specified operating range can affect the performance of the breaker, particularly the gas pressure and mechanical components.

Seismic Vibrations: Excessive vibrations from nearby earthquakes can disrupt the breaker’s operation, especially if the structure is not properly mounted or secured.

Contaminant Build-up: Dust, dirt, and other environmental contaminants can accumulate, affecting the insulating properties and mechanical functionality of the breaker.

Improper Maintenance or Operation

Lack of Regular Maintenance: Failure to perform routine inspections, gas pressure checks, and mechanical testing can lead to undetected wear or faults.

Human Error: Incorrect installation, setting adjustments, or operational mistakes can lead to improper functioning of the breaker.

Product Real Shot

FAQ

Q1: What is the operating principle of a 33kV / 36kV SF6 circuit breaker?
A1: The 33kV / 36kV SF6 circuit breaker uses sulfur hexafluoride (SF6) gas as the interrupting medium. The SF6 gas provides excellent dielectric properties and arc-quenching capabilities. When a fault occurs, the breaker opens, and the gas is pressurized to extinguish the arc, ensuring efficient operation and protection of the electrical system.

Q2: What is the rated voltage of the 33kV / 36kV SF6 circuit breaker?
A2: The rated voltage of the 33kV / 36kV SF6 circuit breaker is typically 33kV or 36kV, designed for use in medium voltage power systems.

Q3: How does SF6 gas contribute to the circuit breaker's performance?
A3: SF6 gas has superior dielectric strength, which is 2-3 times that of air. It also has excellent arc-extinguishing properties, helping to quench the arc quickly when the breaker opens. This allows for more reliable and efficient protection of electrical systems under fault conditions.

Q4: What maintenance is required for the 33kV / 36kV SF6 circuit breaker?
A4: The 33kV / 36kV SF6 circuit breaker requires regular maintenance to ensure its continued functionality. Key tasks include:

· Monitoring SF6 gas pressure and ensuring no leaks.

· Checking the mechanical operation of the spring mechanism.

· Inspecting the interrupter contacts for wear.

· Cleaning and checking the external parts to ensure there are no environmental contaminants affecting performance.