Description

The 145kV/170KV dead tank SF6 circuit breaker is a high-reliability high-voltage device designed to ensure stable operation of power systems. It adopts a dead tank structure, with live parts sealed in a metal casing filled with SF6 gas, ensuring rapid arc extinction and efficient fault current interruption to safeguard grid safety. The low-center-of-gravity design gives it strong seismic resistance, adapting to harsh environments such as extreme climates. The equipment integrates bushings and current transformers to support multi-functional control such as measurement and protection. With long mechanical/electrical life and a sealed structure, maintenance frequency is significantly reduced. Equipped with anti-misoperation interlocking devices, it ensures the safety of personnel and equipment. Widely used in power, metallurgy, transportation and other fields, it performs excellently in medium and high voltage scenarios.

Product Advantages

• The spring operating mechanism of the circuit breaker is safe and stable, maintenance-free, and highly reliable, and meets the requirements of oil-free and gas-free operating mechanism.

• Self-energy-compressed combined arc extinguisher.

• The equipment is shipped after the lightning impact test, which eliminates the hidden danger of insulation discharge caused by production and assembly, and ensures the stable and reliable product quality.

• The quality of the insulators is stable and reliable.

• High parameterization: The technical parameters of the products are all of the highest standards in the industry.

• The domestic first-class design team, suppliers and internal control system ensure the safety, stability and reliability of the products, and the products and inspection standards manufactured in the factory have been recognized by the State Grid and the Southern Power Grid Supervision.

• Using advanced R&D tools such as finite element analysis software, functional analysis, whole-process quality characteristic chain, size chain analysis, potential failure mode and effect analysis (FEMA), etc., the modular design is realized on the basis of ensuring the safety, stability and reliability of product performance.

• Earthquake resistance of magnitude 9.

Product features:

• Spring operating mechanism, reliable performance;

• Excellent breaking performance

• E2-M2-C2 circuit breaker, electrical life 20 times, mechanical life 10000 times.

• Strong rated flow capacity;

• Excellent insulation level, small local discharge;

• Excellent corrosion resistance;

• Advanced design tools;

• Strict process assembly and quality control.

System Architecture

The gas-insulated metal composite combined electrical appliance (HGIS) is composed of several standard functional modules, such as circuit breaker GCB (single and double busbars), isolation-grounding switch TPS, voltage transformer PT, current transformer CT, etc. These modules have the same interface form and size. Various modules can be combined to meet the design and layout requirements of various substations.

Single-busbar single-isolation scheme

Single-busbar double -isolation scheme

Main characteristics

Electrical

Mechanical

 Use of the environment

• Installation location: indoor/outdoor;

• Ambient air temperature :

• Maximum temperature: +55℃

• Minimum temperature: -40℃; Maximum daily temperature difference: 32 K;

• Altitude: ≦3000m;

• Sunshine intensity (noon on sunny day): 1000 W/㎡;

• Pollution level: III./IV. grade;

• Icing thickness: 10mm/20mm;

• Wind speed/wind pressure: 34m/s (equivalent to 700Pa on the surface of the cylinder);

• Humidity: average daily relative humidity: ≦95%; Monthly average relative humidity: ≦90%;

• Earthquake resistance: nine degrees;

• Horizontal acceleration: 0.3g;

• Vertical acceleration: 0.15g.

Use of the product

In densely populated areas, in harmony with existing buildings, in important and critical substations, in confined space substation expansions, in flexible retrofits and replacements, in places with heavy loads, for economical and reliable energy management, in power stations, etc.