126kV-550kV PTFE nozzle
Key attributes
| Brand | Switchgear parts |
| Model NO. | 126kV-550kV PTFE nozzle |
| Rated voltage | 126-550kV |
| Series | RN |
Product descriptions from the supplier
The 126kV-550kV polytetrafluoroethylene (PTFE) nozzle is a key component of the arc extinguishing chamber of high-voltage circuit breakers (such as LW30-126, LW36-126, etc.), and its performance directly affects the breaking capacity and service life of the circuit breaker. The following is a comprehensive technical analysis:
1、 Core performance requirements
Electrical and Thermal Stability
126kV nozzle needs to withstand 550kV lightning impulse voltage, 252kV nozzle needs to meet 950kV impulse voltage, and surface electric field strength ≤ 15kV/mm
Long term working temperature needs to adapt to -200 ℃~260 ℃, and short-term high temperature resistance up to 300 ℃ (such as LW36-126 circuit breaker nozzle)
Mechanical and erosion resistance
It needs to withstand a 50kA short-circuit current impact, with a nozzle inner wall ablation depth of ≤ 0.1mm/time
By using imported PTFE with trace components such as graphite and carbon fiber, the erosion resistance is improved by more than 30%
2、 Materials and processes
Forming process
Adopting the molding sintering process, the sintering temperature is 360 ℃~380 ℃, the pressure is ≥ 10MPa, and the density is ensured to be ≥ 2.15g/cm ³
Surface enhanced bonding strength with metal flanges through plasma treatment or chemical etching
3、 Typical Applications and Standards
Application scenarios
126kV nozzle is used for urban substation circuit breakers (such as LW30-126/3150-40 models)
Industry standards
Must comply with GB/T 11022-2020 "Common Technical Requirements for High Voltage Switchgear and Control Equipment Standards"
The breaking performance test requires passing 100 full capacity short-circuit current tests (such as 40kA/3s)
4、 Technological Challenges and Development
Anti erosion optimization
Reduce arc erosion rate through gradient material design (such as PTFE outer layer+silicon carbide inner layer)
Note: Customization with drawings is available
Related Products
Related Knowledges
-
How Does Oil Loss Affect SF6 Relay Performance?1.SF6 Electrical Equipment and the Common Problem of Oil Leakage in SF6 Density RelaysSF6 electrical equipment is now widely used in power utilities and industrial enterprises, significantly advancing the development of the power industry. The arc-quenching and insulating medium in such equipment is sulfur hexafluoride (SF6) gas, which must not leak. Any leakage compromises the reliable and safe operation of the equipment, making it essential to monitor the SF6 gas density. Currently, mechanicalFelix Spark10/21/2025 -
MVDC: Future of Efficient, Sustainable Power GridsThe Global Energy Landscape Is Undergoing a Fundamental Transformation toward a "fully electrified society," characterized by widespread carbon-neutral energy and the electrification of industry, transportation, and residential loads.In today’s context of high copper prices, critical mineral conflicts, and congested AC power grids, Medium-Voltage Direct Current (MVDC) systems can overcome many limitations of traditional AC networks. MVDC significantly enhances transmission capacity and efficiencEdwiin10/21/2025 -
Grounding Causes of Cable Lines and the Principles of Incident HandlingOur 220 kV substation is located far from the urban center in a remote area, surrounded primarily by industrial zones such as Lanshan, Hebin, and Tasha Industrial Parks. Major high-load consumers in these zones—including silicon carbide, ferroalloy, and calcium carbide plants—account for approximately 83.87% of our bureau’s total load. The substation operates at voltage levels of 220 kV, 110 kV, and 35 kV.The 35 kV low-voltage side mainly supplies feeders to ferroalloy and silicon carbide plantsFelix Spark10/21/2025 -
Overhead Power Lines & Towers: Types, Design & SafetyBesides ultra-high voltage AC substations, what we encounter more frequently are power transmission and distribution lines. Tall towers carry conductors that leap across mountains and seas, stretching into the distance before reaching cities and villages. This is also an interesting topic—today, let's explore transmission lines and their supporting towers.Power Transmission and DistributionFirst, let’s understand how electricity is delivered. The electric power industry primarily consists of fouEncyclopedia10/21/2025 -
Automatic Reclosing Modes: Single, Three-Phase & CompositeGeneral Overview of Automatic Reclosing ModesTypically, automatic reclosing devices are categorized into four modes: single-phase reclosing, three-phase reclosing, composite reclosing, and disabled reclosing. The appropriate mode can be selected based on load requirements and system conditions.1. Single-Phase ReclosingMost 110kV and higher transmission lines employ three-phase single-shot reclosing. According to operational experience, over 70% of short-circuit faults in high-voltage overhead liEdwiin10/21/2025 -
How to Install MPP Pipes Without Excavation: Full GuideI. Management Regulations for Trenchless Construction of MPP Power ConduitsIn power engineering, cable installation often employs trenchless techniques such as "pulling pipe" or "pipe jacking" due to routing constraints, construction schedules, and other objective factors. While trenchless methods offer advantages like minimal traffic disruption and shorter construction periods, they also present safety and management challenges. This is because trenchless technology remains relatively new for pEncyclopedia10/21/2025
