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SF6 high-voltage circuit breaker polytetrafluoroethylene composite material nozzle and preparation method thereof

A technology of polytetrafluoroethylene and high-voltage circuit breakers, which is applied in the field of high-voltage circuit breaker nozzles, can solve problems such as rough surface and turbulent flow of arc extinguishing gas, and achieve the effect of prolonging service life and slowing down ablation.

Active Publication Date: 2012-10-17
CHINA XD ELECTRIC CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

Therefore, short-wave ultraviolet rays still have a certain penetration ability to the nozzle of PTFE-BN composite material, so the surface of the nozzle throat of the material after the high-current arc will be ablated with dense pits, and the surface becomes rough and uneven. Can cause turbulent flow of arc extinguishing gas

Method used

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  • SF6 high-voltage circuit breaker polytetrafluoroethylene composite material nozzle and preparation method thereof
  • SF6 high-voltage circuit breaker polytetrafluoroethylene composite material nozzle and preparation method thereof

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Embodiment Construction

[0022] The arc ablation resistant SF of the present invention 6 A preparation method for a polytetrafluoroethylene composite spout of a high-voltage circuit breaker (see Table 2 for examples 1 to 4), comprising the following steps:

[0023] First, the PTFE powder with a particle size of 5-20 μm is mixed evenly with the BN powder with a particle size of 1-10 μm in a certain proportion, and then the above mixture is mixed with the MoS powder with a particle size of 1-10 μm. 2 Mix evenly; the amount of BN added is controlled in PTFE powder, BN powder and MoS 2 1~8% of the total mass of powder; MoS 2 The amount of addition is controlled in PTFE powder, BN powder and MoS 2 The total mass of the powder is 0.1-0.4%, and the final mixture is molded and sintered to make a nozzle blank (the molding and sintering process is the same as the process for preparing a BN-PTFE composite nozzle in the prior art).

[0024] Table 2: Examples 1-4 (ingredient ratio by mass percentage)

[0025] ...

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Abstract

The invention provides an SF6 high-voltage circuit breaker polytetrafluoroethylene composite material nozzle which is composed of the components of, by mass, 1-8% of boron nitride (BN), 0.1-0.4% of molybdenum disulfide (MoS2), and balance of polytetrafluoroethylene (PTFE). According to the invention, MoS2, BN, and PTFE are compounded for preparing a nozzle which can resist high voltage and large current arc ablation. When the nozzle composed of the composition is in use, during a thermal cracking process controlled by heat, the BN component can reduce the decomposition speed of PTFE. When PTFE is decomposed due to arc ultraviolet light, the filling material containing MoS2, short-wave ultraviolet can be blocked and absorbed, such that the ablation of the composite material and local micro-damage on the surface of a nozzle throat can be retarded. The nozzle is suitable to be used in extra-high-voltage circuit breaker products and ultra-high-voltage circuit breaker products. With the material, the service life of the nozzle, which is a core component, can be prolonged.

Description

【Technical field】 [0001] The invention relates to the technical field of ultra-high voltage and ultra-high voltage circuit breakers, in particular to an arc-resistant high-voltage circuit breaker spout. 【Background technique】 [0002] The high-voltage circuit breaker spout made of polytetrafluoroethylene (PTFE) is a key component of the high-voltage circuit breaker interrupter, SF 6 The nozzle of the arc extinguishing chamber of the circuit breaker controls the flow of the arc blowing gas during the breaking process, and it directly affects the SF in the nozzle during the breaking process. 6 The recovery characteristics of the dielectric strength of the gas and the arc quenching ability. The service life of the high voltage circuit breaker depends on the degree of arc ablation of the nozzle during use, which is one of the main factors related to the service life of the circuit breaker. [0003] Since the material begins to decompose significantly above 400°C, and the arc t...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08K3/38C08K3/30
Inventor 吴雪峰
Owner CHINA XD ELECTRIC CO LTD
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