Graphite composite resistance-reduction cloth production process

Abstract

The invention belongs to the technical field of lightning protection and grounding for electric power, railways, telecommunications, factories and mines, high-rise buildings and the like, and particularly relates to a graphite composite resistance-reduction cloth production process. The graphite composite resistance-reduction cloth production process comprises the following steps that expansible graphite with the carbon content being 99.5 percent or more is selected and high-temperature expansion is conducted at 1000 DEG C, so that graphite worms are obtained; the surface of special fiber is evenly immersed with an adhesive; the special fiber is evenly laid between an upper layer of electricity-conducting low-resistance graphite coiled material and a lower layer of electricity-conducting low-resistance graphite coiled material; the composite electricity-conducting low-resistance graphite coiled materials are cut into electricity-conducting low-resistance graphite belts; the electricity-conducting low-resistance graphite belts are made into electricity-conducting low-resistance graphite yarn through a twisting machine in a unidirectional twisting mode; the graphite composite resistance-reduction cloth is woven by a braiding machine through the electricity-conducting low-resistance graphite yarn formed in a twisted mode. The graphite composite resistance-reduction cloth production process is simple, controllable in production cost and capable of bringing convenience to large-scale production, application and popularization.

Description

technical field [0001] The invention belongs to the technical fields of lightning protection and grounding of electric power, railways, telecommunications, factories and mines, high-rise buildings, etc., and specifically relates to a production process of graphite composite resistance-reducing cloth. Background technique [0002] The grounding device of electrical equipment is an important facility to ensure the safe and stable operation of the equipment and the personal safety of the operating staff. Low grounding resistance is an important operating index to measure the grounding device, and it is also a reliable guarantee for lightning protection of electrical equipment, insulation protection of equipment, and reduction of contact voltage and step voltage. For some areas with high soil resistivity, the grounding resistance value of the grounding grid has been higher than the standard limit value for a long time, which has caused considerable hidden dangers to the safe and...

AI Technical Summary

Problems solved by technology

For some areas with high soil resistivity, the grounding resistance value of the grounding grid has been higher than the standard limit value for a long time, which has caused a lot of hidden dangers to the safe and stable operation of electrical equipment and the personal safety of operators

Therefore, the resistance reducing agent emerged as an auxiliary grounding material, and it does have a certain resistance reducing effect in the actual grounding project. There are still following deficiencies: (1) corroded metal grounding body

Some soluble chemical drag reducers and fluid drag reducers mostly contain inorganic salt components, which are often lost due to rain erosion, infiltration and groundwater flow, and the resistance reduction effect is unstable. After a period of time, the grounding resistance of the grounding grid increases and drops Resist also loses its use effect

(3) Pollution of the soil environment

(4) Construction problems

Some powders and liquid drag reducers need to be stirred during use, and a large amount of dust will inevitably endanger the upper respiratory tract health of construction workers during the construction process.

In addition, it is difficult to lay the resistance reducing agent evenly during construction, so that chemical primary batteries are formed between different parts of the metal grounding body, which further aggravates the corrosion of the metal grounding body, which requires construction personnel to have certain construction experience and try their best to To achieve uniform laying, the construction technology also directly affects the drag-reducing effect of the drag-reducing agent

(5) Cost of drag reducing agent

Although the current resistance reducing agents are of different quality and the effect of reducing resistance varies greatly, the cost is high. In addition, the amount of resistance reducing agents is generally used in a large amount, and the high cost of use is also one of the reasons that restricts its wide-scale use in grounding grid construction. one