Nonlinear conductance composite material, its preparation method and application, and lightning arrester
A composite material, lightning arrester technology, applied in the direction of resistors, overvoltage protection resistors, non-adjustable metal resistors, etc., to achieve the effect of solving the uneven distribution of the electric field in space and alleviating the deterioration problem
Active Publication Date: 2021-07-09
HUBEI UNIV OF TECH +1
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Problems solved by technology
[0004] In view of the above technical problems, the present invention provides a nonlinear conductance composite material and its preparation method and application as well as a lightning arrester, and obtains a nonlinear conductance composite material whose conductivity parameter changes adaptively with the strength of the space field, and alleviates the external insulation of the arrester. Material degradation due to uneven field strength
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[0019] The present invention will be further described below in combination with specific embodiments.
[0020] Using zinc oxide varistor powder and liquid silicone rubber as raw materials, according to the mass fraction, that is, the zinc oxide varistor powder accounts for 50%-70% of the mass fraction of the entire compound, and the zinc oxide varistor powder is based on ZnO as the main body, with a certain trace amount of Ni 2 o 3 、 Bi 2 o 3 , MnCO 3 、Cr 2 o 3 , MnO2, Co 2 o 3 , Sb 2 o 3 . The steps of preparation are as follows:
[0021] 1) Sintering: The ZnO pressure-sensitive powder is placed in a muffle furnace for sintering at the temperature setting shown in Table 1.
[0022] Table 1 Temperature rise settings
[0023]
[0024] 2) Grinding and sieving: Use an agate grinder to grind the sintered ZnO pressure-sensitive powder, and then sieve it with a 200-mesh and 280-mesh sieve to obtain a ZnO pressure-sensitive powder with a uniform particle size of 75-5...
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Abstract
The invention relates to the technical field of insulating materials, in particular to a nonlinear conductance composite material and its preparation method and application as well as a lightning arrester. Zinc oxide varistor powder is sintered in a muffle furnace, ground and sieved to obtain 75-55 Zinc oxide varistor powder with micron uniform particle size and liquid silicone rubber are mixed according to the mass ratio, stirred evenly and poured into the mold, vacuumed continuously in a vacuum drying oven; vulcanized at 150°C for 20 minutes. In the present invention, by changing the characteristics of the insulating material itself, through processing, it becomes a nonlinear conductance composite material whose conductivity parameter changes adaptively with the strength of the space field, and is used to replace the silicone rubber jacket at the high-voltage end and the ground end of the arrester. Linear conductance characteristics, intelligently control the extremely uneven distribution of electric field, without adding new additional structures, solve the problem of uneven electric field distribution in the external space of the arrester, and alleviate the deterioration of the external insulating material of the arrester due to uneven field strength.
Description
technical field [0001] The invention relates to the technical field of insulating materials, in particular to a nonlinear conductance composite material, a preparation method and application thereof, and a lightning arrester. Background technique [0002] Insulation safety has always been the most important factor in high-voltage power transmission and transformation systems. It is extremely important to protect the safe and stable operation of various electrical equipment in high-voltage power transmission and transformation systems from operating overvoltage and atmospheric overvoltage, and composite gapless oxidation As a protective device for limiting overvoltage, zinc arrester has such a function, and it is widely used in today's power transmission and transformation systems, but its external silicone rubber insulation material has been subjected to uneven electric fields for a long time. Excessive electric field intensity leads to accelerated deterioration of the silic...
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IPC IPC(8): C04B26/32C08K3/22C08L83/04H01C1/02H01C7/12C04B111/90
CPCC04B26/32C04B2111/00844C04B2111/90C08K3/22C08K2003/2296H01C1/02H01C7/123C04B22/06C04B14/30C04B14/26C04B14/307C04B22/02C08L83/04
Inventor 刘凌云张吴欣柳建军王晓光王远付波
Owner HUBEI UNIV OF TECH
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