变压器油的介电常数是多少? - 山东变压器油哪家好

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变压器油的介电常数是多少?

发布时间2019-05-07  来源:http://www.wunqdctk.com

  变压器油的成份是很复杂的,主要是由环烷烃、烷烃和芳香烃构成,变压器油它的相对介电常数ε在2.2-2.4之间,纯净的变压器油的耐电强度是很高的,可达4000kV/cm以上,但是工程上用的净化的变压器油,只能达到50~60kV/2.5mmThe composition of transformer oil is very complex, mainly composed of naphthenes, alkanes and aromatic hydrocarbons. Its relative dielectric constant is between 2.2 and 2.4. The electric resistance of pure transformer oil is very high, which can reach more than 4000 kV/cm. However, the purified transformer oil used in engineering can only reach 50-60 kV/2.5 mm.
  这主要是因为在制造和运行过程中不可避免地会有杂质、水分、气泡等混入,而且在运行中受电场和热的影响,油会分解出气体和聚合物。在高电场中,这些分解出来的气体,以及油中的水分和纤维等杂质,在电场作用下,顺着电场方向,排列成“小桥”,成为泄漏的通道,情况严重时,导致“小桥”击穿,使油的耐压强度降低。因此,变压器内部绝缘的结构,要考虑上述因素,采取必要措施,防止形成“小桥”。
  This is mainly because impurities, moisture and bubbles are inevitably mixed in the manufacturing and operation process, and oil will decompose into gas and polymer due to the influence of electric field and heat in operation. In high electric field, these decomposed gases, as well as impurities such as water and fibers in oil, are arranged into "small bridges" along the direction of electric field under the action of electric field, and become leakage channels. When the situation is serious, the "small bridges" will break down and the compressive strength of oil will be reduced. Therefore, the structure of transformer internal insulation should consider the above factors and take necessary measures to prevent the formation of "small bridge".
  热老化在所有变压器油中都存在,油箱中既有原来残留的氧,而纤维分解时也会产生氧。运行温度较高时,变压器油的氧化过程就进行得比较快,使得粘度增高、颜色变深、泊泥增多、值增大、击穿电压下降等。另外,还存在着电老化的问题,随着加压时间的延长,油间隙的击穿电压下降。油浸电力变压器中,高场强处产生局部放电,促使油分子进一步互相缩合成更高分子量的腊状物质,同时逸出低分子的气体。腊状物质积聚于高场强区附近的绕组绝缘上,堵塞油道、影响散热、产生的气体增多,放电更易发展。
山东变压器油
  Thermal aging exists in all transformer oils. There is not only residual oxygen in the tank, but also oxygen when the fibers are decomposed. When the operating temperature is higher, the oxidation process of transformer oil proceeds faster, which makes the viscosity increase, the color deepen, the mud increase, the value increase, the breakdown voltage drop and so on. In addition, the problem of electrical aging still exists. With the extension of pressurization time, the breakdown voltage of oil gap decreases. In oil-immersed power transformers, partial discharge occurs at high field strength, which promotes the further condensation of oil molecules into wax-like substances with higher molecular weight and the escape of low molecular weight gases. Wax-like substances accumulate on winding insulation near high field strength area, blocking oil pipeline, affecting heat dissipation, increasing gas generation, and making discharge easier to develop.
  因此在运行中需经常对油进行检查、试验,并及时进行处理(滤油等)。现在不少大型变压器采用充氮保护或隔膜保护措施。隔膜保护是用一略小于储油柜的耐油橡胶胶囊填充于储油柜的油面上,胶囊与大气相通,因而隔绝了变压器油与大气的接触。这样就保证了油性能的稳定。
  Therefore, oil should be checked and tested frequently in operation, and treated in time (oil filter, etc.). Nowadays, many large transformers adopt nitrogen-filled protection or diaphragm protection measures. The diaphragm protection is filled with an oil-resistant rubber capsule slightly smaller than that of the oil storage tank. The capsule communicates with the atmosphere, thus isolating the contact between transformer oil and the atmosphere. This ensures the stability of oil performance.
  以上内容由山东变压器油厂家整理发布,更多相关信息可以点击我们的官网进行咨询:http://www.wunqdctk.com
The above contents are arranged and published by Shandong transformer oil manufacturers. More relevant information can be consulted by clicking on our official website: http://www.wunqdctk.com.
 
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