文昌干式变压器：文昌干式变压器局部放电老化

文昌干式变压器局部放电老化 　　
在文昌干式变压器绝缘、特别是树脂绝缘中总是或多或少、或大或小地存在气隙或气泡，如前所述这是由于绝缘材料存在某些缺陷，以及工艺不够完善而造成的.从而导致绝缘中产生局部放电.它是树脂绝缘干变老化的土要因素。
由于树脂绝缘介电系数比空气大得多，在交流电压下，气隙或气泡中场强按介电系数成反比分配，故其中的场强比树脂中的场强高得多.因而其中局部放电就较易发生。
局部放电对于绝缘结构起腐蚀作用.当局部放电发展到相当严重时，终导致绝缘结构发生击穿。因此为了保证绝缘正常使用寿命.采取降低局部放电的措施是十分必要的。
气隙或气泡中发生局部放电.是局部电场发生畸变，气隙或气泡电离将造成附近局部电场畸变，使局部介质承受过高的场强。
电离后的带电粒子(电子、离子等)撞击气泡壁，破坏其分子结构，从而使绝缘受到损伤。
由于带电较子的撞击作用.使绝缘出现局部温度升高，从而引起绝缘局部过热，严重时可出现炭化。

Transformer partial discharge aging

In the dry-type power transformer insulation, especially cause联系人：陈经理d by resin insulation is always more or less, or large or small, exist in the air gap or air bubbles, as mentioned earlier this is due to the insulating material there are some defects, as well as the process is not perfect the resulting partial discharge in insulation. resin insulation dry soil varying aging.
Resin insulating dielectric constant is much greater than air, the AC voltage, air gap or bubble field strength is inversely proportional to the dielectric constant allocation, the field strength is much higher than the resin in the field. Thus local discharge is more likely to occur.
Partial discharge for insulating the structure from the corrosive effects of partial discharge development is quite serious, eventually leading to the insulating structure breakdown. Therefore, in order to ensure the insulation of normal life. Take measures to reduce the partial discharge is essential.
Partial discharge occurs in the air gap or air bubbles. Local electric field distortion of the air gap or air bubbles ionization caused by the local electric field near the distortion, so that the local media to withstand the high field strength.
Ionization of charged particles (electrons, ions, etc.) impact the bubble wall, the destruction of their molecular structure, so that the insulation is damaged.
Children live impact role. Insulation to the local temperature increased, causing the insulation to local overheating can occur in severe charring.

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