1. Insulation function: transformer oil has much higher insulation strength than air. The insulating material soaked in oil can not only improve the insulation strength, but also avoid the erosion of moisture.

　　2、散热作用：变压器油的比热大，常用作冷却剂。变压器运行时产生的热量使靠近铁芯和绕组的油受热膨胀上升，通过油的上下对流，热量通过散热器散出，保证变压器正常运行。

　　2. Heat dissipation: the specific heat of transformer oil is large, and it is often used as coolant. The heat generated during the operation of the transformer makes the oil close to the iron core and winding expand and rise by heating. Through the convection of the oil up and down, the heat is released through the radiator to ensure the normal operation of the transformer.

　　3、消弧作用：在油断路器和变压器的有载调压开关上，触头切换时会产生电弧。由于变压器油导热性能好，且在电弧的高温作用下能分触了大量气体，产生较大压力，从而提高了介质的灭弧性能，使电弧很快熄灭。

　　3. Arc suppression: on the on load voltage regulating switch of oil circuit breaker and transformer, arc will be generated when the contact is switched. Because the transformer oil has good thermal conductivity and can contact a large number of gases under the action of high temperature of the arc, it can generate a large amount of pressure, thus improving the arc extinguishing performance of the medium and making the arc extinguish quickly.

　　变压器油的特点和作用有哪些

　　What are the characteristics and functions of transformer oil

　　对变压器油的性能通常有以下要求：

　　The performance of transformer oil usually has the following requirements:

　　（1） 变压器油密度尽量小，以便于油中水分和杂质沉淀。

　　(1) The density of transformer oil shall be as small as possible to facilitate the precipitation of moisture and impurities in the oil.

　　（2） 粘度要适中，太大会影响对流散热，太小又会降低闪点。

　　(2) Viscosity should be moderate, too much influence convection heat dissipation, too small will reduce flash point.

　　（3） 闪点应尽量高，一般不应低于136℃。

　　(3) The flash point shall be as high as possible, generally not lower than 136 ℃.

　　（4） 凝固点应尽量低。

　　(4) The freezing point shall be as low as possible.

　　（5） 酸、碱、硫、灰分等杂质含量越低越好，以尽量避免它们对绝缘材料、导线、油箱等的腐蚀。

　　(5) The lower the content of acid, alkali, sulfur, ash and other impurities, the better, so as to avoid their corrosion to insulating materials, wires, oil tanks, etc.

　　（6） 氧化程度不能太高。氧化程度通常用酸价表示，它指吸收1克油中的游离酸所需的氢氧化钾量（毫克）。

　　（6） Oxidation should not be too high. The degree of oxidation is usually expressed in terms of acid value, which refers to the amount of potassium hydroxide (mg) needed to absorb the free acid in 1g oil.

　　（7） 安定度不应太低，安定度通常用酸价试验的沉淀物表示，它代表油抗老化的能力

　　(7) the stability should not be too low. The stability is usually indicated by the acid value test sediment. It represents the ability of oil to resist aging.

　　质量指标编辑

　　Quality index edit

　　外观 透明，无悬浮物、沉淀物及机械杂质

　　Transparent appearance, free of suspended matter, sediment and mechanical impurities

　　闪点(闭杯) ≥135℃

　　Flash point (closed cup) ≥ 135 ℃

　　运动黏度(50℃) ≤9.6×10-6m2/s

　　Kinematic viscosity (50 ℃) < 9.6 × 10-6m2 / S

　　酸值 ≤0.03mgKOH/g

　　Acid value ≤ 0.03mgkoh/g

　　倾点 <-22℃

　　Pour point < - 22 ℃

　　作用编辑

　　Role editor

　　1、变压器中的油在运行时主要起散热冷却作用；

　　1. The oil in the transformer mainly plays the role of heat dissipation and cooling during operation;

　　2、对绕组等起绝缘和绝缘保养作用（保持良好绝缘状态）；

　　2. Insulate and maintain the winding (keep good insulation state);

　　3、变压器油在高压引线处和分接开关接触点起消弧作用，防止电晕和电弧放电的产生；

　　3. The transformer oil acts as arc suppression at the contact point of high voltage lead and tap changer to prevent corona and arc discharge;

　　4、变压器油被广泛用作液压安全阀内的液封。

　　4. Transformer oil is widely used as liquid seal in hydraulic safety valve.

　　以上是对变压器油的特点和作用的相关内容介绍，想要了解更多欢迎咨询山东变压器油官网https://www.jnwdsh.com。

　　The above is an introduction to the characteristics and functions of transformer oil. If you want to know more, please consult Shandong transformer oil website https://www.jnwdsh.com 。