南昌干式变压器：SF6气体性质

SF6气体性质 　　
SF6气体是一种优良的绝缘和灭弧介质，它具有无毒、不可燃、绝缘强度高和灭弧能力远远超过一般电介质的特点。因而，SF6气体绝缘设备占地面积小，无火灾危险，提高了系统的可靠性。

1.物理性质
在标准条件下，SF6气体为无色无味的气体.在高压电气设备中，SF6气体的工作压力通常为0. 2—0.7MPa,呈气态；在钢瓶中，SF6通常以液态形式存在，以便运箱和贮存。

2.化学性质
SF6的化学性质非常稳定，在空气中不燃烧，不助燃，与水、强碱、氨、盐酸、硫酸等不反应。SF6的热稳定性好，在常温或较高温度下都不会发生自分解反应, SF6的热分解温度大约为500℃左右。但在有某些金属存在的情况下，SF6的稳定性则大为降低，其热分解温度为150-200℃.然而.在223℃高温下，各种金属置于SF6气体中长达270天的试验结果表明，其腐蚀程度仍然是微不足道的.

3. SF6混合气体的绝缘特性
SF6气体具有优良的电气特性和稳定的化学性能。但是由于SF6气体价格较贵，液化温度相对较高，对电场均匀性十分敏感，使用SF6混合气休的主要目的之一是降低绝缘气体的投资，试脸结果表明。SF6气体的含量为60%〔体积分数)的SF6-N,混合气体在压力为0.51MPa时，其绝缘强度与压力为0. 45MPa的纯SF6气体相当。同时，可节约投资约32 %，液化温度也比纯SF6气体降低9℃。

SF6南昌干式变压器

SF6 gas properties

SF6 gas is an excellent insulating and arc-quenching medium, it has a non-toxic, non-flammable, high dielectric strength and arc-quenching capacity far exceeds the general characteristics of the dielectric. Thus, SF6 gas-insulated eq邮 箱：1262980066@qq.comuipment, small footprint, no fire danger, improve power system reliability.

1 Physical properties
Under standard conditions, SF6 gas is colorless and odorless gas in the high-voltage electrical equipment, SF6 gas pressure of work is usually 0. 2-0.7MPa, gaseous; in cylinders, SF6 is usually in liquid form for transport boxes and storage.

(2) chemical properties
The chemical properties of SF6 is very stable, do not burn in air, no combustion, and water, alkali, ammonia, hydrochloric acid, sulfuric acid, which do not react. SF6 thermal stability at room temperature or higher temperatures will not occur since the decomposition reaction, SF6 thermal decomposition temperature of about 500 ℃ or so. However, where the presence of certain metals, SF6 stability is greatly reduced, the thermal decomposition temperature of 150-200 ℃. However, at 223 ℃ high temperature, SF6 gas in a variety of metal placed up to 270 days the test results showed that the corrosion is still negligible.

3. SF6 insulating properties of the gas mixture
SF6 gas has excellent electrical p手 机：13287501888roperties and chemical stability properties. However, due to higher prices SF6 gas, liquid temperature is relatively high, uniform electric field is very sensitive, the use of SF6 gas mixture off of the main objectives is to reduce the insulating gas investment, test results show that face. SF6 gas content of 60% [volume fraction) of the SF6-N, gas mixture at the pressure of 0.51MPa, its dielectric strength and the pressure of 0. 45MPa quite pure SF6 gas. Meanwhile, the investment can save about 32%, liquefied gas temperature lower than that of pure SF6 9 ℃.

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