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高温会对电气设备有影响吗?

发布时间:2021-09-06 来源:http://www.tongyuhengcheng.com/ 浏览量:

1、对金属材料的影响温度升高,金属材料软化,机械强度将明显下降。例如,铜金属材料长期工作温度超过200℃时,机械强度明显下降;短时工作温度超过300℃时,机械强度也明显下降,铝金属材料的机械强度也与温度密切相关。通常,铝的长期工作温度不宜超过90℃,短时工作温度不宜超过120℃。
1. Effect on metal materials: with the increase of temperature, the metal materials will soften and the mechanical strength will decrease significantly. For example, when the long-term working temperature of copper metal materials exceeds 200 ℃, the mechanical strength decreases significantly; When the short-time working temperature exceeds 300 ℃, the mechanical strength also decreases significantly, and the mechanical strength of aluminum metal materials is also closely related to temperature. Generally, the long-term working temperature of aluminum should not exceed 90 ℃, and the short-term working temperature should not exceed 120 ℃.
2、对电接触的影响电接触不良是导致许多电气设备故障的重要原因,而电接触部分的温度对电接触的良好性影响极大,温度过高,电接触两导体表面会剧烈氧化,接触电阻明显增加,造成导体及其附件(零部件)温度升高,甚至可能使触头发生熔焊。由弹簧压紧的触头,在温度升高后,弹簧压力降低,电接触的稳定性更差,更容易造成电气故障。
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2. Impact on electrical contact poor electrical contact is an important cause of many electrical equipment failures, and the temperature of the electrical contact part has a great impact on the good performance of the electrical contact. If the temperature is too high, the surfaces of the two conductors in the electrical contact will oxidize violently, and the contact resistance will increase significantly, resulting in the increase of the temperature of the conductor and its accessories (parts), and even the fusion welding of the contact. For the contact pressed by the spring, after the temperature increases, the spring pressure decreases, the stability of the electrical contact is worse, and it is easier to cause electrical failure.
3、对绝缘材料的影响温度过高,有机绝缘材料将会变脆老化,绝缘性能下降,甚至击穿,材料的使用寿命也将缩短。例如,A级绝缘材料在一定温度范围内,每增加8—10℃,材料的使用寿命约缩短50%。因此对电机类设备存在较大影响;温度过高,对无机绝缘材料的绝缘性能也有明显影响。如,电瓷的击穿强度在温度为80℃以下时约为250kv/mm。到100℃时,其击穿强度约为100kv/mm。
3. If the temperature of the insulating material is too high, the organic insulating material will become brittle and aging, the insulation performance will decline, even breakdown, and the service life of the material will be shortened. For example, the service life of class a insulating material is shortened by about 50% for every 8-10 ℃ increase in a certain temperature range. Therefore, it has a great impact on motor equipment; If the temperature is too high, it also has a significant impact on the insulation performance of inorganic insulating materials. For example, the breakdown strength of electric porcelain is about 250kV / mm when the temperature is below 80 ℃. At 100 ℃, the breakdown strength is about 100 kV / mm.
4、对电子元器件的影响高温是许多电子元器件的大敌,如高温可使半导体元件热击穿,因为温度升高,电子激活程度加剧,使本来不导电的半导体层导通。高温使电子元器件的性能变劣,如在偏高酌温度下,电子元件的反向导电电流增加,放大倍数减小等。
4. Influence on electronic components high temperature is the great enemy of many electronic components. For example, high temperature can cause thermal breakdown of semiconductor components. Because the temperature increases, the degree of electronic activation intensifies, making the originally non-conductive semiconductor layer conductive. High temperature deteriorates the performance of electronic components. For example, under high temperature, the reverse conductive current of electronic components increases and the magnification decreases.
5、按国标设计和制造的电气设备运行时周围环境温度的上限值不应超过40℃,而盛夏暴露在烈日中的运行配电箱,由于太阳光的直射、水泥地面热量的反射以及箱内设备自身产生的热量, 有时箱内的温度竟超过60℃。如此高的温度极易造成电器线圈、引线的绝缘老化而击穿烧坏。电器触头因温度过高而增加接触电阻,接触电阻增加又加剧发热,如此恶性循环最终导致触头烧坏;同时温度过高还会影响电器保护性能的稳定性、动作的可靠性、计量的准确性。
5. When the electrical equipment designed and manufactured according to the national standard operates, the upper limit of the ambient temperature shall not exceed 40 ℃. For the operation distribution box exposed to the hot sun in midsummer, sometimes the temperature in the box exceeds 60 ℃ due to the direct sunlight, the reflection of the heat of the cement ground and the heat generated by the equipment in the box. Such a high temperature can easily cause the insulation aging of electrical coils and leads to breakdown and burn out. The contact resistance of electrical contacts increases due to too high temperature, and the increase of contact resistance intensifies heating. Such a vicious cycle eventually leads to contact burnout; At the same time, too high temperature will also affect the stability of electrical protection performance, the reliability of action and the accuracy of measurement.
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The above information is the knowledge sharing provided by the electrical complete set to Xiaobian. For more wonderful contents, please click our website: http://www.tongyuhengcheng.com We will have more content for you to check later
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