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JFEM电机引接线电流的热效应特种电缆

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参考价: ￥ 10

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产品型号JFEM

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更新时间：2023-07-12 09:11:19浏览次数：502次

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产品简介

江苏春晨电缆有限公司专业生产电机引接线，JFEM电机引接线电流的热效应，实验证明当电流过导体时，由于自由电子的碰撞，导体的温度会升高。这是因为导体吸收的点电能转换成为热能的缘故。这种现象叫做电流的热效应

详细介绍

实验证明当电流过导体时，由于自由电子的碰撞，导体的温度会升高。这是因为导体吸收的点电能转换成为热能的缘故。这种现象叫做电流的热效应。电流通过导体时所产生的热量与电流强度的平方、导体本身的电阻、以及电流通过的时间成正比。这一结论称为焦耳——楞次定律，其数学表达式为：Q=I²Rt，公式中：
Experiments show that when a current is over a conductor, the temperature of the conductor increases because of the collision of free electrons. This is because the electrical energy absorbed by the conductor is converted into thermal energy. This phenomenon is called the thermal effect of the current. The heat generated by a current through a conductor is proportional to the square of the current intensity, the resistance of the conductor itself, and the time passed by the current. This conclusion is called Joule - Lenz's law, the mathematical expression of Q=I - Rt in the formula:
Q：电流通过导体所产生的热量，单位：焦耳（J）；
Q: the heat generated by a current through a conductor, unit: Joule (J);
I：通过导体的电流，单位：安（A）；
I: through the current of the conductor, unit: an (A);
R：导体的电阻，单位：欧（Ω）
R: the resistance of a conductor, unit: Europe (omega)
如果热量以卡位单位，则Q=I?Rt公式可写成：Q=0.24I²Rt=0.24Pt，此公式称为焦耳-楞次定律。其中t的单位为妙，R的单位是欧，I的单位是安，热量的单位是卡。JFEM电机引接线电流的热效应
If the heat in card unit, Q=I? Rt equation can be written as: Q=0.24I - Rt=0.24Pt, this formula is called the Joule Lenz. The unit of T is wonderful, the unit of R is Europe, and the unit of I is Ann, and the unit of heat is card.
电流的热效应在生产上有许多应用。电灯是利用电流产生的热使得灯丝达到白炽状态而发光，熔断器是利用电流产生的热使其熔断而切断电源。电流的热效应也是近代工业中的一种重要加热方式，如利用电炉炼钢，电机通电烘干等。电流的热效应也有它不利的一面，由于构成电气设备的导线存在电阻，所有电气设备在工作时要发热，使温度升高。如果电流过大，温度升高多就会加速绝缘体老化，甚至损坏设备。为了保证电气设备能正常工作，各种设备都规定了限额，如额定电流、额定电压、和额定电功率等。JFEM电机引接线电流的热效应
The thermal effect of current has many applications in production. The electric lamp is the heat produced by the current that makes the filament light up in the incandescent state, and the fuse uses the heat generated by the current to break it off and cut off the power. The thermal effect of current is also an important heating mode in modern industry, such as the use of electric furnace steelmaking, electric motor drying and so on. The thermal effect of electric current also has its disadvantage. Because there are resistances in electrical conductors that make up electrical equipment, all electrical equipments must be heated when they are working, so that the temperature will increase. If the current is too large, the increase of temperature will accelerate the aging of the insulator and even damage the equipment. In order to ensure the normal work of electrical equipment, all kinds of equipment are prescribed limits, such as rated current, rated voltage, and rated electric power.
电器设备的额定值通常用下标“e”表示，如Ie、Ue、Pe等，各种电器设备的铭牌上都有标注他们的数值。
The rated value of electrical equipment is usually expressed as "e", such as Ie, Ue, Pe and so on. All kinds of electrical equipment nameplates are marked with their values.