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1. The role of the insulating material is to isolate the charged portion of the potential in the electrical equipment. Therefore, the insulating material should first have a higher insulation resistance and pressure resistance, and can avoid leakage, breakdown and other accidents. Secondly, heat resistance is good, avoiding aging due to long-term overheating and aging; in addition, there should be good thermal conductivity, resistance to lightning protection and high mechanical strength and convenient process processing. According to the above requirements, the performance indicators of commonly used insulating materials have insulating strength, tensile strength, specific gravity, expansion coefficient, and the like.
2. The higher the voltage added by the insulation: the higher the voltage applied to the insulator, the larger the electric field power in the material, the more easily occurring ionization collision, resulting in an insulator breakdown. The lowest voltage to break through the insulator is called the breakdown voltage of this insulator. When the 1 mm thick insulating material is broken, it is necessary to add the voltage of the electric quadrant to the insulating pressure of the insulating material, referred to as the insulation strength. Due to the insulating materials, there is a certain insulation strength, various electrical equipment, various safety utensils (electrician clamps, test pens, insulating gloves, insulation bats, etc.), various electrical materials, manufacturing plants have stipulated that certain allowable use voltages, called For the rated voltage. The voltage to be permeated during use exceeds its rated voltage value to avoid accidents.
3, the insulation performance of the insulating material is closely related to the temperature. The higher the temperature, the worse the insulation performance of the insulating material. To ensure insulation strength, each insulating material has an appropriate maximum allowable operating temperature, below this temperature, can be used for a long time, more than this temperature will grow rapidly. According to the degree of heat resistance, the insulating material is divided into Y, A, E, B, F, H, C, etc.. For example, the highest allowable operating temperature of the A-stage insulation is 105 ° C, and the distribution transformer in the electric motor is mostly used in the motor.
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