Thermal Resistance Assessment of Insulating Materials
Many insulating materials of the same genus can vary in heat resistance. Therefore, it is inappropriate to judge the heat resistance of insulating materials according to their chemical names.
The heat resistance of various insulating materials used in the insulation structure of electrical products may be affected by other materials. In addition, the heat resistance of various materials depends to a large extent on their specific functions in the insulation structure.
As far as the use of insulating materials in electrical products is concerned, material evaluation has two purposes: one is to act asElectrical insulation structureThe other is the evaluation of a material used alone or as an integral part of a simple combination of insulation structures.
Generally, the evaluation test and operation experience are recognized as the acceptable basis for evaluating the heat resistance of insulating materials.
On the basis of operational experience, it should be noted that it must be guaranteed that the experience is applicable. But in some cases, it may also be appropriate to apply one experience to another. Appropriate methods should be developed to determine the relationship between operational experience.
Material evaluationtest methodSignificant progress has been made in research. The heat resistance of insulating materials has been improved, which can be referred to GB 11026.1, and other parts of the guidelines will be formulated.
Different temperature indices and half-deviations may be obtained for a material with different properties (e.g. electrical, mechanical, etc.), methods and failure criteria. Different temperature indices and half-deviations indicate that the heat resistance is different, which determines the way the material is used and the functions it can undertake.
Use standardsampleThe test results may be different from those obtained from the actual use of materials. The insulation structure is closer to the actual situation. Therefore, insulationStructural testThe results can prove that the materials are used in relevant applications.Applicability。