The last one described the trend of standardization of electrical insulating materials, and then talked about the trends of standardization of electrical insulating materials, mainly divided into five aspects. Since the establishment of IEC/TC112, a lot of work has been done in the process of formulation and revision in order to publish 10 international standards and revise 20 international standards. The published international standards are based on the existing new technologies and methods. At present, the testing techniques urgently needed for insulating materials and systems include the effects of ionizing radiation of electrical insulating materials, long-term radiation aging of polymers, recycling and reuse of polymer materials, heat-resistant and high-temperature heat-shrinkable pipes for electrical insulation systems, and space. Charge Measurement Method (PEA and PWP), Simplified Thermal Resistance Test of Shenzhen Thermal Shrinkage Pipe Insulation Material, Statistical Analysis of Breakdown Data and General Method for Evaluating Electrical Insulation Material, etc.
At present, IEC/TC112 incorporates some new technologies and methods into the standard, which can be summarized into five aspects as follows:
1. Thermogravimetric analysis (DGA) and thermogravimetric analyzer (TGA) are used to evaluate the activation energy of aging of thermal shrinkable pipes of insulating materials. This technology will be introduced into the standard after verification by parallel tests.
2. In response to the requirements of IEC/TC2 (Rotary Motor Commission), the technical specifications for measuring partial discharge in electrical insulating materials and systems should be upgraded to international standards, and the relevant standards in IEC/TC42 (Technical Committee for High Voltage and Current Testing) should be consulted.
3. The test methods of volume resistivity and volume resistivity of impregnated and coated materials were developed.
4. The development of thermal evaluation and testing methods for liquid and solid mixing components of motors is planned.
5. Standards will be developed for thermal evaluation of insulation systems of high-voltage motors and generators.