Electrical insulation of the electrical structure of the "heart", the electrical unit in life depends to a large extent on the structure of its insulation life, thus insulated structure of life evaluation and standards are increasingly being insulation technology counterparts’ attention and concern.
International Electrotechnical Commission (IEC) has two specialized technical committees related to the electrical insulation structure of functional assessment of the standard Jimmy, TC2 (rotary motor) and TC98 (insulation structure). TC2 insulation in the structure behind the functional assessment issued by the official standards are :
IEC34-18-1 (rotary motor insulation structure functional evaluation General);
IEC34-18-21 (San inlay winding thermal evaluation and classification test procedures);
IEC34-18-3 (15kV and below molding winding heat assessment and classification test procedures).
TC98 TC63 is the revocation of the original 1997 after the establishment of the new, mainly right IEC505 standards for the amendment and will be formally presented IEC1858 standards (Electrical Insulation Standard thermal process). Taken together, these are a few standards in the original United States several corresponding IEEE standards (such as IEEE117. IEEE275) on the 原文请找腾讯752018766辣,文-论'文"网http://www.751com.cn principles and methods have been redrafted to IEC34-18-22 in the form presented. Visibility their international counterparts receive respected degree. In IEC34-18-22 standard officially published before introduce UL1446. Right insulation materials and insulation technology industry may have some positive effect.
UL1446 the latest version in December 1997 of the fourth edition, which is mainly composed of three parts: a thermal aging; 2, compatibility judgment; 3, component substitution rules. Below were described
1 A thermal aging: UL1446 the thermal aging procedures are largely the same as the original IEEE117.
An insulated structure of the thermal integrity of the aging characteristics of the pilot should be at least three different temperatures to determine, Each point aging temperature of the sample, in the case of actual working parts, should not be less than 6; If the model coil, should not be less than 10; If the drum for the relay coil or, should not be less than 10.
Each aging cycle should include heat exposure, exposure to mechanical stress, and exposure to wet withstand voltage diagnostic tests Zhu stage. Thermal aging temperature should ensure that the choice of hypothermia point geometric average life expectancy of not less than 5,000 h, the high temperature point geometric average life expectancy of not less than 100 hours, and the temperature must be between points 20 ° C above the interval. Mechanical stress test on the model coil, it should be under 60 Hz to 1.5 g acceleration vibration 1h At that time, the peak-to-peak displacement of 0.2 mm. Moist exposure should not be less than room temperature, relative humidity of RH92% ~ 100% under the conditions 48 hours. Withstand voltage coil model of diagnosis, for the distance between the AC voltage of 120 V for 10 min. and the right to a phase of the AC voltage of 600 V for 10 min, when 0.75 leakage current for the Complete arise.
On the thermal aging test data assessed by reference IEEE10187 (thermal life test data statistical analysis Guideline) Jin OK. Needs to be pointed out is that the UL1446 heat aging tests with IEEE117 the difference lies, UL provides each heat Assessment must have a reference architecture (assessed or has sufficient operating experience) for the design of , whereas the IEEE117 feeding two x 104h boundaries of life.