1 Introduction Vacuum pressure impregnation (abbreviated as VPI) is one of the most advanced insulation processing technologies and has been widely used in foreign high and low voltage motors. Although China's VPI technology started early, progress has been slow. In particular, the development of low-voltage motor VPI insulation technology has been slower. With China's accession to the WTO, the application of domestic glue VPI technology has developed rapidly. Every year, several motor manufacturers have joined the ranks. This puts more and more stringent requirements on the key materials used for the less-gelled VPI insulation. As one of the most critical materials for low-grade VPI insulation, a small amount of VPI-impregnated resin has been the leading epoxy resin system for many years in the country. With the entry of ESOIL from Switzerland into China, 3308 unsaturated polyesterimide is less effective. VPI impregnated resin is displayed in front of people. Its excellent performance, stable storage period and low-temperature fast curing characteristics have prompted people to start developing new type of low-gel VPI impregnating resin.
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2 Test section 2.1 Main raw materials 185 Resin: Self-made 152 resin: Homemade 210 resin: Self-made styrene: Industrial product Diisopropylene peroxide: Industrial product Hydroquinone: Reagent stabilizer: Reagent 2.2 Synthetic process Add 185 resin by formula And 152 resin, in the role of the catalyst, strictly in accordance with the given process parameters to the end of the reaction. Add 210 resin for blocking reaction. Add hydroquinone by cooling. When the temperature is lower than 80°C, dilute it with styrene, then add the rest of additives, stir and filter at the appropriate temperature, then obtain the H9110 unsaturated polyesterimide immiscible resin without impregnation. .
3 Results and discussion Storage stability and dielectric loss factor of the stained resin can meet the requirements of the high performance 3.1H9110 impregnated resin's conventional performance of motor-reduced VPI impregnated resin; thick layer curability and adhesion This test consists of mechanical industrial electrical material product quality The supervision and inspection results fully meet the requirements of the insulating paint standard.
The measurement center is completed, as shown in Table 1. Test results show that H9110 impregnated table 1H9110 impregnated resin conventional performance No. Test item Qualified standard value Test results Viscosity (23 ± rc; No. 4 cup viscometer), s gel time (135 soil rc), min sealed container Storage stability (60 ± 2"C, 96h) Viscosity increase no more than 0.8 Not inferior to S1, U1, I3.2 Uniform volume resistivity (23 ± 2 °C), 8 Electrical strength (Rapid boost mode: 23 ±2*C), MV/m dielectric loss factor adhesion force (harness method, 23±2*C), N 2 temperature effect on viscosity Viscosity is the main factor that determines the fluidity and permeability of the impregnating resin. The viscosity of the resin changes with temperature.
Viscosity-Temperature Change Curve It can be seen that the viscosity of the H9110 impregnated resin decreases significantly with increasing temperature, and has a good viscosity-temperature characteristic, and impregnation of motor windings with it is excellent in permeability and filling properties.
3.3 The influence of temperature on the gelation time The gelation time is one of the main basis for determining the baking process parameters. It is known that the gelation time of the H9110 impregnated resin changes with temperature. The gelation time of the H9110 impregnated resin increases with the temperature. Significantly shortened, with good gel time temperature characteristics.
The gelation time at 150°C is only 3 minutes, so when baking at high temperature, the loss of resin is small, and the coil has a high amount of paint and insulation. It ensures that the resin content of the high-voltage motor is less than that of the VPI insulation structure, so that it has excellent integrity.
Temperature m Gelation time vs. temperature curve 3.4 Storage stability test 3.4.1 Closed storage test degree The test results are shown in Table 2.
Table 2 Closed Storage Test Results Storage Conditions Pre-storage Viscosity s Storage Viscosity s Viscosity Growth Times Appearance 30 40.01 Uniformly Transparent Table 3 Room Temperature Storage Test Results Test Time Viscosity s Viscosity Increase Times Gel Times As can be seen from Table 2, in closed storage conditions , H9110 impregnated resin viscosity growth is very slow, good storage stability.
342 Room temperature storage test After the one-year storage of the H9110 impregnated resin at room temperature, the change in the viscosity and gelation time of the No. 4 cup is shown in Table 3.
The results showed that the H9110 impregnated resin had a small change in viscosity and gelation time after being stored at room temperature for one year and had good storage stability. In actual use, it also adopts a method of regularly adding new resin and polymerization inhibitor so that it can be used indefinitely, and it fully meets the basic requirements for VPI impregnated resin.
4 Aging Test of Insulation Structure 4.1 Sample H9110 unsaturated polyesterimide immiscible solvent-free resin and 9547~1 single-faced glass cloth reinforced less mica tape, both of which were developed and produced by Harbin Qingyuan Electric Material Co., Ltd. .
Fully cured low-resistance anti-halo tapes and semi-cured high-impedance anti-halo tapes are produced by Isola.
2 Bar Normal and Thermoelectric Aging Test Method: Refer to US GE standard test temperature: Normal electrical aging to room temperature; Thermoelectric aging to 120 °C Table 4 Normal, thermoelectric aging test results Rod life, h Note normal aging The thermoelectric aging aging test was completed by Guilin Institute of Electrical Science. The test results are that the normal electric aging median life is greater than 90Ch, and the thermoelectric aging median life is greater than 100Ch, which is equivalent to the first-class product level according to the medium-grade high-voltage motor immersion coil quality standard JB/TB/50133-1999. It shows that the insulation structure can meet the insulation requirements of high voltage motors of 1kV.
5 Application Harbin Qingyuan Electric Material Co., Ltd. developed and produced H9110 unsaturated polyesterimide immiscible solvent-free impregnating resin and 9547-1 single-sided glass cloth reinforced less plastic powder mica tape (binder resin is H9110 unsaturated polyester The application test of imine-free solvent-impregnated resin lacquer with the new main insulation structure was completed by Beijing Bijie Electric Co., Ltd., Jinan Power Generation Equipment Factory and Nanjing Steam Turbine Electric Motor Group Co., Ltd. respectively.
1 Application test of Beijing Bijie Electric Co., Ltd. The application test results of Beijing Bijie Electric Co., Ltd. are shown in Table 5.
The application test results show that the electrical performance of H9110 impregnating resin and the test coils of 9547- Table 5 have a good breakdown voltage kV 1 and the compatibility of the mica tapes with good quality is good. The main insulation obtained has a comparative (25CkW, 6kV) and two Taiwan Y4501- good electrical insulation properties. The Y3557-6 made of the paint passed the factory quality inspection, and all the indicators were qualified.
5.2 Application Tests for Jinan Power Generation Plant The application tests of Jinan Power Generation Plant are shown in Table 6 and Table 7. It can be seen that the normal tan5 and VtanD have reached the level of excellent products per 0.2UnVtanD.
The breakdown voltage of the clutch coil is 1 50133-1999. The medium-sized high-voltage motor requires less gluing quality of the dip coil. The 6kV coil has an instantaneous breakdown voltage value of 42kV, so it can reach the level of superior products and first-class products.
Jinan Power Plant has a small plastic VPI insulation system. The thickness of the main insulation of the 6kV motor is 1.7mm. The thickness of the main insulation of the 1tkV motor is 2.7mm, which is 20% thinner than the main insulation of the multiple rubber molding structure with the same voltage class. In the case of constant power, the motor size can be reduced and raw materials can be saved; under the same volume, the efficiency can be increased and the production cost can be reduced. At the same time, the thermal conductivity of the stator is increased, thereby reducing the operating temperature rise and weakening. The degree of insulation aging, thereby increasing the operating life of the motor. So far, using H9110 impregnating resin and 9447-1 less mica tape, a total of more than 200 sets of 6kV and 10kV motors have been produced, all of which meet the JB/T 7593-94 standard. Compared with the use of foreign insulation structures, savings of hundreds of thousands of dollars.
Table 6 Normal dielectric loss factor Test value Coil 0 Table 7V Motor coil dielectric loss factor Test value standard, % pass Grade 1 Normal state Every 0 Hot state Table 8 Test items and results of the complete machine No. Item 20004 Pressure test, kV Pass Through the 5 motor temperature rise test, K56 (design value 57K) (test equipment in repair) 5.3 Nanjing Turbine Electric Group Co., Ltd. application test results shown in Table 8, it can be seen that the motor temperature rise is very low. H9110 impregnated resin has a good storage stability, after 10 tons impregnated resin into VPI tank 6 months, without adding new resin and reactive diluent, the viscosity of the impregnated resin is basically unchanged, when the resin is impregnated with H9110 The disadvantage is that under high vacuum 6 Conclusion H9110 unsaturated polyesterimide immiscible solvent-free impregnation resin with good overall performance, excellent storage stability, reasonable price, fast curing at low temperature, is an ideal small plastic VPI impregnating resin.
The test shows that the high-voltage motor less plastic VP new main insulation structure has good compatibility, normal electrical aging is greater than 900, thermoelectric aging is greater than 1000h, reaches the level of first-class products, fully able to meet the requirements of medium-sized high-voltage motors.
(3 Due to the strong application of the motor factory, H9110 unsaturated polyesterimide immiscible solvent-free impregnating resin has produced more than 300 tons, has good processability, stable performance and quality, and is at the leading level in China, filling the domestic gap.
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