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LCWB-220kV current transformer insulated experimental analysis of anomalies


5 ~ 271CT degassing fuel tank, according to Yue test can be seen from Table 5, N9271CT degassing refueling, dielectric loss tg8 to 4.87 did not decrease, but some increases, but also that x wax (mentioned below) there is the main cause tg8 increase. Partial discharge in oil when 30000pc, after degassing fuel 550pc, also shows that the Bureau due to heavy volume 30000pc is short of oil, but heavy volume as the Bureau of 550pc, is still far beyond the required standards, also shows that there are serious internal CT 3N9-discharge phenomena 268CT hanging core disintegration of selected N ~-271CT do degassing, oiling experiment, and choose N ~-268CT doing hanging core disintegration test. From the test, suspended the core, the disintegration of the situation, CT did not find the main insulation breakdown flashover traces the disintegration of the manufacturing process were found to have defects such as hand-wrapped insulation tape is not tight, fold 232Vo1.17. No. 4HeilongjiangElectricPowerAttg. Over 1995, shown in Figure 1. This will inevitably exist air hole, resulting in partial discharge. l l eleven Bao edge around a handbag off the oxygen present in young, ugly air hole X Wax Figure 1 shows a bar attached to the middle of the insulation paper in many orange and yellow wax (which is a length of about S0cm), U-shaped coil in a straight line both sides of this matter, it is precisely this part of the folds are more tightly packed the site is not, the rest is no such phenomenon was, in electrical insulation tape wrapped car ask to see the process of wrinkles still exist. In addition, a coil treatment process is not fine, smooth surface, pitting more, there is a small glitch, shown in Figure 2 / ■ l 2 a bar diagram Yue solution _c # 4 Conclusion from oil breakdown strength, chromatography, the main dielectric loss tg8, partial discharge test data analysis, b ~-26CT oil breakdown strength is due to the low seal well, the oil caused by damp; from chromatographic data,, H, CH excessive gas, gas production quickly; from heavy volume data analysis bureau, Bureau of heavy volume larger, there are instructions within the CT discharge site. The disintegration of the core found in the hanging length of about 50cm x-insulating paper with wax, just shows where the partial discharge site. Chromatography with the exception of the insulating paper winding process causes some defects are directly related. As the insulation tape in the winding process, uneven walking speed, resulting in a coil wrapped a large number of layers of insulating paper folds. And another bad vacuum drying, residual gas in the insulating layer of paper or aluminum foil in the form of partial discharge,herve leger toronto, partial discharge of this accumulation, the expansion, and finally evolving from a solid to a liquid insulation in the insulation. This is the root cause of the accident. Dielectric loss tg8 too large, especially the b ~-271CT degassing refueling test, tg8 not reduced,tods shoes outlet, but some increase,vibram five fingers outlet, indicating the CT x-wax produced within the discharge is increased dielectric loss tg8 ■ the main reason. Partial discharge in oil due to the Schottky electrode decomposition and radiation effects, the oil decomposition, together with the number of original oil in total there are some impurities, it is easy to make paper at the aggregation layer of a kind due to polymerization and the resulting x orange wax (wax that x cable, capacitors and tube is more, sometimes in the turn insulation transformer or other similar insulating gap at the corner of the oil found it), X wax,Salvatore Ferragamo outlet, make the loss of insulating media tga surge, lower heat capacity, can easily lead to thermal breakdown. When the partial discharge is large, the performance of a series of electrical eleven eleven physical chemistry. Generally have a slow corrosion of insulating role, which is the main factor affecting the life of insulation. Through this analysis, the Hunan Electric Porcelain Factory produced a LCWB a 220kV current transformer 1987--1989 year product manufacturing process some problems do exist, it is recommended to run departments to strengthen supervision of their products, maintenance, and avoid run accident. Preventive measures are as follows: a. Should be appropriate to shorten the cycle of oil chromatography is recommended once every quarter chromatography test. b. Expansion of the device without the installation of metal Can CT as soon as possible expansion device, on the one hand to prevent the wet insulation, and also to prevent the CT, once the metal expander pointer exception of oil increased, the details of their internal pressure, should immediately take the necessary measures. C. Once a CT increase of hydrogen,Beats By Dre Headphones, should immediately quit running, it is recommended to do PD, pinpoint the cause. To the scene, should be vacuum degassed, to be able to get 60 ~ l33. and continued over a l2-hour. Oiling, the residual pressure should not exceed 133. a. Then do the PD, such as the Bureau of heavy volume to meet the order requirements, can be put into operation, if the Board is still excessive heavy volume and manufacturers should contact the Depot overhaul. (Times set draft Received Date} l995-06-05)
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