1. Analysis of the transformation of high loss transformers in the process of the rapid development of China's power industry, the total installed capacity of electric power has also reached the leading position in the world, and the achievements made in power engineering are not only obvious to all, at the same time, it has made an important contribution to the social and economic development of our country. In power system, transformer is a very important power equipment, in which power plant, substation and transmission network need to be adjusted by transformer. In 2006, China made the relevant provisions for the use of transformers, which also made the corresponding provisions for the use of high-loss transformers, which explain that high-loss transformers will gradually be replaced. In the 1980s, our government began to use low-loss transformers to replace high-loss transformers, which can not only effectively reduce the consumption of transformer resources, but also conducive to environmental protection. The large-scale use of low-loss transformer is also gradually in progress, which urban and rural power grid is to improve the use of low-loss transformer efficiency. No-load loss is also reduced by about 8%-15% after the new low-power transformer is put into use. At present, China's distribution transformer high loss transformers are gradually introduced into the market, many new energy-saving transformers have become the mainstream products in the market. Especially in the last few years, the power system of our country is also gradually transforming the high-loss transformer, which is the important foundation of the development of our country's power industry. If the eliminated high loss transformers are not treated, the copper, silicon steel sheet and various materials contained in them will cause great pollution to the environment, and this kind of industrial pollution will also affect the ecological and natural environment. The pollution caused by the random piling of solid waste and the waste gas and waste water is very serious after they are put into the river water and the land, which we must pay attention to at present. However, with the development of transformer industry, the use of waste transformer materials can also reduce the environmental pollution caused by transformers. At present, tens of thousands of high-consumption transformers are replaced every year in our country, and the remanufacture of high-consumption transformers has brought great pressure to the market, but there are also great challenges. If the waste transformers and materials can be recycled, then the high-consumption transformers can be gradually converted into low-loss transformers, which can be used to save a lot of resources, at the same time also effectively reduce the loss of electricity, for our environmental protection will also make a very important contribution.
2. The transformation of high loss transformers into low loss transformers the transformation of high loss transformers usually adopts several different methods, including partial and total transformer replacement, in this way the transformer can effectively reduce the consumption of resources after replacement. At the same time, there is transformer load loss, if the transformation, then the transformer winding must also be better, so the original transformer components and conductors need to be replaced and adjusted in a timely manner. Among them, if the aluminum wire in the transformer is replaced by copper wire, then the iron core of the transformer if there is no fault, then after being used again, then the use density of the transformer's heart silicon steel sheet will also meet the use of the corresponding standard requirements. The main technological process of transforming high loss transformer into low loss transformer is as follows: firstly, SL7, S7 or S9 type high loss transformer which need to be reformed are tested to test its no-load loss; According to the no-load loss value of each transformer, the transformer to be reformed is redesigned by reducing the magnetic density of silicon steel sheet, increasing the turns of the transformer windings, reducing the capacity of the transformer, etc. , it can meet the performance index of S11 low loss transformer. The disassembled materials are treated as follows: the disassembled old copper wire is treated by pyrogenation to produce copper castings of other products; the old transformer oil is used for lubrication of Lathe in machining shop; The old transformer oil tank is disposed of according to the different degree of rust, and is used on the transformer after remanufacturing after being disposed of by the processes of derusting, pickling and painting, if the quality is poor or has been seriously burned in operation, it will be scrapped treatment, if the quality is good, it will be used, through derusting, adding new silicon steel sheet and other aspects of treatment for the transformation of transformers. After signing the transformer transformation contract and the technical agreement with the customer, the concrete transformation plan is as follows: first, according to the transformation transformer calculation sheet of the transformer that needs to be transformed, the drawings of high-voltage winding and low-voltage winding of the transformer are designed and the assembly of the transformer body, lead wire and General Assembly are carried out according to the manufacturing procedure of the new transformer. After the final assembly is completed, the transformer shall be tested before leaving the factory according to the requirements of the new transformer. For the iron core of high loss distribution transformer, Pw value must be decreased to reduce no-load Loss P 0, because k 0 and Gfe are constant values, and Pw value is related to magnetic flux density of silicon steel. Without replacing the iron core, the voltage and frequency are the same, so the no-load loss should be reduced. Therefore, the PW value of silicon steel plate should be reduced. In practical engineering application, in order to make better use of the iron core, if the no-load loss of the distribution transformer which needs to be reformed can not meet the requirements of the current low-loss distribution transformer under the original turn-turn potential test, when doing temporary no-load, the no-load loss is measured by means of temporary turns to adjust the number of turns of the low-voltage windings until the no-load performance index specified in the current GB/T6451-2008 standard is satisfied.
3. Distribution Transformer winding transformation basic principle of distribution transformer winding transformation company is based on transformer load loss formula derived. The resistance loss of the coil accounts for the largest proportion of the load loss of the transformer. In the process of transformer transformation, if the conductor is copper wire, the P 0 and PK value of the transformer can be reduced only by increasing the turns of the transformer low-voltage Coil When the raw material of the transformer is aluminum wire, the transformer can be reconstructed with equal capacity according to the calculation results. As the resistivity ratio of copper to aluminum at 75 °C is 0.02135/0.0357 = 0.598, the load loss ratio of copper conductor instead of aluminum conductor decreases and the cross section can be reduced to about 70% . It can be seen that this method can not only increase the number of turns and reduce no-load loss, but also make the transformer meet the need of transformation by conventional method. By using the method of replacing the old iron core of transformer with new coil, new insulation, new lead and new assembly, the high loss distribution transformer which has been withdrawn from the operation of power network is transformed into the S11 type low loss distribution transformer which meets the requirements of the national standard, make full use of copper wire, silicon steel sheet, transformer oil and other materials contained in old transformers. After this transformation, not only the pollution of these materials to the environment can be avoided, but also the use of materials such as silicon steel sheets and copper can be reduced, and a great deal of raw material consumption can be saved each year, for the country is now the implementation of the proposed conservation-oriented society to make its own contribution.
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