Amorphous alloy distribution transformer will become "star"

Amorphous alloy core distribution transformer, no-load loss compared to silicon steel transformers substantially reduced, energy-saving effect is obvious, and its overall cost of life is lower than the traditional transformer, economic benefits are good, is expected to become the power equipment Celebrity".

Unique charm

Compared with silicon steel transformers, amorphous alloy transformers have a more comprehensive advantage.

First, amorphous alloy transformers have low no-load losses. According to the code number of the lossy performance in the transformer model, the amorphous alloy transformers are SBH15 and SBH16. For each digit increase of 1, the no-load loss decreases by more than 10%. For example, the no-load loss of the SBH15-type amorphous alloy transformer is lower by about 75% than that of the S9 silicon steel transformer. The no-load loss of the SBH16-type amorphous alloy transformer is lower by about 25% than the SBH15-type amorphous alloy transformer.

Second, although the average price of amorphous alloy transformers is higher than that of silicon steel transformers, the overall cost of the whole life cycle is lower. Because the amorphous alloy transformer uses new materials and new technologies, the process is complex, so its product prices are higher than traditional transformers, generally 30%-55% higher than traditional transformers of the same type, compared to ABB which has certain brand and service advantages in the industry. Other companies such as silicon steel transformers, the overall cost is about 20% higher. However, due to its significant energy savings and lower operating costs, its overall cost is lower than traditional transformers. According to the study of amorphous alloy core transformers from different angles in many foreign countries, including accelerated aging of service life, on-site operation and special tests, it is proved that the amorphous alloy transformer has stable no-load characteristics over a 30-year life span and does not exist. There is a change in the operating loss of the hollow load and there is a high reliability.

Broad prospects

The advantages of amorphous alloy distribution transformers are obvious, and they have a wide range of applications. However, the actual number of transformers currently used in China is not large, and only about 120,000 units are in operation, covering Beijing, Shanghai, Chongqing, Jiangsu, Zhejiang, and Fujian. Shandong, Shanxi, Guangdong, Henan, Sichuan, Ningxia, Tibet, Liaoning, Jilin, and more than 20 provinces (cities, autonomous regions). In the long run, its large-scale application prospects in China are worth looking forward to.

As far as policy is concerned, with the guidance of the national energy conservation policy, high-loss transformers such as S7 and S8 will exit the transformer stage, and S9-type transformers will also be gradually included in the replacement scope. Distribution transformers with S11-type or higher performance levels will be Popular application in distribution network. The no-load loss of S11 is between S9 and amorphous alloy transformers. In the future, S9, S11 and amorphous alloy transformers will exist at the same time, while S11 and amorphous alloy transformers will be the future long-term development. aims. Of course, due to the large number of transformer manufacturers in China that produce silicon steel sheets, the one-size-fits-all approach to the immediate suspension of production is also more difficult to predict.

From the perspective of reality, according to the incomplete statistics of 10Kv distribution transformers in the field of rural electricity, the number of S9 transformers is mostly, accounting for up to about 83%, and the proportion of S11-type distribution transformers is about 15%. SH15 amorphous alloy iron The proportion of core distribution transformers is only 1.2%. Therefore, it is expected that in the next stage of rural power grid transformation, amorphous alloy core distribution transformers have a large market space.

Technical threshold

Amorphous alloy distribution transformers have particularities in the manufacturing process, and their technical threshold is more difficult for general enterprises to grasp.

First, the quality of amorphous alloy strips is high. Amorphous alloy strip hardness is much larger than that of silicon steel sheet, and the thickness is very thin, which brings inconvenience to cutting and processing. In addition, since the degree of magnetostriction of the amorphous alloy is about 10% higher than that of the silicon steel sheet, the noise of the amorphous alloy core transformer will increase, and annealing treatment is required to reduce noise. The key point of annealing is to control the annealing temperature and time, otherwise it will lead to the crystallization of the strip; and the amorphous alloy material after annealing is fragile and very sensitive to mechanical stress, and it needs to adopt special tight Solid measures.

Second, the production process of cores for amorphous alloy distribution transformers is also more complicated. Through the cutting, punching, stacking, fixed molding, testing, magnetic field heat treatment, cooling, coating, re-testing and many other links. Among them, the magnetic field heat treatment belongs to the core technology, and the orientation of the magnetic domains by the magnetic field heat treatment device can only reduce the stress of the amorphous alloy ribbon, and finally reduce the loss.

Finally, when assembling the transformer, it is necessary to open the joint of the lower iron yoke of the iron core, sleeve the winding, and close the joint again. This opening and closing requires design level and skilled worker experience, otherwise it may cause the core gap to be too large, increase the magnetic resistance of the joints, and ultimately increase the no-load loss and transformer noise.