1、 The development trend of distribution transformer shall be:
1. low loss, especially low no-load loss; highlight the effect of energy saving.
2. low noise, especially no-load noise, shall be low; meet environmental protection requirements.
3. fully sealed to prevent transformer oil from contacting with external air, and meet maintenance free requirements;
4. the protective device is installed in the oil tank, and miniaturized; the size of distribution transformer is reduced to facilitate the installation on site.
5. it can meet the power supply requirements of the ring network, and the low-voltage side can output multiple ways;
6. no exposed live parts, safe to use.
7. small volume, light weight, reliable operation, convenient maintenance and transformation.
8. it has superior fire prevention, anti-seismic and disaster prevention performance, and improves the application scope of the product.
9. have strong overload capacity to meet emergency needs in case of other equipment failure.
10. further reduce production cost and sales price, and accept it for more users.
According to the above analysis, the combination distribution transformer with amorphous core is the ideal development direction. In addition, the products suitable for domestic demand are S9 and S11 type power distribution transformers with energy saving. For places with fire protection requirements, epoxy resin can be used for dry distribution transformer.
2、 Some problems should be paid attention to in the use of distribution transformer:
With the above conclusions, combined with our working experience, it is not difficult to understand and get the attention in the use of distribution transformer. Here, only the requirements are discussed, and the argument is not carried out, and the discussion can be carried out in the future
1. When selecting distribution transformer, in addition to fully considering its performance, the capacity should be selected properly, and the load size should be fully considered to ensure the load utilization rate; the capacity selection is too large, besides the high purchase price and large one-time investment, the inherent no-load loss is also large in the operation process. The capacity selection is too small to meet the requirements of power consumption, and the load loss is often high.
2、 Reasonably determine the number of units to be used, which is generally considered from safety and economy; there are a lot of primary load or secondary load but need to be set from the security point of view. In case of large load fluctuation and long interval, one large and one small combination can be considered; when the power supply reliability requirements are high, standby transformer shall be considered, of course, there are various factors such as site and other factors influence. When power and lighting share one transformer, which seriously affects the life of bulb or lighting quality, special lighting transformer shall be set.
3、 The economic operation of transformer is a complex systematic problem. When the no-load loss of transformer is equal to the load loss, the efficiency of transformer is the highest, which is difficult to achieve in practice; in the operation of transformer, the economic operation curve and the best economic operation curve should be considered. Generally, the load rate of transformer is 45% - 75% and the efficiency is relatively high, and it is relatively economical in all aspects; But different transformers of different capacity and type are different, which need to be distinguished. It can be calculated and judged by referring to Professor Hu Jingsheng's economic operation of transformers.
4. Pay attention to the reactive power compensation of distribution transformer; neither over compensation nor undercompensation is allowed. Generally, the actual power factor of distribution transformer shall be more than 90%, and the loss caused by its own shall be considered for the input of capacitor. Through reasonable compensation, enterprises can obtain considerable power saving benefits, which should be paid attention to; one is to improve power factor through compensation; the other is to reduce line loss; third, to improve the operating voltage,. Group compensation, centralized compensation, local compensation.
5. The secondary output voltage should be paid attention to in selecting and using transformer. The system voltage should be fully considered, and the appropriate voltage ratio and tap changer should be selected to meet the requirements of the customer for voltage quality.
6. To strengthen the operation and maintenance of distribution transformer, the current system adopts the state maintenance method of no defects and maintenance of distribution equipment. However, the inspection contents should be scientific, such as: it can not be overloaded for a long time, the oil level is moderate, the temperature indication is normal, the noise is qualified, etc., which has been specified in quite detail.
7. There are many problems in the use of distribution transformer, such as safety, civilized production, service life, investment benefit recovery, installation location selection, etc., so we will not discuss them one by one.
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